Tires.... - Toyota Nation Forum : Toyota Car and Truck Forums

EvoFire · 03-09-2007, 06:35 PM

I've been getting into AutoXing lately on my Gen 3 car. I came across some one at an AutoX which can secure me a set of R compound Kumhos. I have a set of 17in rims I can use for the street so I'm thinking of removing the tires on the stock 15in rims and putting R's on them.

Now the question is should I stick with OEm size tire or maybe I can go shorter for lower rolling diameter, or increase the width or whatever. Anyone with more expertise can help me? I'm also wondering if there is a possibility of too much tire for a car.

And yes, these R compounds will be strictly racing only, there will be little to no street use.

touringcamry · 03-09-2007, 06:45 PM

If you are strictly using the tires for autoX, you might consider getting lower profile tires to shrink the overall diameter of the wheels.

Since autoX usually takes place at lower speeds, the smaller profile will help you shorten your gear ratios so that you can accelerate faster.

EvoFire · 03-09-2007, 06:53 PM

how much lower should I go though? The stock tire is 205/65/15, I'm also a bit worried about the car rubbing the ground when it corners cause it rolls so much. There are Porsche 944s there on stock suspension that are rubbing the ground when they corner.

bigbird · 03-10-2007, 12:47 PM

id say about 55 sidewall would be ok, the bump stops whoud keep ya from rubbing.

Axel Kain · 03-10-2007, 02:52 PM

but if you lower the tire height, how will the bump stops compensate for whatever height change the shorter tire will make?

get new swaybars btw.

bigbird · 03-10-2007, 04:31 PM

my old camry had a 2 inch drop and stock shocks which can equate to a drop in tire height roughly and when i throw it into turns it has never rubbed and i mean HARD turns. i felt the car hitting the bumpstops but it never rubbed. the car will tip over before it hits the ground, lets hope that doesnt happen

. the big question is are u lowered? in that case a significant drop in tire size(65 down to 45) might cause problems.

EvoFire · 03-10-2007, 04:47 PM

Nope, not lowered, don't have money in the mean time either. I will be pretty broke after tires.

bigbird · 03-10-2007, 04:57 PM

u should be fine then. ive seen friends try to autox after droppin and getting a lower than OEM rolling diameter. needless to say they had to repaint some pieces

EvoFire · 03-10-2007, 05:23 PM

hahaha. I'm not lowered, and hopefully that's good enough for me not to scrape.

touringcamry · 03-10-2007, 08:22 PM

You could get 215/55/15 instead of 205/55/15. That's still smaller than stock, but bigger than the 205/55/15. The extra width might help in the corners too.

Axel Kain · 03-11-2007, 12:46 AM

when you say 2" drop, relating to springs right. you could ride on the bump stops, and not scrape, but a shorter tire has nothing to do with suspension travel, shorter tire just puts your suspension lower, your car also but whatever, i see it as, you lean to the bump stops...ok, but if you lower the bump stops, with a shorter tire, you may hit the body.

although i may seem an ass, im just arguing my point... personally id recommend using th emiata tire calculator (google/yahoo it), and figure how much difference you will get.

EvoFire · 03-12-2007, 06:43 AM

Ok guys, quick question, with 225/50/15 rub? if not I'm grabbing a set of Kumho Ecsta 710 to go AutoXing.

hooRAH · 03-12-2007, 09:11 AM

Well, I'd advise against the Rcomps (as will any instructor or experienced racer) until you're at the absolute limit of what you can do with your street tires (which is usually a few years of autoxs or HPDEs).

Reason is that the Rcomps, while faster, will cover up your mistakes, and you won't improve your driving ability as much as if you learn to get the most out of street tires.

Do what you want, but I wouldn't go to Rcomps that quickly. On top of that, Rcomps are expensive, and I could much better put that money to use in more street tires, brake pads, oil changes, etc to get me more track time.

Pimpinda93camry · 03-12-2007, 10:24 AM

no such thing as an overtired car.

expect in drifting

r comps will get better grip stiffer better handling. I have r comps and they make my car fell better . but lower sidewall helps too.

but they wear faster and you will want to switch them out for winter because o they have no grip in winter

hooRAH · 03-12-2007, 11:46 AM

Quote:

Originally Posted by Pimpinda93camry

but they wear faster and you will want to switch them out for winter because o they have no grip in winter

Are you saying that you run rcomps on the street during summer? Or just that rcomps won't work well as a rice tire when the temp outside is pretty cold?