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Old 06-16-2019, 07:50 PM   #3641
hukdizzle
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Hi RCE/CSG!

Recently installed RCE Tarmac 2 coils and I am looking to get into a lighter/wider wheel and was hoping to get some input on the tire/wheel clearance for the following.

RCE Tarmac 2 (Raceseng Cascam Top Mounts)
17x9 Enkei RPF1 +45mm Offset
245/40/17 DOT Tire (Likely an RS4 or something along those lines)

Installation wise, the car has a crash bolt installed up front from prior classing and since the top hole of the strut mount on the tarmac is slotted I will be maxing out the static camber via that, and then adding additional camber via the top mounts to achieve necessary track oriented camber. I am looking to achieve the following alignment/ride height with adequate strut/tire clearance.

Camber F : -3.5'
Toe F : 0" Total
Camber R : -2.5'
Toe Rear : 1/16" Total
Caster F : 7.0'

Ride Height : Approx 13.56" from top of fender to center of wheel hub. Slight rake with the rear being a 1/16" higher than the front. Car will be corner balanced so static corner heights may change slightly.


Would perhaps a +35 offset RPF1 be the better choice here? It seems like per the ft86motorsports wheelfit calc if I go with the +45 I am going to be extremely close to the damper assembly. If I go with the +35 there is a chance of it rubbing on the fender/liner possibly on the outside shoulder.


Thanks for the help!

Last edited by hukdizzle; 06-16-2019 at 08:00 PM.
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Old 06-17-2019, 09:43 AM   #3642
Racecomp Engineering
 
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Quote:
Originally Posted by MaverickMonk View Post
Thanks Andrew, I'll have to take you up on that, even if it means crossing the DC Area Supercollider / Capital Beltway. I'm doing my best to get in deep as far as understanding all this stuff, but reading books is no substitute for experience.

Cheers
The amount of traffic at any time of day, any day of the week is infuriating.

Right now I've got a bit of an experimental set up on my SS1s (softer spring rates) but I do plan to return them to the standard 6 kg/mm springs at some point this summer. Just give me a heads up and we'll work something out.

I also really want to host a meet and suspension tech info day sometime!

- Andrew
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Old 06-17-2019, 09:52 AM   #3643
Racecomp Engineering
 
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Quote:
Originally Posted by hukdizzle View Post
Hi RCE/CSG!

Recently installed RCE Tarmac 2 coils and I am looking to get into a lighter/wider wheel and was hoping to get some input on the tire/wheel clearance for the following.

RCE Tarmac 2 (Raceseng Cascam Top Mounts)
17x9 Enkei RPF1 +45mm Offset
245/40/17 DOT Tire (Likely an RS4 or something along those lines)

Installation wise, the car has a crash bolt installed up front from prior classing and since the top hole of the strut mount on the tarmac is slotted I will be maxing out the static camber via that, and then adding additional camber via the top mounts to achieve necessary track oriented camber. I am looking to achieve the following alignment/ride height with adequate strut/tire clearance.

Camber F : -3.5'
Toe F : 0" Total
Camber R : -2.5'
Toe Rear : 1/16" Total
Caster F : 7.0'

Ride Height : Approx 13.56" from top of fender to center of wheel hub. Slight rake with the rear being a 1/16" higher than the front. Car will be corner balanced so static corner heights may change slightly.


Would perhaps a +35 offset RPF1 be the better choice here? It seems like per the ft86motorsports wheelfit calc if I go with the +45 I am going to be extremely close to the damper assembly. If I go with the +35 there is a chance of it rubbing on the fender/liner possibly on the outside shoulder.


Thanks for the help!
Are you set on the RPF1s? You could consider the Weds TC105X in 17x9 +42 as that is a confirmed easy button fitment for track cars with 245s and camber. I'm not a wheel fitment wizard, though, I just have my fitments that I know work and stick with them.

The rest of your set up sounds great! Yes get as much camber as you can at the lower mount (safely). Ride heights sound good too. Definitely do some test and tuning since depending on your final tire choice you will want to dial in front camber with a pyrometer if you can. Keep us posted.

- Andrew
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Old 06-17-2019, 01:12 PM   #3644
hukdizzle
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Originally Posted by Racecomp Engineering View Post
Are you set on the RPF1s? You could consider the Weds TC105X in 17x9 +42 as that is a confirmed easy button fitment for track cars with 245s and camber. I'm not a wheel fitment wizard, though, I just have my fitments that I know work and stick with them.

The rest of your set up sounds great! Yes get as much camber as you can at the lower mount (safely). Ride heights sound good too. Definitely do some test and tuning since depending on your final tire choice you will want to dial in front camber with a pyrometer if you can. Keep us posted.

- Andrew

Thanks for the recommendation Andrew, I will take it into consideration!
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