Square track setup

[Nagata-San]

Hello,

I'm about to buy new rims and tires.

I'd like your opinion, as I'm looking for a squared setup.

I'd like to go 265/35/18 all around, to swap front / rear.

I'll start with Yokohama AD08R, then will go on Direzza.

I'm riding KW Clubsport 2 ways, on the lowest, with 1.6° camber all around.

About Apex, ARC8 or EC7, Should I go

9.5 ET22
or
10 ET25
?

Thanks for the help,

[CP 1///M]

I thought 18x10 in front is really tight esp with 265 tires - I went with 18x9.5 ET22. I think 265/35R18 should fit - I wanted wider but 275/35R18 will rub in front (on ET22) and 285/30R18 is a beotch to mount/dismount. With 265 you effectively only gain more front traction since stock rears are 265/35R19 on 19x10, while 285 should net you more traction both front and back. In order to fit 275 in front I would have needed spacers of different thickness and use 18x9.5 ET35 (5mm front, 10mm back) and still it might rub on turns against the liner. I got ARC8 as I like symmetry, and run -2 camber with zero toe in front with Ground Control camber plates.

[craina]

I run square 275/35 on 18x10 et25 apex on the track. The fronts will rub the fender liners slightly but only at full lock. It does not seem to impact tire wear significantly. I have camber plates (ground control) on the stock suspension and I add camber at the track. The rubbing occurs at both settings, but again, it is only slight.

[bdaddylo]

I used to run 275/35/18 Arc8 9.5" ET22 with only slight rubbing at full lock. There's no reason to be at full lock when on the track. My current set are 10" ET25. Plenty of 1M owners have run this setup with no issues. When in doubt, try to take measurements to see what works with your suspension setup.

[1&done]

^agree

I run a 275 squared set w/ Conti slicks. 9.5F and 10.5R, cannot recall ET but will check -plan to jump up in rears once these go, I just don't track this car as much.


Edit ET26F, 22R. Moving to 295rears, no rubbing or spacers. Perfecto!

[Nagata-San]

Thanks guys.

Seems that KW Clubsport has big springs, might need 5mm spacers in front.

Is the car stable with square or is it needed to go 10/11 with 265/295 ?

[craina]

265/295 will provide more stability coming out of the corners on power than a 275 square setup but that is not to say it will not break loose on occasion. 275 square will have noticeably less understeer and will oversteer more frequently on power. I personally prefer the balance of the 275 square and don't mind a little slide every now and again. I wish Mark (M3adjuster) would chime in as I know he lots of experience with staggered and square setups on this car. IIRC he prefers the square, but it is really a personal preference.

[Nkc]

So I'm running 275/35/18 R888s on Apex Arc8 18x10 squared with KWv3 and voshlag plates tomorrow on track. Also put on 5mm spacers in front just to clear the struts a bit more.

Fronts rub slightly before full turn. I'm really looking forward to this setup. Wish me luck.

[Nagata-San]

Can't wait to read your feedback.

The plastic shit close to oil cooler touches to everyone...

My actual setup AD08-R 245/35/19 touches too on left full lock.

[Nkc]

Ok just got back from my track day with my setup described above.

I was really amazed by how well the car turned in as understeer has been almost completely eliminated with props to the camber plates too. I'm really glad I chose to go with a squared setup and thanks to Neil MDORPHN for all the technical help. The fronts will rub on full turn but as a lot have mentioned, it's not really noticeable. What I'm now really having problems with is correcting and controlling the oversteer coming out on a tight and short course. I felt as if I was fighting with the car a lot more than I should and I got really exhausted but it was fun as hell. Maybe I need to fine tune the KW's a bit more to match my driving style. Maybe the turn in is so good now that my mid cornering and exit seems bad to me.

What really impressed me today were the AP Racing bbks and again thanks to Neil for the recommendation. I couldn't believe how late I could start braking. I did manage to pass a 991 GT3 today but I'm 99% sure he was just a slow driver. It was a great experience going squared as this is my first time doing so on a rwd car. In the future, I would probably go a bit wider in the rear, maybe 295 so I can put more power down on exits. Would love to get some advice on the issue of oversteer from you guys. I was sliding all over the place.

What a tiring day. Going to try a bigger course next time.

[MDORPHN]

Originally Posted by Nkc

Ok just got back from my track day with my setup described above.

I was really amazed by how well the car turned in as understeer has been almost completely eliminated with props to the camber plates too. I'm really glad I chose to go with a squared setup and thanks to Neil MDORPHN for all the technical help. The fronts will rub on full turn but as a lot have mentioned, it's not really noticeable. What I'm now really having problems with is correcting and controlling the oversteer coming out on a tight and short course. I felt as if I was fighting with the car a lot more than I should and I got really exhausted but it was fun as hell. Maybe I need to fine tune the KW's a bit more to match my driving style. Maybe the turn in is so good now that my mid cornering and exit seems bad to me.

What really impressed me today were the AP Racing bbks and again thanks to Neil for the recommendation. I couldn't believe how late I could start braking. I did manage to pass a 991 GT3 today but I'm 99% sure he was just a slow driver. It was a great experience going squared as this is my first time doing so on a rwd car. In the future, I would probably go a bit wider in the rear, maybe 295 so I can put more power down on exits. Would love to get some advice on the issue of oversteer from you guys. I was sliding all over the place.

What a tiring day. Going to try a bigger course next time.

Glad you had a good day! Always happy to help.

Neil

[Nagata-San]

Check your tire pressures when oversteering, or maybe the alignement.

With 265 power should be ok with semi or slicks.

[slonik]

275/35 on 18x9.5 et22 apex ec7 on front. doesn't rub - fender liners bended with heat gun.

[Nagata-San]

What brand of tires ? That changes the curve and width a lot betweek en Michelin PS2 and a AD08R for example.

[CP 1///M]

I would be interested to know which 275/35 tires would not rub with 18x9.5 ET22 in fronts (I have ARC8).

[slonik]

What brand of tires ? That changes the curve and width a lot betweek en Michelin PS2 and a AD08R for example.

hankook rs3 now, and then we are planning to use z214 semislick.

before modification tyres were touching liners a lot when turning steering wheel. then spent 2 days from morning to evening with heating gun and hummer and doesn't rub at all.

[Nagata-San]

Can you show us what does the fender look like now ? In / Out ?

[slonik]

Can you show us what does the fender look like now ? In / Out ?

outside - like stock only liners were modified and sheet metal under it (behind the wheel, rear side).

i'll try to make some pics after weekends - 135 driving on trackdays this days.

[Nagata-San]

Thanks.
Cause there's not plenty room in front for wider wheels.

[M3 Adjuster]

Originally Posted by Nagata-San

Hello,

I'm about to buy new rims and tires.

I'd like your opinion, as I'm looking for a squared setup.

I'd like to go 265/35/18 all around, to swap front / rear.

I'll start with Yokohama AD08R, then will go on Direzza.

I'm riding KW Clubsport 2 ways, on the lowest, with 1.6° camber all around.

About Apex, ARC8 or EC7, Should I go

9.5 ET22
or
10 ET25
?

Thanks for the help,

go with the AD08s on the 18 x 10s I used these tires and they are a good hot weather /track tire but they do get loud as they wear down. They are much louder than, say... a Michelin Pilot SS.

they should fit with minimal rubbing... anything from 255 up to 285 seems to rub the front fender liners in the same way. Enough to cause slight wear but no major issues unless in a tight parking maneuver.

The square setup really helps manage tire wear... and the car is more predictable with a square setup and it also eliminates push (understeer)... Exiting corners... the bigger rear tire do help get the tire down faster.. but I think you would be best off with a bigger rear wheel as well.. in which case you won't be rotating the setup all around any more either.

Save the staggered setup for when there is timing involved or money on the line

In addition...the 9.5s are harder to sell if the time comes.. I have a friend who has 9.5s front and 10.5s rear and he can't get rid of the set and everyone wants the rears and not the fronts. I almost considered buying the set for the rears but then I would have to sell off the fronts... plus I have two sets of 18 x 10s anyway already. If anyone wants a staggered set of Arc 8s in orange.. cheap.. let me know.

[slonik]

Originally Posted by Nagata-San

Thanks.
Cause there's not plenty room in front for wider wheels.

better late than never




edge behind the wheel was bent.

but! we had another problem with lowering, under hard cornering on semislick


it's another 20mm on the top of the wheel, which can be cut (or bent, which you would prefer)

[Nagata-San]

I finally went the classic way in my track setup:

10x18 265/35/18
10.5x18 295/30/18
Pirelli TrofeoR