Preventing money shift in TU/TD

[NoStepOnSnek]

2013 Caprice. E38/T43. Installed a shift box in it. It's working well. My question is, what table if any can you lock out certain downshifts to prevent a manual mode downshift from say 4th to 1st at 1,000,000 RPMs. It's my son's car and I want to make sure the car is protected against overzealous downshift presses. I see some tables but none of them "appear" to do what I'm after. Unless there's logic knowing that a 2>1 downshift request at 50 MPH isn't allowed and just locks it out since my 1st gear WOT 1>2 shift is south of 40 MPH. Or should I copy my shift schedule from the other tables minus some MPH?

[hjtrbo]

You mean a tap shift switch box?

If yes, the protection is built in. The mph down shift inhibit values are in the background tables.

[NoStepOnSnek]

Yeah. So you're saying that my down shift tables are being crosschecked with live MPH and that's how it prevents an issue.

[hjtrbo]

The downshift lock out tables are hidden. The vss settings must be correct. Try it out, do 4000rpm in 3rd and initiate a downshift to 2nd. It won't do it.



In my cal the values for the TUTD shift lock outs are (km/h):
2->1 38
3->2 68
4->3 120
5->4 167
6->5 237

[mikez71]

This won't do it? It was set to 3,000 rpm on my 2012 Tahoe, set at 5,500 rpm on the '15 tahoe..
Have not tested..
shiftrpm.jpg