When good turbos go bad...

[roccit_53 at scirocco.cs.uoguelph.ca (C Boyko)]

But all in all, the fact that you "enjoyed" it as much as you did proves
that the concept worked pretty well. Maybe this is just Carrot's way of
keeping you from that little 77 blondie a bit longer...
Cathy

On 10:12 am 07/15/07 "Drew Mac" <type53@xxxxxxxxx> wrote:
> On 7/15/07, Eric S <scirocco@xxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> >  How where you controlling the nozzles?
>
> A dual-diaphragm can - vacuum moved the nozzles to no-boost for idle,
> and a throttle switch shut the vacuum source down.  This allowed for
> no boost at idle/low boost cruising.  The (approximately) 11 psi
> spring in the can controlled the boost pretty well, no spikes.
> Transition of the nozzles was controlled by the force of the
> diaphragm, which was smaller than the stock TDI cannister.
>
> It worked pretty well all told, from the time I settled on that method
> (the day before driving to Cincy) to the time the impeller shaft
> parted.
>
> I had just completed a long hard pull in 5th from about 1700rpm (a
> MAJOR no-no) which put the compressor pretty much smack in the surge
> zone, and presumably weakened the shaft  I then immediately followed
> that up with a hard launch from a stop sign which resulted in the
> catastrophic failure.  Very embarrassing when the cars you just passed
> drive by you as you're smoking on the shoulder... And I mean
> SMOKING... ;)
>
> Drew
>
> --
> 84 Wolfsburg Ed. Scirocco GTD mit ?berVerteilerpumpe
> http://scirocco.cs.uoguelph.ca/gtd
> 77 Scirocco project - Boom Boom Boom...
> 99 A3 Jetta GL TDI (hers) 02 Jetta GLS TDI (Bloatware)
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