efi mixture settings

[Alan Pritchard]

Thanks jim, I wont be dynoing the car, so the little difference in power
will not be easy to feel. Hence a sensible figure to aim for. Obviously a
boosted car requires richer fuelling, than I will need, so stoich could
easily be safe on my na engine, although I would be inclined to slightly
enrichen it. Saying that I plan to go full wideband and possibly set it up
to run full time closed loop, after setting the car up as good as possible
using wb feedback.
Just waiting for my manifold to butcher!!!


Best Regards,

Alan Pritchard,
Mechanical design engineer,
Network administrator.

Seaeye Marine LTD.
+44 (0)1329 289000
www.Seaeye.com

 -----Original Message-----
From: 	Jim Green [mailto:jeg1976 at yahoo.com] 
Sent:	19 February 2004 15:10
To:	Alan Pritchard; Quattro List (E-mail)
Subject:	Re: efi mixture settings


--- Alan Pritchard <apritchard at seaeye.com> wrote:
> Ok....
> I am still working on my megasquirt project for my
> 90q.  
> Just wondering if you other efi guys have come up
> with a nice safe
> stoichiometric value for the na 5 cyl engines (9.6
> cr on my frankenmotor).
> Ie 14.7 being stoich, while a value of 13 could be
> best for power, but
> between the 2 is a nice safe value that the 5 cyl
> engines will like.
> Any btdt?

Anything between the two will be safe, and you
probably will not notice any difference unless you're
on a dyno.  You might as well shoot for the best
economy.  I tuned mine for 12:1 on the dyno at full
boost, and even brought a few area's above 20 psi down
to 11:1 because of the EGT's I was getting.  Even
after that I didn't have any drop in power.  

For your car I'd shoot for stoich everywhere except
the WOT, low vacuum areas ~1bar and high rpms, then
give it a little extra gas.  On my autometer a/f gauge
when my car was stock, WOT was the first two green
LED's.  I'd hook one of these up and see what you car
does now, then try and duplicate it with the efi.

HTH,

=====
Jim Green
'89 90tq
'89 80q
http://www.mswanson.com/~jgreen/car_home.html

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