GM TBI to Carburetor Swap PT. 4- The start up!
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- เผยแพร่เมื่อ 7 ต.ค. 2024
- Part 2
(X2) 90 degree: Fuel Hose Fitting 3/8”- www.jegs.com/i...
Straight Fuel Hose Fitting 3/8”- www.jegs.com/i...
(Feed) Universal Fuel hose 3/8” x 10ft- www.jegs.com/i...
(Return) Universal Fuel hose 5/16” x 10ft- www.jegs.com/i...
Holley 12-803BP Fuel Pressure regulator- www.summitraci...
Fuel pressure gauge- www.autozone.c...
3/8” female pipe thread T fitting- www.lowes.com/...
3/8” male to 1/8” female adapter- www.lowes.com/...
3/8” Close Male nipple fitting- www.lowes.com/...
Thread tape- www.lowes.com/...
Hose clamps- www.lowes.com/...
Hose cutter- www.harborfrei...
Part 3:
HEI distributor: www.jegs.com/i...
Part 4:
Edelbrock 600 Performer: www.summitraci...
Choke cable: shop.advanceau...
Airbox: shop.advanceau...
Throttle cable bracket: www.autozone.c...
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Carb swapping a friend's tbi and your videos helped answer a few questions so thanks. In my experience using those multipurpose stripper/cutters I've found if you turn them over when stripping so that the flat face of the stripper is towards the end of the wire they bite/strip better and easier versus the way you used them. I've had a few different brands which definitely matters but I will say that a dedicated stripper is also worth the money and then use the multi stripper strictly for crimping. Thanks again for the videos and info
this is the best iv seen yet
Thank you! I tried to make this little series as detailed as possible.
You did a good job
Thank you!
Got lucky and didn’t have to set the timing or the idle mixture? In 40 years of turning wrenches I’ve never heard of that.
Yep not much tuning at all, timing was dead on and that carburetor came out of the box ready to run, and it runs great! Have had to make some slight adjustments here after a few years of running it but nothing major.
🤯🤯🤯 I was very close too buying a expensive intake manifold , because the tbi has those funky odd angle middle mounts. I've watched a few ideas on converting a tbi too carb and you.are.the first too simple drill out the tbi mount too except a 4 barrel carb. You just saved me alot of time and money . God bless! But what exactly bit did you use too drill out the holes for the secondary of the carb?
I measured my carb holes and bought a hole saw just a tad bigger so there was space for the flaps to open, nothing too scientific honestly lol, just kinda did what seemed right. After I drilled the holes I just widened them out a little bit as needed with a die grinder.
I believe I used maybe 1 1/4 inch hole saw and then used the die grinder to widen out the holes as needed.
@@nickconnors8515Great and very informative videos. Did you remove the intake manifold when you drilled out those extra holes for the carb? If not, how did you prevent metal shavings falling in the intake when you drilled out those holes for the carb? I am about to do the same on my SBC with at TBI. If I can use the original intake manifold it would save me a lot of money and a lot of trouble fitting in a new carb intake manifold. By the way, how did you prevent vapor lock on the carb using the original carb? Thanks.
Can't do it with a stock intake like he did his. That Holley tbi intake he has was basically a blanked off square bore that was opened up for a tbi that's why it was so easy to do with what he already had. You could find any used SBC intake to fit hell even a cast iron Q jet intake will as long as the center bolt holes are wallowed out a bit until they line up with the tbi head holes.
But currently they have made it even easier there's a few companies that are making adapters that can bolt a carb straight to the factory tbi intake gottem for 2 and 4bbl carbs.
Im at the point I figured may as well ditch the tbi been chasing electrical issues causing a intermittent idle hiccup on one of my trucks for awhile now and it's always sucked on mpg no matter how good it ran just picked up a older but fairly clean 500 Holley 2bbl for free. $50 for a rebuild kit and $40 for a American made carb to tbi adapter on eBay then the Holley 6psi return style regular is $70 bucks I'm planning on mounting the regulator under the driver's side frame rail and tying right into the hard lines for the supply and return that way I only have to run a single 3/8 line from the back of the firewall up to the carburetor. I already have an older hei distributor and possibly enough stuff to figure out the throttle cable and kick down but possibly will need an aftermarket bracket . Once I get all my stuff together I think I could knock it out on a Saturday
great video very informative and to the point. where did you get the adapter plate for the tbi to carb?
I am not sure, the intake was drilled for a carburetor, I had to modify the ports in it on top for my 4 barrel carb. Not sure if it can be bought or it was custom made at some point in its life. It was drilled and tapped for TBI and Carburetor.
What wires did you run to the hei distributor to power it also what wires to power the fuel pump to keep it running
I didn’t have to wire anything for the fuel pump. Also for the distributor it took the 12 volt power source and a tachometer signal.
im planning to do this on my 87. Pretty sure its 700r4. So no need for extra wiring 😅 but its also a 454. 🙂 i was wondering if i can get a breakdown of parts you used. Ill likely need similar stuff. Except i shouldnt need the tps stuff. Thanks.
also ill be swapping the intake cuz im fairly sure mine is tbi specific. So that sucks. Lol
Everything I personally used should be linked in the description. I didn’t have to change my intake so that will be missing. Good luck with the swap! I definitely think it’s worth it.
What wire did you run to your hei ???
I ran the 12 volt power and a tachometer signal to it.
All these videos talk about 700r or 4l60 what about the th350 I’m assuming it’s the same as 700r since I have a kickdown cable but can’t find anything proving that
I’m not exactly sure, I know the 700r didn’t need as much electronics as the 4l60 so it was easier for the swap. I assume the 350 is very similar to the 700r
Got a sbc 305 doing the tbi to carb too but what do you do with the iac idle air control plug?
With the carburetor the sensor isn’t needed so I simply tied all the unused harnesses together and tucked them out of the way.
Appreciate ya
What size/cfm carburetor did you end up going with?
I went with the edelbrock 600cfm performer carb. I believe the number was 1405
Hey man quick question. Do I have to do anything with the wiring that were at the fuel injectors?? Thank you
No I didn’t have too
So how does it run? Spit and sputter at all? More power? Burnouts? What’s your fuel pressure?
I’m considering on my 89. Has easier 700R4.
Thanks
With the carburetor much better! I average around 11-13 mpg in the winter and during summer 14-15 with normal driving. Definitely also increased the horsepower, nothing super crazy but she does good burnouts and definitely has some pep in the step. I will say doing the carb swap really brought a lot of life back to the truck. Once I got it all tuned up and got the timing in the right spot and got my tranny working right, what a different rig. I would highly recommend if you’re having issues with the TBI unit, switch it to carburetor.
@@nickconnors8515 can u help me find the website for the throttle position sensor please it’s the last thing I need and my truck will be up and running you videos helped me out so damn much
@@romeoweeks2702 here is the link! I’m glad I was able to help. www.usshift.com/tps.shtml?gclid=Cj0KCQjwk7ugBhDIARIsAGuvgPZvnTEwpYwWAiIdhOoA0_TUz_5sPcCOkSofdsPDAiuq4lHybOI948waAiBREALw_wcB
Running advance on manifold vaccume? How's that working out for ya. I can't find a straight answer on this back and for ported or manifold
Advanced timing? If that’s what you’re referring too, it works great, this truck loves about 12 degrees of advanced. As for the rest of the system, everything else also has worked great with very very few issues.
@@nickconnors8515 "timing" is correct. I've got mine on manifold as well. Rpms def lower at idle but so is my oil pressure. If your dont mind me asking what is your oil pressure at. or what does a older 350sbc usually run at. I've been anywhere between 20 and 80. After warms up though its in the 20s at idle. Thanks for getting back with me earlier.
@brandonbaker8584 that’s exactly what mines runs at, around 80 cold, settled around 40 at 2k RPM then idle is a little less than 20.
@@nickconnors8515 appreciate you sir. Thanks for the help 🙂 👍
@@brandonbaker8584 no problem!!
So did you get rid of the egr and all related sensors?
Yes sir, only sensors I have now are for the transmission, all the engine control sensors are not being used, I left them all in their place along with the wiring, but since I have the carburetor they’re not in use.
What's the throttle position sensor transfer deal you're talking about? I'm doing the same on a 91 s10 4.3. it runs and drives but it cuts out when warmed up. I'm curious about the adapter
I had to go buy a throttle position adapter kit for my carburetor so my electronic transmission would still shift. It wasn’t cheap but it works great and I haven’t had any issues.
@@nickconnors8515 thanks dude. I'm still waiting on my distributor to come in from eBay. I got basically everything else. I appreciate you taking the time out to not only reply but also put out these videos. Helping a crap ton of people
Is the map sensor still needed
I do not believe so, should only need throttle position sensor, vehicle speed sensor, an RPM signal, and I read somewhere apparently coolant temp so I left mine in just Incase.
I did this swap and my fuel pump will not stay on ??? Any ideas
What year of truck do you have?
How did you do the throttle linkage? You said you couldn’t use it so I’m wondering what you did
I was able to find a little kit off of autozone, I believe it was an edelbrock product or an autozone brand
update, I did the swap. So far so good I’m just waiting for the TPS kit in the mail. Your videos are very close to what I had to do.
It took me a little while to find the RPM test lead to use for the tach
I would get a fuel pressure regulator that has a fitting for a gauge built in instead of using the T (don’t over torque fittings, I cracked my first regulator)
Rtv the areas around the coolant ports if switching intakes on the head, both sides of the gasket, and the intake. Mine leaked twice until I did that.
0° initial timing with a carb motor is not enough, my truck ran rough but I also have a slightly larger camshaft that you can’t hear.
If you want to use the PCV pipe from the driver side manifold you can break a couple tabs on the inside of the factory air filter spacer and it fits on top of the carb perfect. All you have to do is go to ace for a longer stud and cut it to length.
I DEFINITELY recommend putting the vacuum advance thing on the drivers side of the carb and not where you put it. I didn’t have enough room to advance or retard even when moving plug wires over one post.
Oh I see good to know, I was able to time mine with the vacuum port on the passenger side but definitely something to consider.
did you do anything for the map sensor?
I did not have to do anything with it, since I got the carburetor the only thing the computer has to do now is shift my transmission. For the transmission the computer only looks at TPS, vehicle speed, rpm signal, and someone mentioned coolant temp so I left all that intact and it’s been running great.
What did you use to drill the holes on the intake ???
I used a hole saw and a die grinder to smooth the edges
Where do I get that sensor I’m trying to find the website someone help
Here is the link! Hope it helps www.usshift.com/tps.shtml
@@nickconnors8515 hey sorry I keep bugging you I found out I need to put a vacuum line for my fuel pump because that’s what keeps getting shut off just wondering I’m going back watching your videos I don’t know if u did that or ran into that problem
It’s like getting back pressure and shutting my pump off did u do anything for the big tank in the front clip?
I’m not sure about a vacuum line, did you use a return style regulator for fuel pressure?
@@nickconnors8515 yes sir I did and what pressure did u put on the regulator it might be that I might have it to low