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Old 08-13-2014, 12:10 AM   #181
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Quote:
Originally Posted by EricJ View Post
No, that's a forum post. Andy Hollis did tire testing articles, IIRC, two months in a row. The first one briefly mention the Rivals and the second went into more depth. I'm thinking it was 8 or 9 months ago. I'd have to dig through my 'paper' magazines to find them. The guy who helped him with the testing AutoXs and runs NASA TTE locally. He suggested 25 cold for my 225s on 9s.
I found what seems like the in depth review, it's in the June 2013 issue. Just read it. Overall, it's a love letter to the Rivals. "After just one run, we were in love."

32 psi was the happy place on the skidpad. I am assuming that's starting pressure. They did three laps so they're not going to heat up much (I think). Says not much change in skid pad times at lower or higher pressures. And consistent performance across different tire temps.

This all makes me even more eager to get them on track. [email protected] will be the first time tracking these. I think I will start at 27 cold. It just doesn't get very hot in Monterey in September - usually.
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Old 08-13-2014, 05:28 PM   #182
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Originally Posted by Dunning Kruger Affect View Post
I dump pressure in the rain for more grip.
Wrong
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Old 08-13-2014, 05:32 PM   #183
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Originally Posted by Seefo View Post
let me clarify, I generally increase pressure in the rain
Correct


Why? Because you still need to see the same hot pressures as you see in dry. In the wet the tire runs cooler for two reasons - the ambient as well as track temps are cooler and the car isn't being pushed as hard.
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Old 08-14-2014, 01:55 AM   #184
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Originally Posted by emilio700 View Post
FWIW, industrial grade nitrogen is cheap. We bought a 302cu/ft tank several years ago. Fills 40-60 tires. Cost $26 or refills and they deliver.

edit: and on the current topic. We run very high pressures in full wet conditions.
This is why I don't understand why I have hear of people paying good money for a nitrogen fill with their tires. It's not an expensive gas.

I guess to the average person the best bet is to find somebody local who has a nitrogen tank that isn't in it to rip people off.
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Old 08-14-2014, 05:23 AM   #185
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Fist search hit for Scuba fills in CA
Diver Dan's Online Scuba Store - Air fill price list
$30 for 12 fills isn't that expensive

Kits to tickle the interest Drysuit Inflation Accessories - Dive Gear Express

Not saying that exactly these will fit your needs perfectly (adapter to your favorite tire inflator etc). But the prices ($300) will give you a hint.
Small bottles are easy to carry, dead silent and fast (compare that to any small compressor).
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Old 08-14-2014, 08:25 AM   #186
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Originally Posted by philstireservice View Post
Wrong
I was Leafy posting and was drawing upon my autocross experience.

Your reasoning makes sense!
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Old 08-15-2014, 09:24 AM   #187
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Hoosier R7/A7 in the 245/40/15 size will be out Sept/Oct. I plan to try em both and see how they compare to the R6/R80/R100 tires I have tried. I keep hearing the A7 is faster than a R80. That's hard to believe but who knows maybe it is a one lap wonder.
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Old 08-15-2014, 09:56 AM   #188
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Originally Posted by k24madness View Post
Hoosier R7/A7 in the 245/40/15 size will be out Sept/Oct. I plan to try em both and see how they compare to the R6/R80/R100 tires I have tried. I keep hearing the A7 is faster than a R80. That's hard to believe but who knows maybe it is a one lap wonder.
If the A7 is faster than the R80 then you need to try the R75A which is the A7 compound on the hoosier radial slick carcass.
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Old 08-15-2014, 10:19 AM   #189
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Originally Posted by Leafy View Post
If the A7 is faster than the R80 then you need to try the R75A which is the A7 compound on the hoosier radial slick carcass.
They don't make it anymore in the 245 size. It came out for a short while then disappeared.
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Old 08-15-2014, 10:22 AM   #190
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Originally Posted by k24madness View Post
They don't make it anymore in the 245 size. It came out for a short while then disappeared.
Only just recently did they start making them this way. Before they were supposedly crap while they were trying something different. They finally caved to auto-x suggestions and just put the A6/7 compound on the slick carcass.
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Old 08-15-2014, 10:44 AM   #191
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Originally Posted by Leafy View Post
Only just recently did they start making them this way. Before they were supposedly crap while they were trying something different. They finally caved to auto-x suggestions and just put the A6/7 compound on the slick carcass.
So is it the new "S" carcass? ie S75/S80/S100

If so I will give me a try. The R80's are great but even those are a bit dicey out of the gate. The R100's are hell on a track that is not very hot. The 75's would be great if they came on strong out of the gate and lasted 20 mins.
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Old 08-15-2014, 10:53 PM   #192
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WARNING, never use a nitrogen tank without a regulator to fill a tire. That is one sure fire way to kill yourself.

I read an article with back to back track testing the NT01 Vs the Maxxis RC1. The difference was .17 seconds. The tester felt that the Maxxis was easier to drive.

Prima Racing Blog Archive Update: Maxxis Victra RC-1 comparison vs. Nitto NT01
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Old 10-27-2014, 12:54 PM   #193
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Anyone have experience using Kumho Ecsta's? I got an offer from some guy at the track for 4 new tires for $400 and he's local so I can pick them up and save on shipping/tax etc.


Worth it, or should I just go for something more known like Toyo RRs or find some SM takeoffs?
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Old 10-27-2014, 02:47 PM   #194
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Originally Posted by dcamp2 View Post
Anyone have experience using Kumho Ecsta's? I got an offer from some guy at the track for 4 new tires for $400 and he's local so I can pick them up and save on shipping/tax etc.


Worth it, or should I just go for something more known like Toyo RRs or find some SM takeoffs?
Which ones?
Ecsta LX Platinum
Ecsta PA31
Ecsta ASX
Ecsta 4X
Ecsta SPT XRP
Ecsta SPT
Ecsta LE Sport
Ecsta XS
Ecsta V700
Ecsta V710

Farther down the list you go, the better off you'd be.
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Old 10-27-2014, 07:41 PM   #195
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Originally Posted by tpwalsh View Post
Which ones?
Ecsta LX Platinum
Ecsta PA31
Ecsta ASX
Ecsta 4X
Ecsta SPT XRP
Ecsta SPT
Ecsta LE Sport
Ecsta XS
Ecsta V700
Ecsta V710

Farther down the list you go, the better off you'd be.

Not sure - he said '60 treadware slicks'- probably either the 700 or 710.
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Old 10-28-2014, 07:12 AM   #196
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Originally Posted by dcamp2 View Post
Not sure - he said '60 treadware slicks'- probably either the 700 or 710.
No that is probably the S700 slick.

They are a reasonable tire, very hard and durable compound but around 2 seconds a lap slower than Hoosier R80s, maybe more.
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Old 02-14-2015, 12:03 PM   #197
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Has there been any data on the new bridgestone potenza re-71r? Will it be available in 15" sizes other than 205?
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Old 02-17-2015, 10:47 PM   #198
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Quote:
Originally Posted by k24madness View Post
So is it the new "S" carcass? ie S75/S80/S100

If so I will give me a try. The R80's are great but even those are a bit dicey out of the gate. The R100's are hell on a track that is not very hot. The 75's would be great if they came on strong out of the gate and lasted 20 mins.
75s are fast for a couple of laps then get greasy, great quali tire if you only want to run 2 fast laps at a time. A couple of guys ran 75s for qualifying at the Runoffs this year. Front row s 3rd row, hard for me to justify the cost.
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Old 02-17-2015, 11:04 PM   #199
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Originally Posted by Ryan_G View Post
Has there been any data on the new bridgestone potenza re-71r? Will it be available in 15" sizes other than 205?
All the research I've done has lead back to this page POTENZA which lists 205/50r15 as the biggest 15" offering.
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Old 02-17-2015, 11:36 PM   #200
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Looks like Hoosier is about to release the A7/R7 in the 245/40/15 size. How do those stack up against the old A6/R6?
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