kPa under boost

[Glen Beard]

Bruce Plecan wrote:
> 
> Your at way less then optimum, IMHO..  (Assuming this is MAP)...

I'm actually A MAF system, but I completely agree...  WAY less
than optimum.  I am just starting to open up the can'o'worms so
to speak on computer tuning.  I believe I am maxing out the stock
MAF sensor.  Above this, the computer (as I understand it) runs
like a MAP system.

>   Your fuel pressure regulator (FMU) will give a slight increase in fuel
> delivery.

The FMU is an 8:1 unit.  Take the base FP of around 45# and add
8# fuel for every one pound boost.  With the 6# blower pulleys I
see about 90-95# FP at 5800rpm.  Yes, I get a slight increase in
fuel delivery...

> But, the timing is constant from N/A to what ever level of boost your
> running.

I use a the Crane HI-6TR ignition that came with the Vortech
kit.  It has adjustable timing retard which I keep set to around
one degree of retard for every one pound of boost.  (Mostly for a
safety margin as the last time I ran it at zero, I broke
ringlands...)

I know that I have a real challenge ahead of me trying to tune
this to optimum, but I am learning more everyday I read the list
and archives.  With some patience, trail and error, and a little
luck I'll figure it out.


-- 
Glen Beard  95 T/A conv M6
355, Vortech, heads, cam...
http://home.nycap.rr.com/gbeard1/TransAm.html