Toycows

[PDQSHIP@aol.com]

In a message dated 96-03-14 11:36:45 EST, you write:

>
>>ignition and cam advance in the MC motor can make the early motor as good
as
>>the later.....  
>
>How does one advance the ign timing -- PROM/CPU mods?

Either I would suppose....  Mine is PROM based/

>
>How much cam advance in degrees does one get with the suggested
>one-cam-sprocket-tooth-advance technique?
 
A little debate on that one, believe it's between 6-8 degrees (tho 8.5 sticks
in my brain)......
If you run a 10vturbo and haven't tried this cam advance, you are missing
some serious FREE tweeking for the hour job.....  You can ALWAYS put it
back....  Must admit, have not tried it yet on a 89.5> turbo car, you will be
hitting the knock sensor pretty easily in hot weather with the increased
compression would be my guess....

>
>>The computer upgrades to the 89.5 10vt motor are limited as
>>well.....   
>
>What's 'limited'? Are the mods just 'limited' is the sense that the factory
>has already incorporated some of the mods done to the pre-89.5 CPUs into the
>post-89.5 CPUs negating the need to incorporate these additional mods?

8.4:1 compression kinda steals some of the effective compression ratio
limit....
>
>>The 89.5 - 91.0 10vturbos used the k24 unit found in the 91
>>20v200 and the S4.....  Low end throttle response was the object of the
>>change, but high end airflow is less than the k26.....
>
>With the stock cam, exhaust and rev limit, is the K24 unit really the
>limiting flow factor? With the cam advance and/or IA CPU mods?

I ran a k24 for a while and found it peaked pretty quickly.....  That was
with mods tho...  with the stock setup, you prolly have more lowend torque
sooner than the k26....  But a k26 can overtake the k24 at the mid/high end
pretty quickly...  And, tweeking a k26 to put out RS2 type specs is easier
than doing ANYTHING to a k24....  A k24 is a great stock/torque type turbo, I
don't sell it short for it's design or purpose.....  But, as a base for
Hi-hp, the k26 is a better baseline, the options are just the depth of the
wallet....    Working on one app right now that is a mod k26 in a S4 (with
LOTS of mods) and there IS a difference....

Scott