RE: 91 200q owners - low boost

[Trisha Bethen <trishab@mv.mv.com>]

Sounds like you need a good Turbo Doctor......Rick Cranshaw of New 
England Turbo is the best I know.....he's done some turbos for me on the 
racecar.....Mitsubishi.....and is damned good......he's straightforward, 
relatively inexpensive and his turnaround is good.....so much cheaper 
than buying a new turbo.......(we certainly can attest to that.....our 
rebuild was 1/3 the cost of a new one...).......His number
1-800-344-4309 in New England   or 1-508-234-4309.....he's in 
Northbridge, Mass....not far from the Mass Pike......

Tell Rick that Trisha sent you. 



On Wed, 21 Aug 1996, Mike Miller wrote:

> The saga continues!!!
> I spent 6 hours Sunday evening with Ned looking into the low boost problem. I 
> swapped in a wastegate from an S6 (they are the same) that Ned had "laying 
> around" and we tried it out with Ned at the wheel. First attempt got to 1.4 
> boost. Ned next tried loading the engine by applying the brakes and throttle 
> at the same time and boost went to 1.7. On subsequent tries boost would go to 
> 1.7- 1.8. Put my old wastegate back on (while doing so noticed that the hose 
> that runs from the intake manifold to the turbo frequency valve was crimped 
> where it goes over the bracket at the IM end - uncrimped it. This will 
> probably be a tech tip in the next Quattro Quarterly). Tried my wastegate and 
> boost jumps to 1.6-1.7. and even 1.8 a couple times, but also remained at 1.3 
> -1.4 a few times. Tried to isolate.  Best boost was obtained by putting the 
> small hose from the turbo frequency valve on the top of the wastegate. (91 200 
> 20v does not normally have a hose here - just an empty nipple). Played around 
> for a while and it seemed like I was getting boost pressure from the frequency 
> valve to the wastegate (which lifts the valve and reduces/holds boost 
> pressure) too early. Unfortunately, abut this time, we discovered about 1/8 
> inch play in the end of the main shaft in the turbo allowing the vanes to hit 
> the housing occasionally so our fun for the evening ended. Well, not quite - 
> Ned let me drive his car in the ~400hp configuration. The words do not exist 
> to describe this experience. At 4k rpm, you find yourself violently thrown 
> towards the back seat and 7k and time to shift is *not* very long in 
> arriving!! I definately learned alot about how the turbo and associated 
> hardware/software behave/interact on that car.
> After that, I removed the wastegate spring so no boost would build up and 
> drove my car home at a gentle pace. :(   Today the dealer informs me there are 
> no turbos in the US so I am going to have to wait to finally solve this 
> problem. And I may still have a bad wastegate.
> 
> mike miller
> 91 200q with blown turbo.
> 
> ----------
> From: 	owner-quattro@coimbra.ans.net on behalf of Phil Payne
> Sent: 	Tuesday, August 20, 1996 2:36 AM
> To: 	quattro@coimbra.ans.net
> Subject: 	91 200q owners - low boost
> 
> In message <9608192319.AA15750@wvit.wvnet.edu> Robert Myers writes:
> 
> > The pressure regulator provides an additional safeguard to prevent
> > sufficiently high boost pressures as to cause detonation, etc.  A positive
> > pressure of about 1.2+ bar above ambient (2.2+ bar as would be registered on
> > the in-dash gauge if it could still perform this function accurately [it
> > can't - the ECU mods see to that]) help generate a whole bunch of extra
> > power.  :-)
> 
> We're pointing more and more fingers at the turbo.  Did you check its output 
> for metal fragments?
> 
> Also, if I'd regularly run boost as high as that, I'd check the intercooler.
> 
> --
>  Phil Payne
>  phil@sievers.com
>  Committee Member, UK Audi [ur-]quattro Owners Club
> 
>