The Official Wide Tire Thread
#796
Evolved Member
iTrader: (1)
Is your EvO strickly track only? If not, those race tires are certainly very aggressive & the real size is may be more like a 275/40. That high profile is certainly adding to the rub condition
If you moved to a traditional 265/35 that would help
Maybe you already know that. just adding my .02 as noted
If you moved to a traditional 265/35 that would help
Maybe you already know that. just adding my .02 as noted
I also know that this is a slightly taller tire (not to mention the normal R-Comp actual vs sidewall width). These tires are intended for road racing. It is advantageous to have a slightly taller tire (Hoosier A7 275s for example) in some scenarios. I'd like to get the car to be able to fit a few different sizes of wide slicks/r-comps.
So the question: Best fix for front rub?
A. Add Caster
B. Chop and hack fender liners
#797
Evolved Member
iTrader: (41)
For starters as minus mentioned those tires are pretty tall which isnt helping your case.
Im not familiar with the K-mac plates as far as how much additional caster you can achieve but looking at your picture you don't have it on the max caster setting. What you want is to move the top of the strut inward towards the firewall.
The Perrin PSRS is a great piece but its actually going to push your wheel towards the bumper even more. On my car I have the Ciro Design Racing plates along with the Perrin PSRS and my wheel is nice and centered. My tires are a little shorter than yours which is helping; theyre a 285/30 on 18x10.5 +30 with a 18mm spacer. Given that my wheels stick out further than yours which means they would be more prone to rubbing that front portion.
But your issue here is most likely two-fold one being your tall tires and the other being your plates not yielding enough caster.
Im not familiar with the K-mac plates as far as how much additional caster you can achieve but looking at your picture you don't have it on the max caster setting. What you want is to move the top of the strut inward towards the firewall.
The Perrin PSRS is a great piece but its actually going to push your wheel towards the bumper even more. On my car I have the Ciro Design Racing plates along with the Perrin PSRS and my wheel is nice and centered. My tires are a little shorter than yours which is helping; theyre a 285/30 on 18x10.5 +30 with a 18mm spacer. Given that my wheels stick out further than yours which means they would be more prone to rubbing that front portion.
But your issue here is most likely two-fold one being your tall tires and the other being your plates not yielding enough caster.
#798
EvoM Staff Alumni
iTrader: (3)
^^^
Best thing is to get you to a race shop for a proper alignment, including adding some positive caster, but not too much that will negatively impact straight line stability
BTW, one site shows that tire dia at 650mm which is tall but not that bad. And the section width is 10.88 compared to my Federals at 10.80 (265/40) or my Nitto NT05's at 10.79 (275/40)
Best thing is to get you to a race shop for a proper alignment, including adding some positive caster, but not too much that will negatively impact straight line stability
BTW, one site shows that tire dia at 650mm which is tall but not that bad. And the section width is 10.88 compared to my Federals at 10.80 (265/40) or my Nitto NT05's at 10.79 (275/40)
Last edited by MinusPrevious; Sep 14, 2016 at 07:52 AM.
#799
Evolved Member
iTrader: (1)
For starters as minus mentioned those tires are pretty tall which isnt helping your case.
Im not familiar with the K-mac plates as far as how much additional caster you can achieve but looking at your picture you don't have it on the max caster setting. What you want is to move the top of the strut inward towards the firewall.
The Perrin PSRS is a great piece but its actually going to push your wheel towards the bumper even more. On my car I have the Ciro Design Racing plates along with the Perrin PSRS and my wheel is nice and centered. My tires are a little shorter than yours which is helping; theyre a 285/30 on 18x10.5 +30 with a 18mm spacer. Given that my wheels stick out further than yours which means they would be more prone to rubbing that front portion.
But your issue here is most likely two-fold one being your tall tires and the other being your plates not yielding enough caster.
Im not familiar with the K-mac plates as far as how much additional caster you can achieve but looking at your picture you don't have it on the max caster setting. What you want is to move the top of the strut inward towards the firewall.
The Perrin PSRS is a great piece but its actually going to push your wheel towards the bumper even more. On my car I have the Ciro Design Racing plates along with the Perrin PSRS and my wheel is nice and centered. My tires are a little shorter than yours which is helping; theyre a 285/30 on 18x10.5 +30 with a 18mm spacer. Given that my wheels stick out further than yours which means they would be more prone to rubbing that front portion.
But your issue here is most likely two-fold one being your tall tires and the other being your plates not yielding enough caster.
What is an acceptable caster range? There aren't any "race-shops" in the area, but I can get a good alignment to my specification.
Also I can't get a PSRS (discontinued) . What can/should I get instead? Is there anything that will more the tire further forward from the bottom?
#800
EvoM Staff Alumni
iTrader: (3)
Heres a AX thread on caster. Seems like 5-6 degrees of caster is noted as optimum
https://www.evolutionm.net/forums/mo...autocross.html
https://www.evolutionm.net/forums/mo...autocross.html
#802
EvoM Guru
iTrader: (1)
Also, that tire is the same height as a 275/35r18 (25.6"), so it's not too big. It's definitely doable. Find a Perrin PSRS kit, or go with the whiteline KCA400m to add caster and move the tire forward a bit.
#804
Evolved Member
iTrader: (41)
Wait crap I looked at the picture wrong. So disregard what I said above Rjones is right. I thought I was looking at a picture of the front of your bumper and your lip not the rear and sideskirt. In that case the plate is moving it in the wrong direction and the PSRS is what you need.
IIRC the whiteline piece doesnt add as much caster. There is also a superpro version but I think that is the same story. Supposedly Perrin still makes a PSRS for a subaru that is the same part. I guess the only catch is that it may not include the necessary spacers.
IIRC the whiteline piece doesnt add as much caster. There is also a superpro version but I think that is the same story. Supposedly Perrin still makes a PSRS for a subaru that is the same part. I guess the only catch is that it may not include the necessary spacers.
#805
EvoM Guru
iTrader: (1)
On my car, the perring moved the tire too far forward. I had to trim the front of the inner fender liner. That's is of course easier than finding clearance at the rear of the fender well. I wan to say the whiteline does about 1/2 of what the perrin does. So it should work fine. When you look up the whiteline, it will say its for an Evo X, but it still fits the 8/9...
#806
Evolved Member
iTrader: (41)
Yeah agreed the PSRS without plates up top moves the wheel too far forward. When I run my winter setup stock VIII wheels stock tire size my coilovers come off and the wheel is no longer centered. It didnt rub gets very close but my 255/40 and my 285/30 both would hit.
So in this case where the wheel is rubbing the back not the front, duh Im dumb...thats because of your added caster with the plates. Caster is good dont dial it back but better yet get an offset bushing in the LCA and move it forward some.
Im thrilled that my setup with caster maxxed out at the plates and the PSRS centers it perfectly and yielded more caster than other offset bushings and I believe more caster than any other plates on the market.
And yes, as Letsgetthisdone stated if it fits the X then it fits our cars too. I'd look into sourcing a PSRS, might be worth calling Perrin and getting the scoop on the spacers. I know what they look like but I dont have specific measurement for you so cant help you in that regard.
So in this case where the wheel is rubbing the back not the front, duh Im dumb...thats because of your added caster with the plates. Caster is good dont dial it back but better yet get an offset bushing in the LCA and move it forward some.
Im thrilled that my setup with caster maxxed out at the plates and the PSRS centers it perfectly and yielded more caster than other offset bushings and I believe more caster than any other plates on the market.
And yes, as Letsgetthisdone stated if it fits the X then it fits our cars too. I'd look into sourcing a PSRS, might be worth calling Perrin and getting the scoop on the spacers. I know what they look like but I dont have specific measurement for you so cant help you in that regard.
#807
Evolved Member
iTrader: (17)
I was running ichiba spacers and studs. I have ARPs now and will torque higher than 85 ft/lbs
I noticed when i drive on spacers and drive hard the wheel loosens up. I'm wondering if the aluminum spacer is expanding and contracting a bit to create loose lug nuts
#808
Evolved Member
iTrader: (41)
Whatsup James!? I haven't seen you on here in forever...sucks to hear about your incident; you musta been pulling mad g's yo!
For starters I dont care for the bolt on spacers so I think you'll have better luck with the slip ons and some ARP's.
However Im in complete agreement with your last sentence. Im running something like a 17mm spacer and ARP's and I've also had the wheel fall off on me if Im not diligent about re torquing the studs. I believe it has to do with the repeated heat cycles. I torque my studs before an event and halfway through just to be sure. I did a Sat Sun event and forgot to retorque them on Sunday and at one point my wheel started shaking. I was like WTF went checked torque on the studs and they were finger lose. Lets just say I was super lucky but it scared the **** outa me.
And FWIW I've always torqued to 90 ft/lbs. There was a discussion on the proper spec before they stretch and I dont recall exactly what it is but I wouldnt just assume that going tighter is any better.
For starters I dont care for the bolt on spacers so I think you'll have better luck with the slip ons and some ARP's.
However Im in complete agreement with your last sentence. Im running something like a 17mm spacer and ARP's and I've also had the wheel fall off on me if Im not diligent about re torquing the studs. I believe it has to do with the repeated heat cycles. I torque my studs before an event and halfway through just to be sure. I did a Sat Sun event and forgot to retorque them on Sunday and at one point my wheel started shaking. I was like WTF went checked torque on the studs and they were finger lose. Lets just say I was super lucky but it scared the **** outa me.
And FWIW I've always torqued to 90 ft/lbs. There was a discussion on the proper spec before they stretch and I dont recall exactly what it is but I wouldnt just assume that going tighter is any better.
#809
Evolved Member
iTrader: (17)
Whatsup James!? I haven't seen you on here in forever...sucks to hear about your incident; you musta been pulling mad g's yo!
For starters I dont care for the bolt on spacers so I think you'll have better luck with the slip ons and some ARP's.
However Im in complete agreement with your last sentence. Im running something like a 17mm spacer and ARP's and I've also had the wheel fall off on me if Im not diligent about re torquing the studs. I believe it has to do with the repeated heat cycles. I torque my studs before an event and halfway through just to be sure. I did a Sat Sun event and forgot to retorque them on Sunday and at one point my wheel started shaking. I was like WTF went checked torque on the studs and they were finger lose. Lets just say I was super lucky but it scared the **** outa me.
And FWIW I've always torqued to 90 ft/lbs. There was a discussion on the proper spec before they stretch and I dont recall exactly what it is but I wouldnt just assume that going tighter is any better.
For starters I dont care for the bolt on spacers so I think you'll have better luck with the slip ons and some ARP's.
However Im in complete agreement with your last sentence. Im running something like a 17mm spacer and ARP's and I've also had the wheel fall off on me if Im not diligent about re torquing the studs. I believe it has to do with the repeated heat cycles. I torque my studs before an event and halfway through just to be sure. I did a Sat Sun event and forgot to retorque them on Sunday and at one point my wheel started shaking. I was like WTF went checked torque on the studs and they were finger lose. Lets just say I was super lucky but it scared the **** outa me.
And FWIW I've always torqued to 90 ft/lbs. There was a discussion on the proper spec before they stretch and I dont recall exactly what it is but I wouldnt just assume that going tighter is any better.
I was running ichiba slip on spacers and ichiba extended studs. So I think you are right. I noticed in the past that it was loosening but I was codriving with a friend and we forgot to check lugs in the middle of the runs so so I'm sure they were loose as I have had them loosen up before. I'm not sure tighter is better because of strength the stud as well.
#810
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hey dude!
I was running ichiba slip on spacers and ichiba extended studs. So I think you are right. I noticed in the past that it was loosening but I was codriving with a friend and we forgot to check lugs in the middle of the runs so so I'm sure they were loose as I have had them loosen up before. I'm not sure tighter is better because of strength the stud as well.
I was running ichiba slip on spacers and ichiba extended studs. So I think you are right. I noticed in the past that it was loosening but I was codriving with a friend and we forgot to check lugs in the middle of the runs so so I'm sure they were loose as I have had them loosen up before. I'm not sure tighter is better because of strength the stud as well.