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Registered User
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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.
thoughts?
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1987 930 1956 Chevy 3100 2009 Subaru Forester 2003 KX250 X2(I like my toys!!) |
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05-21-2009, 06:51 PM
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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!
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MikeD '87 930 |
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05-21-2009, 07:35 PM
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OFF THE BOOST PIPE NOW...
Join Date: Oct 2003
Location: Mount Pleasant, South Carolina
Posts: 5,496
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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.
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05-22-2009, 11:35 AM
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