Ultimate Modification on a Throttle Body Injection (TBI) for a Small Block Chevy, 1992 Chevy C1500.
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- čas přidán 25. 03. 2023
- Taking a TBI from a SBC and performing the recommended performance modifications from the internet. I added a 15 PSI spring to the fuel regulator, installed an ⅜” injector spacer, and removed the ridges around the intake for the throttle body. Increased air flow and fuel pressure is assured to HP for my truck. According to the internet there should be a gain of 47 HP with these mods. I don’t believe it but I'll go ahead and continue bad financial decisions and test it out.
A few weeks ago I found a small coolant leak around the intake of my Small Block Chevy 350. After ignoring it for a while then misdiagnosing it. I thought the intake gasket on my engine was leaking coolant. I ordered new intake gaskets, and they were back ordered for a while. While these parts were backordered I was allowed to ponder. I eventually ordered all the recommended parts to make a SBC TBI gain more HP. I took advice straight from the internet and ordered all the parts to make my engine run at peak performance. Let’s see if the mods actually do anything.
Love the Iowas State shirt with the black and gold shorts. Clearly you are a man of eclectic tastes!
My sister got her PhD at Iowa State, and I went to CU. I am basically a fashion icon.
hey also put a spacer between the TBI unit and the intake that really works about 1or 2 inch will do it
Yeah, I put one of those on a while back. I will reinstall it when I put everything back together.
Milled the air horn, rebuilt, and the cop car injectors, and custom chip, mentioned in other post.
If I need more I will use a big block Tbi and have another custome chip made.
Well I blew up this engine so I'm being basic and LS swapping it
great video man, where did ya get the 15lb spring?
Here's a 14: autosparty.com/throttle-body-shop-tbs-10320-gm-tbi-14-psi-yellow-fuel-pressure-spring/
The one I used, because I'm cheap:
ARU Fuel Pressure Regulator Spring Replacement for The TBS 10320 GM from 11-12psi to 14-15psi Fuel Pressure Fit for 2.8L 4.3L 5.0L 5.7L 7.4L TBI Motors Length 2" Outer Diameter 1" a.co/d/dy8RbJq
What is suppose to happen when you change that spring, My ambition is fuel economy, is that for fuel economy??@@crescenthammer
@Brian-gx7yx these TBIs are difficult to tune. The spring is a way to tune it. Bigger spring more fuel psi equals more fuel injected per injector pulse.
@@crescenthammerdid you do other modifications to where the spring was needed to balance or can the spring be added regardless to help?
Could've knife edged the butterflies too. No cents in half assing it, go all out.
I don't think I have smooth enough hands not to take too much out. 😕
Looks like that spacer was Cracked ? did you Crank down on it too Hard ??
I installed the spacer and the 1/8 inch gasket that comes with the rebuild kit.
Were you able to use the higher fuel pressure spring with the stock fuel pump? I've had people tell me I have to get a different fuel pump too. Im cheap so id rather not blow that kind of money on this lol
I put the high pressure spring in it, but I didn't see too much difference, except 10 mpg. I put the stock spring back in. It felt the same, but I got 12 mpg. I little while later, my fuel pump went out. I honestly don't think you need a bigger spring unless you do some bigger mods than I did.
I have been running the stock spring for about 4 months now, and it runs as good as ever.
@crescenthammer thanks for the quick and thorough reply! I haven't done any big mods to my truck yet so I guess I'll keep the stock spring. All I've done is an EGR delete, smog pump delete, cat delete, flowmaster style muffler with 3 inch exhaust pipe, 4 inch tall filter and chrome air cleaner and about 4 inches of air cleaner spacers. Just cheap simple little mods. It runs great like it is but I could always use more. ;)
@Sc0teeBe318 I'd say with those mods, save your money for something else, and keep the stock spring.
@@crescenthammer what should I get next that won't break the bank but add some power?
I wonder how this would work? Say you get a vintage 1992 454 throttle body and a Chevrolet Performance LSX 454 Long Block Crate Engines 19417357. Would the Throttle Body work on a newer motor like that?
Just have to wire and tune it. You could do a stand-alone system. Get inputs from the engine sensors (as many or as few a you want) and throttle pedal.
What I was thinking is leave everything original original 454 throttlebody computer OBD one all original if that would work on a new type LSX engine?
@ericmesi1764 yeah I supposed. Distributor vs cam position sensor would be difficult to figure out, but b in sure you could.
check out the all in one units from FAST & Holly sniper!@@ericmesi1764
I need this exact rebuild kit. Where can i find it?
I believe I got it from napa. www.napaonline.com/en/p/CRB21752. Many manufactures make them, just Google your favorite parts store.
Any power difference?
Yeah, you can feel a little more at WOT. Cruising at 80 is way easier.
No sir...on 47 ponies...😂😂...
Which mod was that.
Did the modifications to the TBI improve acceleration or fuel economy?
Acceleration was improved, and cruising speed was improved. It used to have to work to maintain 85, and now I'm barely a quarter throttle cruisin at 85. Fuel milage went down, I'm pretty sure that's because of the 15 PSI fuel regulator spring. I'm sure with stock spring, it would improve milage.
@@crescenthammer Thanks for answering my question. The TBI unit on my Chevy truck needs to be rebuilt and I would like to increase performance if possible.
@@crescenthammerYeah honestly shouldn't need any more than 13, 13.5 psi... And install an 18 psi fuel pressure regulator spring... Timing also needs to be modified with a dynamod performance ignition module and initial spark timing advance should be set around between 10° and 12° btdc. Also you want the throttle body bores including the spacer to be rough like rough sandpaper on the inside to help with atomization and to keep the atomized fuel particles in suspension because once they hit the intake manifold especially the heat from the exhaust crossover it helps to ultra vaporize the incoming air fuel charge as it's heading towards the intake valves in each port... The smaller you can get the atomized fuel particles the better which helps increase power and torque production, but also increases fuel economy.