Et Street Radials from Mickey Thompson.

 

What size?

 

Honestly I prefer the shorter tire with our stock 2.92 gearing. Really puts the RPMS in a good range throughout the 1/4mile and seems to make the car pull a little bit better, almost like it has 3.27 gears

I run 275/40/17 Nitto NT05R's and I have no problem hooking. Cut a 1.6 60' on them

 

What is your front wheel / tire size combo Troy? I just worry about the 1.5" difference in size.

 

GTO Skinnies, they wont fit your application, you're going to be limited with the brembo's

In you case it may look a little funny and possibly trigger an ABS fault but it shouldnt hurt anything (difference in height from front to rear)

 

If you run a shorter tire should you not retune the car to the new rear gear ratio that it has effectively created? Wouldn't it throw your shift points out of whack.

 

yea depending on where your limiter is at. Mine is tuned for optimum shifts with the drag pack on. Before I was banging the limiter on my 1-2 shift every time (street tuned with street rim/tires). Good point though

 

There is a little error allowed in the calibration so you can run 1 size bigger or smaller tires without too much problems. if the car is tuned, then the chances of pegging the rev limiter increase depending on how the tune was done.

I run 245/45/18's normally (26.7" tall), and 275/40/17 tires (25.7" tall) for the track and sometimes i leave them on for days or weeks. I have no issues reaching the rev limiter with 1.0" delta, i use the same tune for both, but tuned the shift points for the 245/45/18's tires, with the DR's, i'll hit my shift points within 30-50rpm more on the high side, for instance, before cam, my 1-2 shift was 6200rpm with the stock 18" tires, with the 17", the same shift happens at 6250rpm, the 2-3 shift is 6230rpm with 17" tires compared to 6200rpm with 18".

So depending on how the shift points are set up, you may or you may not hit the rev limiter with the same tune. 1" up or down from stock is still within the allowed size error. I just don't know how bigger or smaller you can go before running into actual shift point issues. (assuming the shift points in the calibrations are spot on for a particular tire size)

 

My other option would be to order a set of 18" wheels and tires for the front of the car. The guy at discount said that I could do some 235/45/18's and be within .5" of a 275-40-17, does this sound right?

 

By looking at willtheyfit.com it looks as if the front and rear would be 1.09" difference in Diameter. This is such a pain in the ass. Wish they made a usable 18" or 19" drag radial for our cars.

http://www.willtheyfit.com/index.ph...et=40&width2=275&aspect2=40&diameter2=17&wheelwidth2=9&offset2=40&Submit=Submit

Thanks for all the input so far from everyone.

 

Perry, why is this so much pain for you?. you should be ok with the 17" wheels (fit the GXP brakes), and 275/40/17 tires, run it an see how far or not you're from the rev limiter. if you reach the limiter, ask your tuner to fix it. i'd guess you were not concerned when you switched to those 20" wheels/tires , so why would you be concerned with the package that should actually give you more performance ?

 

I am just concerned about running 20" up front and 17" in the rear. Unfortunately, I bought the car with the 20" wheels and did not get the stock 19's. I wish I could of controlled that. I just want to see if I would be better off getting a 245/35/18 wheel tire combo up front for racing rather than running those big old clunkin' 20's in the front. It also make the car look goofy as hell.

 

Ill sell the 20's and get 4 18 or 19" wheels. Or if you want to try the same 17" gto wheels but in all 4 corners that should work too.

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Will the WS6 or GTO wheels clear the Brembo's?

 

There are 18" Drag Radial Options out there, 285/40/18. Those will be closer to your front OD.

 

Rawyzf. I just finished up at the tire shop. It looks like you are correct. I am hoping that they fit without rubbing. We are going to test-fit everything next week.

I went with 18 x 9" TSW wheels 24.0 lbs each and a NT05R Nitto 285 40 18.

Looks like it will be tight but I think it is going to work out just fine. (I Hope!)

Thanks everyone for your input!

 

You should be good. You may scrub on a large dip. But you're good for the track.


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Good choice on those 18x9 TSW's bet they will look good. It's time for me to order drag radials and 15x8 rears.

Going to go on a slight, maybe not, off topic. Didn't want to start a new thread about my conundrum when I don't belong lol so I'm leeching off this one since it's relevant.

What do you guys prefer for drag radials? I see some like the MT streets and some say the NT05R. Is there any that are preferable for driving to and from track so roughly 100+ miles that will last or better off just switching them at track.

 

Good question, because I am still trying to decide if I want to drive on them to the track or not. I hate leaving my good wheels and tires in the pits. Afraid someone will run off with them.

 

I can only speak to the MT ET street II's that I ran but they were awesome at the track. They dead hooked on the street too. I drove them to the track which could be 30miles or 80miles one way depending on the track I went to.

I see a lot of nitto guys complaining about traction when they get into the 11s, but the MT's don't seem to have an issue. This is just my track experiences though.

 

Gonna be hard to just run off with a set of wheels. I leave mine right beside the staging lanes as do others and never had an issue. Plus my back and wrench are all there too.

 

Good thing I'll never see 11's haha. The 8900 DA really puts a studder in our step.