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werid question about tuning

Old 09-Jun-2007, 07:38 PM
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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?
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Old 09-Jun-2007, 09:00 PM
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you were running 13.5's with only 180whp? i'm no drag expert, but that seems quick to me.
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Old 09-Jun-2007, 09:16 PM
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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.
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Old 10-Jun-2007, 12:23 AM
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sounds weird. who tuned it the first time around? i'd go back to them and ask wtf?
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Old 13-Jun-2007, 02:48 PM
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Who did your tune??
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Old 13-Jun-2007, 03:09 PM
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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.
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Old 13-Jun-2007, 04:32 PM
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Originally posted by trigga
i couldt even hear a vtec crossover. vtec was hitting slightly like a stock engine would.
vtec isnt supose to come on strong or be crazy loud, if it does you need to adjust vtec xover.
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?
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Old 14-Jun-2007, 07:04 PM
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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.
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Old 14-Jun-2007, 07:43 PM
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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.
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Old 14-Jun-2007, 07:48 PM
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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.

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.
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Old 14-Jun-2007, 07:52 PM
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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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Old 14-Jun-2007, 07:53 PM
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open loop = no o2 correction
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Old 20-Jun-2007, 03:34 PM
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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.
ditto... but i still need a zpos tune
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Old 23-Jun-2007, 06:45 PM
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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.
That reminds me, we should get together sometime to finish mine.
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Old 23-Jun-2007, 07:20 PM
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did you get a proper IAT setup?
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Old 23-Jun-2007, 07:29 PM
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Originally posted by Bryce


ditto... but i still need a zpos tune
andy, havent heard from you in awhile.

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