camarokid94

iTrader: (2)

well i just started my 402 for the first time i still have my old H/C combo tune in it and it idled great. idle trims were off very little. then as it hit about 175 or so it would dip to about 300 RPM and pick it self back up. it did that again at aroud 178 and now i cant get it to idle for the life of me. all it does now is start idle for about 1sec and drops. when ican get it to idle for a little bit i noitced the STIT kept climbing allthe way to 14.*^*( and then it dies????


i tuned my old 233-239 AFR205 11.4:1 346 to idle i did all the tuning spark and stuff. now my 244-248 AFR 205 11.7:1 402 for some reason is kickin my hinnee

any ideas????

ChrisS@sdpc

What does your base (running) airflow look like? It sounds like it is way off if the STIT was adding 14 x/y. What units are you measuring g/s and what software are you using?

camarokid94

iTrader: (2)

at all temps up till it died the stit was around .20 i only niticed it would climb when i could get it to idle now. i was aligning it right now and i started it to set toe and it idled good its just when it get about like 177 that it goes crazy.
air flow is in the 14.43 at 133 13.12 At 154 11.95 at 177 10.20 At 198

camarokid94

iTrader: (2)

now the stit are going in the 30s in all temp cells im lost

edcmat-l1

iTrader: (10)

Did you change the engine size in your tune? If it still thinks its a 347, that would make it add a bunch of fuel with the fuel trims. but then again, it should have been messin up cold too...you would think

camarokid94

iTrader: (2)

what do u mean change engine size????

oh yes and using HP tuners

edcmat-l1

iTrader: (10)

Engine;cyl volume. yours should be .708 if its still set for a 347. it needs to be set to .825 or so. That'll tell the computer what size the engine is. Also make sure if you changed injectors that you set the injector flow rate accordingly.
Those are the first 2 things to change for the computer to even get close.

MSGHUFF

iTrader: (7)

Yup also when you do that it will rescale your entire ve table so watch your afr after... Cant wait to see your results!!!

camarokid94

iTrader: (2)

me to man this thing feels like a beast all i have done is take it around the building but man at 2grand it pulls harder than the old h/c setup ever did im so pumped. props to edcmat-l1 i just guessed at .8125 before i saw what you wrote and man it idles way better still have a ways to go likes to die at stop signs but ill jsut have to work on that. i got the stit to around -.10 and ltit -.05. i cant wait for the weather to get better......!!

injectors were done with the h/c