Help with tuning stock truck

[joecar]

C,

I looked at your latest .tun file and I think your shift pressures are ok... if you feel like it, you can soften them up a little in the middle, but not if it softens the shift.

I think your low torque pressures are ok.

Your TR curves spike up in the middle... is that what you want (that will soften the shift where it spikes up)...?
Oh... copy your tow/haul TR tables to your normal TR tables, that would be fine.

Joe

[joecar]

I just tried it and it actually felt a little better. I put it in tow/haul where I have a lot less TR and it seemed to shift just as fast.

I have to go to work and once I get back ill datalog.

Reduce the amount of TR (see post #101) even in tow/hual mode...

The higher the TR curve, the more reduction will occur, and the softer the shift.

[cmitchell17]

I just reduced the TR when I left for work. The shifts feel like the hit harder like when it shifts you hear the engine rev down fast and hard.

I think we might be making progress.

I put the TR high because one time I tested it with little TR 5-10% it seemed like a really slow shift.

I have the tow/haul TR less so I can drive around but when I want to test the shift I can have little TR in tow/haul but still have a safe shift in normal mode.

Im going to go log it and test it again with a little less TR ill probably lower the force motor current another .015 again.

[joecar]

Ok... I see that you set D1207 to 100% and D1206 to 99%...

You may have to tweak the upper end of the PT upshift curves so that it shifts at the MPH/RPM you want... since now the WOT upshifts are being controlled by the PT upshift curves.

On my morning commute, I set my D1206 and D1207 both to 100% and it seems to be shifting purely from PT upshift curves; further experimenting on my evening commute (in a few minutes).

BTW: the Tune Tool shows the RPM's for a given MPH when you put the cursor on a cell in the PT shift tables.

[cmitchell17]

I think this next log explains what im feeling on the shift.

It feels like it slips for the first part of the shift then the pressure increase at the last part of the shift to speed it up.

I guess when I took off the WOT shift mode it made it shift a lot higher.

I accidentally logged some of the wrong PIDs.

Is the drop in pressure then the sudden increase a part of my problem.

For some wierd reason on the 1332 frame that shift chirped the tires a little, I dont no if it hit a bump or something the shift did not feel a lot diffrent, that was in tow/haul.

[joecar]

I don't see the log...?

What is TRQENG on the first part of the shift...?

[cmitchell17]

I need to go take one the last log I took I forgot to log engine torque. Im fixing to go out and take one.

Once else do I need to make sure I log?

234ftlbs 317nm right when the shift is commanded at 5600rpm.
286 388 as it falls to 4700rpm.
308 418 as it falls to 3800rpm.
304 412 as it goes to 3300rpm.
the rpm start to go back up to 3400rpm.

Ill get a log up as soon as I can.

[joecar]

At least these:

TRQENG
TFMPRS
GEAR
RPM
VSS
TP
SHIFTLAST
TCCMODE
DYNCYLAIR (expecting to be tracked by TRQENG)
TFT (just in case, if you haven't yet used 24 channels worth of pids).

[cmitchell17]

On my 1-2 shift I got a shifttime of .4 seconds, I pretty sure I was in tow/haul where I have the pressure come in sooner and less TR(5-10%).

The tires chirped again too but the shift felt good but smooth.

Look at frames 2300 Im pretty sure I was in tow/haul but its wierd becuase the rpms go up then like drop again or something, but my shift time was .4 seconds.

My internet is messing up im trying to post my attachment.....

[cmitchell17]

I cant post the attachment because everytime I try to post it it times out.

ill try again in a few minuets