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Old 11-11-2005, 06:42 PM   #1
gc822
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Impreza GC8 rally x tire pressure

so I'm looking for some input from the experienced RallyXers...... I'm running my first Rally X tomorrow in Monticello NY. What is a good tire pressure to run on dirt?

-Mac
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Old 11-11-2005, 07:28 PM   #2
MarkA
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What kind of tires?
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Old 11-11-2005, 07:30 PM   #3
gc822
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Kuhmo Ecsta ASX All seasons

205/55/16
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Old 11-11-2005, 07:35 PM   #4
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say hello...i'll be the big guy with the camera
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Old 11-11-2005, 07:45 PM   #5
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i would say 40 just to be safe. I bet you could run aroun 36psi but 40 you will be fine for sure. And you can always lower your pressure If your but comes out alot drop the pressure a bit.
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Old 11-11-2005, 07:50 PM   #6
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Impreza GC8

yeah I ran 40psi @ all four at my last autoX, did very well. However first RallyX and want to make sure that I'm not running too high of a pressure for the dirt surface
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Old 11-11-2005, 08:06 PM   #7
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High pressures will only cost you an almost un-noticeable amount of traction but will make it much safer for you as it reduces the risk of blowing a bead. I'll second the recommendation for at least 40PSI.
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Old 11-11-2005, 08:14 PM   #8
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cool sounds good, anyone else have a recommendation?

thx guys BTW
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Old 11-11-2005, 08:47 PM   #9
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I third the atleast 40 pounds recommendation.
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Old 11-11-2005, 09:14 PM   #10
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I've run 38F/35R (cold) and never had a problem
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Old 11-11-2005, 09:55 PM   #11
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Start @ 40, work down slowly but do not drop below 35-36 or you will be tempting the fates for a blown bead.
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Old 11-11-2005, 10:02 PM   #12
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^^^ @ the last rallyX I saw 3 or 4 blown beads as the ruts got larger through the day. You will have a blast though and have fun getting sideways.
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Old 11-12-2005, 12:15 AM   #13
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I know this isn't going to be in time to help this weekend, and I'm going to be the odd-ball here, but...

Depending on how packed the dirt is and what kind of ruts/berms there are, I run anywhere from around 18F/20R up to about 28F/30R with my Hakka 1's. In about 6+ years of some serious Rally-Crossing I've NEVER popped a bead (had a valve stem rip in half, but that's another story ).

If you don't believe that it's possible, check out my right-rear tire in this shot that Tensen took a few years ago:



Personally, it's one of my all-time favorite photos

Just my $.02

Matt Kennedy
www.rockyroadracing.com
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Old 11-12-2005, 12:39 AM   #14
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very cool pic.......i am a compleate noob when it comes to rallyx

Why then do guys pop beads often? Is it just lack of skill? Where everyone kept doing was on a hard turn that had a deep bump right before the turn. If you didn't get on the brakes early enough you ran the risk of hitting the deep hole with your tires locked and turned.......then POP......rolly polly goes tire

BTW - very cool site. I wish I lived out there!!!!
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Old 11-12-2005, 04:08 AM   #15
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Surface conditions, sidewall stiffness, sidewall profile, wheels...

I ran 38/36 at my first one and was fine. Did have to do the back-and-forth dance a couple of times. Never knew brakes could be so loud with a stone stuck between the pad and rotor, hehe.

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Old 11-12-2005, 04:21 AM   #16
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Another vote for 40psi or above
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Old 11-12-2005, 03:11 PM   #17
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40 or above? damn that seems high but try it out.

I rolled the bead on one last weekend and I think we were running like 35
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Old 11-12-2005, 03:25 PM   #18
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I did blow a bead once at 40psi but never had a problem other than that (sliding around a hairpin).

I've just always did 40psi as the Rally-x instructors told us and I have been fine with that.
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Old 11-12-2005, 06:19 PM   #19
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I usually run about 26-28 psi for rallyX tires (Kumhos and Pirelli's). The proper rally tires have stiffer sidewalls and so are far less likely to roll off the bead. Drop the pressure down!
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Old 11-13-2005, 12:41 AM   #20
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depends on tire mainly.. I had a set of BFG all weather and they just sucked butt @ any PSI (I tried anywhere between 35-50 with no success); but my current set of KDWS tires I just ran @ 31 PSI today without any issue.
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Old 11-13-2005, 07:27 PM   #21
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thanks again guys, the Rally X was a blast, ran 40psi and then dropped to 38, next time def getting better tires.
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Old 11-13-2005, 07:58 PM   #22
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Nice! Any pics from the event? How'd you do?

-B
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Old 11-13-2005, 10:24 PM   #23
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Quote:
Originally Posted by Beanboy
Nice! Any pics from the event? How'd you do?

-B
did decent, had a blast....

here is the link to the Rally X thread/pics- I'm the green Impreza L #27, you'll have to look through the album

LINK

Last edited by gc822; 11-14-2005 at 11:14 AM.
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Old 11-14-2005, 10:06 AM   #24
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I typically run with 37F 39R (on 15" gravel tires). I alter the pressure in the rears depending on how sideways I need to get....but it all depends on your suspension setup/adjustablility, tire type/size, surface, outside temps. etc.

pic link?

Last edited by AlbaScoob; 11-14-2005 at 10:19 AM.
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Old 11-14-2005, 11:15 AM   #25
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oops, added the link above or here it is again
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