285/30/18 issues?
285/30/18 issues?
Is anybody running this setup on an X for a while without an issue?
The reason I ask is when I was on the 1010tires' page comparing different sizes, it gave a warning stating:
"When changing tire sizes, we recommend staying within 3% of the diameter/height of the original tire. Any more than this and you face the risk of brake failure."
The difference is %3.82 from stock diameter.
Is this true? Will I have issues with my brakes?
I will be running these tires only at auto x and other events that requires ultimate grip. I will be swapping them with my DD setup once I am done with the events.
The reason I ask is when I was on the 1010tires' page comparing different sizes, it gave a warning stating:
"When changing tire sizes, we recommend staying within 3% of the diameter/height of the original tire. Any more than this and you face the risk of brake failure."
The difference is %3.82 from stock diameter.
Is this true? Will I have issues with my brakes?
I will be running these tires only at auto x and other events that requires ultimate grip. I will be swapping them with my DD setup once I am done with the events.
The other issue is that some cars with advanced (i.e., predictive) ABS can be thrown off by a large change in tire diameter. An Evo X has this, but I doubt that having the ABS be confused is much worse than having it not be confused when it comes to autocrossing. 
So will that cause car to apply ABS for no reason? Or anything else for ABS to go haywire?
here is the chart that compares different size to the stock size:
It is not at all crazy to go small for tires for autocrossing. Lower CG and better wheel torque. The question, as raised in the other thread, is whether the better torque can be used and whether it will force you to go to third too often.
As to the effect on the ABS: the system in an Evo X cuts brake-line pressure to the wheels that are predicted to lock up first. It's "predictive ABS" because it doesn't wait for lock-up and then react; it tries to prevent lock-up before it happens. My guts say that changing all four tires to being smaller won't be a big deal. What I hinted at above is how Mitsu Sport-ABS doesn't work so well when doing the extreme things that autocrossers do and a confused Sport-ABS system probably won't be noticeably worse.
In short, I'm not seeing a problem. But if the OP would please provide his or her date of birth and Social so I can take out a third-party policy, that would be cool.
As to the effect on the ABS: the system in an Evo X cuts brake-line pressure to the wheels that are predicted to lock up first. It's "predictive ABS" because it doesn't wait for lock-up and then react; it tries to prevent lock-up before it happens. My guts say that changing all four tires to being smaller won't be a big deal. What I hinted at above is how Mitsu Sport-ABS doesn't work so well when doing the extreme things that autocrossers do and a confused Sport-ABS system probably won't be noticeably worse.
In short, I'm not seeing a problem. But if the OP would please provide his or her date of birth and Social so I can take out a third-party policy, that would be cool.
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Only thing I can see causing issues to your brakes is the fact that you'll have more grip and create more heat while stopping. Youll only probably experience this if your track your car hard. But it won't be an issue. It'll be interesting trying to make those fit though.
Only thing I can see causing issues to your brakes is the fact that you'll have more grip and create more heat while stopping. Youll only probably experience this if your track your car hard. But it won't be an issue. It'll be interesting trying to make those fit though.
They are .4" wider than my current tires but they are a full 1" shorter. I am running -2.5f and -2r camber and my rear fenders are rolled. Do you think I will still have fitment issues?
Last edited by EvoX-11; Mar 6, 2012 at 09:05 AM.
OK, actually the difference in diameter is %3.125 not %3.82 as I posted before. I took the diameters on the tires I will actually be running, not the generic gestimation like 1010tires.
Stock tire (245/40/18)overall diameter is 25.6" and revs per mile 810
my Current Setup (275/30/19 hankook Evos) 25.6" and rev per mile 813
285/30/18 Ad08s overall diameter is 24.8" and revs per mile 837
24.8/25.6 = %3.125
Stock tire (245/40/18)overall diameter is 25.6" and revs per mile 810
my Current Setup (275/30/19 hankook Evos) 25.6" and rev per mile 813
285/30/18 Ad08s overall diameter is 24.8" and revs per mile 837
24.8/25.6 = %3.125
And for starspecs out gripping Ad08s
Depends on your power output I guess, but with 18x10.5 Volks with Hankook R-S3 tires are still very similar to the weight of stock 18.8.5 with stock Yokohama tires. Also the outside diameter is really close to stock and the same combo used on the Gates 311RS cars.
What kind of power levels are you running? If you are at 400+ crank HP I think any minor difference would be well worth the extra grip in the corners.
What kind of power levels are you running? If you are at 400+ crank HP I think any minor difference would be well worth the extra grip in the corners.
all the tests I've seen have the starspecs coming out on top of ad08's. but thats same size, not sure if you're talking about a 285 ad08 vs a 275 starspec
Oh god, I cant even imagine 285 starspecs, one tire will probably weigh like 35+ lbs