hey i have a 50 trim with 750cc injectors, a returnline, and dtec. The car is crazy rich and bucks a jerks, I am just trying to get it dialed in a little better so I can have it closer to where it should be before getting tuned tomorrow. Any help is apprecitated. Also I have a scanguage and the guage does not appear to be reading my knock, ltft's, or stft's, how can i get it to do that or do I have a bad unit. Any help getting the car running somewhat correctly is appreciated.
First of all we need to know what fuel pressure your running on the returnline. Are you running static pressure or have a boost source hooked up?
Second are you pulling any fuel yet on the dtec or is it zero'd out?
As for the scan gauge i don't know whats going on. There shouldn't be any knock at idle and should read zero.
it isn't reading knock at idle, the pressure is hooked up to a boost source, the pressure with no vac is at 43. Dtec is pulling around 20 across the board and still cruising im in the 11's for af at 25% load. It almost seems like dtec is not able to pull any fuel out, like its not doing anything.
it isn't reading knock at idle, the pressure is hooked up to a boost source, the pressure with no vac is at 43. Dtec is pulling around 20 across the board and still cruising im in the 11's for af at 25% load. It almost seems like dtec is not able to pull any fuel out, like its not doing anything.
Okay.
There should not be any knock at idle.
What PCM do you have? All my comments are assuming you are on Stock ( I hate the term "Stage Zero" ) or Stage 1. If the PCM is Stage 2 or 3, stop here and tell me.
Remove the boost source from your FPR and just run a static fuel pressure. This should make tuning the DTEC easier on the big injectors.
In the idle area of the map ( < 1000 RPMs ) you should probably be pulling about -30% fuel to maintain a decent idle w/ fuel trims in an acceptable range.
In the light load columns ( 25% load, 50% load ) all the way up the RPM range you should probably be pulling about -20% or so.
Are you confident that the DTEC is wired correctly?
If you think the scan gauge is not reading correctly on your car, put it on another person's car and see what it does. Ideally it would be a stock, or close to stock car. What brand gauge is it?
i finally fixed the scanguage issue i had a buddy put my turbo back in when we got it back and he forgot to plug in the o2 sensor.... the knock is coming at wot and im dumping a ton of fuel in at wot. i am confident it is installed correctly but it seems that it is not working at some points. So pulling 30% at idle is acceptable?? there is no knock at idle and yes im on stock computer which i call stage 0 because stock is confusing. the fuel trims seem to have cleaned themselves up at part throttle and are only pulling 7 on ltft... but then it randomly goes to pulling 20%. I just want to get this issue fiixed.
man the best way to tell if the dtec is working properly is to put the scan gauge on load and turn the dtec up or down at idle and see if the load increases or decreases......if it does not then you have a problem.....
no matter what tho at idle the stock computer should have been able to pull fuel out to compensate for the 750's.......but a not plugged in or installed o2 would be a good reason it would not work.....
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yea i have the fuel return line turned to 43... yea the ecu can compensate now but the compensation goes from being right on with my tune all the way to being no where near from stop light to stop light at idle. No I am not using the agp base map i modified a 650cc tune for use with my rc 750cc's. Shouldn't the ecu not have to adjust the idle much because the dtec is doing it. The car runs like shit and is knocking like a bitch at wot. Just trying to get the damn car running good. I was going to try to break some stock motor records but now my car is running like shit so i dont even want to bother with dtec until i can get the built motor and ems in.
it recieves boost and vacuum actually.... its coming directly off the throttle body... I have everything set right around there thats why im wondering about the dtec I am somewhat capable with tuning... but it doesn't seem to be helping me out. The cams and gears are not in the car yet... I was waiting till this issue was fixed and maybe not even until I put together my built motor
it recieves boost and vacuum actually.... its coming directly off the throttle body... I have everything set right around there thats why im wondering about the dtec I am somewhat capable with tuning... but it doesn't seem to be helping me out. The cams and gears are not in the car yet... I was waiting till this issue was fixed and maybe not even until I put together my built motor
Big no no you loose fuel pressure in vacuum that way. Needs to be boost only source such as off the compressor housing.
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dtec big turbo extremely rich... help tuning
) or Stage 1. If the PCM is Stage 2 or 3, stop here and tell me.
pm me for more info
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