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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
Posts: 5,565
Pop-off valve should be deleted alltogether. The very reason for backfire is probably the overrich condition caused by pop-off valve that is there to cure it. Turbocharged engines have very long airpath between inectors and airbox (containing turbo inbetween) that backfire is very unlikely if AFR's are OK.

You should pressure-test whole assembly the way I tipped Alan about. Pressurize it to whatever boost you are running +4 PSI and make sure nothing leaks. These engines are full of leaks.

Also, a little intercooler wouldn't hurt either.

If you fancy experimenting, you can fuel it with E85, lower the control pressure until you reach same AFR, up the boost a bit more and run more agressive ignition timing.
Thank you for your time,
Old 01-05-2008, 02:18 PM
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