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Old 09-19-2007, 03:51 AM   #24
hotrod
Scooby Specialist
 
Member#: 14141
Join Date: Jan 2002
Location: 13.239@102.85 @ 5800 ft on 13T
Vehicle:
2002 Impreza WRX
e85forum.net

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Quote:
there is just something about high speed racing in our cars that just doesnt like...
Yep the ecu does not listen for or care about detonation above about 5500 rpm. Long duration high load pushes a safe tune over the edge.

You had a safe tune for daily driving --- it was not a safe tune for extended time at WOT in 5th. The car is not under load long enough at the drag strip for it to be a problem.


Quote:
The motor had no reason to let go man!!
Yes it did, you broke a piston -- now figure out how to modify your tune so that does not happen. I would bet you are tuning on the dyno for max power and leaving no cushion for severe conditions. On your next tune, after you get your best power tune, pull a little timing out of the high load cells until you can see about a 1% drop in engine power. That will put you at MBT timing so you have a bit of cushion for when you beat the snot out of it.

Larry
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