S3 E16. The Kubota turbo diesel Saturn delivers mind bending fuel economy once again
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- เผยแพร่เมื่อ 29 ก.ย. 2024
- Season 3 Episode 16. Jimbo takes the Kubota turbo diesel Saturn on another fuel economy run and discovers hidden MPG. Later in the video Jimbo modifies the Saturn transmission in an effort to improve the fuel economy. Tune in and check it out!
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I did suggest this a while ago but worth repeating - you could improve the flow through the exhaust housing by tidying up the casting. These Chinese turbos are rough inside and restrictive compared to the IHI originals. This will produce boost earlier and help lower the exhaust temperature.
Here's a link to a how-to video which gave impressive results on the same turbo entitled:
"Ninja 500R turbo VZ21 More exhaust housing modifications":
youtu.b/HPBPJIInciw
Improve flow by heat wrapping the turbo and exhaust.
Some minor head and port work would do a lot as well I think
These CHEAP turbos are rough inside and restrictive compared to the IHI originals.
The point being in the 1950's - 60's anything made in Japan was cheap junk, that changed, however Japan still makes cheap junk depending on what you buy. Same as China, its what you buy.
@@fastinradfordablei had the same thought, also less heat emitted to the intake system.
he also needs to build a bell mouth style downpipe for the turbo, the one he has there now is very restrictive
Hi, as someone who’s spends his days fixing kubota engines and the things they are meant to power this is brilliant content
Thanks again
I knew that the taller gears wouldn't help. We had an '81 VW Rabbit diesel pickup that came with a 5-speed overdrive trans. A couple of our friends had already bought their Rabbit pickups with the standard 4-speed trans, and were getting over 50MPG (52-53, if I remember correctly). We thought that the 5-speed would get us even higher mileage, but it averaged around 45 MPG, as the little 1.6 liter diesel (no turbo) just didn't have enough oomph to run economically in 5th gear.
OK, the lawn mowing outro did it. I thought I'd mention Thunderhead 289. He grafted a lawn mower carburettor on to a Ford 302 and got some pretty insane mileage out of a Maverick. Not nearly as good as yours but still pretty impressive for speeds up to 75 MPH.
th-cam.com/video/FwhMz2kR4pw/w-d-xo.html
Some videos back, probably last year around this time, he addresses the very video you posted. Interesting stuff! 😁
Your lawn is like a 40 years old head. Not bald yet but not plenty of hair left.
I almost spit my drink seeing your Saturn "Crew Cab" 😂
I just drove a New golf from Hamburg Germany to Saint-Nazaire France. About 840 miles (14 hours). It was fully loaded with equipment and i didn't try to drive slow. It managed 4.5 litres per 100km. 52 mpg. Total comfort, air con on all the time.
I was pretty shocked tbh. I appreciate the work you're doing.
I don't go to church on Sunday, I ring the bell on robotcantina's channel 😃
My 2017 Subaru Impreza had a dipstick and fill hole on top of the manual transmission, it’s a bit tricky to get to bc you have to remove the intake boot but it’s still accessible without picking up the car 😂
The lower ratio 5th gear would probably work at 80mph but definitely under powered to push it there.
I know of a car that also has a dipstick on the manual transmission, the Subaru Forester diesel 6 speed manual, not available in the US though. Excellent fuel consumption also, especially when driven accordingly
I believe the early Subaru justy had a dipstick with the standard transmission
It seems like 4th gear on the mp2 might be the perfect gear to replace 5th on the mp3 box.
45psi, holy shit batman
You may have to make some concessions if you want to run the taller overdrive. EGTs: the Cummins guys consider EGTs of 1000 or more to be normal and your are going to have to go faster to take advantage of that tall gear
Dang, wonder if this motor setup would propell something like a old Ford falcon. They are pretty light units.
You've achieved in your backyard what VW did with the Lupo 3L and you did it with heavier car with indirect injection industrial diesel, great job!
Not to mention with only 1 (maybe 2) guys vs a whole engineering team.
Um the 3cyl polo has the record as a production car making 95mpg
And then polo actually set the record of *not dropping below highway speed limit.
The lupo also accelerates to 62mph in ~14 seconds
I had a 1.9 TDI that could do 2.9L/100km if you wanted. Averaged around 5.5. Wasn't too slow either.
I'm noticing a worrying lack of burnouts on this channel.
I'm burned out. Does that count?
@@katieandkevinsears7724yes
This is the channel where there isn't even enough power to chirp the tires over some slick paint... 😂
@@volvo09 black ice is about the only chance to spin the tires on these cars
It probably would destroy the motor to do that. Not to mention that it sounds like a tractor.
While the experiments might seem dumb at first glance, I've learned a bunch of stuff watching this series. Don't focus on the negative comments too much. Looking forward to the next video.
I like to think he's inspired at least 3-4 people to throw a Kubota in a Saturn.
Makes me smile.
Strangely been thinking about it for years. Been looking at my 9n tractor with that in mind as well. America needs a light diesel option with a manual transmission. Saturn is likely the last quality (for small american cars) option with that viability. I just wish those 3 cylinder diesels weren't a billion dollars. What I really want to do is mesh an electric motor with this diesel engine and proper regen brakes. It works for the train industry...and I'd love to toss this in an S10 or ranger. I think it would resolve the slow starts and improve mileage, obviously.
next episode. we are going to build a compound turbo setup for the kubota diesel saturn so it makes 100 psi boost and gets 75 mpgs.
Perfect. Next time try to make the fuel REPRODUCE in the tank, and obtain negative MPG
This isn't "stupid stuff", this is really good empirical data you're accumulating! Looks like the Kubota wasn't getting high enough on the torque curve with the taller 5th gear set.
You're right it's not stupid stuff,it's a process of trial and error cause that's how we make progress
I once hear the saying the difference between "during stupid shit" and science is written down that happens 😅
Not enough exhaust gas to spin up the turbo.
At highway speeds 75 it would be good u think?
@@Jayf1981 probably, yeah. The issue is getting to 75 before excessive egt’s melt something. A small dry shot of nitrous would fix that problem, but I think that’s beyond the scope of this project.
Subaru has dipsticks on manuals sometimes. Put a new 5spd in a 13 WRX and it had a dipstick for the trans. Plus a lot of the older autos have separate dipsticks for the trans and front diff.
Subaru was doing it at least as far back as the EA-81 era. I had three Brats at various times (an '85, an '86, and another '85), and all three of them had dipsticks on their 4-speed manual transmissions.
One of them did get a 5-speed transplant from (IIRC) an RX Turbo. Can't remember for sure if it had the dipstick; I want to say that it did, but I'm just not 100% certain.
My '95 Impreza Wagon with the 5 Speed manual also got one!
You need a new thermostat. Poor fuel economy and power can come from never reaching normal operating temperature.
Came here to say this
That would make sense because somewhere in the era of that Saturn manufacture General Motors bought a significant share of Subaru to gain access to their AWD technology so it's very possible that they were sharing engineers or at least design specifications during this time
I have to speak for the masses and we want to see more questionable modifications 🤣
Like nitrous oxide
@@jamesringler987 We like Kubota engines we don't want to destroy it lol.
Just out of curiosity take the 4th gear of the MP2 and put it in the 5th gear of the MP3 transmission.
I suspect that the economic rev range is higher than what you may expect.
Another great video. Always get a like from me 👍
0 to 60 in 26.7 seconds 🏎... supercar.
Well here you go th-cam.com/video/E8m9Z010pM4/w-d-xo.html
Try the 4th gear off the donor trans, if it'll swap over. Maybe it'll kick the RPM up just enough to get some mild boost under load at highway speed and drop those EGT's.
I think he did it on 5th gear because it's so damn easy to do. I suspect digging into the rest of the transmission is out of his interest, and a whole lot more complicated.
@Marcus Damberger I think so too, but that ratio would likely be much better.
The 4th gear in the donor isnt even an over drive.
You really should use the 0.861:1 gear set for 5th with the diesel. It would allow you to get up on boost in 5th and control your egt.
Came here to say this.
@@Cowboy.underwater This will lower the fuel milage for sure. the problem is that you are too severely underpowered, amd the turbo- the smallest in the world- cannot develop good boost down at 1600 - 1800 Rpm where you will see exponential increases in diesel fuel mileage. an ideal solution, if you can score the 4 cyl. 1105cc Kubota diesel, would be to transfer your turbo and intercooler set up to them and use the tallet gearset. It would be happy and relaxed cruising at 50- 55 mph as the engine has 60 more displacement and torque from the get go and with the turbo it would make some semi serious torque wher you want it, which is below 2000 RPMs. Tony Capana did this back in 1981 in Torrance Ca in 1981 with an old Mazda sedan that he modified with different Kubotas and he achieved 85 mpg cruising at 55, and 101 mpg at 50 mpg. He was running bald tires with 90 PSI, however, so the car must have ridden like hell. He also managed 74 mpg in a VW Beetle with a 1300 cc Kubota. His son, Lloyd, managed nearly 50 mpg in a '74 Camaro with a 3.3 liter Mitsubishi industrial diesel turboed to make 130 hp and 2.56 rear ends plus overdrive so he could cruise at 50 mph at 1200 RPM.
When I drove semis in the 1970s, we got 4.2 to 4.7 mpg. Now with engine improvements and aero improvements, drivers are averaging close to 7 mpg, an I know a guy with a 13 liter Volvo with turbo compunding who gets 8.2 mpg cruising at 63 mph! He is only turning 1175 RPM at that speed. That is nearly 1000 RPM slower than we did 45 years ago!
More gears!
@@bartlevenson7851 I understand want you are saying, and the history lesson is cool, but the point of this project was never fuel mileage, he says so himself in this video. The shorter gear in 5th would improve drivability.
Maybe supercharge or even twin charge ( turbo and supercharge ) the vehicle. Two different small superchargers are available. An AMR 300 and an AMR 500 ..Fuel economy will take a hit but boost will build quickly and the vehicle will have more low end boost and torque making it hopefully much more drivable.
Jimbo, since you asked: My manual transmission ‘99 Subaru Impreza has a dipstick on the transmission
The Lancia Beta had a dipstick on manual transmission, Moss gearbox on old Jaguar had them too.
When I was in High School our next door neighbor had a Lancia Beta coupe. I thought it was such a pretty car, blue w\brown leather interior. Never really knew the neighbor but one day I got up the courage and walked over and asked him about the car and if he had any interest in selling it. Nice guy. Said he wouldn't think of selling it to anyone that didn't have an Italian mechanic on speed dial. He said it was in the shop more than it was on the road. Still wish I purchased it.
@@lancecluster The Beta was pretty reliable especially if it had a garage to sleep in and oil was changed every 3500miles (don't expect the electric windows to work that why a crank was provided in the glovebox). Rust is not an issue if the car isn't parked under trees or driven in salt.
The Gamma was the real unreliable Lancia, chronic overheating, timing belt jumping tooth when steering at full lock, dimm headlights only getting 10v... the list is long.
@@jean-charlesweyland129 Thank you for bringing the memory back to me.
I assume the Citroën CX also had a dipstick since it shared its transmission with the Beta
I'd recommend reconnecting the exhaust to let it route behind the car, and disconnecting the muffler in the rear. That should keep the EGT's down and put the exhaust behind the car where it belongs.
Uh, just run a “stepped” tailpipe to the rear, e.g. 1 1/2 about two feet, then 1 5/8 for another two feet, then 1 3/4… 1 7/8…
I think a much larger diameter pipe would be good if they can make it fit. If they don't want to be too noisy, they may be able to fit a large muffler somewhere. Even carving some of the sheet metal like the floor of the trunk may be in order.
Looks like the .861 4th gear is a prime candidate to become the 5th gear over-drive in the diesel Saturn.
I like the estate Saturn could you make some videos on that please?
USE LOWER PROFILE TIRES TO BRING OVERDRIVE RATIO BACK DOWN WHILE 1 - 4 WILL MATCH YOUR POWER CURVE BETTER. TRY 2 MINI SPARES AS AN EXPERIMENT. WHY ARN'T YOU MAKING BOOST?
You should do the same test in the .861 gear to see if you can improve it. Sometimes a higher RPM with less load is better MPG. (your current test proved this already)
Would switching to four "space saver" compact spare tires noticably reduce rolling resistance?
With such a small contact patch, comparatively, I'm sure it would significantly reduce rolling resistance
Questionable upgrades are my favourite type of upgrades!!!!
That was absolutely fascinating watching the fast motion of you cutting your dirt! 😄
The lawn looks great and great video as always!
Yes, yes...!! I'll have what I'm having! I never thought this day would happen😢. Finally eco mods. I definitely wanted to see how MPG can be squeezed out of this application. And then if possible trying to achieve the same goal but then making it mainly quiet & not smelling bad. Just to see how refined it can be. But excellent work 77 MPG that's crazy.
I think the next mod should be propane injection. Get this bad boy to sub 20 to 55
Oh, good GRIEF, Jimbo!
Put a cutting deck under that Saturn... don't use a walk-behind mower! It's 2023!!!
Honda crx Hf used to get like 55 mpg.. sure 62hp, but $$$$! That was 88-91
My dang truck gets 14.8
Just going to gas station I can see the gas gauge move :/
There is a type of wrap or "tape" that you can fold around your exhaust pipes which is used in racing, the idea being that the temperature inside the exhaust stays as stable as possible. ALso, if you ever consider building a economical kitcar then VW has some nice concepts, just like MG ( EX 181) - cool stuff!
Subaru have dipstick on their manual transmission. i have that on my 2000 Subaru Legacy with 5-speed manual
I’m not a mechanic but I thought of something.
Pulling the exhaust pipe lowered the exhaust temps at the SENSOR. Sorry for yelling.
Is there a chance the exhaust temp is unchanged inside the engine? Where I expect its more important?
I don’t think cool air is making its way back to the sensor but maybe a drop in pressure is causing a temperature drop? Or maybe the exhaust temps dropped everywhere. The motor would be working less hard with less restriction. Anyway I like the project. Best part of my Sunday morning.
Slightly lower gear ratio? Example switching a 3.08 ratio for a 3.23? Might help with take off performance, and solve the 5th gear issue? By putting the cruise rpm a little higher in the power band for the engine.
I have a 2016 2wd F150 with the 2.7 ecoboost v6. There is a hwy 62 miles around Atlanta. I circled this road @ 55 mph. I get 30 mpg. I go by refilling the tank.
I guess you could call it a “not Rod”. It is the antithesis of a hot Rod. But I absolutely love it.
Manual Subarus usually have dipsticks. Not sure about 2009 + . Definitely 95 thru 2009
Both of my Pontiacs (1986 Sunbird and 1987 6000 STE) had transmission dipsticks.
This car gets better gas mileage than my Prius, by the Prius is roughly 1000lb heavier.
When it was newer, my car could definitely reach similar mpg numbers (75ish) in a best case scenario but I'd need to "pulse and glide", running the engine in bursts and then rolling for a while with the engine off. Nowadays the car won't reach such numbers no matter what i do.
To be fair though, the total energy comtent per gallon in my fuel is lower, because it isn't a diesel.
Try to drill a hole/channel so the air intake can have more air. Also a sprinkler system on the intercooler helps cooling the turbo air, you can use the window sprayer for that effect, its as know technique here in Portugal that tunners use on projects.
Also i would recomend a smaller turbo so you can get more boost at lower rpm, i would recomend the old Garret 1444 used in Kia's diesel cars... in stock form, in the kias, it does 1.3 bars of pressure at 2000rpm.
Disguise the floorpan profile to make it flat and therefore more aerodynamic. The turbo seems to be too big for low rev boost says captain obvious. It is easy to cover the rear wheelarch with wrapping foil, close the WINDOWS!
I enjoy you channel because your goal is to have fun with cars and use "cheap" experiments to learn something. The nearly free gear swap is great example.
One thought when doing mileage tests is since you fuel tank is so small it might be quicker just to remove it and weigh it before and after the test to get amount of fuel used.
That exhaust manifold design drives me nuts. I guess it'd be ok in a stationary or farm use, but in a passenger car? 😬A good Y design would certainly lead to more efficiency and power.
I don’t like Saturns and not particularly interested in small diesel engines but found this interesting and fun. Nice job.
Saturns are great little tanks for a first car kinda driver.
Love the watching lawn mowing comment. Have to admit i was watching but judging your dirt patch. I dont think you can call it mowing when you have more dirt than grass. 😂 love the video, keep them coming.
I really enjoy your videos and look forward to seeing them. Id guess my 2010 Jetta Diesel was close to 50 MPG on the highway. What are the numbers on that? Is there an extreme cheat mode that would get better mileage?
Great video, Jimbo! Maybe a smaller turbo would allow it to spin up at cruising speeds, enabling the modified 5th gear to achieve better fuel economy. 👍
I agree. You may end up using the "waste gate" a lot more while getting up to speed but cruising is most of the drive.
Love those diesels. Growing up in Europe in the 70s, they had a few high mpg diesels made by VW, BMW and MB. Thanks for the great info and love the channel. Thanks 👍👍👍👍👍🍻🍻
Mercedes OM606
BMW and their 3.0 diesel
And VW 1.9TDi
And if I remember right the VW and Beemer got close to or over 50mpg in European form.
it's nice seeing someone take a radical opposite of most other vehicular content on YT, trying to push for greatest fuel efficiency instead of max power. It's refreshing
Also, thanks for metric units
That turbo is so far improperly sized for that engine its basically useless. You should be after something that will hold at least 20psi at cruising rpm/load. This is not a gas engine, that amount of boost is not going to blow things up, it might allow it to burn enough fuel to hurt something but thats only a problem if you give it that much fuel. It might be possible to get a lower a/r exhaust housing for that turbo or more restrictive turbine wheel, but it seems like its just intended for a much larger engine. As it sits 0 psi holding speed, its not doing anything for engine efficiency.
Why am I watching this? Because everything you produce is quality content including mowing the grass with some fun music
Subarus have trans dipstick on manual transmission
I'm a bit disappointed. Not about the video but about the car industry. If this guy can get his car too be this efficient with a home-brewed setup like this...
18:00 - Hahaha coz we iz! And why not? hahahahaha 😏👍
😎🇬🇧
Careful, rumor has it others who have discovered extreme fuel saving devices have come to an unfavorable demise. Just sayin. Anyway, thanks for sharing!
I have commented on it before but porting the exhaust housing of the turbo to match the size of the pipe coming from the exhaust manifold should help it pick up response and possibly get you a couple of PSI of boost while cruising.
This could also be helped by making a 2.5” down pipe that’s about 8-12” long coming out of the turbo to act as a expansion chamber for hot exhaust gas allowing the turbo to spool more rabidly as there would be a greater pressure differential across the exhaust turbine.
Turbo and manifold mods will likely happen, however after next weeks video we will be putting this car on the back burner and starting a new project. the good news is we will be testing an oversized down pipe in next weeks video.
@@robotcantina8957 A less restrictive 3 into 1 manifold with bigger bore tubing all the way back to the muffler... should help it breath and cool down the gas temps...
My 1987 Unimog 406 has a standard dip stick in manual 12 speed transmition 💪💪💪💪💪💪💪💪💪💪
Dude, use vw 1.9tdi, and add aerodynamic features to the car, lack of aerodynamics is a deal breaker
My old 2003 Subaru WRX had a dipstick for the manual gearbox
More boost at cruising speed will bring better economy.
my truck boosts 10-15psi at cruising 100kph and I see over 650c EGT daily
I feel something not right to only have 1 psi at 50mph it should be running more boost like 7psi at cruising
A vehicle is overdriven if max speed is achieved when engine rpm's are below max power rpm's. This is a definition.
I can't wait to see the gains that are hidden in the restrictive exhaust AND the turbo housing needing tending.
Get a set of wheel spacers for your front homes. They’re like 40 bucks for an inch of space.
After years of driving my honda CRZ, i realized i somehow get better fuel economy with my driver side window down and the AC off(AC off and window up is better) Odd that the AC would have that much affect, maybe i need a new compressor, or maybe it is over/under charged, feels like it blows cold air quickly, but that doesnt really mean there is nothing wrong.
About the best i can average per-tank is 55MPG(over 500 miles with about a gallon or less left on this 10 gallon tank)
for short streches i can go a few days where the car says its averaging over 70MPG but ultimately, i will have a few days where i am needing to drive more aggressively to make it somewhere on time, or make it to a light before it goes yellow bringing the average down.(edit, ialso dont really trust the MPG measurement and wonder if it is just starting high and getting more accurate with time, i mostly just use it as a quck gauge to make sure i'm not driving it too hard)
Oh, and in my area, getting this better fuel economy often means speeding, as this car likes about 52MPH but most of the speed limits are 45MPH if not on the highway or interstate which are both out of my way by a bit.
I think you get similar figures if you drive any modern small diesel with 2 or less liters at 80 km/h
My 99 subaru forester gt has a dip stick on its manual gear box. So handy
I would suggest after doing the exhaust and some other tweaking. Make a homemade water/methanol injection. That will basically kill any EGT issues and should make the overdrive work at low speeds with EGT control
What happened to the twin cylinder predator in the Honda video ?
Loving the videos from Canada 🇨🇦
When I was in college I had a little '84 Nissan diesel that got about 55 mpg at 60 mph with the stock engine. Fast forward 40 years and you really can't get significantly better mileage from a car. The EPA made it all about emissions and mileage has at best stayed the same. The EPA mileage estimate for that car was 45 mpg I think and a few years ago they tweaked the test and knocked about 1/3 off the ratings of all older cars to make it look like new cars are better but they really aren't.
i am not familiar at all with saturns but is it possible to take the 0.861 4th gear ratio out of the donor transmission and replace what with the 6th gear .730? I know it might be a lot of work not even sure if possible but i think that would be the perfect ratio for 5th for fuel economy and power.
The ideal ratio located at fourth gear cannot be harvested because 1st 2nd 3rd and 4th gear are part of the gear cluster and the gears cannot be separated. It would be an awesome ratio but its just not possible.
I would almost say use the 4gear ratio gear in 5th if you could .861
So what would be the true best car/engine set up for fuel mileage while still driving normal? I have have a 5 speed jetta Tdi getting 45-48 mpg which is great but can we do better?
Not knowing anything about Saturn MP2/MP3 transmissions, this may be a dumb question - but why didn't you use the MP2 4th gear as 5th in the MP3? Being closer in ratio to the MP3 4th gear would have raised RPM in 5th and allowed you to use it (theoretically).
4th is on the mainshaft inside the main part of the gearbox. It won't fit, plus it's mate is a permanent part of the countershaft.
how about individual exhaust pipes for each cylinder?
Holy-f that's a convenient transmission gear location!!! Sure wasn't expecting that! :) "crew cab" lol hahahah
why are we watching this... in hopes that there would be anything hidden at the end maybe? XD
Not stupid - very cool! I also own a rig with a Kubota swap, except mine is a 1948 Allis Chalmers Model G tractor with a 20hp Kubby diesel. Such an awesome upgrade over the original 11hp Allison gas engine!
When the saturn has to be scrapped you should maybe put the engine and trans into the renault and continue.
BMW Diesel cars and many others have a cooler in the fuel return line to cool the hot returning fuel down. Would that do any difference on the Kubota engine. Maybe measure the fuel temp, before the test and after.
Watched you mow because you got me hooked to that music .. 🤷♂😆
Any manual subaru also has a dipstick for the transmission. It also happens to be the dipstick for the front differential! Its in the left rear of the engine bay, amd on the turbo cars its right under the turbo
You keep saying that the Saturn accelerates faster than a vintage VW (slightly)... What vintage ? A 25hp, 36hp, 40hp, or a 64 hp, 1600cc? I daily a 1956 VW bug, with a 1600cc & I WILL smoke you! Race for pinks? lol😎
Woo hoo, the 5th gear tranny swap! A SaturnFans and Ecomodder exclusive. My mechanic did that for me back in 2007. That first day of driving the LA highways at 500 less RPM was GOLDEN.
The only problem is after maybe 200K miles, the tranny is whining when I go over 35 MPH. Current hypothesis is that the nuts came loose. But that's ok, still totally worth it for the fun I had.
That is an interesting method of mowing the grass at the end, I usually do it the opposite way and start by doing around the edge a couple of times to get a good space to turn the mower then up and down from one side to the other. It is interesting to see how differently people do it.
You'd hate how I mow mine then lol I have almost 9 acres and some of it gets mowed like a yard and some I kinda leave for a while longer, etc. There's all sorts of lengths of grass in my yard and different mow patterns. I don't even mow the same area the same way each time 😂
That might be the best method for maximizing mower fuel economy and pusher comfort
@@chapa435ify that's fair. I mow differently when it gets hotter on the parts I push, so honestly that would make sense. Also I live in Ar-kansas so it's the opposite of flat lol
The early 90's 3.4TDC (DOHC) GM engine in the lumina, grand prix, etc had a dipstick on the manual trans that was used only for that application -- the manual was dropped in the 93-94 range and only came with the electronic 4 speed automatic.
3.1 bar in tires is abnormal in EU. We are driving with around 2.0 up to 2.5 (based on a sticker located in car) bar tire pressure. I know that 14.7 psi = 1 bar so it's around 29.4psi for 2.0bar and 36.7psi for 2.5bar. I'm putting 3 bar into my moped!
Guys, if you dont use these car in trafic jams, lets install litle bit bigger engine. Many years Ago, my brother buy fo his wife, popular in europe some years ago - Opel Astra G Caravan, with GM 2.0 litre diesel motor. It wasnt brand new, but it has been in good condition. 2 litre x20dtl 82horsepower 180nm. direct injection using shitty vp44 pump and litle turbocharge garett gt1549 without intercooler. His wife drive just normal, little gently but usually 90km/h with a/c on. This car use 3,9litre /100km. I say my brother.. this isnt possible , but when you always check, how much they burn on the gas station, that was true.