Sidewall flex, need answers
Sidewall flex, need answers
I am working on my new wheel tire setup:
Enkei PF01 18x10.5 +38, 275/35/18 Hoosier A6's.
So using 16mm of spacers and setting the eccentric bolt to the '1 degree' position here is the clearance I have between the bottom of the spring/perch on my AST and the tire:
That's about 5/8 of an inch. This tire wheel setup should have very minimal sidewall flex, that's one of the reasons I went with it. Hoosier reccomends +/- 0.5 inches from tread width to rim width. The 275 is listed as a 10.3 inch tire, so the 10.5 is in their desired window.
Is that 5/8 of an inch going to be enough? Or should I get a thicker spacer?
Enkei PF01 18x10.5 +38, 275/35/18 Hoosier A6's.
So using 16mm of spacers and setting the eccentric bolt to the '1 degree' position here is the clearance I have between the bottom of the spring/perch on my AST and the tire:
That's about 5/8 of an inch. This tire wheel setup should have very minimal sidewall flex, that's one of the reasons I went with it. Hoosier reccomends +/- 0.5 inches from tread width to rim width. The 275 is listed as a 10.3 inch tire, so the 10.5 is in their desired window.
Is that 5/8 of an inch going to be enough? Or should I get a thicker spacer?
the tire doesn't move much at the top. if you can fit a finger in there you're good.
That said, you're going to want more negative camber. so you might need bigger spacers anyway once you crank the eccentric bolt to the -2 setting.
That said, you're going to want more negative camber. so you might need bigger spacers anyway once you crank the eccentric bolt to the -2 setting.
Last edited by griceiv; May 5, 2014 at 08:31 PM.
I think I can get it out of the camber plates, Been running 3.6 and they are in the middle.
Andy, the rears have already been rolled and slightly pulled. I have the RTErnie trailing arms so the rears use no spacers, plenty of trailing arm clearance. So with the wheel bolted straight on the hub, it tucks under the rolled fender nicely. I'll get some pics.
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I have in the past been cording the outside edge of Ho-Ho's while there was still lots of tread (still good depth to the wear dimples) on the inside, at least on the fronts.
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Joined: Mar 2002
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From: Reading, MA
To the OP...is that max tire size you could use for your car? 285s will be shorter to help with torque and less of sidewall, plus more thread on the road?
As of the amount of camber...it is not a clear cut by any means. So many other things have effect on how much YOU need. If you car would be driven with different driver, chances are that camber requirements might be different. Spring stiffness is another thing that controls how much of camber is needed. Softer the springs - car will lean more and you would need more camber to keep the tire at optimal position compare to the road.
On the same page, is you are running lots of low speed compression on that end, it will slow down how much lean you will get from the body as well.
Type of tires and their grip levels will have great impact on how much camber you will need. I have switched to the street tires this year and amount of roll I am getting is significantly less then last year when running Hoosiers.
Last, but not least, driver level will have an impact to the amount of camber car needs to have as well. Better driver will be able to get out of the car more compare to the less experience one. And, the most important aspect is how smooth the driver is. More of jerky drivers (even when they are fast) will be able to push that tire into the positions that would require more camber and that would temporarily overdrive the tires. The thing is that this excessive load is kept much shorter than a smooth driver can do, so the difference in camber needs vary as well.
Fedja
As of the amount of camber...it is not a clear cut by any means. So many other things have effect on how much YOU need. If you car would be driven with different driver, chances are that camber requirements might be different. Spring stiffness is another thing that controls how much of camber is needed. Softer the springs - car will lean more and you would need more camber to keep the tire at optimal position compare to the road.
On the same page, is you are running lots of low speed compression on that end, it will slow down how much lean you will get from the body as well.
Type of tires and their grip levels will have great impact on how much camber you will need. I have switched to the street tires this year and amount of roll I am getting is significantly less then last year when running Hoosiers.
Last, but not least, driver level will have an impact to the amount of camber car needs to have as well. Better driver will be able to get out of the car more compare to the less experience one. And, the most important aspect is how smooth the driver is. More of jerky drivers (even when they are fast) will be able to push that tire into the positions that would require more camber and that would temporarily overdrive the tires. The thing is that this excessive load is kept much shorter than a smooth driver can do, so the difference in camber needs vary as well.
Fedja
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From: Columbia, MD
I run -3 degrees front and see even temps with a digital pyrometer (outside/middle/inside) but I'm still wearing the outside front left and inside front right very hard so I think I still need a bit more camber to flatten out the wear pattern.
