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Old May 17, 2009 | 12:22 AM
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velociabstract
Senior Member
Joined: Jul 2008
Posts: 4,525
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From: Puerto Rico
Default Re: Ugh. Lots of new parts, and I go slower.

I only looked at the first log but your car is shifting from first to second gear at 5000 rpm. Second to third at 5500 rpm and third to fourth at 5975 rpm or 108 mph.
The 1-2 shift is real early. 2-3 is shifting early too. Why its shifting early I don't know, but you can't go faster if the car is shifting short of full power. Also the throttle position is 100% on the 1-2 shift but the computer is closing the throttle to 43% on the 2-3 and keeping it there for 10 mph. I'm seeing slightly more boost than you (Code 3) but your not reaching full boost because the car is shifting early.

My logs show a similar problem. My 1-2 is at 5500. 2-3 shifts early if the tires are loosing traction, 5500 rpm and with traction at 6050 rpm. I haven't been to the track so I don't have the 3-4 shift logged. I'm only seeing the closing of the throttle by the computer on the 1-2 shift (46%)

From what little I've seen, the car short shifts when the tires start loosing traction. I think your overpowering the tires somehow. Did they get wet? If they did and you didn't dry them during the burnout that could be the problem. AFR and spark advance on your log looks OK to me. The tune on your car has 3 to 4º more spark advance than my car. I'm going to do an experiment tomorrow. First, accelerate easy to redline to see where it shifts without full throttle. (take traction control out the scenario) Depending on what happens I'm thinking of pulling fuse 17 and 18 to see if the car goes to redline in first and second gear before shifting at full throttle. We are suffering (or benefiting against our will) from the computers self preservation programming.

Les
 
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