I'm familiar with that cam - it's the same one in my new 5.9L and the same
one I use on other builds I've done at the dealership. It also depends on
compression ratio and how much porting was done to the heads (flow
characteristics). Yes, it will run rich at idle due to the overlap - no way
around that unless you either custom program the PCM or run a fuel "tuning"
add-on.
Best combination I've found (yes, on a dealership Dyno and fuel curve
tuning) - AEM Piggy Back, 24# injectors, and an effective compression ratio
right close to 10:1. It's much easier to take away fuel% with larger
injectors than with smaller ones. The APEXi will help out quite a bit
though - it took care of my rich condition at idle on the old V6 (10.5:1,
.540" lift, 220 duration, and a lot of porting and CC work to the
heads)...even passed a sniffer test on our emissions machine (without the
cat - we were curious and had to check).
- Bernd
-----Original Message-----
From: Jamie Calder [mailto:JCalder3@cfl.rr.com]
Sent: Tuesday, March 18, 2008 8:08 PM
To: dakota-truck@dakota-truck.net
Subject: Re: DML: Fuel Mix Computer
Ray,
It's a '93 318, 30 over, Comp Cam 604 specs:
http://www.compcams.com/Technical/Search/CamDetails.asp?PartNumber=20-604-8
4bbl M1, ported throttle body, FMS 19# injectors, ported heads, MP PCM,
1.7:1 RR's...
Isn't it that cam that causes it to run rich at idle? It use to have a
couple hi flow cats but they got ruined within 1000 miles.
I'd like to have it run with the proper air/fuel mix. My brother in NJ will
be buying it from me and it will need to have cats installed. Sounds like a
piggyback fuel controller is the answer but I'm open to any suggestions.
Thanks for any help,
James
This archive was generated by hypermail 2b29 : Tue Apr 01 2008 - 00:20:40 EDT