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Discussion Starter #1 (Edited)
As some of you know, throwing on some drag radials without TPMS sensors will eventually cause the car to light up the TPMS malfunction indicator lamp (after about 20 miles of driving) and then completely lock you out of PTM modes and launch control. Additionally, you will not be able to hold down the traction control button to turn everything off (both TC and Stabilitrak). Thankfully, the engineers kept us drag racers in mind and threw in an undocumented mode for us to use in this scenario.

To re-enable PTM modes and launch control AFTER your TPMS MIL is on:

1. With the engine running and the car in park, engage the electronic parking brake.
2. Press your traction control button 6 times (if you do it too fast or too slow it won't work).
3. Once the messages in your dash catch up to the 6 button presses, then hold down the traction control button for around 5 seconds.

Result: You'll see both the TC and Stabilitrak lights come on and you can now enter PTM modes, use launch control, or turn everything off.

While your TPMS MIL is active, you'll need to perform this procedure every ignition cycle.

I had some fun testing this on street today once I finally got around to throwing on the welds from my V2. They were color matched for the V3 and fit perfectly. I'm currently running 295/45R17 MT ET Street IIs on them. They are pretty close to the stock overall diameter (27.1 vs 26 inch) and don't seem to cause any weird traction/computer issues (tested numerous times up to 140ish). I think they fill the gaps perfectly.... not a bad looking setup for when I take it to the track....
 

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Great info thanks for sharing, Wheels look nice and tight.
 

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Sweet, this is good news.
 

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Good thing I got a pair in the shed with good tread left and a friend with 17 inch welds. :)
 

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Discussion Starter #7
Unfortunately they don't make that tire or that size in any tire any longer.
Yeah I'm pissed the newer MT SS or Rs don't come in a 26inch size that I would want on my 17 welds. If I want a 26 in the future I'd have to go 275 as I don't think the 325s will fit. :(
 

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good post rising to the top.
I heard you can have some spare TPMS sensors in a pvc tube with caps . presserize to 35lbs and that should work too. but this option is good too. Thank you. I printed out to have at the track.. somtimes chaos if Im and the front and they call your line... Turning on gopro's, hptuners, traction control etc...
 

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Discussion Starter #9
FYI I tried another solution and it is working very well so far. I ordered the 'TPMS Delete' box on ebay for Cadillacs. It ships from Canada for around $107US. It is a small little 3D printed box with a circuit inside that mimics the tpms sensor signals and will set them all to 34psi. You put the car in tpms learn mode and the box takes cares of the rest. You then leave the box in your car and it comes with a usb charger cable that you can have plugged in at all times if you want (I leave it hooked up in the center console). For me, I wanted the 2 front stock sensors to remain working so I bought the $9 tpms relearn tool from amazon. I put the car in tpms learn mode, used the tool from amazon to relearn the front 2 sensors, then brought the TPMS Delete box close to the car and it picked up the back 2 'fake' signals.
 
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