SMahar28

iTrader: (7)

hey guys whats going on just wanted to show you what could happen when your car runs lean due to lack of fuel

OUTLAWZ RACING

iTrader: (9)

Dayum!!! Bigger and better bro!

ryarbrough

iTrader: (18)

Time for forged internals, dual pumps in the tank, and possibly some meth..

ls1290

iTrader: (20)

A little lean

99Z28LS1

iTrader: (4)

I had an STS kit on my car for almost 3yrs... started out at 472/501 and ended with 515/535... you have to crack the whip on that tuner and tell them to make sure that it is WAY safe... don't sacrifice the motor for a little more performance... just my .02

SMahar28

iTrader: (7)

Well i had the car tune & they said they put a safe tune on the car i guess that wasn't the case. I have 42 lb fuel injectors on the car & i do have a upgraded fuel pump. The engine is already out of the car & im doing a 370 forged engine forged pistons Forged connection rods Forged crank the whole deal. Im actually having someone look at the PC on the car & having the fuel injectors looked at too see what exactly went wrong. Like 99Z28LS1 said about the tune if thats the case im a little pissed at the fact that they didnt make it a safe tune. What should i run boost at with forged engine?

'Trust'

iTrader: (24)

How much boost? Your problem was probably the injectors, they aren't big enough for FI really.

1320

iTrader: (6)

No matter, who tuned it, you should be monitoring it. Babysitting a FI car is part of owning it. What do you use for diagnostics?

I ussually use an aeroforce guage, to monitor knock retard, (and everything else) and at times wide bands, egts, and etc etc etc etc...

99Z28LS1

iTrader: (4)

I ran 42lb'ers with my STS setup and it ran fine, even with a slightly rich tune. My tuner never let me in on any secrets or IDC % too

I agree with you slightly. For people that arent mechanically savy or diagnostically educated or experienced, the average "semi" knowledged car guy cant do that. especially with slim wallets like mine

1320

iTrader: (6)

The 250$ for a gauge to monitor knock keeps the piston intact.

pistons= 550 or more....a forged 370 = 3000 or more.......seeing the knock retard and taking your foot out of it before melt down.......priceless.

mike13

iTrader: (27)

Not trying to high jack the thread but what gauge can you use to moniter knock while driving? I didn't know there was such a thing.

SMahar28

iTrader: (7)

I thought the pcm was to monitor the knock sensors & changes the timing according to the knock. Is there an external knock sensor that can monitor the knock???? I would of thought 42lb fuel injectors would been plenty of fuel with a 255 fuel pump & was told there was a safe tune on the car. I will be finding out more information when the PC is sent out & having my fuel injectors flow tested.

'Trust'

iTrader: (24)

If you notice I asked how much boost first, that is kind of important. How much boost/power were you making on your 42's?

mike13

iTrader: (27)

according to a injector calculator 42's which are 48's with our high fuel pressure should be good to 550 crank horsepower, that is a conservative rating, 80% duty cycle.

'Trust'

iTrader: (24)

That is probably ok then, thats 467 RWHP with a 15% loss, however if he was over 500RWHP thats 588 to the motor which is getting close to pushing it.

SMahar28

iTrader: (7)

i was running 9 PSi car was at 460 RWHP. If you want it too be right on it would 571 Crank horse power would be pushing the 42 fuel injectors to there limit. BSFC is the amount of fuel your engine uses to make 1 horsepower for one hour. It is usually between 0.42 and 0.58 at wide open throttle. Normally aspirated engines with efficient combustion processes are at the lower end of the BSFC scale [~0.45], supercharged engines tend to be towards the higher end [~0.55].

mike13

iTrader: (27)

I used .65 to come up with a conservative rating.

SMahar28

iTrader: (7)

alright sry my bad

1320

iTrader: (6)

There are ad on knock sensor systems, but the most common ls1 use via the oem pcm. Knock , once it starts is hard to stop. Cylinder pressures skyrocket. A gauge, like the interceptor (aeroforce) gauge, monitors all the oem pcm information, which includes the oem knock sensors, and the pcm ignition retard. You only see how much the pcm retards the ignition when knock is detected, but you KNOW its happening. If it does, its time for some changes, either mechanical, chemical or tune.

Silver_TransAm

iTrader: (2)

I made 540rwhp through a 4l80e with my 42/48lb injectors and one 255lph pump at about 12psi but was running out of fuel past 5500. I have ran as much as 14 on the street though for short bursts. New fuel system is in as of now though.
I also have an aeroforce scan gauge and a wideband to monitor everything though.