I have 2 cars that are doing this.
Then the car is at WOT, the 1-2 Shift is set at 37mph and 6100 RPM, the 2-3 is set at 71mph and 6000.
The Problem is that the 1-2 shift is happening at @42mph BUT 5900 RPM, the 2-3 is at about 74 and dead on 6000.
What is causing the car to not shift ar the programmed 1-2 6100 RPM?
This is happening in both cars. one is a 98 the other is a 2001.
98 TransAm WS9 Raim Air – Stage 4 4L60E Trans -3:90 Rear -1.8 HS Rockers - Full UMI Suspension – 85MM Lid – 85MM Z06 MAF - LS6 Z06 Intake - 224/230 Comp Cam - 7.350 Push Rods - 243 TEA Stage 2 LS6 Heads 61cc - Melling 10296 Oil Pump - Caddy Race Lifters - SLP Underdrive Pulley - 160 Thermo - 42# Green Top Injectors - HPT - SLP Line lock - Pacesetter LTube Headers - Yank SS4000 - 98 to 2002 PCM Swap www.mrk-motorsports.com
Sounds like the speedo calc might be off a bit. Can/have you checked it with a GPS?
Always Support Our Troops!
Even if the Speedo was off a little it still isnt shifting at the Correct 1-2 RPM, it is Shifting at the other 2-3 RPM and the 3-4 RPM if I enable it.
98 TransAm WS9 Raim Air – Stage 4 4L60E Trans -3:90 Rear -1.8 HS Rockers - Full UMI Suspension – 85MM Lid – 85MM Z06 MAF - LS6 Z06 Intake - 224/230 Comp Cam - 7.350 Push Rods - 243 TEA Stage 2 LS6 Heads 61cc - Melling 10296 Oil Pump - Caddy Race Lifters - SLP Underdrive Pulley - 160 Thermo - 42# Green Top Injectors - HPT - SLP Line lock - Pacesetter LTube Headers - Yank SS4000 - 98 to 2002 PCM Swap www.mrk-motorsports.com
Don't forget there is a time factor in there with the auto transmissions hydraulics.
Also some of the combinations end up pretty much MPH only for some reason, the RPM component doesn't seem to work as well. See if you can get the commanded shiftpoints working in MPH first then adjust RPM.
I don't know why this is the case but it is in some operating systems.
Always Support Our Troops!
post ur tune
That is the 4L60E for you, good luck trying to get it to shift when you want. Some cars do and some don't. I have tried to command strictly off MPH and RPM and some cars the shifting error can be about 400 RPM. With a stock cam, not sure I would be shifting that high anyway as the power falls off quickly.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
Here's another funny one, Trac on 1-2 shift 6000rpm, trac off 1-2 shift 6400, wtf....not a real problem, it just catches u out somtimes.. I noticed it after installing the RTT os.
Mine shifts a little different each time. I have 1-2 set for 6300/41 MPH, most of the time it does that...then every once in a while it will shift at 6700 RPM. No idea unless the trans is slipping and RPM's come up before MPH does.
Strange but here is one of the tunes.
98 TransAm WS9 Raim Air – Stage 4 4L60E Trans -3:90 Rear -1.8 HS Rockers - Full UMI Suspension – 85MM Lid – 85MM Z06 MAF - LS6 Z06 Intake - 224/230 Comp Cam - 7.350 Push Rods - 243 TEA Stage 2 LS6 Heads 61cc - Melling 10296 Oil Pump - Caddy Race Lifters - SLP Underdrive Pulley - 160 Thermo - 42# Green Top Injectors - HPT - SLP Line lock - Pacesetter LTube Headers - Yank SS4000 - 98 to 2002 PCM Swap www.mrk-motorsports.com
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