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Ignition timing and detonation


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I dug out a tuning book I have from David Vizard.. he claims that given a NA engine on 97 octane reguires say, 35 degrees total advance, that a forced induction engine would have total timing reduced 1.1 degree for each 1psi of boost. So 10 psi = 24 degree advance. Not sure what the boost limits are in his formula??.. cant imagine 32psi=zero advance

I have seen Davids tuning forum but cant locate it at the moment to ask him.

(OK maybe this is it....

Graham Bells book, Forced Induction Performance Tuning shows 20-25 degrees as an example for a turbo engine, and goes on to state that 'if not overdone' slightly retarded timing improves turbo spoolup.

This article on the detonation proceses is interesting:

A solution..

Edited by f1karting

If you set no goals you shall surely reach them..

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