Need help with trans tuning..

[BowlingSS]

My A-4 trans. went bad after 53K miles. I had a 3600 stall put in over 5 years ago. I did get some help on tuning it back then but that was a long time again. The trans was built by FLT will all the good stuff. I put a new 3500 stall back in. I changed my trans pressure back to stock as the trans builder said to do. The rest I have not changed. Can someone look over my tune to see what they think? I am running SD with no MAF. I do all my tuning with a WB. I am running COS5.

Thanks.
Bill

[joecar]

Hi Bill,

It looks good to me...

I understand Vince at FLT builds them to work with the stock pressure and time settings.

Also, do this, log GM.TRQENG and check that it looks sensible and not low... when running SD if the VE table is too low the calculated TRQENG will be too low... the PCM computes base pressure from this, and the shift pressure table axises use this pid.

You might try adding a little torque reduction back in there... how is shift feel...?

[BowlingSS]

Hi Bill,

It looks good to me...

I understand Vince at FLT builds them to work with the stock pressure and time settings.

Also, do this, log GM.TRQENG and check that it looks sensible and not low... when running SD if the VE table is too low the calculated TRQENG will be too low... the PCM computes base pressure from this, and the shift pressure table axises use this pid.

You might try adding a little torque reduction back in there... how is shift feel...?

Thanks Joe. I will add this PID. How low is bad? Is there a Map already for this PID or do I need to create one? TRQENG Vs ??.
The shift feels pretty good but 1-2 is a little harder than before.

Bill

[joecar]

Make the map the same as the shift pressure tables...

With scantool->tunetool pid linking, watch as TRQENG indexes the shift tables during a shift...

Also, during steady gear, TRQENG should follow TPS and MAP... i.e. it should rise significantly at large throttle.

[BowlingSS]

Thanks Joe.

Bill