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Old 12-12-2002, 10:54 AM   #1
BlueRidgeAutoX
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Default R Compound DOT Tires for AutoX Stock

I have researched a little what is available in R compound DOT tires for the stock wheels on my 2001 2.5RS (16X7). I would like to go with Kumhos (for the economy), but would consider Hoosier or Michelin. What sizes and brands are people using in Stock Classes?

Kyle
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Old 12-12-2002, 10:59 AM   #2
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Those are the two top brands, Kumho and Hoosier.

A Kumho will generally last longer, and cost less than an Hoosier on a stock suspension due to the max camber you can get out of the car (-1.5ish). You'll round corners before you finish the rest of the tire.

Kumho would be your best bet...

--kC
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Old 12-12-2002, 11:02 AM   #3
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Kumhos - 225/50/16 is the "general" size. Its also possible to go 245/45/16 on the front, but not on the rear. Source: www.subrew.com

Hoosiers - 225/50/16 is possible. 215/40/16 is the best choice though because of the better gearing. You will have to shift to 3rd anyways, so these tires will just make you shift a little sooner.

IMHO, the best idea is what I did. Run 225/50/16 Kumhos at the local events, and then buy a set of 215/45/16 Hoosiers for the national events.

-Tom
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Old 12-12-2002, 11:04 AM   #4
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BFG is supposedly coming out with a new R this spring. if its anything like the R1s, screw the kumhos
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Old 12-12-2002, 01:24 PM   #5
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Tom-

I was concerned about a 225 rubbing, yet you have ran 245's...I assume there is no issue with the 225's? Also, are you running stock shocks with this and also, stock wheels?

Kyle
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Old 12-12-2002, 02:05 PM   #6
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You guys are talking about two TOTALLY different cars. Tom runs a WRX. You won't be able to fit a 245 on your RS without some fender massaging... I ran 205/45/16 Hoosiers and they seem to work well on the RS. I would have liked to go wider but wasn't willing to roll fenders or anything... And the gearing advantage made the car feel really quick.

You will also have issues with the 225's, but that can be solved with rolled fenders. The Kumho 225 should fit better than the Hoosier also, if you do decide to try and make a 225 work.

By the way, I have a set of 205/45/16 Hoosiers for sale. About 10 runs on them. They still have the circumference grooves in them. Almost brand new.

Corey #89
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Old 12-12-2002, 02:40 PM   #7
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Geez guys, there is a REASON I posted subrew.com

Please look at http://www.subrew.com/library/kumho_comparo/

-Tom
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Old 12-12-2002, 02:42 PM   #8
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Corey-

Thanks for the clarification between models...I assumed (you know what that means) that the '02+ RS & WRX took the same tire as my '01 RS.

It looks like Kumho has the ECSTA V700 in a 205/46-16 as well as Hoosier in the "road race" compound.

Kyle
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Old 12-12-2002, 02:43 PM   #9
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Quote:
Thanks for the clarification between models...I assumed (you know what that means) that the '02+ RS & WRX took the same tire as my '01 RS.
It can. Running on 205s would be like shooting yourself in the foot.

Like I said, have you looked HERE --> http://www.subrew.com/library/kumho_comparo/

-Tom
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Old 12-12-2002, 02:53 PM   #10
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Tom-

Thanks for the link...good info through-out the site...although some of the material is the same as I have read in GRM.

Kyle
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Old 12-12-2002, 03:02 PM   #11
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Chris writes for GRM sometimes

-Tom
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Old 12-12-2002, 03:49 PM   #12
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Tom-

Uh...OK...so I just looked at the credits for the article in the March 2002 GRM...it does list Chris as the writter with contributions from others and it has the Subrew.com URL...I guess that would have been a good place to start.

It was easier for me to get info when I had the Cobra as there was not as much info out there (at least for AutoX; for street hot rodders and drag guys, there was plenty). For the Impreza, it seems like there are a billion sites and ones like this require a bit of digging (although I am still learning what it has). Of course, I have only had the car for a week and I am mostly just surfing in spare moments while I am at work, so I have plenty of learning to do yet.

Thanks
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Old 12-12-2002, 04:21 PM   #13
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It's pretty easy to make 225s fit on an '01. It honestly takes less than 5 minutes to roll the rear fenders and there is usually little to no paint cracking.
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Old 12-12-2002, 04:36 PM   #14
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I would suggest doing a lot of surfing

Seriously.....run searches and whatnot on here and you will find a WEALTH of information.

-Tom
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Old 12-12-2002, 04:50 PM   #15
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To summarize:

225/50-16 Kumho Ecstas fit my car and teammate Sean's lowered DSP car both '99 2.5RSs both front and rear. I have zero rubbing in the back on my stock class car, which has KYB struts currently. Stock struts will cause the car to have more body roll and squat (during acceleration) and may cause some rubbing.

225/50-16 Kumho victoracers rub on the fender lip slightly, strut body slightly, and the lower spring perch a bunch, until you wear a 1/2-inch wide bevel on the shoulder of the tire. Sean has no fender lip molding and lightly rolled fenders, and does not rub on his lowered car.

In stock class, you cannot remove the fender lip molding, or roll the fenders, so that is not an option.

225/50-16 Hoosiers are roughly 1/8-inch wider than the victoracers, so they will not mount up on the RS without a thin spacer, to keep them off the struts and spring perch. This will cause rubbing on the fender lip molding, and you will rub through the molding in short order. You will need to replace the molding to be legal.

225/50-16 Yokohama A-008RSIIs are even wider (believe it or not) and I had to use a 3/16-inch spacer in the back, and it wore through the fender molding in only a couple runs. That was a couple years ago though.

245/45-16 Kumho victoracers fit on the front with no rubbing issues on my car. On Sean's lowered car, they rubbed the inner fender liner.

205/45-16 Kumho Ecstas fit fine, and do lower the gearing. Andrew Howe from Oregon ran these last year. I believe the gearing hurt him more than it helped him.

215/40-16 Hoosiers should fit fine, and have similar gearing issues.

For a ProSolo where we will be in third anyways, it may be a nice advantage. For an event where we are nipping the limiter in 2nd gear several times (Pro Finale for example or Atwater, CA Pro,) it would hurt to have to shift 3 or 4 times in 30 seconds.

I have no experience with Michelin's Pilot Cup Sport or any BFGs.

I hope this info helps.

Chris H.
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Old 12-12-2002, 05:07 PM   #16
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Quote:
Originally posted by trhoppe
Geez guys, there is a REASON I posted subrew.com

Please look at http://www.subrew.com/library/kumho_comparo/

-Tom
Tom,

I've read what Chris said in his articles. My findings are somewhat different, however, that's why I posted MY OPINION! I have had rubbing issues with tires on the front and rear, and have fitted several also. Obviously the 205/45/16 isn't ideal, but it fits, and works.

Corey #89
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Old 12-12-2002, 08:11 PM   #17
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Quote:
Originally posted by Corey


Tom,

I've read what Chris said in his articles. My findings are somewhat different, however, that's why I posted MY OPINION! I have had rubbing issues with tires on the front and rear, and have fitted several also. Obviously the 205/45/16 isn't ideal, but it fits, and works.

Corey #89
Could you give us some more specifics? What tire test fits have you done? What suspension are you using? What rubbed, what didn't?

More info is always better. That way we could all judge based on facts and not opinions. Documenting your tests with photos and a write up would also help.

Not flaming, just trying to help spread the wealth of knowledge. If people are really having trouble with the same setup Chris and I have both used, on GS and DSP RSes, then we need to figure out what's different, and document it.

Sean
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Old 12-12-2002, 08:57 PM   #18
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Sean,

Sure, I can provide you with some specifics, but can't provide alot of picures, as most of the tires weren't my own, or I don't have them any more.

Here are some tires that I have tried, though not all are R-componds, which this thread is about.

STS tire/rims

205/50/17 BFG KD on SSR Competition 17X7.5 Rubbed F&R on fenderwell. (probably the worst of all)

215/45/17 Bridgetone SO-3 on SSR Competition 17X7.5 Rubbed F&R on Fenderwell.

205/55/16 BFG KD on Stock 16X7. Rubbed Rear on fenderwell.

R compound tires (Ran in SM)

205/55/16 Yokohama A032R on Stock 16X7. Rubbed on Rear fenderwell. (I can take a pic of this tire)

225/50/16 Kumho on Stock 16X7. Rubbed on front fenderwell, on rear Strut, and on rear fenderwell.

215/40/16 Hoosier. Didn't drive on but was even with middle of fenderwell in rear.

205/45/16 Hoosier. FIT!

Most of my fitment trials were with STI Ver.6 struts and springs. As you can clearly see, I have even had stock size tires rub on my car. My alignment was set using stock camber adjustment to max-neg F&R. About 1.3F and .75R. (I loosened up all rear bolts, pushed in hard, and re-tightened.)

Hope this helps.

Corey
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Old 12-12-2002, 11:37 PM   #19
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I've run a different bag of tires than most, so I've got a little insight about stuff others may not have tried. On my GS class '00 RS, I've run Yoko A032R's (205/55/16) and Kuhmo Ecsta V700's (205/45/16).

The Yokos fit well. No rubbing anywhere. They definitely gave up some grip to the Kuhmos and Hoosiers. Good tire wear. They hum like crazy, but the gearing is right. No problems with the stock springs and struts.

The Kuhmos fit well, too. Probably because of the small size. Great grip, good tire wear. The gearing sucks!!! At least it did for the events I ran last year.

The Atwater Pro was miserable for gearing. I only made two shifts (1-2, 2-3) but I had to ride 3rd through the 90 - 90 turn around. The exit speeds were in the neighborhood of 40-45mph. Too high for effective use of 2nd, but too low for effective use of 3rd.

At the Bremerton NT, I made more shifts than should be legal. I'm positive the gearing cost me a trophy (ok, so it wasn't the only thing that cost me a trophy ). I think it was 1-2, 2-3, 3-2, 2-3, 3-2 and then through the lights riding the limiter. The course lived between 35 and 55 mph, using that whole range. Just too wide for my gearing.

Bluntly put, I won't run the 205/45/16 again. I test fit the 225/50/16 Ecsta (thanks Chris!) and it fit without a static rub. I'm positive it will rub the spring perch under corner loads, but I can live with that - my snow tires do the same thing. I plan on running the Ecsta 225/50/16's all year (shaved to 4/32nds - don't run the Ecstas full tread unless you're on a budget.)

Andrew
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Old 12-12-2002, 11:44 PM   #20
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Default Toyo RA-1s

I haven't seen in this post or even searching a lot about the Toyos. They come in the stock size. Why does it seem that not too many people are running on them? Or did I miss it in searching?

Thanks,

Craig
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Old 12-12-2002, 11:55 PM   #21
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The RA-1s are great track tires and last a long time, but they are not as sticky nor as fast as the Kumhos or the Hoosiers.

-Tom
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Old 12-13-2002, 12:01 AM   #22
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Tom (and others):

I assume they are still stickier than the Falkens? I picked up a used set of the Toyos for cheap and am planning on using them next year for autocross. But am I better off sticking with the Falkens?

Craig
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Old 12-13-2002, 12:14 AM   #23
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Depends on how old they are and if they are heat cycled out. Brand new for brand new, the Toyos would beat out the Falkens any day. They will also not go away with heat like the falkens do.

Unless the Toyos are really old, they should be better.

-Tom
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