after getting the cavy back up and running i went for a rip with the car without the cold side piping being used as a cai, well the car under full throttle would rev no problem up to the rev limit but now it goes up to around 3800 rpm and seems to hit a wall and not want to rev up any further
Very difficult to understand what you're saying about the cold side piping not being used as a CAI.
But there is a limiter in Park and Neutral that is set at 4000 RPM. Are you trying to rev in Park or Neutral, or is this happening while driving around?
2001 Olds Alero (LD9)
650 whp / 543 ft-lb
@turboalero
Are you saying you have no intake on it? If so that could be the problem. Too much air.
FU Tuning
i will clairfy further, sorry guys
before hand, i had no air filter on and it had no hesitation/stutter at all
but now with the cold side of my intercooler piping on with a cone it has issues at the 3800rpm+ mark
are you trying to suck through your intercooler without a turbo pushing the air through it? You are hitting a perfect vacuum in your intake @ that RPM...can pull no faster.
"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous
no intercooler is hooked up, just the cold side piping and the filter hooked where the intercooler would have been
just confused as to to how before with no filter/tubing just open air to the tb it would drive with no problem and now with the piping/filter it has the problems.
i had even unplugged the negative terminal thinking that perhaps the ecu needed to relearn when i did the piping/filter install
maybe i will just use hpt's scanner and post up the log and see if anyone can decipher anything
hmm....ok, yeah, that is weird.
"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous
yeah, thats what im saying.
i havent tried since to try without the piping/filter on though, i am thinking that it does just need tuned seeing as how its the gm s/c reflash trying to run 750cc injectors and ho mani/header and all the top end work and such
Wait you are running the gm reflash N/A?? That is your problem!
eh? unless GM did something entirly gay with the tune...it shouldn't make a difference. As far as I remember(since I dont mess with stock ecu's...lol) all they did was make the SD tune extend out past the idle condition of the factory and give a vac+ boost map to see the baro pressure. There's no way GM could have done something so dumb that requires the SC to be running to drive the car. I hope not atleast.
"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous
If its the s/c tune then that might explain why the car doesnt like to go above 3800. I dont know how the car would respond because the fueling is based on MAP and RPM. It might run OK in the lower rpms but once it gets in to the high rpm ve table i would guess it would run insanley rich because there is no positive pressure coming in to the engine.(Which is what that calibration is for) Acutally just looking at it there is no high rpm cell in the s/c program to account for atmospheric pressures. Since there is no boost i dont think the car would want to run at all. I don know maybe i am wrong. I am just trying to come up with reasons why the car wont run correctly.
Still have the 2 bar map plugged in?
Could it not seeing boost affect it?
wait wait...closed loop guys...if the map shows no boost then the inj. pulse width drops. You can cruse down the road with 0 boost in an SC car. The SC tune runs SD which will add or pull fuel depending on the baro. Like I said, unless GM did something stupid...running the SC reflash on an na car should have no problems at all. I dont think it is the tune...but again, I'm not a factory tune kinda guy and I dont ever care to find out how they did it. I'm just saying how it should work and how the SD system works. Which I know you guys know this. Interesting to hear that above those RPM's there is no vac bins....that is so dumb.
Edited 1 time(s). Last edited Friday, July 24, 2009 6:51 PM
"Never argue with an idiot. They'll drag you down to their level, then beat you with experience!" -Anonymous
no clue whats happening still *sigh*
well wtf............
car is running just fine now and revs up to the 7000rpm limit instantly, god damn i cant wait for boost again!!!!!!!
i take back the last post, its doing it again, i think its tune based so im just gonna take it easy til i can get it on the dyno again and get everything worked out
D-Mac wrote:Still have the 2 bar map plugged in?
Could it not seeing boost affect it?
I could see it causing a problem if he doesn't have a 2-Bar. Because if not the computer would be thinking it's in boost when it's not, and be pumping in WAY to much fuel, which would make it load up real bad and lose power.
www.gmscf.com
I've also had a similar issue. I bought a used m45 kit that was missing some parts. I also bought a ecu that was supposed to already have the 2bar tune on it. I installed the ecu, the 310cc injectors and the 2bar map sensor only and the car would not rev above 3500 rpm or so. I couldnt figure out the problem so its back running the stock injectors, map sensor, and ecu
SHOoff wrote:D-Mac wrote:Still have the 2 bar map plugged in?
Could it not seeing boost affect it?
I could see it causing a problem if he doesn't have a 2-Bar. Because if not the computer would be thinking it's in boost when it's not, and be pumping in WAY to much fuel, which would make it load up real bad and lose power.
I know from experience if you run a 1 bar map on a GM reflash car will not idle for crap. This is because you are getting a different reading and the idle fuel is map based, so fueling is not correct.
FU Tuning
