Notices
GT4/Spyder Discussions about the 981 GT4/Spyder
Sponsored by:
Sponsored by: APR

RE-71Rs going on soon

Thread Tools
 
Search this Thread
 
Old 03-09-2016, 06:43 PM
  #91  
ShakeNBake
Rennlist Member
 
ShakeNBake's Avatar
 
Join Date: Mar 2009
Posts: 5,660
Received 961 Likes on 555 Posts
Default

Originally Posted by 2fnquik
I am about to do the stud conversion. Instructions say torque studs to just 30 ft lbs.. I feel like the studs are going to fly out of the uprights on track! This will not happen, right? Gulp
Red threadlock - at least that's what I've done in he past, sometimes they come with threadlock already on them.
Old 03-09-2016, 08:55 PM
  #92  
morefun
Rennlist Member
 
morefun's Avatar
 
Join Date: Jul 2002
Location: FL
Posts: 534
Received 17 Likes on 7 Posts
Default

Originally Posted by 2fnquik
I am about to do the stud conversion. Instructions say torque studs to just 30 ft lbs.. I feel like the studs are going to fly out of the uprights on track! This will not happen, right? Gulp
When the wheel nuts are torqued properly the studs aren't going anywhere.

+1 Use red locktite when installing.
Old 03-10-2016, 10:58 AM
  #93  
2fnquik
Instructor
 
2fnquik's Avatar
 
Join Date: Aug 2015
Location: Westwood, MA
Posts: 209
Received 12 Likes on 7 Posts
Default

Great, thank you! Sorry back to original topic..
Old 03-27-2016, 05:33 PM
  #94  
jbrennen
Track Day
 
jbrennen's Avatar
 
Join Date: Jun 2003
Location: Pittsburgh, PA
Posts: 24
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by jbrennen
FWIW, on the pressures with RE-71R, I'm running hot pressures around 32 psi for autocross (on a Cayman GTS with stock X73 suspension). I've found that 36 psi is already far above optimal. Your results may vary.
Updating this after yesterday's PCA-SDR event...

For this event, I experimented with even lower tire pressures than in the past, and I believe I've zeroed in further on the appropriate RE-71R pressures -- at least for my car.

Car is a Cayman GTS with X73 suspension and maxed out front camber. Tires are 245/35R19 front and 275/35R19 rear.

I started the set of four timed runs with 28 PSI front and 26 PSI rear. The first run, the rear tires were noticeably lacking in grip. Since I've never had a problem with grip on cold RE-71Rs in the past, I'm convinced that 26 PSI was just too low. The format of our timed runs doesn't permit a whole lot of time to go drive over to the compressor and add air, so I just hoped that as the pressures naturally came up due to the heat in the rubber, the grip would return. I was not disappointed.

By the final timed run, all four tires were at 30 PSI. The car was amazing, and I knocked almost a full second off my best time from the earlier practice runs. I ended up with the third overall top time of day, and the second best indexed time. The top time of the day was a 991 GT3 on Hoosier R7s, and he only beat me by 0.87 seconds.

So I think I'm now aiming for 30 PSI all around with hot tires.

Your mileage may vary. And thank you, Bridgestone, for these wonderful tires!
Old 03-27-2016, 11:07 PM
  #95  
usctrojanGT3
Rennlist Member
Thread Starter
 
usctrojanGT3's Avatar
 
Join Date: Feb 2013
Posts: 16,798
Received 4,111 Likes on 2,354 Posts
Default

Originally Posted by jbrennen
Updating this after yesterday's PCA-SDR event...

For this event, I experimented with even lower tire pressures than in the past, and I believe I've zeroed in further on the appropriate RE-71R pressures -- at least for my car.

Car is a Cayman GTS with X73 suspension and maxed out front camber. Tires are 245/35R19 front and 275/35R19 rear.

I started the set of four timed runs with 28 PSI front and 26 PSI rear. The first run, the rear tires were noticeably lacking in grip. Since I've never had a problem with grip on cold RE-71Rs in the past, I'm convinced that 26 PSI was just too low. The format of our timed runs doesn't permit a whole lot of time to go drive over to the compressor and add air, so I just hoped that as the pressures naturally came up due to the heat in the rubber, the grip would return. I was not disappointed.

By the final timed run, all four tires were at 30 PSI. The car was amazing, and I knocked almost a full second off my best time from the earlier practice runs. I ended up with the third overall top time of day, and the second best indexed time. The top time of the day was a 991 GT3 on Hoosier R7s, and he only beat me by 0.87 seconds.

So I think I'm now aiming for 30 PSI all around with hot tires.

Your mileage may vary. And thank you, Bridgestone, for these wonderful tires!
Oh wait, so you were running your best times with the RE-71Rs at 30psi hot? Interesting...I did notice that the tires got greasy when they were above 35psi from a 25-30 minute session. I was aiming at 33-34psi hot but I'll try 31-32psi next time.
Old 03-28-2016, 04:21 AM
  #96  
brel
Advanced
 
brel's Avatar
 
Join Date: Feb 2003
Location: San Francisco Bay Area
Posts: 71
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by usctrojanGT3
Oh wait, so you were running your best times with the RE-71Rs at 30psi hot? Interesting...I did notice that the tires got greasy when they were above 35psi from a 25-30 minute session. I was aiming at 33-34psi hot but I'll try 31-32psi next time.
In my experience, RE-71R's worked the best in 28-32psi range. On my 986, for autocross, I used to run 28F/30R on asphalt and 29F/32R on concrete.
Old 03-28-2016, 12:54 PM
  #97  
Eric5280
Rennlist Member
 
Eric5280's Avatar
 
Join Date: Feb 2015
Posts: 637
Received 190 Likes on 93 Posts
Default

Anyone have experience with these? Total crap? http://www.tirerack.com/wheels/Wheel...tandard+Brakes
Old 03-28-2016, 01:01 PM
  #98  
ExMB
Rennlist Member
 
ExMB's Avatar
 
Join Date: Oct 2008
Posts: 8,536
Received 1,381 Likes on 840 Posts
Default

Originally Posted by Eric5280
Anyone have experience with these? Total crap? http://www.tirerack.com/wheels/Wheel...tandard+Brakes
Link doesn't work
Old 03-28-2016, 01:22 PM
  #99  
Eric5280
Rennlist Member
 
Eric5280's Avatar
 
Join Date: Feb 2015
Posts: 637
Received 190 Likes on 93 Posts
Default

Originally Posted by ExMB
Link doesn't work
Can't get the link to work properly on RL for some reason.

Starke BC under GT4 on Tire Rack


FRONT
Size: 19x8.5 ET 52
(-1 Diameter)
Qty:Per Wheel:2
$269.00/each
Availability: In Stock

REAR
Size: 19x11 ET 42
(-1 Diameter)
Qty:Per Wheel:2
$289.00/each
Availability: In Stock
Old 03-28-2016, 01:24 PM
  #100  
jbrennen
Track Day
 
jbrennen's Avatar
 
Join Date: Jun 2003
Location: Pittsburgh, PA
Posts: 24
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Eric5280
Anyone have experience with these? Total crap?
I used Starke wheels last year for autocross with my Cayman GTS -- but a different design than these (I used FC, these are BC).

They weren't crap, but I only used them for I think 6 autocross events before I replaced them with some older Porsche takeoff wheels.

I only got them because I was in a hurry to get an RE-71R fitment for my car and needed wheels quickly. They did the job, and got me through the season.
Old 03-28-2016, 01:28 PM
  #101  
Eric5280
Rennlist Member
 
Eric5280's Avatar
 
Join Date: Feb 2015
Posts: 637
Received 190 Likes on 93 Posts
Default

Originally Posted by jbrennen
I used Starke wheels last year for autocross with my Cayman GTS -- but a different design than these (I used FC, these are BC).

They weren't crap, but I only used them for I think 6 autocross events before I replaced them with some older Porsche takeoff wheels.

I only got them because I was in a hurry to get an RE-71R fitment for my car and needed wheels quickly. They did the job, and got me through the season.
Thanks for the feedback. Curious if they need spacers. Otherwise the price is great and they weight seems about on par.
Old 03-28-2016, 01:35 PM
  #102  
ExMB
Rennlist Member
 
ExMB's Avatar
 
Join Date: Oct 2008
Posts: 8,536
Received 1,381 Likes on 840 Posts
Default

Originally Posted by Eric5280
Thanks for the feedback. Curious if they need spacers. Otherwise the price is great and they weight seems about on par.
The wheels are already pushed out, 8mm R & 9mm F. Rubbing could be a concern under compression on some tracks. Haven't driven HPR enough to remember any particular turns that'll compress beyond "normal".
Old 03-28-2016, 01:37 PM
  #103  
jbrennen
Track Day
 
jbrennen's Avatar
 
Join Date: Jun 2003
Location: Pittsburgh, PA
Posts: 24
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Eric5280
Thanks for the feedback. Curious if they need spacers. Otherwise the price is great and they weight seems about on par.
I didn't need spacers with them, but different size, different fitment. In general, I think that if Tire Rack shows a fitment for a particular car, it's usually a verified no-spacer fitment.
Old 03-28-2016, 01:38 PM
  #104  
Eric5280
Rennlist Member
 
Eric5280's Avatar
 
Join Date: Feb 2015
Posts: 637
Received 190 Likes on 93 Posts
Default

Originally Posted by ExMB
The wheels are already pushed out, 8mm R & 9mm F. Rubbing could be a concern under compression on some tracks. Haven't driven HPR enough to remember any particular turns that'll compress beyond "normal".
Thanks! Will keep looking for another "cheap" track wheel with better offset.
Old 03-28-2016, 01:38 PM
  #105  
Eric5280
Rennlist Member
 
Eric5280's Avatar
 
Join Date: Feb 2015
Posts: 637
Received 190 Likes on 93 Posts
Default

Originally Posted by jbrennen
I didn't need spacers with them, but different size, different fitment. In general, I think that if Tire Rack shows a fitment for a particular car, it's usually a verified no-spacer fitment.
I'll ask them and see.


Quick Reply: RE-71Rs going on soon



All times are GMT -3. The time now is 07:52 PM.