well those IAT2's aren't that bad with that size pulley.... do they drop pretty quick after a pull ?? Mine usually hit 150 and drop real fast down to 125 or so. they cont. to drop back down to my avg of 109-115.

 

That's with stock cooling and stage 2 injectors and gm tune right?

 

no with my gm stage 3 pulley, gm stage 3 tune, 42lb injectors, opt. b

 

Yea they drop down really quick where will my iats have to be before i lose power

 

the car usually starts pulling timing when IAT2's reach high 140's - 150's.

 

No I was asking that to the guy who wrote that I will be ok with a 2.9 wit no cooling mods and 42 injectors and on the gm tune

 

oh i got ya .... well, a 2.9 is iffy. it's on the verge of being not safe when running it on a GM Stage Tune, because it maxes out the injectors. Now, if you have proper cooling mods and dont beat on your car everyday you will be ok with a 2.9 on a GM Tune.

 

How do I measure my idc's? To know how close my injectors are to being maxed out? And I don't beat on my car everyday and cooling mods will be coming very soon

 

well, idc isn't as important as your pulse width .... if you have an interceptor guage it measures pulse width. i think some where in the neighbor hood of 15-18(ms) pulse width is static on the GM Stage Tune(which means the injectors aren't providing anymore fuel). you can convert injector pw to idc at this website (http://www.stealth316.com/2-calc-idc.htm)

i recently pruchased the GM Stage III PCM, and I must say combined with the GM Stage III pulley makes it a very nice setup. Safe, yet nice and powerful.

 

Ok so if I have fuel left how much is ok to run a 2.9?

 

its not about how much fuel you have left. your factors to determine if it's safe are the injector pw/idc's, IAT2's along with your A/F ratio. many people run a 2.9 on the GM Stage Tune with no problems. just make sure you monitor evereything.

 

Yea and see I don't have a wideband gauge Idk my afr but I thought the gm tune depends a 9.8

 

my interceptor displays and reads a/f. the gm stage tune commands anywhere from a 10.5-10.7 on avg. depending on year/version of the tune. my 07' gm stage tune commanded a 10.8 a/f ratio. my stage 3 tune commands a 11.4 a/f ratio.

 

How does yours read afr?

 

theres a command a/f ratio selection. if you go to set up, it's under the list of parameters for selection. the interceptor reads the a/f ratio of the car through the cars PCM. widebands usually attach right to the downpipe to read a/f ratios.

 

I know how widebands hook up but the afr stay at 14.8. How do I set that up?

 

Do you have a cat?

 

Nope no cat!

 

i just got my interceptor so it might be a newer version of the software. there site doesnt even list command a/f ratio. mine is usually at 14.7 (Stoichiometric mixture) while cruising, but once i go wide open throttle the a/f ratio richens up. i didnt have to set anything up. i selected it under the list of parameters in my setup menu. i actually recorded last night when i was doing a wide open throttle run to see how my a/f ratio changes as i get in the upper rpms.

 

*shakes head*

Your looking at commanded afr...

Which could possibly be NO WHERE NEAR your actual afr.

 

explain yourself

side note: i'm new to the interceptor gauge so don't be a smart ass with your *shakes head* ****.

i'm here to learn as well.

 

Damn ur inceptor is a beast. I just got mine and it won't do that. I got mine about 1 month ago

 

i'm not sure if im right now. shortstack has yet to answer my question. we will see.

 

The commanded AFR is the AFR that your computer is being told to run.

The point of a wideband is to see the actual AFR, which the stock sensor cannot pick up.

Your computer could be commanding a 11.2 afr at WOT, but it may be actually only running 10.8...

The computer tries to calculate how far off the actual afr is from the commanded one, and adjust itself.. but it doesnt always work out.

Thats why in tuning, a wideband is very important, because you can dial in your computer to get it to the right afr.

You can however take the signal from your wideband and display it as a parameter, but without a wideband you can only view the commanded afr.

 

thanks

So when my interceptor guage is reading 11.4 at wide open throttle that means thats the a/f ratio my GM Stage 3 tune is commanding?