Track Guys: Are You Running 15/16 Wheels - LotusTalk - The Lotus Cars Community
 
LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 02-25-2013, 10:41 PM Thread Starter
Registered User
 
Sherman's Avatar
 
Join Date: Mar 2010
Location: SoCal
Posts: 142
Track Guys: Are You Running 15/16 Wheels

Hey guys I'm thinking of ditching my 16/17 wheel set up and going with a 15/16 wheel set up. Is there any performance gains to be had? I'd love to hear from guys with first hand experience. Tire choices using 16/17 wheels suck. I hate the Yokes and R888s. I would love to run on RA1s. Oh and I'd have to also ditch my AP brakes and get a smaller brake to fit in the 15s. I drive my car on the track so I'm interested to know what you track guys think. My car is an 08 S240.

I'm selling my 2008 Exige S 240 with tons of mods. Call me if you're interested. Sherman 805-558-1398
Sherman is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 02-25-2013, 11:11 PM
Registered User
 
carphoria's Avatar
 
Join Date: Jul 2010
Location: Northern California
Posts: 1,031
I'm not a track guy, just on occasion... I run the 15/16 set up, seems fine. Just make sure the e-brake cable doesn't run.

2006 Exige KoldFire270 SOLD
2009 Brunton Stalker SS SOLD

2003 Superformance S1 Chassis #6
carphoria is offline  
post #3 of 6 (permalink) Old 02-26-2013, 10:21 AM Thread Starter
Registered User
 
Sherman's Avatar
 
Join Date: Mar 2010
Location: SoCal
Posts: 142
Anyone else want to chime in? Please give me some details about how it changed the driving dynamic on the track. How does the car feel compared to the 16/17 wheels.

I'm selling my 2008 Exige S 240 with tons of mods. Call me if you're interested. Sherman 805-558-1398
Sherman is offline  
post #4 of 6 (permalink) Old 02-26-2013, 11:30 AM
Super Moderator
 
LarryB's Avatar
 
Join Date: Mar 2003
Location: NorCal
Posts: 3,924
I’ve got a set of 15/16” wheels. For the first 5-6 years it was more of my street setup (using Toyo RA-1, 205/225/50). Also track them once in a while. Compared to the LSS with stock sized Yoko 048 or even Toyo R888 what I notice most is the taller softer side-walls.

For more of a direct comparison you’d need to be able to run the same type wheels in the different sizes along with the same type of tires (off hand the R888 come to mind). Than the lighter weight of the 15/16 combo and tire sizing can come into play. If you went with a 225/50/16 in the rear, you’d change the gearing a bit. All leading to a subtle improvement to acceleration. Personally the biggest difference is the tire selection that becomes available. Currently am using Hankook Ventus Z214 C71 (205/50 and 245/45) and like them.

Last edited by LarryB; 02-26-2013 at 12:16 PM.
LarryB is offline  
post #5 of 6 (permalink) Old 02-26-2013, 03:54 PM
Registered User
 
Kermit's Avatar
 
Join Date: Feb 2009
Location: SF Bay Area -- Silicon Valley
Posts: 207
I have a set of 15/16 with R888 for track on my Elise, but stock wheels and tires for street. Since they are used differently, I can't give you direct comparison on the Elise. But the physics is against a heavier tire/rim combo with the mass farther from the hub. The larger and heavier rim/tire has a higher moment-of-inertia (flywheel effect) and is harder to change direction, slower to accelerate, etc. None of that is good.

With the slightly undersized tires, the speedometer error increases from "normal" +7% to about 10% over.

On my BMW E30 M3 race car, I once used +2 (17") and the difference was very noticeable. Slower to turn in and accelerate. I got rid of that combo right away.

On another race car, I fitted slightly oversize tires (Mich Pilot Sport Cups) on standard rims. and compared to the standard sized tires (Hoosiers) they were again heavier, slower to accelerate and turn-in. And again required speedo recalibration.

It's just physics.
Kermit is offline  
post #6 of 6 (permalink) Old 02-26-2013, 08:49 PM
Registered User
 
Elige's Avatar
 
Join Date: Jul 2005
Location: El Ayy
Posts: 1,561
FWIW I bet you get more replies in the Track and Technique forum: Track and Technique - LotusTalk - The Lotus Cars Community

05 graphite grey elige with zero mods.....sold
Elige is offline  
Sponsored Links
Advertisement
 
Reply

  LotusTalk - The Lotus Cars Community > Lotus Discussions > Lotus Exige

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the LotusTalk - The Lotus Cars Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome