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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Originally Posted by RarlyL8 View Post
The system pressure needs to be raised to 95-100psi for applications at or above 400whp in order to assure correct AFR at top end. This adjustment is also part of what allows the possibility of accurate full range AFRs without the use of the RPM switch. The flow rate over the entire range of function is increased to a level that will facilitate adjustably outside of normal parameters.
Agreed and accepted as to flowing more fuel.

An inexpensive HF head mod is seems.

Seems to add more fuel everywhere from what I am learning. Thus, should require recalibration of the WUR to work properly or AFR's between idle and redline WOT will be exaggerated.

If you get 10% more fuel every where you can readjust idle CO but need to slow the advancement of the metering plate about 10% for correction. Or do things like the RPM bost clamp I guess.

However, why not just access the fuel the stock head makes with an Andial fueler or using the reprofiled fuel plate first to retain more civil fuel delivery.

Of course, the Digital WUR can tame all bad behaver inherent in jacking the fuel deliver of the fuel head.

So many options. That is a good thing.

Old 03-10-2009, 07:04 PM
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