FLACHT6_pilot

What is the minimum camber you need on the front of the car to run a Forgeline type 19 x 9" (ET50) wheel with a 265/35/19 RE-71R?

Is -2 degrees enough or do you need -3 degrees to avoid rubbing?

Thanks,

John

pkh

Why 265? That's pretty fat for a 9" wheel. I run 245 with good results. I run 3.6 degrees camber but I am also lowered somewhat with the tarret springs.

I did rub a bit on my last event but I was hitting curbs, so I think I am just going to avoid those.

FLACHT6_pilot

Thanks for the feedback. 265 seems to be a pretty common fitment with 9s, but if rubbing is an issue I may think about going the 245 route instead.

pkh

I can't find the source, but I remember reading some guys trying 245/265 back to back and not really liking the wider tires. Wider tires generally good but not pinched onto narrow wheel.

With 245/285 medium/stiff sway bar settings, 3.6/3 camber and tarret springs I get very neutral response and even tire wear. When you look side by side at stock wheels and tires, the stockers look massively staggered.

I ran stock setup for a couple of days and even with cup2s they were always a good 2 seconds slower than Forgeline RE71R setup. Forgelines definitely worth it!

FLACHT6_pilot

You're right that the stockers are massively staggered. Good to hear the 245 on a 9" wheel is working well. I'm surprised you are still having some rubbing with that combo. Is the rubbing on the inside or the outside? Do you have the caster correction bushings to re-center the wheel at the camber you are running? Thx.

pkh

Yes I have all the alignment bits so caster maintained from stock. The rubbing issue I had was from nailing some pretty big curbs on track in my last event... I went 15 track days previous with no problems. YRMV.

i would raise it up a bit but guess I'm maxed out on the tarret springs. If you are running stock springs you won't have problems I'd imagine.

2cayman

Forgeline type 19 x 9" (ET50) wheel with a 265/35/19 RE-71R I'm running this set-up with stock suspension and about -1.8 camber. Only issue was I had to trim the front brake duct on the passenger side a little bit.

pkh

Oh yeah forgot to mention that was required for me as well.

Bill Lehman

I've been running the 265 R7 on CCW 9" wheels (51 offset) @ -3.0 without any issue until I lowered the front 10mm to restore the rake lost from higher F tires vrs smaller (295/30) R tires. I got occasional light rubbing on the outside. Fixed it by adding camber plates to pull in the top of the front Removed shims to maintain camber.

GTS_Ninja

I think it is fair to mention that R7 widths run narrow. So not apple to apples.

I know plenty of folks running 245 on 9" wheel widths without issue. If anything the 245 on the OEM 8.5" width is a tad more than even needed.

Personally, I would just go with 245 on the 9."

paradocs98

And for yet another option, I'm running 19x9 front Forgelines with 255/35-19 PSCup2s. Combined with rear 295/30-19 tires on 19x11 wheels, it neutralizes some of the stock stagger while maintaining the same rake as stock. Running -2.5 front and -2.0 rear camber, with the caster pucks to reestablish stock caster. Slight rubbing at full lock in parking situations, but otherwise no issues.

fastauto

I have been looking into a similar setup and I think if you shoot for close to -3 you should be more than fine.

ZG911

Do you have any photos of the trimmed brake duct?

2cayman

Pretty self explanatory. Heard a ticking sound coming from the front passenger side only when braking. Just jacked the car up slightly, borrowed my wife's "good" scissors, (you know the one's that are off limits to the male members of the family) and cut off about 1/4 inch off the end of the duct. No biggie.

CMS

To the OP, -2 degrees camber is workable with the RE-71Rs on an OEM GT4, but -2.8 to -3.2 is ideal, along with 1 to 2mm toe-out in front and stock caster. One thing we found when developing adjustable front and rear sway bars for the GT4 is that, with stiffer bars, the car liked a little less camber front and rear as there wasn't as much camber gain in corners. About -2.5 seemed ideal, and as a bonus gave us better braking performance. The added adjustment on the sway bars (five holes vs. two OEM) also made it possible to dial out understeer without having to run 265 tires in front (though we still do sometimes!), making the steering feel a little more precise.