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Charlie spring user reporting in

In message <Pine.SOL.3.91.960901102158.21169C-100000@apollo> "Graydon D. Stuckey" writes:

> 	I have a Charlie spring with two shims, plus a regulator on the 
> top side of the wastegate.  No solenoid at all.  My boost control is 
> entirely mechanical/pneumatic.  So far it is very reliable, but that 
> doesn't mean it won't fail.

If it does, the fool pump shutoff should still save your engine.  As long, that 
is, as the ECU is being fed good information.

> I think I am going to try the stock spring 
> again with the solenoid in place, and use RDH/SJM's ECU probing tricks to 
> control boost.  I _think_ it will spool up faster.

That's the theory - positive holddown versus Hook's law.

Should we eventually develop some sort of system condition indicator based on 
the overboost control valve's duty cycle, you'll benefit from that too.

Phil Payne 
 Committee Member, UK Audi [ur-]quattro Owners Club