Enabling MAT in 7427 $OE $OD etc

**brian617** · 12-12-2014

After a lot of searching I haven't come up with much info on adding MAT to TBI 7427 $OE. Searching through the parameters in Tuner Pro the only fuel based table I see is "MAT & CTS BLEND MULTIPLIER VS AIRFLOW". Right now this table is empty and the tips reads "Larger multiplier = more CTS blended into MAT". Few things I don't completely understand are what scale of values I can use, and If I'm at either end of those values what table is used for the actual fuel correction? If the MAT becomes the majority controller of fueling, does it assume one of the coolant based tables?

**1BadAction** · 12-12-2014

It will blend with or totally assume the fuel vs CTS table, which from what I recall is very coarse and minimal in its fueling adjustment range.

I think the MAT is a much better fuel modification strategy, but my question is how much it effects cold start tables, if any.

**brian617** · 12-12-2014

Open loop AFR vs Temp vs Vacuum?

From what I have read the CTS is still responsible for start up fueling.

**brian617** · 12-13-2014

Or maybe this table? "Inverse air density @ sea level vs blended intake temperature"?

**1BadAction** · 12-13-2014

I finally got to a computer where I could look at the parameters and I can't find the one I was talking about. If I do I'll post up, but right now I'm just as confused as you are... lol. Maybe it was in one of the hacks I was looking at.

**JeepsAndGuns** · 12-14-2014

I installed on on my MPFI $0D system and turned it on. There is some spark and fuel parameters for it. Simply look at a bin for a $0D CPI 4.3, they had MAT's and had them activated. I think I copied the tables/parameters from one of those bins and adjusted from there. Just use the parameter finder in tuner pro and search MAT. There are quite a few.
At the time I installed mine and was tuning it, I was having some unrelated issues (that I didnt know were unrelated at the time) and ended up turning it back off thinking it was the problem. I have since fixed the issue and keep thinking I need to turn it back on and see what I can do with it, but I am limited on time lately. I still have it installed in my intake and hooked up, just turned off in the bin.

**brian617** · 12-14-2014

[QUOTE=JeepsAndGuns;46508 Just use the parameter finder in tuner pro and search MAT. There are quite a few.[/QUOTE]

I did that, but I'm just not convinced there aren't more tables that would be responsible for fueling. The CTS/MAT blend table would basically be used to decide which one is in more control of the fuel correction. Question is, if the MAT becomes sole correction, which fuel table did it assume?

**JeepsAndGuns** · 12-15-2014

That question is beyond my knowledge. Hopefully someone that knows more about the code could help?

**brian617** · 12-15-2014

I guess I should mention the reasoning for adding the MAT and maybe someone could show me another way.

I'm having to change my idle VE table from summer temp to winter temps to keep my BLMs in check. I'm using a 195* thermostat so I'm only getting 5-8* coolant temperature degree changes at hot idle between the extremes of outside air temp. I do not have the provisions for the manifold heat to air cleaner as the heads I use raised the manifolds closer to the plugs and I ended up having to remove the heat shield.

After doing some reading on barometric pressure, altitude, water vapor and ambient temperature etc, I've considered using a BARO related table but I just cant seem to find the table that makes any sense to me to alter the fueling.