92 TBI throtlebody upgrades

[WS6]

Are there any throttlebody upgrades or even intake upgrades that would be worth the time and money to do on a 92 TBI 350? The truck already has headers and will recieve a small cam soon. An air intake is already present as is a spacer for the TB. I haven't messed with this for of fuel injection, so specific parts are something I am not sure of.

Thanks

[ZZ430]

Check these guys out, you'll be very happy. Their stuff really works!

http://www.cfm-tech.com/catalog/gm_t...5_products.htm

[Lowend]

I seem to recall that the Throttle Body from a 454 pickup truck is quite a big larger than the conventional small block throttle body.

[Skip Fix]

Check out www.performancetrucks.net ( think that's right) got alot of info on all kinds of truck stuff there.

[00fxd]

Holley makes a nice bolt on larger [2"] throttle body w/larger injectors.
No tuning required, good first step.

[Lowend]

How does the ECM compensate for larger injectors?

[WS6]

Doesn't matter as the cam is going in soon and will need to be tuned for that, but that is a good question if it's supposed to be a straight bolt on. I have also heard that about the 454 TB Lowend but didn't know what was needed to make it work.

Thanks for the replies everyone.

[00fxd]

If you check the Holley site they sell it as a bolt on, pn#502-[9?] depending on the year. I think the trucks come with 55# injectors, this 2" unit comes with 65#.

[gen3bu]

I Have A Stock 95 454 Tbi On Mine With A Custom Adapter To A Holley 4150 Pattern. The Stock Injector Are 80#/hr. I Had Them Maxed Out At 20 Psi So I Bumped It To 36. Now I Have Room For More Tuning. It Will Soon Have 2 Of These. The Stock 5.7 Tbi Flows @ 450 Cfm And The 454 Tbi Is 670.

Look Into The Holley Tbi Intake, It Flows A Little Better On The Top End.

There Is Also An Injector Spacer That Boosts Airflow.

The Ecm Has A Constants Calculator To Compensate For Injector Changes.

[00fxd]

I Have A Stock 95 454 Tbi On Mine With A Custom Adapter To A Holley 4150 Pattern.

On your what?

The Stock Injector Are 80#/hr. I Had Them Maxed Out At 20 Psi So I Bumped It To 36. Now I Have Room For More Tuning.

I have been told that you don't want to increase your fuel pressure over 18psi. It's hard on the drivers or so they say.


It Will Soon Have 2 Of These.

[I]Are you going to be running 2 TBI's? I wanted to do that on my Corvette but there is some tricks to that. How are you going to do that?[/I]

The Stock 5.7 Tbi Flows @ 450 Cfm And The 454 Tbi Is 670.

[I]The Holley is also 670cfm.[/I]
I hear the 454 TBI is a good way to go but there is some confusion with the wiring, it can't be that hard, plus you end up with 80 or 90# injectors with can only be good instead of the 65's with the Holley


The Ecm Has A Constants Calculator To Compensate For Injector
Changes.

Frank

[gen3bu]

it is in my 1993 sonoma, on top of a 355 with nitrous.

fuel psi will not affect the injector drivers, although injector resistance will.

yes 2 2-barrel tbi's on an offy lo-pro dual carb 180 inline intake. and honda injector resistors.

the holley is more of a bolt on for a mild 350, mine is not mild any more. it ran 13.04 @ 104 last weekend all motor on slick and 11.70 @ 118 with spray.


btw - the trck weighs 3600 and has full street trim, it is also a daily driver!

[00fxd]

What ecm[s]?

[gen3bu]

stock 1993 sonoma.

[00fxd]

fuel psi will not affect the injector drivers, although injector resistance will.

Might this be the resistance caused by the injector trying to open against higher fuel pressure? 7747 ecm?

[gen3bu]

i cant see that it will be that much harder for the pintle to open. gm ran the 1995 454 at 32 psi stock. my pcm is p/n 16168625.