I got an 05 cav and i have the hahn racecraft stage 2 turbokit. In order to boost it higher i was told i need the 02 or 03 ecu. SO i bought the ECU and i swapped it out but the car doesnt start and i already tried 2 diffrent ecu's. First was a used 03 and a i just bought a brand new ecu from the dealer and still the same thing. Can anyone help me out with this THANK YOU.
If you were currently able to supply sufficient amount of fuel on your 05 Cavalier, there was no need to swap PCMs. The reason they said that was because the 02s and some of the 03s were more leniant as far as changes being made. The later models, people claim, will continue to try and stay stoich at 14.7, not matter what changes you make.
Also, boost is only relative to your turbocharger and internal "wastegate". You'd need a boost controller to have more PSI of boost. A boost controller will delay your actuator signal, which in result, will delay the wastegates response in opening to regulate the turbine speed.
So the question is, were you able to adjust your fuel consumption with the FMU that Hahn supplied you with your 2005 computer? If the answer is yes, but your stock computer back on and buy yourself an boost controller if you want more boost.
FYI: Boost controllers come manual controlled and electronically controlled. They also vary in prices.
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Thank You but when my car was on the dyno i continously ran lean at high rpm and thats what they told me to do. If i was running 8 psi i would be fine but if i wanted to boost it any higher i would need to get a reflash. I already have the boost controller im just scared i dont want to blow anything. Thank You very much for the help i really appreciate it.
if lean at the top end and you do not want to reflash run a ramp set up fuel pressure regulator if your car uses return set up if not, get a good grounding kit and a fuel pump buster to add fuel on top end. or get the reflash!! and the other ecu did not work because you can not just change them they must be reflashed to work with your body control modules, it did not start cause it thought it was being stolen. any dealer will reflash those for around 39.00 and 20 min. of your time hope this helped
Nico Santos wrote:Thank You but when my car was on the dyno i continously ran lean at high rpm and thats what they told me to do. If i was running 8 psi i would be fine but if i wanted to boost it any higher i would need to get a reflash. I already have the boost controller im just scared i dont want to blow anything. Thank You very much for the help i really appreciate it.
Ok a couple things to address...
If your'e running lean on the top end it can be 1 or a combonation of things:
1. Not large enough injectors
2. Your FMU isn't tuned properly
3. Your FMU isn't actually raising your fuel pressure
4. Your fuel pump isn't capable of sending the fuel you're demanding
To be completely honest, I think in your situation, it's probably #3...quit possibly #2 if they don't know what they are doing.
Now, with this post in reply, it makes more sense of what you're doing. I think you just misworded the previous post. If you're running lean on 8 PSI, you defenitley do not want to raise your PSI cause it will just make the situation even worse.
I will say this though, swapping computers isn't going to solve your problem. There really isn't a "reflash". That's a general statement made by people who don't know about your vehicle/computer specifically. The only reflash you could possibly get is the GM reflash made for the GM Superchargers but would probably be more of hassle for you to do if you don't know anyone at a dealership. Basically, they aren't allowed to reflash a non Supercharged Jbody and convincing some service manager and technician to lie for you ain't happening. Even still, there is no adjusting from this point on computer wise and I'm not 100% sure on how your PCM will run as far as fuel consumption with the reflash (heard of issues but not 100% sure).
Best thing for you to do is invest in HP Tuners. Get your comptuer adjusted with the dyno tuning shop and also look up how to convert your computer to reading just 1 Bar to over 1 Bar. This basically means that your computer will be able to read over atmospheric pressure (boost).
If you have any other questions feel free to ask here or on the forum in my signature. Good luck.
www.kronosperformance.com / 732-742-8837
brad eisenhauer wrote:if lean at the top end and you do not want to reflash run a ramp set up fuel pressure regulator if your car uses return set up if not, get a good grounding kit and a fuel pump buster to add fuel on top end. or get the reflash!! and the other ecu did not work because you can not just change them they must be reflashed to work with your body control modules, it did not start cause it thought it was being stolen. any dealer will reflash those for around 39.00 and 20 min. of your time hope this helped
He has an FMU (or atleast should be installed cause it came with the Hahn Kit). The FMU acts as an Fuel Pressure Regulator and actually part of the kit is to remove the stock Fuel Pressure Regulator so it can act as one.
www.kronosperformance.com / 732-742-8837
k than it should be fueling fine, but might not be working, might have gotten a bad part. does it throw a check or service light? if no than the problem might be the fmu, it could be defective. also you need to just check the boost level too, sound like he is trying to run more than the kit is designed for. and his map should be fine to 7-9 psi even with out a flash map sensor are very lenient, but reflash or up grade with the kit should have took care of this. all in all it is your fuel, i only had this problem around, 12 psi with the stock ecm setting for the redline ecm. than with reflash prom code and dyno time fixed all! my suggestion suck it up check boost level and PAY for a dyno time!!! it will tell you the problem, than you can work from there.
brad eisenhauer wrote:k than it should be fueling fine, but might not be working, might have gotten a bad part. does it throw a check or service light? if no than the problem might be the fmu, it could be defective. also you need to just check the boost level too, sound like he is trying to run more than the kit is designed for. and his map should be fine to 7-9 psi even with out a flash map sensor are very lenient, but reflash or up grade with the kit should have took care of this. all in all it is your fuel, i only had this problem around, 12 psi with the stock ecm setting for the redline ecm. than with reflash prom code and dyno time fixed all! my suggestion suck it up check boost level and PAY for a dyno time!!! it will tell you the problem, than you can work from there.
What reflash are you talking about?
www.kronosperformance.com / 732-742-8837
