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mark '87 930's Avatar
Join Date: Feb 2006
Location: Toronto, Ontario
Posts: 727
detonation in third only?

I hear what seems to be detonation at WOT.. but only in 3rd gear. I recently took a long voyage with the car and was able to record some LM-1 time. All seems ok in the AFR region, but 3 gear for some reason sounds like it's not good. I don''t get it in 2nd or 4th (mind you, 4th at 4000+RPM is not easy to measure on public roads..) so I wonder if it could be transmission related.. but it really sounds like engine.

1987 930
1956 Chevy 3100
2009 Subaru Forester
2003 KX250 X2(I like my toys!!)
Old 05-21-2009, 06:51 PM
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MikeD930's Avatar
Join Date: Apr 2008
Location: missouri
Posts: 1,526
I think it would also detonate in 4th gear. Load on the engine is higher in 3rd and 4th gear. I'd back down the boost. Be careful not to detonate again!
'87 930
Old 05-21-2009, 07:35 PM
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A930Rocket's Avatar
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 7,046
Don't try to keep re-creating the detonation! Damage can occur very quickly. Verify your AF on a dyno in 3rd gear starting at 2500-3000 rpms.
Old 05-22-2009, 11:35 AM
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