Does anyone know the adresses for the MAF scalars and the highway mode fuel related stuff? I can't find a copy of $32B that has them listed.

 

Have you checked out the downloads on Moates? You can find the Hac there and use the info to modify the def file exactly how you want it. Or you could always upgrade to the 6E which already has all that in it.

ABTC_HAC.SRC
;--------------------------------------------------
;--------------------------------------------------
; HIWAY SPARK CONTROL
;
;--------------------------------------------------
LC17B FCB 120 ; IF COOL <= ,DISABLE HIWAY SPK MODE ((Val+ 40)*256/192)
LC17C FCB 100 ; IF LV8 > 100 ,DISABLE HIWAY MODE
LC17D FCB 36 ; IF RPM < 900 RPM DISABLE HIWAY MODE
LC17E FCB 5 ; IF CONDITIONS PRESENT > 5 SEC ,ENABLE
;--------------------------------------------------
;--------------------------------------------------
; HIGHWAY MODE SPARK ADVANCE vs LV8 (load)
;
; TBL = SA * (256/90)
;--------------------------------------------------
LC17F FCB 23 ; 8.0 32
LC180 FCB 23 ; 8.0 48
LC181 FCB 23 ; 8.0 64
LC182 FCB 11 ; 3.8 80
LC183 FCB 11 ; 3.8 96
LC184 FCB 0 ; 0.0 112
LC185 FCB 0 ; 0.0 128
LC186 FCB 0 ; 0.0 144
;--------------------------------------------------

Hope this helps, Randy

 

Cool, that'll save me some work. What about the scalars? Right now I'm using a v6 maf so I have to use $32B, but I plan to use an LT1 maf so would it be easier to stick with $32B or go to $6E?

 

After looking through the hack it doesn't appear that there are any highway mode fuel controls, just spark. What should I do about the scalars when I switch to the LT1 maf? It operates at a much higher frequency, would it even be possible to use it without a translator?

 

To use an LT1 MAF on a '7165 ECM without a translator would require a simple hardware mod and then an extensive code change. Low freq vs hi-freq MAF output.

The 32B code can use either a analog or low frequency input for the MAF. IIRC the $6E code can only use a analog MAF. There are pieces of freq MAF code in there, but from what I can tell the code can only use an analog MAF input.

RBob.

 

What would this hardware change be? And just how extensive would the code change be? I don't have any experience modifying source code yet, I'd like to learn it but it's a steep curve.

 

WHY? Unless you are making a LOT of HP and maxing the MAF, there is no real advantage to go to the LT1 MAF. And even if you DO max the MAF, all you have to do is tune via the P/E to add extra fuel. There are lots of guys making 500+ HP with the $6E MAF using that metod of tuning. Very simple to do.

As for the code change; you need to make the code handle more addressiblity than the stock 8bit address (256) used for the stock MAF.

It requires an entire re-write of the fueling routines. And, you have very little room in the chip to do it (16K chip limit...and it's already packed pretty tight). So even if you did make the source code changes to accomplish it, you probably will not be able to make it fit in the 16k space of the chip in the end.

Think of it this way, if it was easy to do - it would have been done a long time ago. People just find it easier to add extra fuel via the P/E fueling when they max the MAF in WOT.

 

I'm not making enough power to need it yet, but I will after my turbo build. I'm using the v6 maf right now so it's definately worthwhile to upgrade. I'm aware of PE tuning, but I figure I might as well upgrade to one of the better maf's out there since I'll have to do rewiring and programming anyway. It's $130 for a rebuilt LT1 maf vs $180 for a TPI + $30 for relays and much more wiring work. Could I just cut the old fueling stuff out and copy over the LT1 routines? It would be nice to make this work but it sounds like it's beyond what I can do.

Oh, and I'm using an Ostrich so space isn't a problem.