Re: Switching from the k24 to the k26 on the dual knock motor

[Gerard <gerard@poboxes.com>]

Hi Bruce,

The motor I have is the MC with the single knock sensor, not dual.

[snip - something about hybrids]

Could you perhaps explain to me about hybrid turbos. I'm new to this
stuff.

[snip - something about Audi can in dual knock motor]

Once again, my machine is single knock sensor equipped.

> My k24 had a *bunch* of play in it, don't know if I would expect
> anything different from a high mile k26.  Have you done anything in 
> the way of an aftermarket ECU in your car?  That would probably [well
> , it was] be my first stop.  Probably see more smiles than just
> jumping up in turbo size when everything is stock.  I am happy with
> the IA box, although I am probably going to look around for more once
> my other mods are on and I have some baseline.

How  can I check for play on the turbo while still mounted to the
manifold? Play in turbo could be responsible for some of the rumbles
and hums I get from the motor.

As for ECU, I'm doing my own. Scott M. has helped me alot and I
currently have a code dump for the MAC13A ECU I run. I still need to
map boost curves to increase the boosting, but all will be done by me.
I currently run a simple EPROM copy on the car, the stock chip is
sitting in anti-static foam at my place. :)

So far I have learnt this about the K24 and K26:

	1. K24 works well in the lower compression Urq motors
	2. The K26 (or hybrid) will show more lag, but give better
	   high end performance on a higher compression motor
	3. Lag from the K26 is compensated for my the higher compression
	   ratio
	4. When lowering the CR, up the turbo size to compensate.
	   This is contrary to fitting the quicker spooling, smaller
	   K24 to the Urq with lower CR than the 200t. (see post from
	   Paul Timmerman)

Now before I go further with any (far off) future plans I am going to
go through the car again tonight and try and confirm the proper turbo
model. My knowledge of this South African thing has been gained from
this list, I will need to verify everything one more time as part
numbers matched to international pieces  indicate the 8.4 CR motor.

G.

G.
-- 
"a thousand miles from here, there is another person smiling"
1990 Turbo (200T)
name   : gerard van vught
tel    : +27-57-912 2658 (w) / 082 923 9609 (cell)
url    : http://www.acenet.co.za/homepages/gerard/
e-mail : gerard@poboxes.com  / han.solo@galaxycorp.com
         gerard@acenet.co.za / van_vught@frg.issi.co.za