Is it possible to put a supercharger on a tbi 350

Tparkridge · Feb 20, 2024

I’m just curious and I’ve been beating around with some ideas and was wondering if you can run a supercharger on a tbi or does it need to be carbureted

kvgsqtii · Feb 20, 2024

https://www.procharger.com/truck-suv-superchargers/gm-truck/1995-1988-chevy-silverado-tbi/

Looks like procharger makes a kit.

Sean Buick 76 · Feb 20, 2024

In short it’s not a great option to use a supercharger on the stock TBI setup. Below are a few reasons and pointers.

1. The stock TBI and injectors are limited to roughly 320 HP. Anything with boost puts you over 400 right away.

2. The TBI computer isn’t easily tuneable.

3. You could swap to a vortec EFI and 0411 computer setup and then pay a tuner to dial it in.

4. You could use a CSU Holley carb and I can bet you would be almost spot on with the carb out of the box. I’ve done 3 builds with these carbs and the air fuel ratios are spot on from 2 psi to 25 psi without any tuning to the carb.

5. An aftermarket EFI system is likely your best bet. Under $1000 gets you a 4 injector 800 Hp capable system that you or a tuner can tune.

L31MaxExpress · Feb 21, 2024

Years ago, I had a stock low compression 1-ton TBI, 1.6 roller rockers, tri-y headers, Weiand 177, 454 TBI unit, MSD BTSM6 box and a rising rate FMU. I did a little tuning on the stock TBI ECM but it was blind to boost. The fuel injectors were the high pressure 61# marine injectors. They flow 61# @ 13 psi but something like 104# @ 30 psi. Under 10 psi of boost the FMU had fuel pressure cranked up to nearly 50 psi. Ran, drove and cruised stock until the throttle was open enough to make boost.

Doing it this way, I connected the MAP to a a T of the manifolds boost port through a fitting with a small internal orifice, then a hose to a T. The straight through leg of the T had a check valve on the opposite side from the manifolds inlet port, the T leg went to the MAP. This eliminated a High MAP code going into boost by bleeding the boost off the MAP sensor. Under vacuum the MAP worked normally as the check valve sealed the bleed when the blower was not undet boost.

Sean Buick 76 · Feb 21, 2024

L31MaxExpress said:
Years ago, I had a stock low compression 1-ton TBI, 1.6 roller rockers, tri-y headers, Weiand 177, 454 TBI unit, MSD BTSM6 box and a rising rate FMU. I did a little tuning on the stock TBI ECM but it was blind to boost. The fuel injectors were the high pressure 61# marine injectors. They flow 61# @ 13 psi but something like 104# @ 30 psi. Under 10 psi of boost the FMU had fuel pressure cranked up to nearly 50 psi. Ran, drove and cruised stock until the throttle was open enough to make boost.

Not a bad combo for back in the day!

I have a vortec brand kit that came with a supercharger for the TBI engines. It comes with a TBI spacer that’s got two fuel injectors in it. There is a vacuum line that sees boost and a little box that gives the supplemental fuel injectors a signal to spray more fuel as the boost raises. I just have it stored on the shelf but it’s pretty cool. I dont have the supercharger, but it would work well with a turbo as well.

L31MaxExpress · Feb 21, 2024

Sean Buick 76 said:
Not a bad combo for back in the day!

I have a vortec brand kit that came with a supercharger for the TBI engines. It comes with a TBI spacer that’s got two fuel injectors in it. There is a vacuum line that sees boost and a little box that gives the supplemental fuel injectors a signal to spray more fuel as the boost raises. I just have it stored on the shelf but it’s pretty cool. I dont have the supercharger, but it would work well with a turbo as well.

Some of the Vortec kits had the auxiliary injectors as well. There are several companies that still make a piggy back auxiliary fuel control capable of driving even 8 injectors. Saw a 454 SS setup years ago with the Edelbrock MPFI conversion system. The truck idled and drove on the stock TBI system, the massive Procharger was fed using Methanol through the Edelbrock MPFI injectors via a seperate tank. Very strong running truck. That truck had a HT502 running the MPFI conversion prior to gaining boost. Roughly a 1,000 hp truck with the supercharger and when not in boost drove like it was stock on the stock fuel system.

ShadowRejects · Feb 21, 2024

L31MaxExpress said:
Years ago, I had a stock low compression 1-ton TBI, 1.6 roller rockers, tri-y headers, Weiand 177, 454 TBI unit, MSD BTSM6 box and a rising rate FMU. I did a little tuning on the stock TBI ECM but it was blind to boost. The fuel injectors were the high pressure 61# marine injectors. They flow 61# @ 13 psi but something like 104# @ 30 psi. Under 10 psi of boost the FMU had fuel pressure cranked up to nearly 50 psi. Ran, drove and cruised stock until the throttle was open enough to make boost.

Doing it this way, I connected the MAP to a a T of the manifolds boost port through a fitting with a small internal orifice, then a hose to a T. The straight through leg of the T had a check valve on the opposite side from the manifolds inlet port, the T leg went to the MAP. This eliminated a High MAP code going into boost by bleeding the boost off the MAP sensor. Under vacuum the MAP worked normally as the check valve sealed the bleed when the blower was not undet boost.

super cool. Always love hearing stories of people making things work

Is it possible to put a supercharger on a tbi 350

Tparkridge

Newbie

kvgsqtii

Newbie

Sean Buick 76

I'm Awesome

L31MaxExpress

I'm Awesome

Sean Buick 76

I'm Awesome

L31MaxExpress

I'm Awesome

ShadowRejects

I drank the Kingpin koolaid

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