Overboost and Detonation

[padev@csn.net]

Recent messages refer to detonation and limits of boost due to lean fuel conditions. 
This led me back to old manuals. One especially enlightening one is dedicated to 
turbos. It predates the knock sensor/computer controlled devices. Most protected 
against detonation via water injection (yes, they used windshield washers) or 
additional fuel enrichment. One Datsun had enrichment via an additional fuel injector 
at the manifold. It was controlled via a microswitch on wastegate control.

Audis have advantage of cold start valve. Some even have hot start pulse relay (Audi 
part number 813-906-064) to assist when engine coolant tempreature is over 95 F. No 
infor from Audo tech manuals on amount of fuel being delivered. I'm not that 
technically oriented but would imagine some curve available for amount of fuel needed 
to protect against detonation at certain boost, given base line delivery available at 
full throttle. 

My thought is a simple pressure transducer at manifold to activate pulse relay. 
Variations on this idea welcome. Also would appreciate help in control circuitry.