[s-cars] RS2 "Killer" dyno results

[Djdawson2 at aol.com]

In a message dated 8/16/2004 1:39:08 PM Mountain Daylight Time, Elijahallen92 
writes:

> I really don't get all this hype abot an RS2 Killer turbo. Why not just 
> step up to a K27 cold side and the big #6 hot side??

Personally, I have no interest in messing with KKK compressors, and no 
interest in messing with KKK turbines on my own car.  IMHO, they are outdated, more 
expensive, harder to obtain, and offer fewer tuning options.  BTW, it's not 
hype, it's just the informal name given to a turbo produced by ITS.  
  The goal on the particular car being worked on (not my own) is simple:  
Over 300hp peak for a useable span (say 2500rpm), 400ft/lbs of torque... 
hopefully by 3500rpm, and a compressor capable of producing these numbers without 
turning into a heat pump.  This guy wants to maintain a fairly simple path, and at 
this point doesn't want to mess with ICs.  Using an RS2 EM necessitates the 
use of a KKK hot side.


 A #8 hot side is to big in my opinion unless your running a FMIC and a 
tubular 
> EM.

This is not necessarily true.  Clearly, if you use a Stage 3 wheel with a 
2.227 exducer (larger than RS2), performance suffers.  I believe it to be a poor 
choice for the moderately modified AAN.  However, there are other options to 
explore using the #8.

 I had two Garretts with #8 before this one. A #6 with a 15 degree clip and a 
K27 
> 7200 will spool up by 3500 RPMs and blow the doors off an RS2 turbo'd car 
> from 4000rpm on. I have/had both and did many side by side tests and the 
> difference is huge. 
> 

I'm a big believer in hard data.  "Blowing doors off" is not hard data.  No 
offense, but I prefer scientific methods.  Show me your dyno chart ;)  Also, I 
won't even address the practice of clipping turbine wheels to compensate for 
not having the right wheel, heck... the RS2 turbine is a clipped K24 wheel.  
For me, it's just another reason why I don't need to mess with the KKK stuff.  
Again, this is just my preference... not intended to offend those working with 
KKKs.  Obviously, good results can be had using them.
  It is interesting that you note that the RS2 is left behind at 4000rpm+ 
because at the boost levels produced with the popular RS2 software, that is when 
the RS2 compressor begins to get in trouble.  If you look at the dyno runs, 
you can see that the Garret does indeed outperform the RS2 in the higher rev 
range.  The big issue, however, is that due to the shift in (and loss of) torque, 
it is much less useable power in everyday situations.  That's what we're 
trying to cure.
Take care,
Dave