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Problem tuning Ignition with BBM 


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 Post subject: Problem tuning Ignition with BBM
Posted: Mon Dec 31, 2007 2:27 pm 
Parts Gopher

Posts: 67

Joined: 21st Feb 2005

Location: Canberra
ACT, Australia

I've recently fitted a BBM manifold to my ED XR6. I am running a MS1 ECU controlling both fuel and spark.

Before fitting the BBM I was running around 30deg Ignition advance from 2500rpm. Now with the BBM I have had to drop this to 15deg between 2500-3800rpm otherwise it pings.

I know the BBM requires different ignition timing on the long runners, but 15deg max advance seems very low. If I force the manifold to short runners I can run full advance without any problems.

Has anyone else experienced this when tuning with the BBM? What could be causing this problem?
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