[Shotimes] Pro-m 77 on an ATX?

[Adam Parrott]

While it is true that all of the 55mm MAFs themselves are identical, not
all of the PCMs which made use of the 55mm MAF are programmed with the same
transfer function.  Case in point would be the X2J, which uses a curve
different from both the D4U1 and "corporate" A9L 5.0 Mustang curve -
something you wouldn't normally expect since all three use the same MAF.

I stand corrected by Bill Bryer's comments, however, and must apologize for
the half-awake posting I made earlier.  The fact that Pro-M bases their
calibrations on the same factory 55mm curve means that one should be able
to freely swap MAFs between an MTX car and an ATX car with no problem
(contrary to what I noted in my earlier posting).  Any differences in
transfer function on the PCM side wouldn't matter since the MAFs themselves
are all calibrated to the same curve, and the PCM would account for this
change via it's programming (as it does with the X2J's injector slopes).

Anybody have a "foot stuck in my mouth" smiley?  :)

Adam


----- Original Message ----- 
From: "Dave Kegel" <d.kegel@comcast.net>
To: <shotimes@autox.team.net>
Sent: Saturday, September 11, 2004 3:44 PM
Subject: RE: [Shotimes] Pro-m 77 on an ATX?


What makes you think they are dissimilar?  As far as I know, the
transfer functions are the same between all the computers.  And the 55mm
MAFs are all the same as well.

Dave Kegel

-----Original Message-----
From: shotimes-admin@autox.team.net
[mailto:shotimes-admin@autox.team.net] On Behalf Of Adam Parrott
Sent: Saturday, September 11, 2004 1:21 PM
To: shotimes@autox.team.net
Subject: Re: [Shotimes] Pro-m 77 on an ATX?


Ian,

Since the ATX and MTX transfer functions are quite dissimiliar, I highly
doubt that your MTX-calibrated Pro-M 77 will work correctly on any ATX
car without reprogramming.  To be sure, I would first test the MAF on a
stock ATX car and see how it responds (both at idle and during a test
drive).  My guess is that the car will both idle rough and/or run
extremely lean.

Let us know what you find out.  :)

Adam