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beepbeep beepbeep is offline
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Join Date: Jun 2001
Location: Sweden
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Is exhaust pipe on the right and wastegate pipe on the left? In that case, fire is coming from wastegate as well...

It all depends on where you connect wastegate boost signal hose. If hose is connected to throttle body, there will be instant vacuum and wastegate will be kept shut on deccel, negating any flames.

If hose is connected to intercooler/pre throttle, sudden liftoff will make still spinning turbocharger try to pack air against closed throttle. Depending on size of turbocharger and BOV-valve, you might see a sudden boost peak pre-throttle until BOV evacuates the air, which might crack the wastegate open for a while and allow flames to escape trough the wastegate pipe.

Frankly, I don't find flames terribly amusing as they tend to heat up the exhaust and in worst case (Juan) set the rear skirt on fire.

If EFI is installed, flames are permanently "cured" by zeroing the fuel cells in the table where there is high vakuum and high revs. This is essentially a fuel cutoff, which makes engine draw zero fuel on decell. It will delete the flames, make engine more fuel-efficient and neutralize the popping sound on deccel when exhaust isn't hot enough to produce flames.

Some people like it that way, some don't. On CIS, there is a special deccel valve (brass disc with three pipes) which sole purpose is to neutralize excess fuel being dumped into engine on decell. Plugging this one will make even CIS car dumping flames.
Thank you for your time,
Old 04-21-2007, 06:11 AM
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