Why not more camber?
10-20-2018, 10:50 PM
#21
OK, but there was no difference in wear between inner and outer shoulders? Many people, even in STR, write about flipping their REs to maximize wear, so it must be fairly common for the outside shoulder to wear faster. Those cars had none of that? (And they were driven competitively I assume?)
yes they were driven reasonably competitively. all three cars have trophied at packwood tour at different times from 2016/17/18 and one car has trophied also at crows in 2017 and twice at nationals in 2016/2017 and on re71 in 2016
attached what were brand new after 6 test and tune and 6 day 1 runs at Lincoln
http://i63.tinypic.com/1z1a0x0.jpg
Last edited by ncrx; 10-21-2018 at 01:40 PM.
10-22-2018, 02:31 PM
#22
I haven't driven the RE-71R specifically, but for any other streetable tire I've ever come across, those pressures are really low. Not surprised the tire is is falling over on the shoulder if you are dipping below 30 psi hot. Try 38-39 psi hot and see if that changes things.
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DavidNJ (10-22-2018)
10-23-2018, 01:18 PM
#23
Fwiw currently running 4/3 front and rear on Hoosier a7 315/30/18 squared. 1000/850 rates on motons and karcepts bars. Car is much more planted than it was at 3.4/2.4 and no adverse effects on braking or putting power down
10-23-2018, 01:50 PM
#24
- What class are you running in?
- How much did you lower the car?
- Did you consider dropped spindles?
- How did you widen the fenders?
- What size Karcepts bars are you using?
- Did you consider using the 335/30-18 Hoosiers, listed as the same diameter as the 315/30 tires?
10-23-2018, 02:40 PM
#25
if it fits wear it !! just cant imagine the grip ability of such a set up 
10-24-2018, 12:01 AM
#26
Originally Posted by DavidNJ
That is a pretty serious setup. When Hoosier became the spec tire for Spec Racer Ford in 2016 they recommended -3.7 to - 4.0 for the fronts and -3.4 to - 3.7 for the rears.
- What class are you running in?
- How much did you lower the car?
- Did you consider dropped spindles?
- How did you widen the fenders?
- What size Karcepts bars are you using?
- Did you consider using the 335/30-18 Hoosiers, listed as the same diameter as the 315/30 tires?
10-24-2018, 04:00 AM
#27
If you don't mind sharing, what are your wheel specs to keep everything in the stock fenders?
10-24-2018, 06:12 AM
#28
Former Moderator
Keep in mind that caster adds camber mostly in slower speed corners where you have to crank in the steering. Many high speed corners only need about 1/8 of a turn of the steering wheel so caster doesn't add much camber.
10-27-2018, 05:51 PM
#29
- Did you need to go to OS Giken or other Salisbury differential to maintain power with the lightly-loaded inside tire? The decal implies you did.
- Since the tires are 25.6" diameter vs 24.7" for the OEM size, how adversely affected was the geometry?
- The stiffer than common front springs help keep the geometry in check?
- Was their stiffness determined from testing?
- Did they help keep the tires out of the fenders under braking? I'm guessing you pull some of the highest braking forces of any S2000.
- Hoosier has that size (and lots of sizes around it) in both 17" and 18" wheel diameter. Why did you choose the 18"?