4 Attachment(s)
LS Swap - E38/T42 powering LS2 and 4L80, no VSS no WOT shifting
Hi fellow tuners, I've hit a road block with this one. LS swaps are not my typical tuning challenges so bare with me. It's a 1987 cutlass with an LS2 and 4L80, powered by an E38 PCM from apparently a 2010 Camaro SS and a T42. Trans harness was repinned for a 4L80. Main problem is I don't have VSS. Not sure if it's tune related or a bad VSS, but assuming it's the tune what can I try and look for? The vehicle shifts during light load (which I'm surprised it shifts at all without VSS). WOT is absolutely terrible, cuts throttle somehwere past 5k RPM and to shift I have to lift for a second then I can WOT again and it will shift 1-2, same technique to make it shift WOT 2-3, and won't shift at all to 4th.
Tune and logs attached. Any insight would be helpful. I've told the shop to at least diagnose the VSS to see if it's bad or not, but I suspect it's tune settings. They're not strangers to LS/LT swaps and they've said this combination has worked for them in the past with their previous tuner.
PS: Not sure if this matters, but when I first got the old tune read from the controllers, it was originally set as a manual gearbox. Old tune and new tune attached. I've also put accurate tire size information, final drive, and correct gear ratios for the 4L80.