THSCC Forums

Thanks. That is the part I was having trouble with. At some point squeezing big tire on little rim seems to be diminishing returns. I guess I thought it was a lot sooner. I'd love to see pictures of actual contact patch sitting on the ground with some of these setups. I suppose if you drop your air pressure down you can control some of the rounding? How about fear of popping the tire clean off the rim in the middle of a hard turn. Like a turn around?

_________________
http://www.greywinds.com

While we will never run dangerously low pressures (we will probably be in the low 30's), with the way it is squeezed onto the rim along with rim protector, I am betting we could run 12 psi and not have it de-bead. I'll take some pics of our other set of mounted 295/30/18's against the 315/30/18's, both on OEM rims. I should have those next Thursday morning. - AB

_________________
'14 Toyota Sequoia Platinum 4WD
Super Westerfield Bros - '93 Integra - LeChump Du Jour
STX 93 - Scion FR-S

I saw Feinberg's 275 on the 6" rim for the first time this afternoon. It's not as badly squeezed on there as I thought. Definitely a good bit more contact patch than the 225 on the same rim. And like Buckley said, I don't think there's any worry of debeading one. If you could see any kind of extra air in that rim protector area between rubber and rim I'd be worried, but it looks just fine. I can't see it being an issue at all.

Apparently Mark Cooper said that mounting the 275's on the 6" rim was actually *easier* than doing the 225's on the same rim (and I've done a lot of the 225's on 6" rims...I don't think those are terribly hard) for some reason. Go figure.

I think the days of it being best to run the tire that best "fits" the rim are long gone. Sure, if you run in a class where there's no limit on rim width, go with the rim you should use. But if you have a limit, well, stuff as much Hoosier on there as you can make fit and run it. *shrug*


--Donnie

_________________
My Blog

Did anybody notice that Jim won DS at the Arkansas Pro this past weekend (I think it was this past weekend) and that Spratte was right on his heels in 2nd? I don't remember all the results, so apologies if I'm leaving out some other local notables.

That Type R is on a tear this year!! Way to go, guys!!!

Actually, Spratte coned away beating Jim. That said, they were on old tires on Saturday and Jim only took two runs on Sunday to scrub the tires for David, who then took all four of his runs. Actually, wait, I think Jim took all four runs but badly red-lit his first couple on purpose or something like that. He was both trying to make sure David had a good shot at making the challenge (David was way back on day 1) and take some sand to the challenge for himself.

I didn't do nearly as well as those two monsters. I co-drove with Jesse Caudill in his ST Civic. I've never autocrossed FWD before, and my only street tire experience is a couple times in the STi at local events and I ran an STS2 Miata at the Packwood ProSolo a couple years ago (where I somehow made the final four of the challenge).

On top of that, Jesse wasn't going to be at the site until the middle of the night on Friday night, so I couldn't do practice starts in the car. Heyward and David O'Maley let me use their car to do starts, which helped, but they were on Toyos and Jesse's car was on 'Stones, so it wasn't exactly the same.

Anyway, I gotta say, I kinda liked that thing. It was pretty fun. It did take some getting used to, but not as much as I thought it would. The only drawback is those tires do overheat fairly quickly, though they don't drop off as bad as Hoosiers do when they go over the edge, either. But both my Saturday afternoon and Sunday morning runs were only good for my first couple before the tires were noticeably worse.

I still managed to cone away a run that would have put me .4s off Jesse, who won the event (and beat Jim in the Honda Challenge) in my last run of the event (with the last cone on course!). That would have only moved me from fifth to fourth, but it would have put me in the challenge. Oh well.

I'll be driving Andy Hollis' ST Civic at the Packwood ProSolo this year as well as at the Finale. Should be an even better car. We'll see...


--Donnie

_________________
My Blog

Congrats to Jim and David!

A ProSolo does sound like a lot of fun. I took a look at the 60' times, and if you look at D-Stock, wow, what a 60' time the 3rd place Subaru pulled, a 1.889 sec versus 2.339, 2.375 for Jim and David in the Acura.

Are these 60' times recorded identically to those at the strip? Noob question, I know, but I've never really looked at ProSolo timing. I'm also curious how timing of a run works at a ProSolo. For example, do they start timing with the green light on, whoever gets to the line first wins? (and hence reaction time is a major component of your start). I would assume that's the case as opposed to timing your actual run from when the staged lights are uncovered. Also, is a perfect reaction time a 0.500 (and anything less is a red light)?

In any event, at the 60' point in would appear that the Sub was almost 0.5 seconds ahead. Not too surprising for AWD rev/dump/power launch of course, but in a head-to-head with one, I would have to mentally rehearse that thing opening up a huge lead out of the hole, so I wouldn't screw up my run worrying about "reeling it in", etc.

_________________
Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2

All your assumptions are correct on the timing, with the lone exception that the 60' measurement isn't always insanely accurate from event to event. My STi pulled the fastest 60' time of the entire event at Wendover three years ago, and there was an SM Evo there. It was a 1.67 or something incredible like that. It was my first launch of the event on bone cold tires. It was a red-line clutch dumper (with throttle flutter to maintain boost) and the theory was that the cold tires helped since they spun a good bit more than they otherwise did as more rubber got put down and everything was softer and that kept the car on boost better. That was everyone else's theory, my theory was that I'm just a bad-ass to 60'. It's after that when I got all to crap.

As for the mental part, well, it's there, but *I* have never found it hard to tune out the other driver. The courses are always setup such that you'll be able to see your competitor at some point and gauge well who is ahead during a run, but I never notice it. And having a Subaru pull you like that is just good practice for the Challenge since it's possible you could face a car with a slower dial-in than you and thus will be allowed to leave earlier.


--Donnie

_________________
My Blog

Staging the AS S2000 next to an AS STI is a pretty ego shattering experience. And my car doesn't cut horrible lights. Eric and I have managed some sub 2.0 second lights, like 1.9s maybe? We'll find out in a week at DC.

_________________
Karl S.
2014 Baby, 2014 House, 2013 Ford Focus ST, 2013 BMW 328i, 1994 Mercedes E320
(Insert passive aggressive signature line here)