[Audi20V_Kruemmer] Re: WG connection, EM design

Mihnea Cotet mik at info.fundp.ac.be
Sat Dec 7 23:06:47 EST 2002

Hi guys!!!

Who can explain to me the principle of the S1's anti-lag system please? Is
it just rerouting the air from the bypass valve back into the exhaust
before the turbine? What are the pros/cons?



At 16:40 7/12/2002 -0500, JShadzi at aol.com wrote:
>What is the advantage of having the wastegate exhaust source come directly
>from the
>individual cylinders, rather than after they are combined, in this pic:
>This is assuming I am understanding what the plumbing is doing.>>
>Ken, its tough to know exactly what the user was doing from this picture, but
>that looks an awful alot like the Audi Sport anti-lag system, where intake
>pressure is vented back through the turbine instead of going to atmoshpere to
>keep the turbo spooled.  If so, bravo, that's a trick and very nice piece to
>have on a turbo car, especially with a large turbo and high hp.
>If in fact the above was simple for wastegate purposes, I'd say it was a big
>waste of time and work, and I can't imagine that log manifold helps control
>(or flow) exh. manifold pressures any better than a well placed runner in the
>collector.  Frankly, there just isn't improving on the simple design, granted
>whenever the transitions are smoother, there is better flow.  Here's what I
>came up with, I have rock solid boost, simply spools up and the needle is
>rock solid all the way to 7krpm, up to 20psi so far:
>Jim did a good job of this too:
> >
> > <<In the Maximum Boost book, typically wastegates are connected after the
> > collector, and the more of a "Y" shaped fork between that turbo and
> > wastegate, the better.>>
>Yes, Corky's analysis is right on IME, no need to get any fancier than that.
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