I have an F-Body that I am doing a 4L80E conversion on and trying to control the shift points with the stock PCM. I have a Spearco harness, vacuum modulation on the line pressure, and a Transgo shift kit. I am using EFILive FlashScan and copied the trans cals from a truck over to the F-Body tune. My problem is that the computer is not properly controlling the shifts at all times and I think it may be in the calibrations compatibility.

Anyone out there with a F-Body/4L80E conversion working off of the stock PCM that would be willing to send me a tune file so I can see what is going wrong here? If so, please send the file to BLK02WS6@aol.com

Thanks in advance for any help!!

 

I know on mine, I had to email HPtuners my tune and they modified the operating system so that my stock PCM would control the 4l80e. I have not tested to see if it works but Im sure it will.

 

The vacuum modulation screws with the commanded shift points. I had to play around with mine a lot to get them to shift where I want them to. It's not a problem with the tune, you'll just have to experiment a little and see what commanded shift points give you the actual shift points you want.

Example: My 1-2 shift is set somewhere around 49 mph and 5900 RPM and I actually shift at somewhere around 60mph and 6300 RPM, 2-3 is even more different, etc etc

I'll post my shift tables when I get home from work later.

 

Thanks man! Appreciate it.

 

LABELS
Parameters Value
{D0910} WOT 1->2 Shift Speeds, Normal 52.000000 MPH
{D0911} WOT 1->2 Shift Speeds, Performance 52.000000 MPH
{D0912} WOT 1->2 Shift Speeds, Hot 52.000000 MPH
{D0913} Manual Hold Gear, 1st, 1->2 Shift Speeds 255.000000 MPH
{D0915} WOT 2->3 Shift Speeds, Normal 86.000000 MPH
{D0916} WOT 2->3 Shift Speeds, Performance 86.000000 MPH
{D0917} WOT 2->3 Shift Speeds, Hot 86.000000 MPH
{D0918} Manual Hold Gear, 1st, 2->3 Shift Speeds 255.000000 MPH
{D0919} Manual Hold Gear, 2nd, 2->3 Shift Speeds 255.000000 MPH
{D0920} WOT 3->4 Shift Speeds, Normal 255.000000 MPH
{D0921} WOT 3->4 Shift Speeds, Performance 255.000000 MPH
{D0922} WOT 3->4 Shift Speeds, Hot 255.000000 MPH

LABELS
Parameters Value
{D0925} WOT 2->1 Shift Speeds, Normal 49.000000 MPH
{D0926} WOT 2->1 Shift Speeds, Performance 49.000000 MPH
{D0927} WOT 2->1 Shift Speeds, Hot 49.000000 MPH
{D0928} Manual Downshift 2->1 Shift Speed 49.000000 MPH
{D0930} WOT 3->2 Shift Speeds, Normal 85.000000 MPH
{D0931} WOT 3->2 Shift Speeds, Performance 85.000000 MPH
{D0932} WOT 3->2 Shift Speeds, Hot 85.000000 MPH
{D0933} Manual Downshift Gear 3->2 Shift Speeds 85.000000 MPH
{D0935} WOT 4->3 Shift Speeds, Normal 140.000000 MPH
{D0936} WOT 4->3 Shift Speeds, Performance 140.000000 MPH
{D0937} WOT 4->3 Shift Speeds, Hot 140.000000 MPH

LABELS
Parameters Value
{D0940} WOT 1->2 Shift RPM, Normal 5900.000000 RPM
{D0941} WOT 1->2 Shift RPM, Performance 5900.000000 RPM
{D0942} WOT 1->2 Shift RPM, Hot 5900.000000 RPM
{D0945} WOT 2->3 Shift RPM, Normal 5300.000000 RPM
{D0946} WOT 2->3 Shift RPM, Performance 5300.000000 RPM
{D0947} WOT 2->3 Shift RPM, Hot 5300.000000 RPM
{D0950} WOT 3->4 Shift RPM, Normal 5700.000000 RPM
{D0951} WOT 3->4 Shift RPM, Performance 5700.000000 RPM
{D0952} WOT 3->4 Shift RPM, Hot 5700.000000 RPM



The above settings give me 6300 RPM 1-2 shifts, 6200 RPM 2-3 shift, and I'm assuming a 6100 3-4 shift but I haven't been quite that fast

Also keeps the downshifts in about the right place. Give these a shot and see how they work for you, then do some tweaking on them to see if you can get what you want out of them.

 

Thanks - I'll give em a try!

 

My part throttle shift points are spot on but havent gotten to test WOT shifts yet on a good tire. Sometimes i can floor it and BOOM...right to the rev limiter because it spins. My 4l60s always did that...rev limiter on street tires, perfect shifts on slicks.