 Anyone here have experience running with Hoosier R7?, tire pressure questions. |
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| jmz |
 Dec 12 2017, 03:30 PM
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#1
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Member  Group: Members Posts: 166 Joined: 11-April 16 From: Lone Star State Member No.: 19,886 Region Association: None  |
I'm trying to get the tire pressures right on the R7s on my 914/6/gt. Running 275x35x15 and 245x40x15. I initially started at 22 shooting for 27 hot but I think they like to be run a bit lower than that.
I'm nowhere near what Hoosier recommends though. Any thoughts?  |
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| Randal |
Dec 12 2017, 04:07 PM
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#2
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
QUOTE(jmz @ Dec 12 2017, 01:30 PM)  I'm trying to get the tire pressures right on the R7s on my 914/6/gt. Running 275x35x15 and 245x40x15. I initially started at 22 shooting for 27 hot but I think they like to be run a bit lower than that. I'm nowhere near what Hoosier recommends though. Any thoughts? What are your suspension settings, i.e., camber and toe in? Also sounds like your running track? |
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| jmz |
Dec 12 2017, 08:41 PM
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#3
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Member Group: Members Posts: 166 Joined: 11-April 16 From: Lone Star State Member No.: 19,886 Region Association: None |
I don’t have alignment specs you are asking for handy. ...all I can say is bit of camber up front and pretty neutral out back. -track only.
QUOTE(Randal @ Dec 12 2017, 04:07 PM) QUOTE(jmz @ Dec 12 2017, 01:30 PM) I'm trying to get the tire pressures right on the R7s on my 914/6/gt. Running 275x35x15 and 245x40x15. I initially started at 22 shooting for 27 hot but I think they like to be run a bit lower than that. I'm nowhere near what Hoosier recommends though. Any thoughts? What are your suspension settings, i.e., camber and toe in? Also sounds like your running track? |
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| Randal |
Dec 13 2017, 12:05 PM
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#4
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Advanced Member Group: Members Posts: 4,446 Joined: 29-May 03 From: Los Altos, CA Member No.: 750 |
QUOTE(jmz @ Dec 12 2017, 06:41 PM) I don’t have alignment specs you are asking for handy. ...all I can say is bit of camber up front and pretty neutral out back. -track only. QUOTE(Randal @ Dec 12 2017, 04:07 PM) QUOTE(jmz @ Dec 12 2017, 01:30 PM) I'm trying to get the tire pressures right on the R7s on my 914/6/gt. Running 275x35x15 and 245x40x15. I initially started at 22 shooting for 27 hot but I think they like to be run a bit lower than that. I'm nowhere near what Hoosier recommends though. Any thoughts? What are your suspension settings, i.e., camber and toe in? Also sounds like your running track? My experience with light weight 914's (1650# or lighter) running autox is that you had to start very low to get any heat into tires. Like 18 psi or sometimes even lower. This was true with either radials or cross ply tires. My conclusion was that most tires were made for heaver cars, so had to compensate some way to get temperature in them. When I ran Hoosiers on the track, before my 914 was extensively modified, started at 22 psi (or close to that) and after 20-25 minutes they were 130+ degrees on a 80 degree day at Thunderhill. IMO for autox, hillclimbs and enduro events (4 minutes 60 corners) the best tire for lightweight 914's is Avon. You can match the compound to the event. |
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Posts in this topic
jmz Anyone here have experience running with Hoosier R7? Dec 12 2017, 03:30 PM
jmz I thought I'd add to the thread for anyone fol... Dec 13 2017, 09:48 AM brant your still too high of a pressure at 22
I think we... Dec 13 2017, 11:40 AM
jmz -Brant,
The car is a bit over 2100 lbs without th... Dec 13 2017, 03:26 PM brant
-Brant,
The car is a bit over 2100 lbs without t... Dec 13 2017, 03:31 PM jmz ...also, tires are somewhat open with my group. I... Dec 13 2017, 03:41 PM brant
...also, tires are somewhat open with my group. ... Dec 13 2017, 04:01 PM Heater Guy Weight of the car. Divide by 110. Minus 6 lbs.
My... Dec 13 2017, 04:28 PM brant
Weight of the car. Divide by 110. Minus 6 lbs.
M... Dec 13 2017, 04:50 PM wndsrfr do you have any TD experience? I'd love to ge... Dec 13 2017, 08:16 PM brant
do you have any TD experience? I'd love to g... Dec 14 2017, 11:52 AM wndsrfr
do you have any TD experience? I'd love to ... Dec 14 2017, 06:54 PM sixaddict I have been running them on a 3 liter six 2280 wit... Dec 13 2017, 04:38 PM jmz Yes Brant, I'm running with CVAR. I've l... Dec 13 2017, 06:23 PM brant
Yes Brant, I'm running with CVAR. I've ... Dec 14 2017, 11:50 AM Jetsetsurfshop
Yes Brant, I'm running with CVAR. I've... Dec 14 2017, 07:33 PM jmz Very Cool! yeah, Hallet is awesome, I took ... Dec 14 2017, 09:20 PM brant that is great that it will be a home race!
I h... Dec 15 2017, 02:55 PM jmz
that is great that it will be a home race!
I ... Dec 15 2017, 06:31 PM buz914 I've been shooting for 27psi hot off track, 2.... Dec 13 2017, 08:24 PM Jetsetsurfshop Are you guys running the same temps front and rear... Dec 13 2017, 09:45 PM brant
Are you guys running the same temps front and rea... Dec 14 2017, 11:53 AM Cracker It has been my experience that you can throw out t... Dec 16 2017, 09:43 PM jmz Thanks all for the data points and information. G... Dec 19 2017, 08:44 AM |
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