tommypenguin

I'm currently making 730whp corrected as I'm over a mile above sea level. Uncorrected I'm making around 605whp. I'm running CCW SP20A wheels, they are 20 x 11 in the rear and 19 x 10 upfront. They fit perfect. There is probably 7-10k of rubber left on the tires but they don't have enough grip for my power level.

I've been researching tire replacement options and unfortunately there aren't really any good options for going fast in a straight line at this size. The other downsides are that the wheels are big and I would like to throw on a C6 Z06 BBK but can't fit up front due to the offset.

With that in mind I've been entertaining the idea of selling my wheels and purchasing a set of Cray Spider wheels in 19x11 rear and 18x10 up front or possibly TSW wheels. I know there is a difference in quality however I would be able to find a set of drag radials that fit if I drop down in size in addition to being able to clear the BBK. Given I just had a baby purchasing another set of CCWs or similar 4-5k set of wheels is not an option. My CCWs aren't in perfect condition with a couple of blemishes on the lip of two of the wheels, I reckon they would fetch somewhere between 2-2.5k and fund a good portion of the new wheels/tires.

My question is, would I be regretting the swap? Are there any other brands I could consider that would meet the mark for what I'm looking for at my price level? All opinions are welcome. A couple pics of my car for reference of my wheels. Thanks for your help.

neutron82

have you tried selling the rears only and replace them with a 19" rear?... you could try that or sell the whole set and get another set of ccw's, or just keep them if you can live with spinning

tommypenguin

I haven't considered just selling the rears since the front still would not clear a BBK. I could look for a used set of CCW in smaller size, but don't see a lot of sets pop up. Not happy about spinning which is one of the reasons that prompted the thread.

neutron82

ahh, I didn't see the part about c6z brakes... I have c6z brakes on my car with 505a's and if you get another set of ccw's you will probably end up losing an inch of lip on each wheel in order for them to clear, they still look good but to some that can be a deal breaker... and you very rarely see any for sale that are already set up to clear big brakes... I might be switching to classics myself if they end up releasing them in 19's... spinning does suck, some think it's cool but there's no point in adding all of that power if you can't have fun with it... if I was dead set on the brakes and in your situation I would probably sell your current set and buy another set... ccw's look so good and if you can afford them there aren't any others out there in that price range that I would want off the top of my head, just a personal preference

Evil-Twin

To the OP... you don't have any sidewall flex... those low profile tires are killing you... you need at least 5 inches of sidewall to be able to hook that much HP to the ground. You do not see low profile tires at any drag strip or at Indy, or in NASCAR. the reason is the sidewall acts like potential energy being absorbed through flex...much like a coil spring winding up and when released it emits kinetic energy. along with the energy of the engine. With that much HP you need 17 ( recommended or 18 inch wheels) at the most with a 50 % aspect ratio tire.

You need something like this Mickey Thomson streat radial in 17 inch. to get all of that HP to the ground.

Evil-Twin

those 20 inch tires with that 2 inch sidewall can not absorb any potential energy, so they can' t hook. the kinetic energy from the engine goes directly to the contact patch which it can not handle.

tommypenguin

Thanks for the suggest Evil-Twin. On 19's in the rear I was planning on running 315 35 19 in a mickey thompson drag radial, that would give me 4.33inches of sidewall up from 3.6inches on my current setup. What would be an ideal tire size on 18 that would fit on my coupe 315 40? Thanks for your help.

Evil-Twin

you asked how to hook that much HP... its not just the contact patch ( the width of the foot print).. you could put 355/30/ 19 on your car and it still would not hook. The sidewall has to release the energy kinetically.. the flex builds up the potential energy, so the release is more controlled. you need 5 inches of sidewall and the right amount of air pressure.. ( 8lbs/ / 9 pounds//10 lbs/ 11 lbs and you have adjustability in the tire to handle your HP.

You are trying to solve your problem with a band aide.. you are trying to use the wrong size wheel because you already have it.. and IM telling you it will not work.. you are only going to waste all that HP. You do not want to buy a serious wheel and serious tires for the serious HP you have. If your not serious about using that HP.. then put anything you want on your car..it will look nice, but you wasted a lot of money building a car with that much power.
My 345/35/19 tires have exactly 3 inches of sidewall and are 13 inches wide. I just measured them. I don't have your HP.

Evil-Twin

One other thing.. If you buy serious tires for your car that will bring that HP to the ground make sure you have hardened output shaft before you see what your car can actually do. Launching that car with the right hook and those stock shafts will be toast.

tommypenguin

Let me add some more information, right now I spin through second and the 4k on in 3rd. I want to go fast in a straight line but not from a launch in lieu of breaking the rear. I do have an ECS built rear end and upgraded clutch but I believe the shafts are stock, the rear is pretty much the only area of the car I haven't worked on aside from brakes and fluid flushes.

I rebuilt the motor over winter and with having the baby chances are that I won't have time to do a big project on the car in the form of a large repair for a long time.

In the 2 years I've owned the car I've only attempted to launch twice, no point given the setup and I don't want to break the car. I don't plan on taking my car to the strip either. Ideally, I would like to be able to go WOT in 2nd again on a straight from a roll with no spin. Is that a pipe dream with 315 35 19 mickey thompson street radial? I am trying to strike a balance between aesthetics and traction if possible. Thanks for your patience helping me make a decision that will most accommodate my goals.

FYRARMS

The M/T ET Street SS radial is available in a 305/35R19 size, which will offer a 4" sidewall and plenty of contact patch for the HP levels you are at. However, that tire is 28" tall. Make sure you have room, especially if your car is lowered.

Evil-Twin

With a baby you don't want to be spending a lot of money setting this car up to launch, and the potential to break things. Putting myself in your position think about this... HP and torque went put the ground could break your car... what you don't want at this time is to break your car with an unsupported rear end and shafts. If it was me.. I would be thankful for the spin...it keeps your car from breaking.. IN your position a set of M/T in that size would help and still keep you safe enough, but if you think you are going to stop the spin, that wont happen. The best case scenario might be that you wont spin in 3rd or fourth. You can still play around with tire pressure a little too. You might want to see what 20 psi will do for you.
Good luck with your toy.. and congrats on the baby. I have one coming in 4 weeks.. my 6th Grand kid, a boy ...gonna be named Gabriel.

FYRARMS

Tommypenguin, here is a modded CTS-V with nitrous making well over 600rwhp. He runs the 305/35R19 M/T SS radial and has zero wheelspin. 19" M/Ts + prepped drag strip = traction.

tommypenguin

Thanks guys, definitely am putting my wheels up for sale, will get a sale thread up on the forum soon.

neutron82

I have this exact tire on my car and oddly enough they are 26.75" tall installed on the car so I'm not sure why there is a discrepancy when compared to their website... it fits just fine, my rear brake ducts are already gone so if you have those they would probably have to come out... I had nt05r's in the same size on the car before hence why I had to remove the rear brake ducts, they are nearly identical in size compared to the mickeys... I am also lowered on coilovers but not slammed so I think the op will be ok judging by how his car sits in the pics he posted... you would be surprised how well 19's can handle power and from a roll you should be able to have fun but if you get serious about putting it on the strip then obviously the smaller the diameter wheel you can get the bigger the tire you can get but for a street car that isn't as desirable in my opinion

Evil-Twin

I have 345/35/19 rear tires on 19 X 13 CCW, the tires are 13 inches wide. My Z06 inner ducts are fully functional, and I also have 14 inch rotors.



New 345/35/19 Nitto on the left 13 inches wide...Old 305/35/19 on the right 11 inches wide



Here is a shot I took Yesterday morning showing the inner duct connected to the outer scoop. Fully Functional... Not taken for this reason but to compare my Carbon fiber quarters to the fiberglass quarters from the same manufacturer, in another thread. I said I would go out and take photo and post it.

neutron82

I've never seen a 345/35/19 invo, they do however make a 345/30/19 that are advertised a little over a half inch less in diameter than the tires we are talking about and the width of your wheels doesn't really matter seeing that the extra 2" is to the outside of the fender well... your tires on the inside of the fender will fit like a 305/30/19 would fit on an 11" wheel with stock fenders which I have had in the past and those cleared my brake ducts just fine... now add the extra aspect ratio and they start to rub... trust me, if they weren't touching I would have left them there

Evil-Twin

My Nitto's are 345/30 /19( I apologize for the incorrect size ) the wheels are 13 wide . I know the inside of the tire is in the same place as my 11 inch Michelins, and they fit my 14 inch rotors and brake ducts.