[s-cars] More dyno results... the turbo issue

[Marc Swanson]

> Marc, what K26 housing are you using?  The #8 is not working for us.

not sure.  Is it just the outlet diameter that distinguishes them?  I'll
measure when I take it off.

>   Our latest route was to try the "stage1" turbine wheel.  This is the
> smallest wheel we can get, but it is in an 8 housing.  We're still not
> happy with the threshold.  The only answer available is to try a 6
> housing, or a K24 variant... neither of which is available in the
> aftermarket.

Correct, I had to donate the original K24 that came off my car to be
machined to accept the Garrett parts.

> Your boost numbers vs rpm are very similar (but a bit lower) to ours
> with the previously mentioned setup.  We are running a 5000+ft,
> however, which accounts for a lot.  My guess is that our current turbo
> would be excellent at sea level, but for our location, it isn't a
> great solution.

yes, altitude plays a major role.  I was willing to accept some lag, but
waiting until 4k for max boost is out of the question.

> That sounds like a good idea.  I think I would have opted for the 46
> trim, as it's capable of delivering 41lbs/minute... which is about
> what we need.  The K24 turbine, is IMHO, the only KKK hot side that
> will provide RS2-like results.

yes, in my discussions with Javad about it that was the conclusion we
came to.  The smaller turbine wheel is necessary to prevent lag
measurable on a solar calendar.


>   After all, the RS2 uses a K24 housing that only differs from our
> stock K24 turbos in the machining of the exducer bore... and the wheel
> itself.

There is certainly a good combination out there that will meet or exceed
the response from the RS2 on our cars.  Now to find it...

> Good luck, and post your results.  Make sure you get the exact specs
> on your new turbo... particularly what turbine housing and wheel
> you're using.

the turbine housing is stock k24.  I'm unsure if they machined the
exducer bore or not... I suspect not since I think they re-used the k24
turbine wheel.  I'll double check all of this.  I'll know more once I
have it in my hands in a few days.

Happy tuning!

-- 
-Marc Swanson-
95.5 //S6 Avant
87 4ktq
www.mswanson.com/audi