Lean AFR after shifts, ECU still removing fuel - Scout II 345 V8 Holley C950

**jeepmb** · 11-25-2015

Thanks riche, I agree on the idea for modifying acceleration enrichment, as it is going lean right after I roll on the throttle after shifts. Before I make any changes though I wanted to see if it's a normal occurrence, but it doesnt sound like it.

**Skinny Pedal** · 11-26-2015

Load goes up as you upshift. Where was the tune built load wise? By that I mean in what gear. If the VE table is correct then AE would be the next place.

**jeepmb** · 11-26-2015

Sorry, Ive only worked with the C950 system not the new stuff, not sure what VE is. Vacuum Enhancement?

As far as tune, this system has no self-tuning, and there was never an IH base map, so its been tuned by driving up a hill in every gear and taking datalogs while changing values by hand.

My real challenge here is trying to modify my AE tables without making the throttle jumpy. I have no way to datalog AE so its kinda just guess and check.

**riche** · 11-26-2015

Yeah he means volumetric efficiency table. Holley calls it a base fuel table. The new one is in injector pound hour not sure about your software. I think he is trying to tell you to check your table in the load are and see if you can tweek it.
Holley is funny tho. Don't try to tune your table for AE stuff make sure it is good cruising and under loads. Then modify the AE stuff to help with any shortcomings.
Doesnt the commander have a closed loop mode with an air fuel ratio table?

**jeepmb** · 11-28-2015

So after looking at my base fuel map, and re-examining modifiers I think I found part of the issue. When I looked at my Acceleration Enrichment vs Coolant Temperature instead of being numbers like 100, 102, 107 (%'s), it was numbers like 17, 19, 25 where it didnt before

. Also, I have recently found other modifier tables showing COMPLETELY different values than I had left them. Like a lot. It's really infuriating and I have no idea why it is happening or what to do about it.

Otherwise, after correcting those values some points in my AE table could use enrichment after shifts, but I still havent figured out how to calculate where to change the values, as it only list SLOW or FAST. Below is what I'm working with:

Attachment 9884

**riche** · 11-30-2015

I would always keep some dummy base tune files to go back and check settings when things get all out of wack. Holley usually has decent base tunes for AUTOMATIC transmissions. Most guys with standards usually end up hating the system until the get all the bugs worked out.
I get what you are saying about being frustrated, nothing is more aggravating than things not being the way you left them.
With that being said get some numbers that halfway make sense with the AE vs temp back in the table. Then I would switch gears to AE vs TPS and the AE vs MAP.
There may be some info in the manual about haw those numbers work. Im with you, they really don't make sense to me.
For instance in the AE correction vs TPS %. the bottom number is 15,31,47,63... is this TPS % if so then wouldn't the 100's in the top column have to change. they can't be the same amount. In my mind that would mean there is no change.
In the pic I attached you can see the TPS % and then the fuel pound hr. change as the TPS rate increases.
You also could got to holleys forum. Danny over there knows this stuff... He can help, but you have to be patient b/c he is very detailed oriented. He will also probably tell you that you need to buy the new system. lol

This might sound crazy but you could turn off closed loop and see if things go way out of wack... If they do then you know that you still have issues with your base fuel table.