RE: ECU Upgrade/Boost Questions

["Mike Miller" <JoMi@msn.com>]

Could be a bad WGFV or a crimped  hose from the back of the IM to the turbo 
bypass valve. Measure the resistance across the WGFV - as I recall, it should 
be in the 25 - 35 ohm range - higher and boost will be low. The hose from the 
IM->bypass valve is notorius for getting pinched where it comes out of the IM 
(drivers side by the firewall - goes in back of the engine and then under the 
heat shield on the pass side)  - this will prevent boost pressure from holding 
the bypass valve closed allowing boost to bleed off. You can try restricting 
the hose from the WGFV to the WG (use a pair of vise grips or just unplug it) 
- this will prevent the WGFV from opening the WG and you should have *lotsa* 
boost. Do not do this if your overboost cutoff has been disabled. 


> -----Original Message-----
> From:	gregsj@mail.imm.com [SMTP:gregsj@mail.imm.com]
> Sent:	Friday, March 07, 1997 10:28 PM
> To:	quattro@coimbra.ans.net
> Subject:	ECU Upgrade/Boost Questions
> 
> Fellow Audians, prior to an ECU upgrade, the boost guage on my '91 200
> 
> TQW would sometimes read 1.8, but easily read 1.7. After the upgrade 
> it read 1.8 pretty quickly and stayed there. After a week, the highest
> 
> reading I'm seeing now is 1.6. I had my mechanic check all of the 
> usual hoses. He has a smoke generator as well which he sent through 
> the system under pressure and found no leaks that way either. Where 
> should we look next? TIA for your help and expertise. GregJ