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Thread: TRACK: troubles at autocross Reply to Thread
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Topic Review (Newest First)
09-08-2006 06:23 PM
WD40 ^^^At least you had the sense of mind to pull over and gather up your composure.
09-08-2006 12:58 PM
eazyrider_tim
Quote:
Originally posted by WD40
^^^Nope...
An underinflated tire will be much more likely to hydroplane and is extremely dangerous.
When you hit standing water in an underinflated tire, the center of the tire will deflect and become concave "cupping",
and will end up floating on top of the water=hydroplaning.

By increasing the psi in the tire, you will negate the "cupping" effect.
1) It will have a narrower and shorter contact patch.
^^^Results in greater psi between the tire and the road.
2) The profile will be more round, and will not be able to deflect as much.
^^^Read, resitance to cupping.
3) It helps keep the grooves in the tread open so they can channel water out from under the tire.
^^^Again, a underinflated tire will deflect, and many times close off the grooves that channel water.

OK...just to verify...the experts say the same thing:
http://www.tirerack.com/tires/tirete...e.jsp?techid=3
yeah, you are correct I know from experience on a trip to/from San. An....it rained HARD. I was in my Probe, I floated from the far left lane to the grass on the right shoulder.....all because my psi was low in my two fronts..... I was so messed up and shaking I had to sit in a parking lot for an hr to convince myself it was safe to drive.....
09-01-2006 01:41 PM
justin025
Quote:
but I guess I was imagining things
i do that alot...
09-01-2006 11:50 AM
Carrera26 Hmmmm, It always felt the other way around for me when I have been out in the rain, but I guess I was imagining things...
08-31-2006 05:14 PM
WD40 ^^^Nope...
An underinflated tire will be much more likely to hydroplane and is extremely dangerous.
When you hit standing water in an underinflated tire, the center of the tire will deflect and become concave "cupping",
and will end up floating on top of the water=hydroplaning.

By increasing the psi in the tire, you will negate the "cupping" effect.
1) It will have a narrower and shorter contact patch.
^^^Results in greater psi between the tire and the road.
2) The profile will be more round, and will not be able to deflect as much.
^^^Read, resitance to cupping.
3) It helps keep the grooves in the tread open so they can channel water out from under the tire.
^^^Again, a underinflated tire will deflect, and many times close off the grooves that channel water.

OK...just to verify...the experts say the same thing:
http://www.tirerack.com/tires/tirete...e.jsp?techid=3
08-31-2006 01:42 PM
Carrera26 ^^^Seems to me like that should be the other way around. Lower PSIs in the wet and higher PSIs in the dry.
08-30-2006 10:20 PM
justin025 yeah its 30 min from me too looking forward to it. oh and what tire pressures do you run, you have 15's don't you. i was running 35,30 on dry and 45,40 on wet
08-30-2006 02:54 PM
frenzy_20 Yeah, I'll deffinatly be at the one in Lima, its only 30min from here. I've heard its alot of fun there, they haven't had any there yet this year and I thought they couldn't get it anymore.
08-30-2006 12:21 PM
justin025 sweet nice to know someone from the forum was there! are you going to the one in lima ohio is is sopposed to be HUGE!#$@% yeah i was the green one that was hitting all the cones. now i realize that i need to drive slow to drive fast. i would really like to meet ya if you come to the lima one. its the only green hatch in the world!!!! well close
08-30-2006 12:02 PM
frenzy_20 Just keep running the events, you get much better as you learn to drive better. I started last october, on the same coarse a month ago, my time was 4 seconds better.
Btw, I was in the red sedan, its an 05, the grey ZX3 was a 06, I don't know what his mods where, but I know the wheels and suspension were stock at least. Thats a pretty bad experience for a first autocross, wet all day and one good run. Good luck at the airport.
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