Pappy60

I am looking at buying a C5 for 2014 B-street class.

Has anyone thought about the best wheel/tire combination in this class? Are the stock 17/18 wheels a good size, or is there something to be gained by 18/18 or 18/19?

(The Street rules allow a +/- 1" height allowance for wheels)

Also, what is a good entry level shock and sway setup for the C5?

I know the FRC is probably the best C5, but I want to get a convertible. Is there a certain package I should be looking for?

93Rubie

My honest opinion because I was considering switching to a C5 FRC for the proposed B-Street next season is if your REALLY serious. Get a FRC, it will be the lightest model and have all the go fast items ie. Z51 springs,etc...on it.

Tires and wheels: I would stick with stock wheels sizes because the needed tires (Rivals or ZII's) are available in sizes that fit the wheels.

Stock C5 tire front: P245/45/17 Height:25.6"
Stock C5 tire rear: P275/40/18 Height:26.7"

The sizes on stock wheels I would run:
Front: P255/40/17 Height:25"
Rear: P275/35/18 Height: 25.6"

FYI, tires from tire rack=Rivals $1,112/ZII's $1,116.

Not only does this lower the car a bit, which is a GOOD thing. It also helps with having a better overall gear ratio with the shorter tire. The C5 NEEDS this as it has poor gearing for auto-x.

The Rivals seem to have better lateral grip. The ZII's seem to be a bit better at putting down the power. Seems the ZII's where the tire of choice for many at 2013 Solo Nationals and is IMHO the better tires OVERALL.

IDK, on the sway bar. You can ONLY change one. Shocks are free. Call Sam Strano he knows C5's and could give you a sway bar and shocks package that will fit your needs. The C5 that won A-Stock this year was setup by him so....proof in the pudding.

If you still want the VERT, make sure you get a Z51 option on the car.

I had the sizes and such wrote down, I was on the fence about buying a C5 FRC, but decided to go thru my C4 and prep it for B-Street in a very serious manner. Fun to run something different, that and I can wear wider front tires than ANY C5 (Non-Z06) can.

Have fun, I ran my C4 this 2013 season on ZII's in 255/40/17's and as long as I drove it right, car was pretty good overall. Throttle control is necessary with street tires. ROLL down on the throttle for sure.

Pappy60

Thanks. The frc are really hard to find so at least a z51 pkg then.
I thought that you could go w 255 infront and a size wider in rear according to tr.
From resratch, the coupe and vert are 75 heavier, I suppose the coupe with top removed is prolly only 40 heavier.

The coupe may be better than vert because you have to get out to raise the top..no real advantage to the very.

How do you spot a z51? And whatis in that pkg. Conversion possible,?

hklvette

If you find an FRC, make sure its a 2000. They had a firmer suspension setup than the '99.

I don't remove the roof on my coupe for auto-x. I don't know if it affects performance, but the loss in chassis rigidity is noticeable.

The easiest way to spot a Z51 is the power steering cooler. They have a tube and fin setup, where the non-z51 cars have a "trombone tube" in the same place. You can see it behind and below the radiator stack from above, IIRC.

You can easily convert a non-z51 car to Z51. I did, and the hardest part was making sure that all of the components were year-correct. I used the springs (F&R), and rear swaybar from a 2000+ M6 Z51. I have all of that data available, just have to dig it up. The P.S. cooler is the same part number on the Z51 and C5Z, so that's easy to get. I used the C6 Z51 front sway bar, since its about the same size as the hotchkis bar that people like to use on C5s.

I'm not staying in BS, myself. I'm moving to STU if it gets approved. Someday I'd like to firm up the suspension more (T-1 or better) and put in headers, so it fits me perfectly.

Pappy60

To me, it looked like they were handing the new B-street to the C5, and it has got to be one of the most entertaining cars you can get south of 20K.

Is there a real concern it wont have enough tire to hold off an s2000?

Would the z06 in A-stock be a better choice? It gets (what) an inch more tire at each corner?

93Rubie

I don't think the idea of putting 405HP to the ground on street tires sounds fun. I'd stay with the regular C5.

If I had a C5Z I'd be running SSR.

Here is the 2000 FRC I had my eye on.
http://www.keystonecorvettes.com/ind...189-2000-black

I don't think a C5 should have any real trouble with S2000's Keep in mind the S2000CR got moved to AS or SS? I don't remember for sure. SO just regular S2000's/ MX-5 MSR's/Solstice ZOK to deal with.
To add further evidence Scott McHugh won A Stock in 2009 in a 89 C4 Z51 Corvette against S2000's. Granted that was on R-comps but so where the S2K's. Seeing as how C5's handle better than C4's I don't see an issue from a handling perspective. Granted, this all depends on driver skill, but we all knew that.

I like the STU proposal too.
I have a buddy with a STI that is pretty fast, he says AWD is overrated. While I tend to disagree somewhat, I agree with that statement too.

l2yeP

This car has everything you need plus the spares to run an R class in 2014 if you want

http://www.sccaforums.com/forums/aft/444476

rpuerzer

I have a 2002 C5 Z06 currently running in SS for scca. With the changes in classification for 2014, what class would I run in.

acrace

You can run it without any changes and with the R-compounds in "SSR". For 2014, SCCA will have both a Street and Street R (essentially the same as current Stock, complete with R-compound tires). For 2015 and beyond, only "SSR", which is the current Super Stock with the sticky tires, will be offered, and will continue to be offered as long as it is supported at the national level.

If you want to run it in the "Street" classes, on street tires, then A-Street for a C5 Z06.

rpuerzer

Thank you, I really appreciate your response.

Thanks,
Dick

avizandum

I have a set of Bilstein Sport shocks NIB I'd like to sell if interested.

acrace

Chris - remind me to talk to you about these tomorrow . . .

Cashmo

The latest published Street rules were in the June Fastrack.

The latest published Street classings (Appendix A) were in the August Fastrack.

The 2014 rule book should make things clearer but probably won't be out until January. For now, here's a link to the 2013 Solo rule book.