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Random knock?

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eder-loco

15+ Year Contributor
133
0
Feb 19, 2006
pasadena, Texas
So last night i was racing a couple of cars on the highway, well i missed a gear and instead of putting it on 4th i stuck it on 2nd. Making the car rev to 9k rpm for about a second. so i put it in neutral and just finished putting it on 4th gear. it drove fine, felt fine, sounded fine.
Well after that every time i try to get into boost it starts knocking. I will go WOT and at about 4500k rpm and @ 15psi. it starts to knock. everytime!!! Can the ecu be pulling timing due to the over rev? i never tried to turn off the car because i wanted to make it home first. Any ideas? maybe disconnecting the battery?

It is a built motor With 272s cams/Crower springs and retainers. rebuilt head. I get about 5 degrees of knock @ 4.5k rpm and the timing is at 3.5 at that point.
 
What's a normal knock count for you guys? I regularly get knock at idle and normal driving into the 20's, but I'm using a power FC on a RB25.
 
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