DYNO DAY!
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- เผยแพร่เมื่อ 16 มิ.ย. 2019
- We did a comparison on a stock Jeep Cherokee XJ 4.0L with OEM injectors, 4port upgrades, and the 12port upgrade injectors.
Very pleased with the results on how everything turned out!
Note that this is a stock system, minus the fact that we have deleted the coil rail, and added in our cyclone electric fan system, so no fan clutch. Otherwise, everything else is bone stock.
Let us know what you think!
Thanks! Just bought a set of 12 ports from you for my ‘01 XJ, installing them soon.
got some 4 hole K's from Yall in October. what a great way to fall back in love with your junk.. 👍👍🍻 geat product 285k 16.5mpg 35s welded 410 gear
Thank you for telling me exactly what I was looking for ! No bullshit just facts!
Exactly!
That’s pretty good. Parasitic loss through the T case and front driveshaft spinning is 25%. That means that 240k engine is still putting out close to 190hp.
We were doing the math and it was pretty close. These 4.0’s definitely hold through time!
The 4.0 may not be a power house or state of the art, but they are a really good motor.
yep for a 4x4 its about 21-22 % power lost to the wheel
25% is a pretty extreme loss even for a 4x4 truck. And the lack of a clutch fan is a pretty significant gain. That motor is just getting tired lol
@@headlesnorseman701 clutch fan isnt engaged at wot iirc
You guys are awesome, the greatest vendor ever😉
Thanks bro! Can’t wait for my cyclone set up ;)
You ROCK, Raffi!!!
I grew up on a farm on the corner of Middleton and Linden and now live in AZ. Just starting rebuilding my 94 Jeep 4.0. I have a long way to go but it has been good fun. Wanting to do a stroker and lift kit soon.
I did the 4 hole. Before the installation the engine had a little more vibration. The 4 hole installed smooth it out.
Great job bud. Thank you.
Great video
Dude i live in the boise area and have an XJ with 231k miles on it. Thanks for the video!
Dont see many dyno sheets that are below 5252 rpm haha, nice job!
Hey another great video! 👍🏻 Haven't been well enough to install your 12 hole yet (or your wife... LMAO over my own typo letting it stand.. ha WIRE upgrade), but looks like worth the time. 🤙🏻
PS: Still waiting to add your pending front and rear winch wiring to my build backlog bucket list.
Finally some science not just owner guess work.
Wow!
for my TJ the engine has BBK 62 mm throttle body, K's viper coil mod, K's 12 port Fuel injectors, and a custom cowl cold air intake, on the dyno with 35 in tires and 410 gears i got 200 HP and 200 FT Lbs tor. Thanks K Suspension!!!
Sounds like a nice build! 💪
Not a bad little bump for the price....
Outstanding Job Guys, I found you all a couple of days ago looking for a how-to-video to change out my Injectors... I have a 93 jeep ZJ 4.0 automatic, and I want to put in the 4-hole injectors.. From watching the videos I Know I can do this.. Iv'e change out pretty much everything , but of cource so much still to do ... I Love my little Jeep , so fun to drive & I want to do some long road haul's in it to see the country & just kick back... Anyway , I need to order my Injectors from you-all ... I did Subscribe & I'm so glad I found you folks... Danny .
Thank you for your support! And good luck with your build!
I'm curious to see how much of an increase in power will be netted combining these with other bolt ons. I have the 12 ports combined with a BBK 62mm TB, banks manifold and banks cat back exhaust with a "custom" catalytic converter.... Hmmm
I'm probably 6 hours south of you ( depending on what I'm driving) I'm really impressed and surprised at the actual results. I have a ton of family in Rexburg. You have gone from fanatic to entrepreneur. You make things look easy. If you can come up with something that's easier than "painless wiring" for a RENIX system....I have 2. I'll buy 4
Aaron Hansen appreciate the kind words and your support. Truly means a lot
@@KSuspension (I can hit salt lake in 2
Aaron i found a place that can rebuild/repair your Renix engine harness. they are a professional shop that deals in wiring harnesses. hit me up and i ll pas their contact info along. i am also in renix engine harness hell. grrrr
In my experience in normal driving it has plenty of acceleration!
It’s definitely no good for racing but the acceleration is not bad!
I want to see you do a tri Y header evaluation. Test on the dyno the difference in stock manifold versus tri Y header. Also my Jeep is a 98’ and has the original intake manifold and I’m really interested in knowing if the later model big plenum intake would make more power and torque.
that was actually done already, there's a thread online that shows the results. It's not a gain at all.
www.fourwheeler.com/how-to/engine/154-0911-jeep-4-liter-engine-myth-busting-true-lies/
@@KSuspension thanks...you just saved me a lot of time and money
Between each run did you do a learn mode reset ? The only way to see real gains is to do a ecm reset then after about 50 cold start the ecm learns the new injectors and adjust accordingly through those 50 cold starts only then can this graphing show true curves.
Hey man I'm out in Nampa as well! I have a 96 xj I've been working on
sweet! Love to find other locals!
I’m right here in nampa too! What’s your ig?
Good stuff. I have the 12 holes and your Viper Mod kit. But while you were at the dyno, why didn't you test all the other "power upgrades" e.g. spacer, hot coil/spark plug gapping, performance plug-ins etc.
Was just going between different injector types. Wasn’t a test for anything else at this time
cool video. I didnt expect to see the 4 port have a higher torque number. It looked like it stayed about 10fp above the 12 hole most of the run. I mean i'll hand you 4 or 5 hp for 10 fp of torque. not that you could notice any of it much really. I understand the 12 hole does better on fuel economy if the internet is to be believed. I wander how much a new set of stock injectors would change the whole thing? I guess its all marginal gains but I get the cold air ignition coil programmer injector and exhaust upgrade. Past that v8 swap I guess.
@hockeynerd7 why
I am very interested in the 12 hole injectors and as other people have commented about resetting the ECU between test and lower RPM for the street driving fuel economy would be interesting.(mine is a Wj 4.7L). And any proof of better atomisation.
We have them on our webiste, currently there is a slight backorder however.
We also have a injector comparison video on our channel you can watch to see the differences in the flow and atomization
i been seeing some crap said about your injectors. glad to see this. now many times bolt on junk nets 0 or a loss of HP. granted an easy 5 hp and more torque is always good, and your 30 year old injectors will make it run not so great. so all in all, i say these injectors are a good idea to upgrade with. now, what about for my Renix? :)
We have some awesome units that are plug n play for your Renix motor :-)
@@KSuspension i am contemplating an engine harness rebuild by a professional harness rebuild/repair shop and a new engine. but i need to get my old junk all working first before the engine. dont want to be fighting harness issues and sorting out a new engine. mine is 100 percent bone stock 88 with 4.0 and AW4. maybe i need to dyno my 250 K engine with wiring issues, and then with pro repairs on the engine harness. then old engine with original injectors, then new engine with old injectors and then your injectors. could showcase the harness shop, and the dyno shop, and the injectors you sell.
The Death Wobble Channel that’d be pretty awesome to see
Proof is in the pudding 🍮 😋
Hey Raffi I just changed my injectors in my 1998 ZJ 4.0 and I'm still getting getting a hesitation in the test drive its much better than before but can you give me some information on what I may need to replace. Eric
clean up your throttle body..... and make sure your EGR, idle air control valve, and throttle possition sensor are working correctly
id almost say dirty throttle body and a bad throttle position sensor
.
if you have a OBD2 scan tool.... look at the "live data"..... press SLOWLY on the gas pedal
it should start at 0% (some cars start at like 3 to 6%) and go to 100% smoothly
.
you want a stead increase..... 5 10 15 20 25 ETC
if its going 5 15 25 10 25 30..... then your sensor is bad
Was the cold air intake test done with stock injectors
It shows on the sheet that it was with the 12 holer's.
jsut changing the inyector nothign else? ECU can tune itself just with sensors information? ,if thats the case the 4 port looks better
only changed injectors.
What does it cost to get a dino anyway
Interesting data but its very subjective. Just came from a video where someone claimed according to this video, “12 hole are better for high end torque while 4 hole are better for low end torque”
These claims are from people trying to learn about their modifications but don’t have the base knowledge to take away the right information from a test like this. They just see graphs and data and take what they will based off of what they know.
For any body else reading pleasing take these results with a grain of salt. There is many factors that go into dyno results. There is even different dynos that show different results and can even be manipulated.
If you wanted to find the real difference in these injectors this needs to be a lot more in depth and science based.
Im not trying to hate on anyone, just don’t like hearing misinformation spread by people who don’t exactly know what they’re talking about from a video they see that does limited testing.
Besides that this was a good video on what your personal injector results were, love to see how 4.0s do on a dyno👍
I installed the 12 hole injectors. But now I have still hard rumble coming from the engine at idle and when driving it struggles. Is there anything I can do too make this change?
Feel free to shoot us an email and we’ll try and help you out. Suspensionlifts@gmail.com
can u guys recommend what kind of 4 hole is the best for performance with good price ? for jeep 4.0 YJ
our standard 4port upgrade will work perfectly!
Where did you get your 4 hole injectors from are they Bosch how much do they cost where do I buy them thank you
We supply them, www.ksuspensionfab.com
Bosch units, lifetime warranty
Which 4 port injectors did you use?
Our Ford 4port injectors.
Question Guys, i used the ford 4ports on my 2001 WJ GC 4.0 and just curious if you think any modification to that airbox design could give more power and torque or is that factory setup already pretty optimized for stock engine hardware and just a free flowing exhaust. Pre cats deleted and main cat replaced with high flow and a glass pack resonator only.
The biggest upgrade you can do with the intake is getting rid of the ribbed intake tube.
Changing that or going true CAI has the best benefits for the engine.
@@KSuspension thanks for your reply, i can probably get an intake tube to replace the intake silencer / plenum but the air box has that silly oval ribbed coupler and idk what to do with that.
@@KSuspension a second question, do you think throttle body spacers do anything at all?
@@JFabrication they're excellent door stoppers and paperweights!
It would have been more interesting to compare New OEM stock injectors with New 4 ports injectors, when comparing old and used injectors to new injector, it is always without surprise, new injectors always give better results
All injectors were rebuilt, it was a fair test across the board. New or rebuilt, results would be the same.
@@KSuspension Thanks, ok sorry I didn't catch OEM where rebuilt !
What pound were the injectors between the 3
stock, 19# 4port, 24# 12port
12 port? where? and do they work in a 98 XJ?
Www.Ksuspensionfab.Com
Yes
You have should have pulled your fuel trims out of the computer and run the dyno with a wide band. The ecu needs some time to reset the tables. If you run it at WOT it defaults to the last known tables, which the ecu would have developed for the factory injectors. I’m willing to bet a significant amount of money it was running extremely rich at the top end
Yea the fuel trims at WOT were horrible for a 3 sets as you can see on the AFR graphs. Richer and richer all the way 10:1 at redline. Too bad we can't reflash these things with better fuel trims because there's another 10-20hp right there just waiting to be unlocked.
@@v12alpine I'm aware this comment is a year old but:
if we can't change the trims, what if we went the other way and did more airflow mods in the place of fueling trim, ie. A home port job, port matched intake, headers, exhaust etc.
@@klampykixx Everything helps. Good news is HPtuners supports 96+ XJ's now. I just tuned mine. Gains weren't incredible (8hp / 15tq) but I'm not sure how agressive the tune is, haven't had a chance to talk to the guy yet.
So much potential with these 4.0 and yet no one has modified the fuck out of these 4.0's put a ported head with bigger pistons and a 4.2 crankshaft and custom headers and intake and you're talking about 400 to the wheel and modified trans talking low 14 or high 13's
I've....seen some pretty rowdy ones.
Checkout Newcomer Racing.
Uhm.. HP 147??? Me jeep XJ Stock 1992 4.0L 6l - 193 HP and 224 Torque.. Uhmmm...
You are confusing engine HP vs HP at the wheels. You will lose power by the time all the force reaches the ground.
The 12 port injectors pose a good upgrade. A good comparison would be to test after a few cycles and see if the computer “learned” the injectors and change the timing and firing, etc.
Thank you for sharing and thank you for all of the great parts and offerings.