Stephen Belcher

.....

king awesome!

Yes they are and they help tremendously! You will need new rims because you do not want to drive on the street with them if possible. I went with the Hoosier R7's and mounted them on 18x13 and 18x11 Finspeeds. I lost 36 lbs in weight too.

dvandentop

also what do we know about the TPMS system? is it as intrusive as the c6z if you dont run them? also if you dont have tpms are you able to go into ptm sport modes? and what is the synch procedure?

Theta

Here's the answer to at least part of your question: (to do a proper learn, you will need an MDI or similar, and a TPMS activation tool)



Addendum to the above... As our TPMS are made by Schrader (I'll post one of my pics from swapping tire and wheels yesterday), but the Schrader magnet does not work, as Bill assumed.

The EL-50448 is the cheapest tool for activating the 125kHz learn circuits, so long as you have the proper tools as stated before (MDI/J-2534/GDS2).

For those without such tools, a dealer visit will be required. I don't think anyone would buy a $1000-$1500 tool for just this, but it's nice if you have one.

Bill Dearborn

Are you talking R compound DOT tires or true slicks which have a different carcass? There are a variety of used slicks available in 18 inch sizes from forum vendors such as GT Racing Tires.

Slicks are measured differently than DOT tires. They come with tire width in mm first, followed by diameter in mm and then rim size in inches. A 325/680/18 tire is equivalent to a 325 mm wide, 26.7 in diameter 18 inch tire or in other parlance ~ 325/35/18.

You can get reasonably good traction on a used tire with lots of life for $100/tire. Tire pressures might be an issue with the C7 TPMS since you start with cold pressures in the low 20s. At Sebring last year I was running 22 front and 20 rear cold pressures and at VIR I found that 2 psi all around worked better. The first session in the morning the car wanders around a lot until the pressures come up.

Bill

Bill Dearborn

I doubt the magnet will work. The SM section you quoted says each sensor has a low frequency coil and the tool broadcasts a low frequency signal to the coil in the sensor. That signal activates the sensor. The magnet won't work with that coil unless you can move your hand up and down at several megahertz to get the proper frequency so unless there is a provision in the sensor for using a magnet like the C5 sensors had then the magnet will not work.

Bill

Theta

Edited my previous post with results - Bill was correct regarding the magnet. Though Schrader claims that their magnet will work, I started a re-learn a few hours ago with zero success.

I ran with mixed-up TPMS sensors today (after getting the wheels/tires swapped over), and while I didn't get a light, the readings were incorrect (as expected).
.

Operations

I would like to know as well how close we have to stay with the oem tire diameters?

Stephen Belcher

Do you have any links for what I should purchase (exactly)? I'll go ahead and order. I can drive to laguna seca from my house on the slicks. It's only a few miles away .

I'll save tons of money too using these tires. Already went through a few sets of Michelins at $2k per set.

Stephen

Stephen Belcher

Are there any tires that will fit on the stock rims?

dvandentop

to learn the tpms i am sure can use the same tools as the c6 did now i dont see them mention hitting lock and unlock at same time like c6. i wonder if in the menus you can get it into learn mode?

dvandentop

i am sure it is pretty close to same ratio as the c6 was
seems like other using same sizes and z06 and zr1 for race slicks and sticky tires and no issues

dvandentop

daniel at finspeed will hook ya up. www.finspeed.com tell him the asian prince sent ya he will know who it is

Stephen Belcher

Ok, I just sent him a message

Anyone know if any slicks will fit the stock rims?

dvandentop

LOL nice love it. he will hook ya up

jvp

Unless GM has changed the C7's TPMS, they auto-learn. No tool is necessary at all. Just swap the wheels and go for a drive.

Theta

The tech document I posted earlier would seem to contradict that. May be the case, though.

king awesome!

i bought the Finspeed F110 (they are the F11's with 10 spokes instead of 11, saves weight) I did the RT option (-1 lb per wheel). I also did the knurled beat set because they are my track only wheels. I had them finished in ceramic satin bronze. Finspeed also provided and installed the TPMS sensors and mounted the Hoosiers R7's. 18x13 rear w/ 345/35/18 and 18x11 fronts w/ 315/30/18. Hope this helps. Here are some pics too.

Theta

Gorgeous!

king awesome!

thanks! it's a beast at the track. American racing headers and cat less x-pipe, halltech cknz intake and tune. I also added caravaggio stage 2 splitter and side skirts and had some custom made carbon fiber stage 2 wiglets for the rear. She is putting out about 750 HP and 775 tq. :yes nod: was the fastest thing at the track last week