gollum

iTrader: (1)

If you look at my dyno graph below you will see that I am running lean 14.1 with my 2002 OEM injecters. How much richer will A/F ratio get if I simply swap to 30 SVO injecters and NO tuning?

Is there any other simple way I can richen A/F ratio without tuning.

Blue line : Base run 14.1 ratio (too lean)

Red line: Nitrous run 12.7 (OK)

bigdsz

iTrader: (1)

For starters I would not run for a extended time period without tuning, dangerous. I just put 30# SVO's in my car but can't get a dyno appointment til next week. My buddy put 30# SVO's in his '02 Camaro and was 13/1 before the swap and 11/1 after.

gollum

iTrader: (1)

That was the answer I was looking for.

So if the above quote is correct I would need something in between the 30 SVO and the 2002 OEM injector to correct my A/F ratio from 14.1 to 13.1. The SVO's flow rate measures 30lbs-hr at 3bar(43.51) and my OEM 2002 injecters measure 24.7lbs-hr @3bar(43.51). So I would need a flow rate of 27lbs-hr @ 3bar(43.51) or 32lbs-hr @ 4bar(58.02). Is there one that will flow close to these figures

bigdsz

iTrader: (1)

You are flat out crazy not to get a tune, also you can't figure off my buddys numbers because he was already tuned for a CC XER 224/228. Plus he went to a CC XER 242/248 .610/.615. I don't want you to nuke your engine and that is a distinct possibility.

gametech

iTrader: (1)

Did I read that right? You're running heads,cam, and nitrous with no tuning software!

Ryan K

iTrader: (11)

I would be very weary of running around with bigger injectors untuned. The car will be extreamly rich pretty much all the time. The computer will pull as much fuel as posible to keep the part throttle AFR up, but even then I suspect that it will be over rich. The problem with running over rich is, washing the the cylenders down with too much fuel can ruin the rings and cause the oil to become contaminated with raw fuel. Both are bad juju.

Ryan K.

gollum

iTrader: (1)

I have been running my car at 14.1 A/F ratio for 2 years now with lots of wide open throttle runs and no sign of KR (on dyno) or audible knocking sounds. What are the long term side effects of running 14.1 lean other than better gas milage. According to a book I read some race engine tuners shoot for low 14 A/F ratios.

I will soon buy HP tuners or EFI live. But for now I will have to pay someone to tune it richer between 13.0-13.7

txhorns281

iTrader: (12)

Well, the generic properties of pump gas have shown to make optimal combustive power around 12.5. With the LS1, most people target 13.0 though as it seems to hold effective combustion at that mixture. I've never seen an instance on our cars where 14.1 did better than 12.5-13.0, considering the higher tendency for knock, which would equate to reduction of requested timing and/or produced timing, taking KR into the equation. If you want your car running its best, get the injectors you need to support your power goals, and you will ALWAYS need tuning get things back inline. We don't live in the dark ages anymore where you just picked and matched parts and hoped for the best, the EFI systems today are very powerful controllers of your fueling functions, make sure it's telling your engine to do the right thing....

SideStep

I have over 83 dyno runs (dyno-jet) on my current hardware/mods for testing and tuning. I have ALWAYS gained HP running leaner. Below are some examples from last month. All pulls were at 27.5 degrees advance over 3400rpms. 30 degrees of advance loss me about 7-10 rwhp...

AFR 12.......433 rwhp (sae)
AFR 12.6....438 rwhp (sae)
AFR 13.1....445 rwhp (sae)
AFR 13.8....450 rwhp (sae)

txhorns281

iTrader: (12)

keep running her leaner then

SideStep

I have, all the way to 14.3... there was no more power to be found....

gollum

iTrader: (1)

THANKS

Yea my new dyno and tuning guy recommends 13.7 AFR. What is the max timing you would recommend using 100shot wet nitrous. My current timing is:

2000rpm 22.5
3500rpm 24.0
5000rpm 26.5

SideStep

Sorry man... I am strickly NA....