Turbo is in but...
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Joined: Aug 2004
Posts: 4,356
From: Jersey (orig. NorCal)
RE: Turbo is in but...
ORIGINAL: simple
BaconBait
You would need some one who is good with B5 to look in to it.
From what i see you have a programming problem.
Your A/F reads below 11 at low RPM under load - this is not right. As full load and 4K RPM you run low 11 AND pull timing due to knock.
This is not right. Get the software sorted out. I do not think this is hardware problem.
Who's chip do you run?
BaconBait
You would need some one who is good with B5 to look in to it.
From what i see you have a programming problem.
Your A/F reads below 11 at low RPM under load - this is not right. As full load and 4K RPM you run low 11 AND pull timing due to knock.
This is not right. Get the software sorted out. I do not think this is hardware problem.
Who's chip do you run?
Bed time.
1st Gear
Joined: Sep 2005
Posts: 5
From:
RE: Turbo is in but...
ORIGINAL: BaconBait
I'm going to try turing the fuel pressure up to see if that helps the timing and A/F. It's currenty at 44 psi.
Bed time.
ORIGINAL: simple
BaconBait
You would need some one who is good with B5 to look in to it.
From what i see you have a programming problem.
Your A/F reads below 11 at low RPM under load - this is not right. As full load and 4K RPM you run low 11 AND pull timing due to knock.
This is not right. Get the software sorted out. I do not think this is hardware problem.
Who's chip do you run?
BaconBait
You would need some one who is good with B5 to look in to it.
From what i see you have a programming problem.
Your A/F reads below 11 at low RPM under load - this is not right. As full load and 4K RPM you run low 11 AND pull timing due to knock.
This is not right. Get the software sorted out. I do not think this is hardware problem.
Who's chip do you run?
Bed time.
And again, I am not a pro, this is only my best guess....
1st Gear
Joined: Oct 2005
Posts: 53
From:
RE: Turbo is in but...
OK so let me clarify.... I don't mean he should run his car without a MAF forever... But if he thinks the MAF is the problem I am telling him that he can unplug it and go for a run.... Yes it will run rich and blah blah.... In five minutes he will be able to rule out one possible source of his problem.
ORIGINAL: onepoint8tee
Do you have logs to prove that "it ran exactly the same"????
A maf is used to determine the mass of the air entering the engine. The air mass information is necessary to calculate and deliver the correct fuel mass to the engine. If you take it out, you are going to run rich no matter what. The ecu doesnt see the signal so it makes sure to add more fuel because it isnt gauging the amount of air flowing which for all it knows could be a crap load of air and make you run lean.. Most ecu's know to add extra fuel if a MAF signal is non existant to prevent it from running lean.. Especially the ecu's that are tuned for forced air induction. Im sure without a maf you are running at least a little rich which in the long term will reduce the life of your cat/02 sensors, and short term hurt your fuel efficiancy.
ORIGINAL: donsupreme
I think you don't know what a MAF does........
Some cars run totally MAF LESS. I don't know if the UNI programming is written with some kind of safe mode, but my MAF failed... It gave Signal Too Low code (as good as dead). I then tried to run with the MAF unplugged and it ran exactly the same......
ORIGINAL: onepoint8tee
Thats just stupid.... Dont you know what a MAF does?
ORIGINAL: donsupreme
Hear this!!!! --- Plug out the damn MAF completely!!!
I was able to boost the same as with it plugged in.
Hear this!!!! --- Plug out the damn MAF completely!!!
I was able to boost the same as with it plugged in.
Some cars run totally MAF LESS. I don't know if the UNI programming is written with some kind of safe mode, but my MAF failed... It gave Signal Too Low code (as good as dead). I then tried to run with the MAF unplugged and it ran exactly the same......
A maf is used to determine the mass of the air entering the engine. The air mass information is necessary to calculate and deliver the correct fuel mass to the engine. If you take it out, you are going to run rich no matter what. The ecu doesnt see the signal so it makes sure to add more fuel because it isnt gauging the amount of air flowing which for all it knows could be a crap load of air and make you run lean.. Most ecu's know to add extra fuel if a MAF signal is non existant to prevent it from running lean.. Especially the ecu's that are tuned for forced air induction. Im sure without a maf you are running at least a little rich which in the long term will reduce the life of your cat/02 sensors, and short term hurt your fuel efficiancy.
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Joined: Sep 2005
Posts: 13,664
RE: Turbo is in but...
ORIGINAL: donsupreme
OK so let me clarify.... I don't mean he should run his car without a MAF forever... But if he thinks the MAF is the problem I am telling him that he can unplug it and go for a run.... Yes it will run rich and blah blah.... In five minutes he will be able to rule out one possible source of his problem.
OK so let me clarify.... I don't mean he should run his car without a MAF forever... But if he thinks the MAF is the problem I am telling him that he can unplug it and go for a run.... Yes it will run rich and blah blah.... In five minutes he will be able to rule out one possible source of his problem.
1st Gear
Joined: Oct 2005
Posts: 53
From:
RE: Turbo is in but...
Keep us updated on what you find out.
It should be easy to track down such a blatant boost problem. Unlike my problem.... I might peak @ 18-20 psi, but I cannot get anymore.... This is harder to track down..... At least I know what the source of my problem is now .....
It should be easy to track down such a blatant boost problem. Unlike my problem.... I might peak @ 18-20 psi, but I cannot get anymore.... This is harder to track down..... At least I know what the source of my problem is now .....
Thread Starter
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Site Moderator
Joined: Aug 2004
Posts: 4,356
From: Jersey (orig. NorCal)
RE: Turbo is in but...
I disconnected the wastegate vacuum line to confirm the boost controller was causing the boost problem. I have a new one on the way to solve that problem.
Here's the results I got after turning the fuel pressure up to 48 psi.
The second run is a log of driving back home.
Here's the results I got after turning the fuel pressure up to 48 psi.
The second run is a log of driving back home.
