has anyone else experinced this? im running a 3.1in pulley on stock injectors and seeing 28.2ms of IPW at 6000 rpms? (no boost bypass) which equates to nearly 140% duty cycle using hptuners IPW to IDC conversion. which is still only a rough estimate since it does not account for injector specific flow rates. but still that seems really really high especially for 50 degree ambient temps and 72 degree IAT2 temps.

 

uhhh.. somethings wrong

 

thats what i figured but what? i think its my scan gauge

 

3.1" pulley? What size is the stocker? Can't be that different.

 

3.35

 

I think its possible. I know someone was seeing like 127% IDC bone stock!

 

i was well over 100 stock

 

You might want to look through this thread. You may find it usefull.

https://www.cobaltss.net/forums/show...highlight=dyno

Pierre

 

yeah oddly enough i changed my oil and swapped in a new set of plugs and got it down to 123% IDC at 6100 rpms again at 50 degrees, probably come down more as the iat's go up

 

Im at 91% at 6400rpm with GM Stage 2 and its 42# Injectors

 

^hey i thought you had the 60lbs from tag now?

yea ive observed 127% at 6100 bone stock, smaller pulley on stock injectors is a bad idea

 

dude the "something" thats wrong is YOU.

if your seeing IDC's over the 80 and low 90 mark you need bigger injectors.....

i've seen the stock ss's pull near/a bit over 100% stock(NOT GOOD)

and even worse on different pulley and infecter set ups.

 

NO.................. one reason he's seeing such high IDC's is because the stock fuel maps make the car run rich. If your telling the car to keep a 10.5 airfuel from 3000rpms all the way to redline reguardless if it has the injector or not it will try and keep that A/F THATS why IDC's are nothing with out a wideband reading to go along with it. If your IDC's are 150% at redline but Your a/f's are a 10 flat does that mean your out of injector? no..... so like i said the stock fuel maps run rich his idc's probably wouldn't be that high if he had a means to tune. Im not saying they'll be below 100% who knows but they would be lower than 140%

 

wow your kind of an ass huh? and that is just a f***ing dumb statement just because your idc's are high does not mean you need bigger injectors cut and dry just like draksun said. not if your on a rich tune. if my pcm was commanding lower air fuels i would still have some more injector, enough......more than likely not.

and i bought the pulley awhile back because intense and zzp both say that its safe with colder plugs. so i went on that. obviously a mistake. i had 42lb injectors when i bought it and was planning on throwing those in. and decided to switch to a 2.8 and 60lbers i just havent switched to that setup yet

what would be stupid is if i was driving the car hard with this set up. or much less if i was drving the car without any knowledge that i was in danger of running my injectors static. right now if i do get on it a little bit as soon as i see 18ms of pulse width which is ussally well before 5000rpms i jst get out of it. not really a problem for me i will just switch my setup before i hit the track this year.

 

leaning the car out can only solve so much and unless you have at least some way to monitor the car i would advise against it....once you start to tune the car its abilitys to "reconfigure" per weather go down a bit.....

and i agress with your "idc isnt anything with out a wideband" to back it up then run your injecters past the 100% IDC and wach your afr change in a hurry as you go farther and farther over that mark, all dependent on airflow.

none the less even if you lean the stock car out a bit anyhitng into the 90's% IDC is pushing your luck because over time its going to wear on the injector and eventually cause issues!

yea i came off like an ass, i'll apologize for that but this place kills me, i spend most the day fighting with people with very flawed information....its a pain in the ass but i hate seeing wrong info posted becase it can only lead to issues.

now as for "leaning out the car to run a lower IDC" plan yea it could work but with out some form of a monitoring device is a bad idea in my eyes, as you change the way the car thinks, its limits and such its ability to safely compensate for weather changes goes down, end of story....

i understand your reasons for buying pices and such, price is always the golden rule!

i say good for you that you get out of it once the IPW goes past a mark but i'd still say it always better to adjust the car then your driving habits, more so because its safer, who knows if you forget to watch the IPW one time and something goes wrong....