Even with similar throttle position, it shifts at 35mph like indicated sometimes, and others drags it out to 42 mph. I went so far as to set the shift point up at 35 mph all the way out to 60% or something, and it STILL does it. Let off gas completely when its over 35mph and it seems like it shifts every time - its like the TPS reading its seeing is skewed?
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
I don't know if it can somehow override the TPS based shift scheduling, someone with better understanding of tuning than me will have to chime in, but looking at this I notice that at 35 mph in the first series of upshift where it does not shift until 41 mph, the engine calculated load is 170 lb-ft or so while later on when it does upshift at 35 mph the calculated load is only 115 lb-ft. The throttle is open 2% less but I would not think that would make the calculated load so different. The MAF reading at the same engine RPM is drastically different between the two, I am no engine guy, but that strikes me as abnormal with only 2% throttle opening difference. Sorry not much help, but I figured I would mention that in case it is somehow relevant to your issue.
Last edited by TransGo Robert; 10-25-2024 at 05:00 PM. Reason: Added MAF observation
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Also notice, at 56% throttle, it's shifting into 4th before 3rd.
Might be a non-issue. Chance it might confuse the computer?
Doesn't happen at the TPS% where it crosses, so probably not related..
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Last edited by mikez71; 10-25-2024 at 10:40 PM.
Yeah, that's not right. Good spotting
Good spot, will fix, but still at loss on the original problem
Factory Stock 97 SS M6 13.51 @ 104.3 mph
Stock Longblock LS1 w/ 233/238 P.S.I. Cam
10.81 @ 126.9 Full interior, six speed on 275 radials, a decade ago
'99 TA trunk mounted 76mm 6 Liter
9.0s in '09 @ 153 MPH
Turbo 5.3 Volvo 740 Wagon
32psi and still winding out 5th on the highway somewhere
Use the bluecat tool.
Really the difference between each mm is important to create movement. I think maybe use bluecat tool.
Last edited by netdingdong; 12-12-2024 at 07:13 PM.
geometry dash
Oil and gas Operator Hilpert-Shields 3032 Hahn River
Well as Heraclitus said a man never steps in the same mm twice, so you may have a point there.Originally Posted by netdingdong
Does your TCM and ECM Vehicle speed match?
Was tooning a truck the other night that had some weird shifting issues after somebody had "tooned" it for the guy.
Ended up finding the ECM/TCM speeds were about 19mph off from each other. Fixed that and then redid the trans toon and everything started coming together.
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