Like I said you cannot just reference the MAP sensor to boost pressure
to compensate. It is not that simple or else there would be one on my
truck right now. I do not remember the exact particulars but even the
Holley engineers agreed it would not work for blow through use. I seem
to remember that the system cannot accept the increased fuel pressure or
something like this. You should call Holley direct to be on the safe
side. I am sure they can explain it better than I can.
Ron
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From: Jarrid Gross (Yorba Linda, CA)
To: Motonaga, Ron (Turbo); alpines(at)autox.team.net; Paul Heuer
Subject: RE: Holley Pro-Jection
Date: Friday, October 02, 1998 11:59AM
----------
From: Motonaga, Ron (Turbo)
To: alpines(at)autox.team.net; Paul Heuer
Subject: RE: Holley Pro-Jection
Date: Thursday, October 01, 1998 4:26PM
>I had researched the Holley system for my truck a couple of years ago
>and found that it is not capable of suppling fuel above 3-4 psi of boost
>pressure. I spoke to an engineer friend at Holley and he confirmed
>this. The system is designed to run on low pressure and simply
>referencing the MAP sensor to boost pressure would not have worked.
The 3 or 4 psi info is true, but not because the injectors stop working,
but because as your boost comes up, the pressure differential across
the injector is decreasing by the boost pressure value.
This can be overcome, even on the holley system by using a port
type differential pressure regulator, whereby the injectors inlet
pressure is raised by the amount of boost, so that the injector
pressure differential is constant.
The parts needed, are the port type regulator, and a higher pressure
port type fuel pump.
Hope this helps,
Jarrid Gross
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