Guys, I'm at a loss right now
I procharged the car and it's been running great. TC hardly kicks in, due to the linear power curve. I went to the drag strip last weekend. Swapped to my DRs and was fine. Came home and swapped back to my street tires.
Just took the car out, for the first time since the strip, and TC is kicking in under the lightest of throttle input. I mean just normal driving with revs up to 3k and it's kicking in.

Any ideas? It's driving me nuts. It just kills power when it does this. Tires aren't spinning and streets were dry and warm.
I don't run tpms in any of my 6 wheels, and haven't for 6 months now.

 

Possibly from you switching all the tires and wheel set ups it may take a few hundred miles to re-learn the new tires, try driving it like a baby for 200 miles, just a thought but if not take it to your race shop, personally im keeping on my 18's always and my drag radial mickey thompsons . I only drive the car once in a while so i dont go through tires so for me it works

 

Any chance the pressure is low and the tire is spinning within the rim?

It's a $90,000 car. Pony up the $100 for a spare set of sensors!

 

It's my daily, so I don't want to put the wear on the MTs. I did think bout the fact that it may be learning new tires, but it's never don't this before

 

Pressure is spot on on all 4
I don't run sensors cause the drag wheels will throw a light for low pressure, and then it'll kick me out of PTM
The rule is all or none.

 

So I went for a drive and if I tap tc once, it let's the car drive normal without any cutting out. Once the car is warmed up, I can put it back to tc on, and it acts fine. So it's only doing crazy things while cold. WTF

 

This is a strange one.

I know the active handling and thereby the traction control self calibrate to the tires. This is done because the circumference of the tire is an important component in the overall calculations the system makes.

Point is if you had small od tires and went back to larger od tire I suspect the self cal would have to happen going both ways. I saw (caught it) this on my C6 only twice in 8 years. it took about 30 seconds. Perhaps this process takes longer before the car initiates the cal on a C7. Or perhaps without the TPMS's installed it isn't getting the temperature feed back and wont allow you to put down power until enough tire rotations have passed for it to self cal. Just a guess but who knows.

Also, you said it was warm out. However initially when you leave the house its not the outside temp but the temp of the tires being fairly cool that will allow a little slippage until you have driven a few minutes and they warm up. You said you aren't detecting any slippage so here again perhaps without the TPMS sensors there for initial temp maybe the default is tied to another temp like transmission temp, differential temp or ECT before the PCM will allow full power.

Just guessing but not much is known about how much influence the temp sensors have or what systems its tied to or what the defaults are it they aren't installed.

Regardless I would almost bet after a few hundred miles or so your problem fixes it self. These systems are pretty smart and well thought out to cover most anything we can throw at them.

 

Ya it's just crazy cause it never did it before. Changing to my DR was the difference

 

Fair enough, but that's a little contradictory. Your pressures are "spot on", so they can't be spinning in the rim, but also that you keep the pressure so low it would trip the sensors.

Did you mean you run low pressure at the track only, and it's still giving you grief on the streets at full pressure? That'd make sense, but I don't want to put words in your post...

 

Exactly. I only run low psi in my dr tires.
30psi in daily tires
18psi in the MT's