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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
The following is a good example of how AFR's are supposed to look like. The fuel system on a 930 is designed to support about 300hp. After that, things start to get interesting.
Originally Posted by RarlyL8 View Post
I use the stock rebuilt WUR on my personal car. I dug through my files and found a baseline run for you. As you can see it does not dump fuel at boost onset. This WUR is not adjustable.

Go beyond 300hp and the fuel metering plate moves past the metering cone and air starts to spill quickly around the metering plate and the plate starts to stall and things go lean quickly.

You can see this better in the following pictures.

Originally Posted by cole930 View Post

If we want to get these cars to work well w/o add ons at higher HP levels, this is the area that has to be improved upon. We need to extend the cone down further. Do this and there will be plenty of fuel for most.

Think of that cone like the map on an EFI system. This is the programming that determins our AFRs.

Manipulating control pressure can only do so much.
Old 05-05-2009, 09:20 PM
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