werid question about tuning
09-Jun-2007, 07:38 PM
#1
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werid question about tuning
Does anyone have reason why this could happen.?
anways i was making 215whp. i went to the track last fri and noticed i was falling on my face and it felt like my car was running like a dog. running ****ty number like 13.5s
So i put it on the dyno and the car was making 179whp. reloaded the comptuer and everything was back to normal?
does the tune edventaully die out? or could it be the humidity?
anways i was making 215whp. i went to the track last fri and noticed i was falling on my face and it felt like my car was running like a dog. running ****ty number like 13.5s
So i put it on the dyno and the car was making 179whp. reloaded the comptuer and everything was back to normal?
does the tune edventaully die out? or could it be the humidity?
09-Jun-2007, 09:16 PM
#3
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on slicks on course but i went to the track thign that iwas really pushing 215whp which would be enough to break 12s no problems. but yeah apperently somthing was messed up with comp need a reload i couldt even hear a vtec crossover. vtec was hitting slightly like a stock engine would.
13-Jun-2007, 03:09 PM
#6
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what are you using to tune your car?
you are not the first one i heard this happened to...
I heard it happen to VWs and Toyotas... it really depends on what you are using to tune your car... i highly doubt you are you using a stand alone (which would not give you this problem)
i'm guessing its probably crome or kinda of piggy back tune, so just reflashing it does the trick, its rare but it happens, no idea why.
you are not the first one i heard this happened to...
I heard it happen to VWs and Toyotas... it really depends on what you are using to tune your car... i highly doubt you are you using a stand alone (which would not give you this problem)
i'm guessing its probably crome or kinda of piggy back tune, so just reflashing it does the trick, its rare but it happens, no idea why.
13-Jun-2007, 04:32 PM
#7
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Originally posted by trigga
i couldt even hear a vtec crossover. vtec was hitting slightly like a stock engine would.
i couldt even hear a vtec crossover. vtec was hitting slightly like a stock engine would.
When u had it on the dyno the second time what was your IAT like as well the OAT for both times you dyno'd?
14-Jun-2007, 07:04 PM
#8
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What codes did the ecu throw before you reset it? Sounds to me like it could have been stuck in open loop because of a sensor throwing a code. Your car will end up using the predetermined maps instead of using it's sensors to adjust the air fuel ratio and it'll feel sluggish. This happens on almost every car obd1 and up.
14-Jun-2007, 07:48 PM
#10
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Originally posted by zeeman
a properly tuned car will run perfect in open loop....i've been running my car in open loop for over 2 years now since i've tuned it.
a properly tuned car will run perfect in open loop....i've been running my car in open loop for over 2 years now since i've tuned it.
Yes this is true too. For drag I always run open loop as you need the engine to be predictable, but for daily driving your fuel economy could suffer especially if the temperature changes (winter vs summer) or altitude. It sounds like the original poster however either has improper tuning, an engine problem, or a sensor malfunction.
14-Jun-2007, 07:52 PM
#11
now if you take the time to properly tune the IAT and ECT compensation tables you WILL NOT have any problems with the weather changes.
About the fuel economy, ever since my cars been tuned/running in open loop my fuel economy has increased, this is b/c i can run the car slightly leaner (in partial throttle/cruising portions of the fuel map) than the ecu will make the car run with the o2 sensor enabled (closed loop).
Now if your tuner is a hack and doesn't want to take the time to tune the car properly and to the fullest extent, then yes, its possible you will have problems as the seasons change.
About the fuel economy, ever since my cars been tuned/running in open loop my fuel economy has increased, this is b/c i can run the car slightly leaner (in partial throttle/cruising portions of the fuel map) than the ecu will make the car run with the o2 sensor enabled (closed loop).
Now if your tuner is a hack and doesn't want to take the time to tune the car properly and to the fullest extent, then yes, its possible you will have problems as the seasons change.
20-Jun-2007, 03:34 PM
#13
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Originally posted by zeeman
a properly tuned car will run perfect in open loop....i've been running my car in open loop for over 2 years now since i've tuned it.
a properly tuned car will run perfect in open loop....i've been running my car in open loop for over 2 years now since i've tuned it.
23-Jun-2007, 06:45 PM
#14
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Originally posted by zeeman
now if you take the time to properly tune the IAT and ECT compensation tables you WILL NOT have any problems with the weather changes.
About the fuel economy, ever since my cars been tuned/running in open loop my fuel economy has increased, this is b/c i can run the car slightly leaner (in partial throttle/cruising portions of the fuel map) than the ecu will make the car run with the o2 sensor enabled (closed loop).
Now if your tuner is a hack and doesn't want to take the time to tune the car properly and to the fullest extent, then yes, its possible you will have problems as the seasons change.
now if you take the time to properly tune the IAT and ECT compensation tables you WILL NOT have any problems with the weather changes.
About the fuel economy, ever since my cars been tuned/running in open loop my fuel economy has increased, this is b/c i can run the car slightly leaner (in partial throttle/cruising portions of the fuel map) than the ecu will make the car run with the o2 sensor enabled (closed loop).
Now if your tuner is a hack and doesn't want to take the time to tune the car properly and to the fullest extent, then yes, its possible you will have problems as the seasons change.
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