Widest Tyre On R33 Gtr?

[HKS26T]

would i come across probs with these on a 33 gtr ?

any real life experiences?

Cheers

Steve

[JAGR33]

As long as your running a 10.5 inch wide rim then no problem.

I have run both 265's and 285's and there was no real difference on the track, only the wallet....

[Brandon]

LMGT4 18" x 9.5" +22

285/35/18 all round. Not lowered with original suspension though. No issues at all. Perfect fitment without a single sight of tyre stretching.

At 10.5 with 265, you'll find a bit of stretching but if you're not too concern with the look, by all means go that way because 285 does cost a bit more 265...

If I'm changing tyres, I'll probably go 265 all round due to price. You cant really justify the price for the performance difference between the 2 sizes.

[HKS26T]

The primary objective is to obtain maximum grip on the track.

I will be testing my GTR on yoko AD08 to see how i will stack up in the "Evo vs R35" cup aka Clubsprint Superlap

I will not quite declare a 600hp GTR helpless yet until i go out there and see for myself.

Clearance issues was what i am concerned about - its good to hear that when raised there is no clearance issues. My real concern

is when i start running neg 3-4 degrees camber on the front and normally i run quite a low ride height assist in turning.

The options are 265/35/18s vs 285/30/18 (Yes it will be more expensive) but it will be well worth if it can grip better on turn 1 @ EC

i am currently running stretched 265s on a 10.5 inch rim. JAG could you please elaborate on no real difference? (i'm aware on r compound tyres

but not quite sure on street slicks - is wider better?)

Cheers

Steve

Edited February 5, 2010 by HKS26T

[JAGR33]

Hey Steve,

I was referring to RE55s, and they are usually wider than a street tyre due to side wall design. A 265 RE55 is wider than a standard 265 street tyre. Running the 285 RE55's did not give me a noticeable difference as far as performance/grip. Personally I would get some 265's and put the savings towards the entry fee for Superlap...

I run -3.5 camber, and with 285 RE55's and had no clearance issues, so 285 street tyres on your car shouldn't be an issue.

Another thing to consider is that if you're going to run street tyres for superlap don't run huge amounts of camber, the grip levels of the tyre will not load up the suspension enough to create an even contact patch for the tyre on to the road, causing chronic understeer. I did Superlap in '08 at OP GP and my car with 350rwkws had both understeer and oversteer problems due to insufficient grip from the Bridgestone RE-01R's (265/35/18). Managed a 1:20, so for my first time ever at that track wasn't too bad, but could have been better if I ran less camber on the front.

Hope that helps...

[HKS26T]

Hey Steve,

I was referring to RE55s, and they are usually wider than a street tyre due to side wall design. A 265 RE55 is wider than a standard 265 street tyre. Running the 285 RE55's did not give me a noticeable difference as far as performance/grip. Personally I would get some 265's and put the savings towards the entry fee for Superlap...

I run -3.5 camber, and with 285 RE55's and had no clearance issues, so 285 street tyres on your car shouldn't be an issue.

Another thing to consider is that if you're going to run street tyres for superlap don't run huge amounts of camber, the grip levels of the tyre will not load up the suspension enough to create an even contact patch for the tyre on to the road, causing chronic understeer. I did Superlap in '08 at OP GP and my car with 350rwkws had both understeer and oversteer problems due to insufficient grip from the Bridgestone RE-01R's (265/35/18). Managed a 1:20, so for my first time ever at that track wasn't too bad, but could have been better if I ran less camber on the front.

Hope that helps...

This is exactly what im after !

Were there any other adjustments required when running the Bridgestone RE-01R's ? what tyre pressure were you running? anything you could have or not done better? - this means you were only a couple of sec off the s2k with boz driving it??

Awesome effort for first time on track! Are you coming up this year?

I have just ran 255/17s in re55s and had no pobs with the balance of the car - i just know when i go street tyres im going to have a uphill task!

Cheers

Steve

[Pezhead]

I run 275 35 18 Toyo's on my 33 GTR. At full lock the inside of the tyre is just about touching the front anti roll bar (the part on the stock bar that is flatenned so that the tyre doesn't foul). It only clears by like 3-4 mm so that is about as large as you can go and still maintain factory full lock.

So if you are running aftermarket bars that don't have the flat spot you might have to reduce the front steering lock so not to foul. My car is driven to work every day so I have to make sure I keep it streetable, if this is track weapon - then different story.

And lets face it, without enducing the power turning/rear swing out feature, the turning circle on the 33's isn't a that great.

[JAGR33]

Steve,

Looking at the results I was 3.7 sec behind John in the S2000.

http://www.natsoft.com.au/cgi-bin/results....07/2008.ORAN.SL

I did my fastest lap on my 7th lap (second session), and the two sessions after that I didn't get much of a clear run. Third session was held up, and as you know there are not many places at OP GP to overtake. Last session of the day (4th), my car decided to shit a coil pack, so on 5 cylinders managed a 1:22. I'd say in the last session I would have had a good crack at getting into the 19's...

Anyway enough of my excuses....

Best advice I can give you is that once you have selected your tyre of choice, get some practise and see how the car behaves. Get a pyrometer to measure temps of the tyre from inside, centre and outside. This will determine what sort of camber you'd need. You'd like to get the tyre having the same temp throughout. And it would be much better getting that practise at EC, what works at Wakefield will not necessaty work at EC..

As far as attending this year, I'll be there, but only to spectate. Unfortunately the effort and costs involved in getting the car to Sydney and accommodation etc... is too much.

Maybe next year..

[HKS26T]

Steve,

Looking at the results I was 3.7 sec behind John in the S2000.

http://www.natsoft.com.au/cgi-bin/results....07/2008.ORAN.SL

I did my fastest lap on my 7th lap (second session), and the two sessions after that I didn't get much of a clear run. Third session was held up, and as you know there are not many places at OP GP to overtake. Last session of the day (4th), my car decided to shit a coil pack, so on 5 cylinders managed a 1:22. I'd say in the last session I would have had a good crack at getting into the 19's...

Anyway enough of my excuses....

Best advice I can give you is that once you have selected your tyre of choice, get some practise and see how the car behaves. Get a pyrometer to measure temps of the tyre from inside, centre and outside. This will determine what sort of camber you'd need. You'd like to get the tyre having the same temp throughout. And it would be much better getting that practise at EC, what works at Wakefield will not necessaty work at EC..

As far as attending this year, I'll be there, but only to spectate. Unfortunately the effort and costs involved in getting the car to Sydney and accommodation etc... is too much.

Maybe next year..

Thanks Jack!

I guess the positive is that there is no Boz in a s2000 in this class Nothing beats track experience, and not many are kind enough to share this info - there is definately lots of practice on the agenda - as i know of a couple of Evos lapping in the mid 1:40's at EC. I will make a decision with respect to tyres on Wed 17th when i go out there - i will use the Ad08 285/30/18 with not too much camber and see what she is doing out there (do you normally run higher pressure for street slicks? i was running 34psi when hot on the re55s - thinking of 38psi??)

Otherwise, E85 and open class here we come

[JAGR33]

These Evo's your talking about, they're doing 1:45's on street tyres??? If that's the case then the R35's are in trouble!!

Warren Luff did a 1:45 in a R35 stocker....

As far as tyre pressures I wouldn't know, only time I raced on them was at Superlap, and from memory I think they did prefer a little more psi than the RE55's. As far as 34psi hot on RE55's, it's spot on what I use....

Remember use/borrow a pyrometer when you decide to practise/test out the car, this will determine what camber your car likes best at that track with those tyres.

And looking at your sig you've done a 1:47 at EC with RE55's?

So looks like it might be an up hill battle to get to 1:45's with streeties. Although looking at your 1/4 mile time seems like your car has heaps of mumbo, you'll definetly make up some time on the straight!!!!

[HKS26T]

These Evo's your talking about, they're doing 1:45's on street tyres??? If that's the case then the R35's are in trouble!!

Warren Luff did a 1:45 in a R35 stocker....

As far as tyre pressures I wouldn't know, only time I raced on them was at Superlap, and from memory I think they did prefer a little more psi than the RE55's. As far as 34psi hot on RE55's, it's spot on what I use....

Remember use/borrow a pyrometer when you decide to practise/test out the car, this will determine what camber your car likes best at that track with those tyres.

And looking at your sig you've done a 1:47 at EC with RE55's?

So looks like it might be an up hill battle to get to 1:45's with streeties. Although looking at your 1/4 mile time seems like your car has heaps of mumbo, you'll definetly make up some time on the straight!!!!

The EC time and 1/4 mile was from a previous car - the car that i have now has more power, better handling and better brakes. (But still the same mofo driver LOL)

This is not official but one of the Evo's did a 1:45.9xx recently so this is all i have to go off - good to know a pro driver did 1:45 in a r35.

I have laid down a benchmark time of 1:47 on streets tyres - (to make it worth while going into clubsprint class). Otherwise they will be coming off and the traditional r-compound tyre will go on

Hmmmmm pyrometer? will a cupucino temp gauge work LOL

[JAGR33]

The EC time and 1/4 mile was from a previous car - the car that i have now has more power, better handling and better brakes. (But still the same mofo driver LOL)

This is not official but one of the Evo's did a 1:45.9xx recently so this is all i have to go off - good to know a pro driver did 1:45 in a r35.

I have laid down a benchmark time of 1:47 on streets tyres - (to make it worth while going into clubsprint class). Otherwise they will be coming off and the traditional r-compound tyre will go on

Hmmmmm pyrometer? will a cupucino temp gauge work LOL

Ah, that makes sense then, your Wakefield time is extremely quick compared to the EC time. EC would be around the 1:43's with the current car???

1:47 as benchmark time is very quick, and I'd say is achievable if conditions are great and the car is sorted. Just the mental state of the driver would be the decieding factor!!!

LOL at cupucino gauge, just don't apply too much pressure!!

[NickR33]

Thanks Jack!

I guess the positive is that there is no Boz in a s2000 in this class Nothing beats track experience, and not many are kind enough to share this info - there is definately lots of practice on the agenda - as i know of a couple of Evos lapping in the mid 1:40's at EC. I will make a decision with respect to tyres on Wed 17th when i go out there - i will use the Ad08 285/30/18 with not too much camber and see what she is doing out there (do you normally run higher pressure for street slicks? i was running 34psi when hot on the re55s - thinking of 38psi??)

Otherwise, E85 and open class here we come

can I make a suggestion, street tyres have a much softer sidewall that semis so I would run the 265's if I were you... that way you will have a slight stretch pulling the sidewall tighter and giving less flex

I have just recently gone from 265's to 275's and although a completely different brand of tyre I can feel the 275's have a little more compliance

[HKS26T]

can I make a suggestion, street tyres have a much softer sidewall that semis so I would run the 265's if I were you... that way you will have a slight stretch pulling the sidewall tighter and giving less flex

I have just recently gone from 265's to 275's and although a completely different brand of tyre I can feel the 275's have a little more compliance

rim size is 10.5 inch this is a very valid point you are making - can anyone else comment on this - it is $600 more for the wider tread as well

on the NEOVA web site - it states

- Steel sidewall inserts to increase casing rigidity

im thinking more width more grip

[Beer Baron]

don't forget we are only talking 20mm per tyre here. so 1cm on either side of each tyre. having said that I guess 40mm of tyre each end, and that means 20mm more track too can't be a bad thing. plus a 285 street tyre will be a good fit on the 10.5inch wheel. it's a lot of extra $ for just a little more tyre but if you think it will help then I say give it a shot.