Home  |  Forums  |  914 Info  |  Blogs
 
914World.com - The fastest growing online 914 community!
 
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG. This site is not affiliated with Porsche in any way.
Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners.
 

Welcome Guest ( Log In | Register )

 
 Reply to this topicStart new topic
> tire pressure for Kumho V710's
GaroldShaffer
post Sep 8 2005, 01:29 PM
Post #1


You bought another 914?
*****

Group: Benefactors
Posts: 7,623
Joined: 27-June 03
From: Portage, IN
Member No.: 865
Region Association: None
OK, the car is off getting the corner balance, neg camber, alignment thing done. I have the Kumho V710's mounted on the keizer rims, so what tire pressure to start with for AXing. With my Falkens I ran 38 psi, is that a good starting point or should I start lower? Higher? (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)
User is online!Profile CardPM
Go to the top of the page
+Quote Post
VegasRacer
post Sep 8 2005, 02:13 PM
Post #2


ELVIRA
*****

Group: Benefactors
Posts: 8,512
Joined: 27-March 03
From: Between Scylla and Charybdis
Member No.: 481
Region Association: None
Don't know about the V710's. My Victoracers did best at 31.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Sep 8 2005, 07:28 PM
Post #3


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
wow! 38 psi ? were they Azinis? RT 215 or new RT 615?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Trekkor
post Sep 8 2005, 07:58 PM
Post #4


I do things...
*****

Group: Members
Posts: 7,809
Joined: 2-December 03
From: Napa, Ca
Member No.: 1,413
Region Association: Northern California
I ran my Falken's up to 39psi front and 41psi rear. ( 215's )

I am very eager to hear the pressure recommendations for the V710's too, as mine are getting installed tomorrow. (IMG:http://www.914world.com/bbs2/html/emoticons/boldblue.gif)

I'm sure they run at differant pressures for a/x and BIG track, right?


KT
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GaroldShaffer
post Sep 8 2005, 08:36 PM
Post #5


You bought another 914?
*****

Group: Benefactors
Posts: 7,623
Joined: 27-June 03
From: Portage, IN
Member No.: 865
Region Association: None
QUOTE (sean_v8_914 @ Sep 8 2005, 05:28 PM)
wow! 38 psi ? were they Azinis? RT 215 or new RT 615?

They are the RT 215.

Trekkor,

They guy at the Tire rack that installed mine said that most AXers were running at 36 - 38 PSI with the 710's (IMG:http://www.914world.com/bbs2/html/emoticons/confused24.gif)

Seemed high to me for such sticky tires but then again what the heck do I know.
User is online!Profile CardPM
Go to the top of the page
+Quote Post
Aaron Cox
post Sep 8 2005, 09:02 PM
Post #6


Professional Lawn Dart
***************

Group: Retired Admin
Posts: 24,541
Joined: 1-February 03
From: OC
Member No.: 219
Region Association: Southern California
QUOTE (sean_v8_914 @ Sep 8 2005, 06:28 PM)
wow! 38 psi ? were they Azinis? RT 215 or new RT 615?

i was running 39 f/r with 215's
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
J P Stein
post Sep 8 2005, 09:39 PM
Post #7


Irrelevant old fart
*****

Group: Members
Posts: 8,797
Joined: 30-December 02
From: Vancouver, WA
Member No.: 45
Region Association: None
I used to run 26 in my Vracers.
I'd start at 30 & fool around with the pressures.
I'll talk to my Miata buddies & see what they run.
Most AXers don't have 2000lb cars.
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GaroldShaffer
post Sep 8 2005, 09:50 PM
Post #8


You bought another 914?
*****

Group: Benefactors
Posts: 7,623
Joined: 27-June 03
From: Portage, IN
Member No.: 865
Region Association: None
(IMG:http://www.914world.com/bbs2/html/emoticons/beer.gif) Thanks JP
User is online!Profile CardPM
Go to the top of the page
+Quote Post
sean_v8_914
post Sep 8 2005, 10:45 PM
Post #9


Chingon 601
****

Group: Members
Posts: 4,011
Joined: 1-February 05
From: San Diego
Member No.: 3,541
I was surprised because I know 4-5 guys in PCA-SDR that start at 25 psi cold w/ RT 215 and now the RT 615. it works out to about 30 hot on short AX courses. about 32 at the DE after 20-30 min running

is that 39 hot or cold?
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Trekkor
post Sep 8 2005, 11:15 PM
Post #10


I do things...
*****

Group: Members
Posts: 7,809
Joined: 2-December 03
From: Napa, Ca
Member No.: 1,413
Region Association: Northern California
QUOTE
is that 39 hot or cold?


For a/x, set cold then let air out after each run to bring it back down to your #'s.

FYI- Hoosier's increase by 3 psi per run (IMG:http://www.914world.com/bbs2/html/emoticons/ohmy.gif)

KT
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Sep 9 2005, 12:43 AM
Post #11


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
Well I cannot find the thread about Kumho, but it said to set the pressure so the tire just rolled over to the "V" molded into the sidewall.

This would suggest that the pressure should be different for AX and TT as the load on the tires will also depend on speed.

The other way is to measure the tire temperature, but that has to be done in about 60 seconds after a last full speed run. Hard to do with out a "crew".

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
ge9146
post Sep 9 2005, 10:11 AM
Post #12


Newbie
*

Group: Members
Posts: 47
Joined: 5-March 05
From: Western Michigan
Member No.: 3,716
Region Association: Upper MidWest
Garold,

I ran 28 in front and 34 in the rear (cold) on Victoracers on my 6. They seemed to build up by just a few psi depending on the length of the run. I tried to look at the rollover and adjust for that. I will admit that I am still getting used to my car. I am not sure how the 710s would be different though. Have fun with your new set up. There is a 2 day event at the Tire Rack on Sept 17 and 18th if you are interested.

Ed Scott
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GaroldShaffer
post Sep 9 2005, 10:35 AM
Post #13


You bought another 914?
*****

Group: Benefactors
Posts: 7,623
Joined: 27-June 03
From: Portage, IN
Member No.: 865
Region Association: None
Thanks Ed,

Can't make the 17th ( 3 1/2 yr son has his first soccer game (IMG:http://www.914world.com/bbs2/html/emoticons/wub.gif) ) and the 18th is our local SCCA solo (aka AX)
User is online!Profile CardPM
Go to the top of the page
+Quote Post
slow911
post Sep 14 2005, 04:16 PM
Post #14


Newbie
*

Group: Members
Posts: 13
Joined: 19-April 05
From: Chicago
Member No.: 3,948
Ed- I'll be there on the 17th and Garold I'll see you on the 18th......damn this season went by toooo fast....and I'm still slow....but I'm picking up a set of Hoosiers tomorrow and hopefully butr not likely will have them on by this weekend.

Brian (IMG:http://www.914world.com/bbs2/html/emoticons/boldblue.gif)
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Trekkor
post Sep 25 2005, 11:59 PM
Post #15


I do things...
*****

Group: Members
Posts: 7,809
Joined: 2-December 03
From: Napa, Ca
Member No.: 1,413
Region Association: Northern California
Ran the 710's at the a/x to a second place finish.

started on 27 psi front and 28 psi rear.

went to 30 front and 32 rear and shaved off a tenth in a "fun run".

Temps were 132° rear and 115° front. very similar to my heat cycle last week.

Also, the high temp was 165° rear on the track on Friday.

I'll try the pressures at the higher 30/32 next week and experiment at 34/36 and see what that does.


KT
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Trekkor
post Sep 26 2005, 12:02 AM
Post #16


I do things...
*****

Group: Members
Posts: 7,809
Joined: 2-December 03
From: Napa, Ca
Member No.: 1,413
Region Association: Northern California
I'll be curious to here how KenH liked his new 710's over the weekend at the DE/TT.


KT
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
KenH
post Sep 26 2005, 05:05 PM
Post #17


Senior Member
***

Group: Members
Posts: 680
Joined: 16-January 03
From: Gilroy, CA
Member No.: 156
OK here's the story.

Thunderhill 2.?? mile track.

Air Temp about 85.

Started the V710s at 36 pounds COLD.

Ran 20 minute laps reducing the pressure by 2# until the tires got "slippery". (this was very noticable)

Raised the pressure back up by 2# and they stuck like glue.

With the tires cold this pressure turned out to be 28#.

Did not measure HOT temperature.

Ken
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Trekkor
post Sep 26 2005, 08:45 PM
Post #18


I do things...
*****

Group: Members
Posts: 7,809
Joined: 2-December 03
From: Napa, Ca
Member No.: 1,413
Region Association: Northern California
thanks, Ken. Nice to see you on Friday evening.

KT
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
Trekkor
post Oct 3 2005, 12:11 AM
Post #19


I do things...
*****

Group: Members
Posts: 7,809
Joined: 2-December 03
From: Napa, Ca
Member No.: 1,413
Region Association: Northern California
These tires work!

30 fr 32 r. for a/x.

KT
User is offlineProfile CardPM
Go to the top of the page
+Quote Post
GaroldShaffer
post Oct 3 2005, 07:53 AM
Post #20


You bought another 914?
*****

Group: Benefactors
Posts: 7,623
Joined: 27-June 03
From: Portage, IN
Member No.: 865
Region Association: None
My next AX is Oct 16th I will try that pressure and see what happens. I ran the last one at 34 Front & rear, not bad but it was raining so a little slippery, that and I really need to get more neg camber (IMG:http://www.914world.com/bbs2/html/emoticons/rolleyes.gif)
User is online!Profile CardPM
Go to the top of the page
+Quote Post
« Next Oldest · 914World Garage · Next Newest »
 

Reply to this topicStart new topic
1 User(s) are reading this topic (1 Guests and 0 Anonymous Users)
0 Members:

 

Display Mode: Standard · Switch to: Linear+ · Switch to: Outline

Track this topic · Email this topic · Print this topic · Subscribe to this forum

- Lo-Fi Version Time is now: 25th May 2024 - 11:02 PM
Invision Power Board v9.1.4 © 2024  IPS, Inc.
All rights reserved 914World.com © since 2002
914World.com is the fastest growing online 914 community!
We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ...