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Old 05-27-2003, 01:47 PM   #1
Scooby Specialist
Member#: 19338
Join Date: May 2002
Location: NJ
05 Legacy GT

Default ecutek possible problem?

Hey everyone,

Back in february, i had shiv tune my car with the ecutek for stage 1. It dynoed at 229hp and 238 lbs of torque and the air/fuel was tuned perfectly. This past saturday i dynoed my car without any mods since the last dyno, and it only put out 221hp and 228 lbs of torque and the car was so rich that the line graph basically was off of the dyno sheet. Now the weather conditions were much different,temps in the 60s and it was rainy but is it possible my car was tuned for the cold weather and will run like ass until it turns cold again? Should i send the ecu back to shiv to possibly reflash it again or am i just worrying too much?
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Old 05-28-2003, 01:21 PM   #2
Scooby Newbie
Member#: 16393
Join Date: Mar 2002
Location: Indianapolis
2003 WRX / 03 EVO8
02 Aprilia RSVmille


It sounds like your ECU is compensating for temp as normal. I would use the Live User 'adjustability' feature the adjust the trim levels (if you have that option/delta dash). Then you can get it reflashed with the up-dated values. It dosen't seem that your losing 'too' much power for me to think there is a problem.

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Old 05-28-2003, 01:40 PM   #3
Scooby Guru
Member#: 22825
Join Date: Aug 2002
Chapter/Region: NWIC
Location: Seattle, WA

Colder weather will almost always offer better performance. Colder air is denser plain and simple.

The difference in power levels is so negligible that I wouldn't worry at all about anything. Infact you could attribute the changes to not only weather, but also dyno correction factors as well.
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Old 05-28-2003, 03:03 PM   #4
Scooby Newbie
Member#: 19576
Join Date: Jun 2002
Location: San Francisco Bay Area
2002 Subaru WRX
Platinum Silver


Did you reset your ECU during your latest Dyno session? Couldn't hurt to reset it and have it learn for your current weather conditions.
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Old 05-28-2003, 03:07 PM   #5
Scooby Specialist
Member#: 10972
Join Date: Oct 2001
Chapter/Region: South East
Location: Tampabay, Florida
2004 STi (fuxor3d!!)
2004 Forester X


I notice a fairly major varience in performance between the Florida cooler/less humid mornings and the much warmer/humid afternoons.

I have trouble reaching ~15psi in the afternoons but when the temps drop I can easily hit ~16psi. This is al using the FBC with an AccessECU Stage II and supporting mods.
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Old 05-29-2003, 11:25 AM   #6
Member#: 12262
Join Date: Nov 2001
Location: Florida's source for Subaru

The Ecutek job will compensate for external inputs such as temp, altitude, or more typical, a cheap tank of gas or whatever.

Was it the same dyno?

It's tough to compare numbers from different dynos as well.

We've rechecked early Ecutek jobs and they are very stable. It can't really "change".

Can't comment on Access, not sure how they do things.

Just some ideas....

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Old 05-31-2003, 05:57 AM   #7
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Member#: 12454
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: Vermont
10 Toyota Taco
K8 SV650SF


It was the same dyno, they actually had his old graph and you can see that he lost some power pretty much throughout the revband. It was alot warmer and it was raining on/off all day though.
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