[torsen] RE: RS2 turbocharger

[Bernard Littau]

Hi Dave,

You wrote, some time ago, in this debate:

> 		lets look at the maths from the stopwatch numbers.  take the
> k24 aby s2 vs
> 		the rs2 in top (6th) gear, and the in-gear increments.  time
> in seconds, rs2
> 		1st, then s2.  using the gear ratios (specifically
> speed/1000 rpm figures) i
> 		have derived the engine speed at the mph range for each car
> - which is in
> 		brackets after the time in seconds.
>
> 		Mph     rs2    s2     rpm range        outcome
> 		20-40  14.8  11.1  (813 to 1626)    rs2 33% slower
> 		30-50  12.5    8.9  (1220 to 2033)  rs2 40% slower
> 		40-60  10.2    7.0  (1626 to 2439)  rs2 46% slower
> 		50-70   7.7     6.1  (2033 to 2846)  rs2 26% slower
> 		60-80   6.0     6.4  (2439 to 3252)  rs2   6% faster
> 		70-90   6.1     6.8  (2846 to 3659)  rs2 10% faster
>

This assumes both cars are trying equally hard.  One would need to know that
neither car is somehow retarding the ignition or otherwise trying to
compensate for a pretty low rpm with high throttle situation.  You are
really in the engine lugging area, and lifting the head gasket can be an
issue.  It's possible the factory added code to protect the engine to the
engine management system, or that the knock recovery algorithms are
different.

I know that in some more modern drive by wire cars (Saab), even the throttle
plate is not fully open in these kinds of situations.

Someone really needs to try both an RS2 turbo and a K24 turbo in the same
car, back to back.

Just food for thought.  Anyone know the reality of what the motronic does in
these situations on the various cars?

Best,

Bernard Littau
Woodinville, WA
'88 5ktq (RS2)