|
|
|
|
Thread Tools | Display Modes |
10-11-2007, 03:59 PM | #1 |
Scooby Specialist
Member#: 53247
Join Date: Jan 2004
Chapter/Region:
SCIC
Location: Orange, California
|
Hoosier R6 vs Toyo RA-1 - width/pressure differences, etc
Primary use: HPDE/Road racing
My RA-1s are done after my last track event, so I am in need of some new tires. I was using 235/40/17 Toyo RA-1s on 17x8 +48 Rota Torques. I bought them shaved and slightly used for about $65 per tire from a company that sells used race tire take-offs. One of the tires corded on my third event (~5 hours of track time). I would probably have gotten 4 events out of them if I didn't destroy the fronts at the first event due to understeer. The first two events were 100°+ days, so that may have hurt a bit, also. This time around, I was thinking of getting something with a little more grip and maybe wider. But if I went any wider, I would have to cut/roll my rear fenders. I would definitely go this route if I was to continue to track my WRX, but I plan to sell it and get a Miata towards the beginning of the year. That said, I am considering getting 225/45/17 Hoosier R6s. They will be almost full tread, with one session on them. These tires will be considered "full tread", whereas the RA-1s I had were "3/4ths tread". The Hoosiers will have similar, or slightly more, tread depth. Tread life Over the past few events, I have cleaned up my driving a lot in order to keep the front tires gripping instead of pushing. I hope to do 3 more track events this year. The weather should be cool to slightly warm during the next few months. I know the Hoosier R6s have a softer compound, but given the circumstances, do you guys think I will be able to make these tires last for 3 events? It will probably be 4-5 20-25 minute sessions per event. Overall, track time should be similar to what I did before but the weather will be cooler, and a lot less understeer. One more thing to note: My car has 347 whp, so front wheel spin when coming out of corners has been an issue. I recently installed a Whiteline anti-lift kit, which did help a lot. But my front tires do still spin on some corner exits. Width differences I believe the Hoosier R6s run about one size wide, and the RA-1s are average width. Will the 225/45 R6s be a similar width to the 235/40 RA-1s on the same 17x8 wheel? I was originally planning on getting the 245/40/17 R6s, but I think it might be a little overkill for a 17x8 since it will probably fit like a 255/35/17. Plus, I would most likely have to roll my fenders, and strut clearance may be a concern. Tire Pressure Differences For the RA-1s, I have found them to be real nice when I start them off around 34 cold, which puts them around 40-42 hot. Does anyone know what the R6's most optimal operating temperature would be? I know I will have to experiment, but a ballpark range would be nice to know ahead of time. Thanks, Brian
* Registered users of the site do not see these ads.
|
10-11-2007, 04:08 PM | #2 | |
Scooby Guru
Member#: 71634
Join Date: Sep 2004
Chapter/Region:
MAIC
Location: C-Ville, VA
Vehicle:In hibernation... |
Quote:
|
|
10-11-2007, 04:26 PM | #3 | |
Scooby Specialist
Member#: 53247
Join Date: Jan 2004
Chapter/Region:
SCIC
Location: Orange, California
|
Quote:
Thanks for the reply. And damn do those look wide. I'm not familiar with AutoX class rules, do you have anything done as far as shocks/springs? Is your ride height high enough that when you experience body roll, the fenders clear the shoulders of the tires? And do you mind telling me the size/offset of those wheels? I am on 8k/6k coilovers with about 14" F/13.5" R fender to hub ride height. |
|
10-11-2007, 04:43 PM | #4 |
*** Banned ***
Member#: 24038
Join Date: Sep 2002
Chapter/Region:
South East
Location: Godspeed Cale...
|
You start RA-1's at 34 cold road racing? holy carp...
Have you tried aiming for 34-37ish HOT temps? I think you'll like them better. Most of us start them in the upper 20's cold. Sorry I didn't help with your question at all! |
10-11-2007, 04:54 PM | #5 | |
Scooby Guru
Member#: 86356
Join Date: May 2005
Chapter/Region:
Tri-State
Vehicle:2018 Aprilia Tuono v4 1100 |
Quote:
Front swaybar and shocks are basically the only mods allowed. Stock spring rates and height. He has +55 stock wheels though, with a wide rcomp and +48s you may need to roll the rear fender slightly. |
|
10-11-2007, 05:51 PM | #6 |
Scooby Guru
Member#: 71634
Join Date: Sep 2004
Chapter/Region:
MAIC
Location: C-Ville, VA
Vehicle:In hibernation... |
Correct on all accounts -- those wheels are +55 offset 17x7" SPT wheels. I do know that Hoosier R6/A6's on a +50 offset wheel do NOT rub either.
|
10-11-2007, 06:03 PM | #7 | ||
Scooby Specialist
Member#: 53247
Join Date: Jan 2004
Chapter/Region:
SCIC
Location: Orange, California
|
Quote:
Before my first event with the Toyos, I searched to find what pressures people were running and saw this: Quote:
|
||
10-11-2007, 06:08 PM | #8 | ||
Scooby Specialist
Member#: 53247
Join Date: Jan 2004
Chapter/Region:
SCIC
Location: Orange, California
|
Quote:
Quote:
Thanks for the answers. It would probably be close, but I don't want it to end up rubbing on me at the track. I'm sure rolling the fenders would provide plenty of room, though. |
||
10-12-2007, 08:43 AM | #9 |
Hoodbridge!
Moderator Member#: 560
Join Date: Nov 1999
Chapter/Region:
MAIC
Location: Woodbridge, VA
Vehicle:2006 STi, 16 Outback Crystal Gray, Silver |
One thing to consider is that a full tread Hoosier has about the same tread depth as a shaved RA-1. Also, the Hoosier is basically a slick compared to the RA-1, with much more grip. Hoosiers run wide, so the 225/45/17 will probably be as wide as the 235 RA-1.
|
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
TOYO RA-1 vs R888 | Blue08REX | Motorsports | 6 | 04-20-2010 12:41 PM |
Auto-x tire pressure Toyo RA-1 | MrBaggio | Motorsports | 6 | 09-17-2004 04:18 PM |
Kumho Victoracers vs. Toyo RA-1? Size: 255/40-17. | Red Rocket | Tire & Wheel | 14 | 05-30-2003 05:33 PM |
Toyo RA-1 | hypov | Tri-State Area Forum | 24 | 08-07-2002 09:48 AM |
TOYO RA-1 track tires and WRX wheels for sale | vrm vrm | North West Impreza Club Forum -- NWIC | 12 | 05-30-2002 05:16 PM |