Re: Sad but true, TQC < TQ

["Mike Hopton" <mike@genesis-microchip.on.ca>]

     John,
     Sorry to hear you are so disappointed with your ur-q's performance. 
     Does the Abt computer modification involve changing the EPROM in the 
     computer or are they resistor/zener/op-amp modifications to the output 
     of the signal from the pressure transducer?
     
     I know all the North American ur-qs have very "relaxed" boost/revs 
     versus timing advance curves. I've looked at comparissons between an 
     '86 5KTQ and an '85 ur-q (and the '85 ur-q has a newer computer than 
     your '82 vintage ur-q, unless of course you have a Euro MAC01?).The 
     5XTQ has a lot more ignition advance at higher revs and higher boost 
     pressures than the stock North American ur-q. Of course the 5KTQ has 
     the advantage of a knock sensor to back things off if you run cheap 
     petrol. A North American ur-q was designed to run safely on the 
     poorest quality petrol of the early 80s.
     
     I don't think any of this will make you any happier. And ignition 
     advance with the Abt computer may not even be a problem? Anyone else 
     have suggestions????
     
     Happy New Year Audiphiles, Mike