spiderpigcity Posted January 13, 2009 Share Posted January 13, 2009 can anyone tell me if i can get away with 285/30/19 on the rear of a auro tt with hks pro coilovers and 9.5j wheels? i have 265/35/18 on at the moment and they are fine. Link to comment Share on other sites More sharing options...
Homer Posted January 13, 2009 Share Posted January 13, 2009 The 30 profile is too skinny isn't it? It'll affect your gear ratio, acceleration, top speed, geometry and above all else, the handling and grip. It's adviable to keep the overall tyre diameter as close to stock as possible. Edit - give me a minute, I'll check it on the calculator results: Stock (265/40x17): 644mm diameter Current (265/35x19): 643mm diameter (-0.16% difference so close to ideal) New (285/30x19): 657mm diameter (+2% difference so not too great) It'll be slightly slower to accelerate and have higher top speed, but you'd need to consider a geo with the difference size Do you known the offset of the current wheels? Has it had a geo since fitting? Link to comment Share on other sites More sharing options...
spiderpigcity Posted January 14, 2009 Author Share Posted January 14, 2009 The 30 profile is too skinny isn't it? It'll affect your gear ratio, acceleration, top speed, geometry and above all else, the handling and grip. It's adviable to keep the overall tyre diameter as close to stock as possible. Edit - give me a minute, I'll check it on the calculator results: Stock (265/40x17): 644mm diameter Current (265/35x19): 643mm diameter (-0.16% difference so close to ideal) New (285/30x19): 657mm diameter (+2% difference so not too great) It'll be slightly slower to accelerate and have higher top speed, but you'd need to consider a geo with the difference size Do you known the offset of the current wheels? Has it had a geo since fitting? without going into the techy stuff im running around 600rwhp and just want to go up from 18 to 19 wheels. just wanted to know what size to put on the back. let me know what you think? thanks Link to comment Share on other sites More sharing options...
Kev.O Posted January 14, 2009 Share Posted January 14, 2009 The 30 profile is too skinny isn't it? It'll affect your gear ratio, acceleration, top speed, geometry and above all else, the handling and grip. It's adviable to keep the overall tyre diameter as close to stock as possible. Edit - give me a minute, I'll check it on the calculator results: Stock (265/40x17): 644mm diameter Current (265/35x19): 643mm diameter (-0.16% difference so close to ideal) New (285/30x19): 657mm diameter (+2% difference so not too great) It'll be slightly slower to accelerate and have higher top speed, but you'd need to consider a geo with the difference size Do you known the offset of the current wheels? Has it had a geo since fitting? Isn't there a program somewhere Homer? Here's the one for the wheel offset calculator: Linky Link to comment Share on other sites More sharing options...
spiderpigcity Posted January 14, 2009 Author Share Posted January 14, 2009 Isn't there a program somewhere Homer? Here's the one for the wheel offset calculator: Linky the problem isnt working out the rolling circ. its more of a question aimed at the guys who have fitted 19 inch wheels. more to do with what you can physically fit in the car without any wheel arch mods. Link to comment Share on other sites More sharing options...
Jake Posted January 14, 2009 Share Posted January 14, 2009 Stock (265/40x17) Stock width isn't 265 IIRC it's 255/40/17 Link to comment Share on other sites More sharing options...
Kev.O Posted January 14, 2009 Share Posted January 14, 2009 the problem isnt working out the rolling circ. its more of a question aimed at the guys who have fitted 19 inch wheels. more to do with what you can physically fit in the car without any wheel arch mods. In that case the offset will play a big part Link to comment Share on other sites More sharing options...
merckx Posted January 14, 2009 Share Posted January 14, 2009 Would a 285/30 19 tyre and a 9.5" wheel be wide enough for 600rwhp? I've got a 275/30 19 on the rear which is close as I could get to the stock tyre diameter. Link to comment Share on other sites More sharing options...
spiderpigcity Posted January 14, 2009 Author Share Posted January 14, 2009 the problem isnt working out the rolling circ. its more of a question aimed at the guys who have fitted 19 inch wheels. more to do with what you can physically fit in the car without any wheel arch mods. ok let me re phrase the question, maybe it was a little unclear. i am running 600rwhp and just wanted to know whether wider than 265 would be of any benefit as regarding better traction now i have more power. i am looking at some 19 inch wheels and wondered if i should stay with 265/35/19 or whether i could get away with fitting 285/30/19 or even 275/35/19? any body had experience fitting these sizes on a TT with hks coilovers? hope that helps Link to comment Share on other sites More sharing options...
Homer Posted January 14, 2009 Share Posted January 14, 2009 Stock width isn't 265 IIRC it's 255/40/17 Yep, you're correct. Slipped up there ok let me re phrase the question, maybe it was a little unclear. i am running 600rwhp and just wanted to know whether wider than 265 would be of any benefit as regarding better traction now i have more power. i am looking at some 19 inch wheels and wondered if i should stay with 265/35/19 or whether i could get away with fitting 285/30/19 or even 275/35/19? any body had experience fitting these sizes on a TT with hks coilovers? hope that helps The tyre width isn't important, it's the suspension geometry, wheel width, offset, diameter, spring rate, bound, rebound and wall height thats means everything. There's no single factor you can adjust without upsetting everything else, it needs to be looked into as a whole rather than compenents, especially if you are going to be putting down that level of power. Link to comment Share on other sites More sharing options...
DannoSupra Posted January 14, 2009 Share Posted January 14, 2009 But yeah, you'll have to roll your arches! I had to with 275/30 19 Link to comment Share on other sites More sharing options...
tony1 Posted January 14, 2009 Share Posted January 14, 2009 Hi Mattcraven I have got koni adjustable all round and I’m running 235 x 35 x 19 front and 285 x 30 x 19 rear. The arches have not been rolled but i have had to use spacers to clear the calipers. Pics in my garage. Tony Link to comment Share on other sites More sharing options...
JamieP Posted January 14, 2009 Share Posted January 14, 2009 (edited) I had to trim my arches right back with 295/30/19's, depends on what offset you have though. 600rwhp on a T04r? you got a dyno sheet? Edited January 14, 2009 by JamieP (see edit history) Link to comment Share on other sites More sharing options...
ellis Posted January 14, 2009 Share Posted January 14, 2009 600rwhp on a T04r? you got a dyno sheet? Please no, not again!!! Link to comment Share on other sites More sharing options...
JamieP Posted January 14, 2009 Share Posted January 14, 2009 Have i missed a thread? Link to comment Share on other sites More sharing options...
magictorch Posted January 14, 2009 Share Posted January 14, 2009 600rwhp on a T04r? you got a dyno sheet? Auto as well;) Link to comment Share on other sites More sharing options...
baldy Posted January 14, 2009 Share Posted January 14, 2009 I had to trim my arches right back with 295/30/19's, depends on what offset you have though. 600rwhp on a T04r? you got a dyno sheet? hi jamie what width rims are yours and offset? cheers simon Link to comment Share on other sites More sharing options...
JamieP Posted January 14, 2009 Share Posted January 14, 2009 They are 10.5", i dont know the offsets Link to comment Share on other sites More sharing options...
Guest sonyaddict Posted January 14, 2009 Share Posted January 14, 2009 Ultralite Evolves 19 x 10 Fit the rears perfectly. Link to comment Share on other sites More sharing options...
DodgyRog Posted January 14, 2009 Share Posted January 14, 2009 Have i missed a thread? You can't of missed this thread;) http://www.mkivsupra.net/vbb/showthread.php?t=173488 Link to comment Share on other sites More sharing options...
Guigsy Posted January 14, 2009 Share Posted January 14, 2009 you will have to spend all night reading it though Link to comment Share on other sites More sharing options...
JamieP Posted January 14, 2009 Share Posted January 14, 2009 You can't of missed this thread;) http://www.mkivsupra.net/vbb/showthread.php?t=173488 Ahh i see, lots of handbags in that one so gave up reading after the first few pages;) Link to comment Share on other sites More sharing options...
spiderpigcity Posted January 15, 2009 Author Share Posted January 15, 2009 I had to trim my arches right back with 295/30/19's, depends on what offset you have though. 600rwhp on a T04r? you got a dyno sheet? t67dbb .81ar not t04r Link to comment Share on other sites More sharing options...
JamieP Posted January 15, 2009 Share Posted January 15, 2009 Still be supprised if that makes 600rwhp, mine is 460rwhp at 1.5bar Link to comment Share on other sites More sharing options...
csa Posted January 15, 2009 Share Posted January 15, 2009 thread hijack: Homer...can you do a calc with stock rear vs 315/25-19 and 305/30-19 and front stock vs 245/40-19 and 245/35-19 thanks a heeps :-) Link to comment Share on other sites More sharing options...
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