the "0" on the flywheel

[John Cody Forbes]

tmb wrote:
> that's exactly what i'm wondering.  the car
> starts and runs MINT.  smooth idle, drives really
> nice, etc etc.
>
> it's some of the top end performance that doesn't
> feel right somehow.
>

Aha! I know what your problem is, again BTDT.

The stock turbo doesn't flow well enough for increased boost levels at high 
rpm. If you watch your analog gauge (you DID install one before turning up 
the boost right?) you should notice that while you are running 1.6bar (you 
did turn it up that high I assume) at mid range, the boost will drop off 
after ~4500rpm until arround ~5700rpm its down to about 1.0-1.1. Loosing 
.5bar boost make the top end feel like crap.

Also I had to port the hell out of my cyl head, IM and exhaust manifold to 
get my 10v to flow worth anything over 6500rpm. With the 10v the top end 
will never be quite as good as it should be, but with the right tricks you 
can get it pretty decent.

BTW/FYI - I'm not sure about the MC-2 since the compression is higher, but 
my MC-1 would take whatever boost the turbo would dish out when tuned right 
on 93 octane. With the exhaust system that means 1.6bar, without the exhaust 
after the downpipe it would run 1.8bar. That said, you are really waaaaaaay 
outside of what that turbo is designed for and on anything but a cold day 
it's pointless to run past ~1.4bar due to the turbo heating the charge past 
the acceptable limit. On a cold day the intercooler fixes this issue.

-Cody Forbes
http://www.5000tq.com
'86 5k noT noQ
'86 5k noT noQ - Parting Out
'87 5ktq
'87 5ktq - Fast. Really Fast.