Brake Tap Grade Braking

[killerbee]

I have a tune with around 130 changed tables. I have somehow managed to disable the brake tap feature of the allison. No TCM adjustments have been made.

I post it here, in hopes of getting some ideas on the logic, to try and track it down. Obviously the lawn dart version will be time consuming. Any thoughts on what tables could do this...rationalle? I am trying to check each table against stock.

Also, can someone confirm that they have witnessed the tap down feature work ok with DSP tuning?

[cmitchell17]

Ive never even really had it come on on my 05 except if im going really fast in tow/haul and am hard on the break, but I don't have and mountians in Florida.

[MTN MAN]

:-)

[bballer182]

would it have anything to do with the negative (-) torque requests @ zero tps?

[killerbee]

It's a delphi tune.

[bballer182]

B1103 b1104 b1105

I'm just guessing?...

[killerbee]

the stock torque values are negative at 0 tps. And grade braking is not affected.

Logs show zero fuel being commanded. It was the first thing i checked for a logic snare.

I am sure it is probably something like this.

[bballer182]

Hmm... well you got me then. sorry

[Sparky8370]

I have a tune with around 130 changed tables. I have somehow managed to disable the brake tap feature of the allison. No TCM adjustments have been made.

I post it here, in hopes of getting some ideas on the logic, to try and track it down. Obviously the lawn dart version will be time consuming. Any thoughts on what tables could do this...rationalle? I am trying to check each table against stock.

Also, can someone confirm that they have witnessed the tap down feature work ok with DSP tuning?

Do you have the last tune where the grade braking worked? Can you compare that instead of each individual stock/modified table?

[DURAtotheMAX]

I wish we could make the grade braking a lot more aggressive, but it seems its a pretty complicated algorithm that relies on almost a dozen "stars to be aligned" before commanding a 'grade braking' downshift (as opposed to the standard 0% throttle downshift point)