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Old 06-12-2006, 07:02 PM   #1
Scooby Specialist
Member#: 4329
Join Date: Feb 2001
Location: Cleveland, OH
2005 LGT Wagon 5MT

Default ECU reset with a UTEC?

i installed a new battery yesterday after my original finally died.... almost 5 years to the day after i got it. heres my question... does an ecu reset do anything if you have a dyno tuned map being used?

im asking because after the battery install my car feels slower than it was i havnt done a reset in a loooong time, and i cant ermember if ive ever experienced this.

btw, UTEC, VF-30, TBE, pinks and pump.

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Old 06-13-2006, 01:31 PM   #2
Scooby Newbie
Member#: 43482
Join Date: Sep 2003
2004 JDM 2 litre STI


You'll have to wait till the stock ecu adjust the fuel trims, this takes about 200 KM of driving.
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Old 06-13-2006, 05:11 PM   #3
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Member#: 64246
Join Date: Jun 2004
Location: Reno, NV

If you are using open-loop fueling on the UTEC, a reset makes no difference above 25% throttle. The ECU's recalibration has no effect on the UTEC in open loop.

If yours is an older UTEC using closed-loop fueling, then yes, the ECU's learning will affect the UTEC's performance.

Either way, idle and part throttle will perhaps change a little as the ECU learns after reset.
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Old 06-23-2006, 03:42 PM   #4
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Member#: 97642
Join Date: Oct 2005
Chapter/Region: SWIC
Location: Phoenix, AZ
2002 Wrx Sedan


Check out this link

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