4L80E Shifting Soft and Slow (tune attached)

[LastCall]

I finally got the truck together and trying to get the trans to shift firmer on the 1-2 shift. It is shifting slow and soft, and wanted to try to firm it up. It is 3200 Precision Industries stall and I have a Transgo HD-2 Shift Kit installed. I am running COS5.

Any help would be greatly appreciated!!

[joecar]

Hi LC,

First off, fix these:


Out of Range calibration summary: 01:43:17 pm, Monday Dec 26, 2011

EFILive Custom Calibrations
{A0002} Octane Scaler Limiter, was out of range when loaded.
{A0004} MAP Disable TPS VE Table, was out of range when loaded.
{A0005} RPM Disable TPS VE Table, was out of range when loaded.
{A0006} TPS Disable TPS VE Table, was out of range when loaded.
{A0017} N20 Monitor VE Multiplier Table RPM Enable, was out of range when loaded.
{A0018} N20 Monitor VE Multiplier Table MAP Enable, was out of range when loaded.

[Taz]

Hello Lastcall,

Didn't go through your tune - just setup the base shift pressures - should spill your coffee now. Make sure to fix the out of range warnings - result of the COS upgrade.


Regards,
Taz

[joecar]

I agree with Taz, your shift pressure tables are low.


Also, it seems to me that your B0101 VE table is under-reporting airmass by a large amount (from 5% to 25% in most cells)...

this causes the PCM to under-calculate engine torque which causes it to under-calculate line pressure.

[LastCall]

Thanks for the help!!!

I am going to flash this tune in now... Which PID's should/can I log to show the shift times/slippage? I cleaned up the out of range cells in the custom OS.

As far as the VE table goes - The commanded and actual AFR are extremely close at WOT, so I would think the VE table is accurate. Am I missing something? Also, the sloppy shifts occur at WOT.

[LastCall]

Hello Lastcall,

Didn't go through your tune - just setup the base shift pressures - should spill your coffee now. Make sure to fix the out of range warnings - result of the COS upgrade.


Regards,
Taz
Loaded the tune and logged some of the trans parameters (see attached). Also fixed the out of range cells. BUT, the trans still shifted slow...

I agree with Taz, your shift pressure tables are low.


Also, it seems to me that your B0101 VE table is under-reporting airmass by a large amount (from 5% to 25% in most cells)...

this causes the PCM to under-calculate engine torque which causes it to under-calculate line pressure.
What areas are you referring to in the VE table? At WOT, I believe it using the boost ve table, but if I increase that, it will get more rich because the pcm thinks it's more airflow, right? I am open to any and all suggestions, just trying to understand this....

[joecar]

What engine do you have and what torque/power are you expecting it to make...?

Has your non-boost VE table been corrected...?
Has your MAF been corrected...?
If you see wideband BEN equal to 1.00+/-0.01 then your VE/MAF tables would be ok, and the problem would lie with the shift kit and/or the transmission.

Log these:
TRQENG
TFMPRS
DYNCYLAIR
DYNAIR

[LastCall]

What engine do you have and what torque/power are you expecting it to make...?

Has your non-boost VE table been corrected...?
Has your MAF been corrected...?
If you see wideband BEN equal to 1.00+/-0.01 then your VE/MAF tables would be ok, and the problem would lie with the shift kit and/or the transmission.

Log these:
TRQENG
TFMPRS
DYNCYLAIR
DYNAIR

I made 545/570 rear wheel on the dyno before removing the maf and going 2 bar speed density with a 4" intake.... LQ4 at 8# with supporting mods....

Yes, non boost ve table is close - less than 3% in almost all cells in the VE table.
I am not running a MAF

I will log the PID's above and attach the scans.

[LastCall]

I am still working on this... unfortunately.

I have copied an 04 force motor table which has helped with the 1-2 shift, but it is still slow. I have the shift times "zerod" out, but I thought there was a place in the tune where I can enable/disable adaptive shifting... Does anyone what table that is?

Also, what does table D1107 do? Mine is set to 205 KPA across the board.

[joecar]

You enable adaptive shifts by setting the shift times tables D1108,9,10 to non-zero... as an experiment, try setting these to 0.2s (yes even with your shift kit installed).

[LastCall]

You enable adaptive shifts by setting the shift times tables D1108,9,10 to non-zero... as an experiment, try setting these to 0.2s (yes even with your shift kit installed).

I set the shift times to .10 for the 1-2 shift and went for a ride... No change.

It doesn't seem like the transmission is slipping, just slow shifting. When it does shift, it is firm.

Could it be the shift solenoid? Any other ideas??

[Chevy366]

Depending on the size of the holes you drilled in the trans plate the TransGo kit should give you hard fast shifts for sure .
I did the middle sized holes and the trans shifted very hard and fast with stock trans parameters , there was no need to adjust from the stock settings .
All three holes were enlarged as pointed out in the kit instructions .
Let me put it this way , 1-2 shift would put down marks and felt like someone hit the rear bumper with a car .

[joecar]

You can try several things:
- set the Throttle Kickdown tables to all 100% in all cells (otherwise they can interefere with PT and WOT shifting);
- swap the two shift solenoids with each other.

+1 what Chevy366 said above.

[LastCall]

You can try several things:
- set the Throttle Kickdown tables to all 100% in all cells (otherwise they can interefere with PT and WOT shifting);
- swap the two shift solenoids with each other.

+1 what Chevy366 said above.

I will try both and report back... I am hope it is not the trans.

[slow67]

If they are GM/Delco solenoids, you won't be able to switch them.

[LastCall]

If they are GM/Delco solenoids, you won't be able to switch them.

I think they are the original ones that came with the trans, so I am assuming they are factory solenoids. I guess I should buy one and go from there.

[joecar]

Oh, I forgot that they may be different. :doh:

[slow67]

Oh, I forgot that they may be different. :doh:

Yeah some aftermarket solenoids are interchangeable, others aren't.

[Janke]

Im watching this thread because mine just recently started doing the exact same thing... shifting like mush. And you got the exact same setup I do.