[torsen] RE: RS2 turbocharger

[Bernard Littau]

Hi Dave,

That does surprise me that the RS2 is slower in the 2700 to 3800 rpm range,
but then, much surprises me.

How are you calculating your % difference in the outcome column?  Row 3 is
clearly incorrect, as the RS2 is faster.  Row 2 looks suspect, as does Row
1.  I get 36.2% slower, 9.3% slower, 3.6% faster and 5.5% faster.

I still think you need to compare like with like.  I can make the numbers
vary 10% within those rpm ranges on my car (10V MC) by adjusting the cam
timing to favor low end or high end.  I suspect I could get even more
variation by comparing a hot cam set up for high end against a stock cam set
up (timed) for low end.  This would be with the same car with the same
turbo.

While this is a good topic, and I for one would sure like to know where the
K24 and the RS2 turbos perform best and how they compare to each other, I
can't conclude too much from your numbers as the test has too many unknown
variables.

You really need to swap the turbos between your RS2 and the S2, run the
tests again, and do a 4-way compare :-)

Best,

Bernard Littau
Woodinville, WA
'88 5ktq

> -----Original Message-----
> From: David Eaton [mailto:deaton at tranzrail.co.nz]
> Sent: Thursday, June 13, 2002 3:23 PM
> To: 'Bernard Littau'; 'Quattro List'
> Cc: torsen at audifans.com
> Subject: RE: [torsen] RE: RS2 turbocharger
>
>
> i used the 6th gear times for illustration, as the engine speeds
> are slower
> and more illustrative of the lethargy of the rs2, which was the discussion
> point.
>
> however, if you look at the 3rd gear times, where the engine speeds are
> inevitably faster, the effects are the same, i.e. k24 beats rs2, but the
> deltas are different.  particularly interesting in these data are the
> performance of the 2 cars in the 2,700 to 3,800 rpm range, where
> most would
> assume that the rs2 would have ascendancy.  not according to
> these figures -
> the k24 is still comprehensively faster.  this, once again, ime, is
> indicative of the lethargy of the rs2 below about 3,200rpm.
>
> mph     rs2    s2     rpm range        outcome
> 20-40  5.7    3.8  (1515 to 3030)  rs2 22% slower
> 30-50  3.2    2.9  (2723 to 3788)  rs2 27% slower
> 40-60  2.8    2.9  (3030 to 4545)  rs2 14% slower
> 50-70  3.6    3.8  (3788 to 5303)  rs2  5% faster
>
> dave
> '95 rs2
> '90 ur-q
>