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

[Djdawson2 at aol.com]

In a message dated 9/14/2004 7:11:56 AM Mountain Daylight Time, 
mswanson at sonitrol.net writes:

> Hi Dave,
> 
> I've been reading this thread with interest.  I've been doing some
> experimentation of my own.  Currently I'm running RS2 EM, 42# racetronix
> fuel injectors, stock exhaust, w/034 T04E hybrid 57 trim and Mihnea
> chipset (this uses a modified k26 turbine housing and t3 turbine wheel).


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


> 
> My initial goal was RS2 like performance without the RS2 price (much
> like yourself).  I was disappointed with the low end response from the
> turbo as the response is very slow from the 57 trim (roughly 2psi at
> 2800, 5 at 3k, 15 at 3.5k, 21 at 4k+


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.


> 
> I'll be installing a different turbo next week, an 034 T04B (40 trim if
> memory servers) compressor wheel w/modified k24 turbine wheel and
> housing.  This combo hasn't been tried before but my goal is to run the
> same peak boost of around 21-22psi yet have it ramp up to full boost no
> later than 3k.


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.  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.

> 
> No dyno numbers on the 57 trim, but I will have dyno numbers for the new
> turbo on the 25th (as well as numbers for before/after the
> Swanson/Mullane FMIC kit....)
> 

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.
Take care,
Dave