1G CTSV Big brakes with RPF1s

jbeaton9292 · Apr 26, 2018

so im thinking of doing the ctsv front brake setup. I want to run rpf1s on my car 17x18.5 +35. Will they clear the calipers? I know these wheels have a lot of fitment issues with big brake kits on cars.

Brembo · Apr 26, 2018

You mean 17x8.5 in +35 offset? If yes then they should. It's when you go to 9 inch wide the spoke design gets straight and that creates fitmen issues.

jbeaton9292 · Apr 26, 2018

Brembo said:
You mean 17x8.5 in +35 offset? If yes then they should. It's when you go to 9 inch wide the spoke design gets straight and that creates fitmen issues.

Yeah thats what i meant. I want to run a 255/40r17 on them and also a set of hoosiers for track days.

zdravko_k2002 · Apr 26, 2018

It will not work. I did a ton of research and everyone told me it will work this person did it that person made it fit so what I did was try it out. I bought the Cts big brake kit and installed it. I also went ahead and bought the sbc finish rpf1s 17x9 brand new from stm along with 255 tires and not to mention 15mm spacers. The brakes already have a 5mm spacer and I put the 15mm STM spacer and the wheels still do not clear. I can tell you this from personal experience so you do not waste your money. Please keep in mind I do have a 2g but should not change anything. The straight design is the sexy one but unfortunately that’s why it doesn’t clear. I was super upset but at least wanna let you know it doesn’t work so it saves you some headaches.

slowwhite · Apr 26, 2018

What about the +22 offset anyone know if that will work with evo brakes?

Marchev · Apr 26, 2018

Dont have experiance with ctsv brakes, but I fit Wilwood 4 pot calipers and a 13in rotor, with rpf1s 17x9 +35 with a 5mm spacer

Brembo · Apr 27, 2018

zdravko_k2002 said:
It will not work. I did a ton of research and everyone told me it will work this person did it that person made it fit so what I did was try it out. I bought the Cts big brake kit and installed it. I also went ahead and bought the sbc finish rpf1s 17x9 brand new from stm along with 255 tires and not to mention 15mm spacers. The brakes already have a 5mm spacer and I put the 15mm STM spacer and the wheels still do not clear. I can tell you this from personal experience so you do not waste your money. Please keep in mind I do have a 2g but should not change anything. The straight design is the sexy one but unfortunately that’s why it doesn’t clear. I was super upset but at least wanna let you know it doesn’t work so it saves you some headaches.

I said that 9 inch creates a problem because of spoke design change but 8.5 or smaller should work.

slowwhite said:
What about the +22 offset anyone know if that will work with evo brakes?

You still need spacers for the front evo calipers. I beliave the minimum is 18 offset where it clears. You would have to doable check but I beliave thats the magic number. I also think it wont fit the fenders, meaning it will poke like crazy.

slowwhite · Apr 27, 2018

Ya was reading more again on the evo forums last night. They say the +22 still requires a spacer.

Which did raise another question. Since the +15 comes in a 10.5 and a 9.5 both require I'm sure fender flares (which I plan to do anyways) but the question I have is will the 9.5 require the suspension mods like the 10.5 does? Or will it just depend on size of tire used? I believe john was running 285 on his 10.5 rpf1's. But now runs a 315 on his new wheels.

I was thinking 265-275 for the 9.5

Here's a pict of the material removal and replacement bobby Gould did for john freund.

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96dsmftw · Apr 27, 2018

17x10 +18 clear with no spacers for Brembos. I have quite a bit of space left too before it hits the caliper

Brembo · Apr 27, 2018

96dsmftw said:
17x10 +18 clear with no spacers for Brembos. I have quite a bit of space left too before it hits the caliper

Thank you for confirming and pics please.

96dsmftw · Apr 27, 2018

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You can see it there. You might be able to zoom in. They are in the car for the next race this weekend so I won't be able to get a close up until Sunday.

Brembo · Apr 27, 2018

Looks great thanks. Just take some pictures of the wheels and how much they poke. Camber specs would be nice. Thank you and good luck.

slowwhite · Apr 27, 2018

What size tires are you using?
Edit : checked your profile 275 size tire.

ANY mods needed to the suspension for it to clear?
Edit: you and I have the identical suspension setups

What all did you do the fenders? Just rolled?

96dsmftw · Apr 28, 2018

slowwhite said:
What size tires are you using?
Edit : checked your profile 275 size tire.

ANY mods needed to the suspension for it to clear?
Edit: you and I have the identical suspension setups

What all did you do the fenders? Just rolled?

No mods to clear this setup. The 17x10 +18 clears the Knuckle. I have -2.5 in front and -1.5 in back. Nothing to fenders. HOWEVER, my front spring rates are at 13k front and 6k rear. And they poke, quite a bit. But it's not a stance car either.

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slowwhite · Apr 29, 2018

When you had feal do your kit did you specify those spring rates?

I should have probably gone with the tire I was going to use vs what I was running at the time when I had them build my set.

However things have been good with work and I'm a lot farther along then I would ever have imagined on my build.

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