Well, stage 2/xtc catted 2.5/GMPP Touring and the injectors are 134% duty cycle on HP tuners. Anyone else seen this. Kinda sucks now im going to have to get the 60#s it looks like.

Kyle

 

Yeah the stage 2 with a 2.8 is too much for the injector, you went way over.

 

What would be the best pulley size for the following set up?

GMPP Stage II
GMPP Touring Exhaust
GMPP Manifold
Injen CAI

I would like to run a smaller pulley then the Stage II comes with but I want to be on the safe side. I'm not one to take risks just for a few more ponies...

 

yea a datafile would help alot

 

Might of miss understood. I have stage 2 aka 3-inch.

Ill try and post i didnt save the log. Ill have to take it out again and log it!

Kyle

 

Yeah i did, I saw 2.5" and i was thinking pulley size not exhaust size.

 

NO knock. my wideband wasnt working. So i went by MV on the o2. and got it to around 920MV. On my camaro that is about 12.0 AFR. I run a 13.0 AFR on the camaro and its about 890MV. I kept having to throw fuel at it. Ill try and get out tomorrow and log it again. Its sposed to rain but ill try.

Kyle

 

Heck Im working on a car now it has a 3" and a full exhaust with stock intake and its well over 100% idc. I saw at 6500 a idc of 118%. In my opinion it goes to show you how every vehicle is different.

 

is that with the stock injectors? if so then it doesn't suprise me.

 

I went up to 6700 rpm's in mine and the injectors were fine. I think I was around 80% when I did the pulls. This is wierd how we all get different numbers

 

dirty injectors, extremely rich mixtures, and/or plugged cat could explain why everyone's numbers are so different.

 

IDC means nothing without some AFR numbers to go along, maybe you are giving your setup to much fuel and thats why your IDC is so high.

 

LOL mv on a NB i2 sensor mean NOTHING! if it's around 500 mv, it means your around 14.7, if it's different than that, all it means is that you are not at 14.7. They can only measure between 14 and 15ish. they tell you NOTHING for AFR during open loop.

Just estimates:

12:1 = 920mv +/-
13:1 = 920mv +/-
14:1 = 920mv +/-
14.3.1= 800mv+/-
14.7:1= 500mv +/-



as you can see, ANYTHING leaner than 14.7:1 pretty much means 900+ mv. If you didn't know that..... you really need to let someone else tune your car, sorry.


Also, post a log, you might be calculating IDC incorrectly (as I have seen a good number of people do)

 

thank you. If your tell the car you want this much fuel at this rpm or a command A/f of 11's or somthing like that its gonna try and do that and the IDC is showing what duty the injector would have to be at to fufill that request.

 

There is no way your 42lb injectors were 130% or more with only a 3"

My 42lbs with a 2.8 wasn't even that high. DAMN.

 

stop being poor and buy a wideband. you can not trust your narrowband to give you 850mv = blah, go slap whomever told you this.

 

K guys I went and got a log saved. Let me know whats good bad wrong right and what i can do to improve this.

send me a pm with your email and ill send you my log!
PS the WOT is at the end! about 20 mins of driving!
Kyle

 

I've been hearing a lot about the Stage2 42.5#'ers not being able to hold up with a 2.8". It was starting to scare me (Paranoid Tuner!). It would be nice to get some actual FACTS on this subject matter, so that I know now that I need to get new injectors... not somewhere down the broken road.

 

Just an update. Couple people saw for them selves the 42#s cant handle the duty of the gmpp manifold/cat back/stage2/xtc down pipe/ and Free cold air. There at 139% duty cycle right now. At WOT. So its time for some 60#s.

Kyle

 

have all taht and i get low to mid 80s with tunning a 2.85.

 

I would contact HP Tuners, you could be data logging the wrong PID,
134% with your mods does not make sense.