Hello!
I've got a Commodore VX SS, with a fresh rebuilt lightly modded LS1 (RHS As Cast 205cc heads, 220/224 575" 112LSA Elgin cam, JE pistons) mated to a 2007 VXR8 6L80e, with the PCS TCM-2650 as the go-between.
The main issues I am having are as follows;
Transmission often sticks in 1st gear, sometimes in 2nd. The fix is either to take it from D to N and let the idle settle, then place it back in D (50/50 chance of it working afterwards), or a touch of brakes might get it to change into 2nd, 3rd etc.
The changes from 1 to 2 to 3 to 4 are all generally ok, but 4th to 5th is a flare and a dump into 5th. On a light throttle around town, it will mostly change up then down to 4th again. The PCS gear indicator plugged into the OBD port (and the readout on the laptop when connected to the PCS software) shows the transmission as flicking between 4 and 5 and also 5 and 6 at higher speeds.
The trans is getting and transmitting all its speed readings, but I haven't got the dashboard speedo reading properly as yet.
I unfortunately do not have access to HPT at the moment, but have attached a recent transmission log and the trans tune as it was originally. The one tuner I have visited so far found that the transmission is rapidly switching between normal and pattern a, even though I have no mode switches connected. He made both patterns the same, so that the trans would see no differences, but it didn't make that much difference. No obvious earthing issues either..... The harness is all new, but the gearbox is of course a total unknown.
normal-patern a.hpl
Jim at Zero Gravity is being really helpful, so I have the option to send him the TCM-2650 for testing. I'm wondering if I should send the TEHCM from the trans too....
Thanks in advance for any help and advice!
Michaels auto tune as read 18 03 22.hpt