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Ben V Ben V is offline
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Join Date: Oct 2009
Posts: 29
Garage
So we have spent another long evening on the dyno, up to 81 power runs.

Tried plug gaps from .022-.035 no change in miss. We have had AFR's as rich as 0.79 but 0.82 seems to be best 499.7 hp with 1.15 bar and a miss!

The problem is definitely heat related 1st run is almost clear the miss get progressively worse by every consectutive test. EGT's even across both banks at about 750 degrees C.

The miss causes big blue flashes/flames from the exhaust. The miss only seems to occur when the manifolds are glowing dull red and hotter.

We are only running 0.7 bar of boost at present, seeing 409hp on the 1st run then 386hp with the miss.

Still no nearer finding the fault, any other Ideas?
Old 06-01-2011, 03:39 PM
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