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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Balance at idle may not necessarily translate to balance at WOT.

There are reasons to run CIS a bit fat. One being possible variances in AFR's per cylinders from ware and or design limitations.

The other is due to the fact that the system can not compensate for things like changes in ambient air temperatures like a good EFI system dose and pull back timming or add more fuel. Even then most makers of new Turbos (i.e. Subi STI...) run them fat (in the 10's on boost) as protection. If one is going to run in the low 12's make sure the system is fuel ballanced and set the CO on a cool day. This will give you more fuel on the hot days and a bit of safety.

Best practices is to have the injectors cleaned and checked for balance. Then, and then, check the head for balance or have it serviced and bench tested.

Could read your spark plugs from time to time I guess.

Not much more to be gained beyond that. Extrude honing the manifold might be the only other thing that may or may not be of benifit.

Old 05-08-2009, 04:25 PM
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