check out the website www.themclub.net. These are the guys that put on the even that I now partake in. They go down at Giant Stadium in one of many parking lots. the next one is sunday Feb 23 i'll be there again.
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scapamouche
Member
Another good resource for autox is www.scca.org then follow the links to the regional site for your area, and look for SoloII information and schedules.
cjstringer:
i believe i said what scapamouche said first
and i touched upon another concept about suspension that he didn't
i mentioned smaller tires effectively lowers your gearing and that the rotational mass is one thing in terms of having to accelerate it from a slower rotation but ALSO the suspension system responds "quicker" to bumps, irregularities, etc. on the road with lighter wheels
i believe i said what scapamouche said first
and i touched upon another concept about suspension that he didn't
i mentioned smaller tires effectively lowers your gearing and that the rotational mass is one thing in terms of having to accelerate it from a slower rotation but ALSO the suspension system responds "quicker" to bumps, irregularities, etc. on the road with lighter wheels
cjstringer
Member
Sorry Sleeper, I'll check my quotes a little better next time! 
scapamouche
Member
sleeper_ said:cjstringer:
i believe i said what scapamouche said first
and i touched upon another concept about suspension that he didn't
i mentioned smaller tires effectively lowers your gearing and that the rotational mass is one thing in terms of having to accelerate it from a slower rotation but ALSO the suspension system responds "quicker" to bumps, irregularities, etc. on the road with lighter wheels
NYAH, NYAH, NYAH!!!!!!
Bah Humbug 
quick question.
What's with the Kumho's?
I ask because I had a set a few years ago, and I thought they were the worse tires I ever put on the car. Even worse then the bridgestone they replaced. I never got any milage out of them, and the couldn't grip for s***.
I guess they got better recently
What's with the Kumho's?
I ask because I had a set a few years ago, and I thought they were the worse tires I ever put on the car. Even worse then the bridgestone they replaced. I never got any milage out of them, and the couldn't grip for s***.
I guess they got better recently
Run the smallest wheel that will fit over your brakes.
A smaller overall diameter whell tire combo will in effect give you a higher gear ratio. (The car will accelerate faster)
Smaller wheels tend weigh less then larger wheels (yes you can get light 17" or 18" rims, but they cost a grip). I'm not sure if you've ever heard of the term "unspring weight" but it reffers to weight that is not supported by your suspension. The lower your unspring weight is, the faster your suspension will react. If you boil it right down, the lower the unsprung weight the better the handling.
So small, light wheles are the way to go. Why do touring cars have huge wheels? To clear huge brakes.
Edit: I totally missed page 2 of this thread. Sorry about the repitition.
A smaller overall diameter whell tire combo will in effect give you a higher gear ratio. (The car will accelerate faster)
Smaller wheels tend weigh less then larger wheels (yes you can get light 17" or 18" rims, but they cost a grip). I'm not sure if you've ever heard of the term "unspring weight" but it reffers to weight that is not supported by your suspension. The lower your unspring weight is, the faster your suspension will react. If you boil it right down, the lower the unsprung weight the better the handling.
So small, light wheles are the way to go. Why do touring cars have huge wheels? To clear huge brakes.
Edit: I totally missed page 2 of this thread. Sorry about the repitition.
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cWhat wheels and tires I run depends on which class I am running and what the rules are for the class. Normally, I am running my Miata in the stock class so I run the stock size wheels with the Kumho V700 victoracer tires.
Right now, my daughter is running the MP3 in street tire class on a GS index. This means that she is running GS rules except that she can only run regular street tires. We have run the MP3 in FSP with 225/50-15 "R" tires on 7x15 inch wheels.
I guess my point is that you need to know the rules and what they will allow you to do.
Right now, my daughter is running the MP3 in street tire class on a GS index. This means that she is running GS rules except that she can only run regular street tires. We have run the MP3 in FSP with 225/50-15 "R" tires on 7x15 inch wheels.
I guess my point is that you need to know the rules and what they will allow you to do.
scapamouche
Member
JasonH said:
Like Jason said, the Kumhos we're talking about are the Victoracer V700s and Ecsta V(?)700 race compound tires. They are one of the two dominant r compounds used in SCCA SoloII these days. The other option is from Hoosier, and there are also tires available from companies like Toyo, Michelin, Yokohama and BFG.
I personally have very little experience with R-compound tires myself: two autox two years ago with my Celica in STR (a now defunct class.) Most of my time has been in STS where there is a street tire requirement (enforced by having a minimum treadwear rating of 140 for any tire to be legal for STS.)
I think I'll be driving the MSP in STX here in the local region since I won't be around for a full season, and I want to hang out with all of my friends in STS, which runs at the same time here.
Since some MP3 guys and MSP guys have posted in this thread ...
I just noticed that the 5Zigen Fighter wheel comes in a 17x7 +50 mm offset, so there is another option for stock class wheels that are lighter than the RacingHarts. I like the Titanium colour.
http://www.wheelspecs.com/specs/wheelmodels/509
I just noticed that the 5Zigen Fighter wheel comes in a 17x7 +50 mm offset, so there is another option for stock class wheels that are lighter than the RacingHarts. I like the Titanium colour.
http://www.wheelspecs.com/specs/wheelmodels/509
I'm planning on running in the stock Class. My problem I'm having is that the stock size for the MSP is 215-45-17 and the tire rack is not showing any Race compounds in this size. I also tried 205 -45-17 and they showed nothing. Will 225-45-17's fit or am not looking in the right place for tires?
Thanks
Thanks
dolphin, bellspeed: I noticed the same thing, but I'm thinking of going with the 205/40-17 due to the smaller diameter: more revs per mile (875?) than the 225/45-17 (835?). Also, the recommended wheel size is 17x7.5 for the 225/45, where the 205/40 is 17x7.0 (stock wheel size).
I haven't been able to find a +55 offset wheel, though. While a +50 will work and is within the 1/4 inch allowance, what does it do to the steering geometry (center of the contact patch is moved 5 mm)? A wheel spacer 5mm thick would provide the added clearance if the brakes interfere, but doesn't fix the change in geometry. Anyone tried some +50 offset wheels and noted any handling differences?
I haven't been able to find a +55 offset wheel, though. While a +50 will work and is within the 1/4 inch allowance, what does it do to the steering geometry (center of the contact patch is moved 5 mm)? A wheel spacer 5mm thick would provide the added clearance if the brakes interfere, but doesn't fix the change in geometry. Anyone tried some +50 offset wheels and noted any handling differences?
MSP Pro,
I have two sets of the stock Racing Harts for my MP3 so I can't help you with the off set question. The other thing you need to check is to make sure that the tire has sufficient load carrying capability for your car and use. With the MP3, the 205 is the correct section width and there is enough load carring ability to handle the car in autocross trim. You would not want to use them for trips with the car loaded.
I have two sets of the stock Racing Harts for my MP3 so I can't help you with the off set question. The other thing you need to check is to make sure that the tire has sufficient load carrying capability for your car and use. With the MP3, the 205 is the correct section width and there is enough load carring ability to handle the car in autocross trim. You would not want to use them for trips with the car loaded.
Lower offsets mean the wheel actually sits farther away from the brakes so you will be fine. +50 is the best you'll get. As far as I can tell it is either get Team Dynamics Pro-Race-1 wheels and have them made to a +50 offset, or get the 5Zigen fighter wheels which are already +50.
A lower offset will give you a slightly wider track, and therefore a bit more stability but it will also slightly increase the feeling of torque steer.
The Dunlop SP9000 actually have a really high load rating which will be tough to match with other tires of the same size. (only 24" o.d. ) Although it may not matter too much if you are only using them for competition. What I would be worried about I guess is overloading the sidewall of the tire if the load rating is not high enough? Does that make sense? I'm not sure ... hehe
If you are only using the tires for competition, you have a bit more flexibility with the tire size vs. wheel size. Putting 225s on a 7" wide wheel probably woudn't be great for street but you could get away with it for competition.
A lower offset will give you a slightly wider track, and therefore a bit more stability but it will also slightly increase the feeling of torque steer.
The Dunlop SP9000 actually have a really high load rating which will be tough to match with other tires of the same size. (only 24" o.d. ) Although it may not matter too much if you are only using them for competition. What I would be worried about I guess is overloading the sidewall of the tire if the load rating is not high enough? Does that make sense? I'm not sure ... hehe
If you are only using the tires for competition, you have a bit more flexibility with the tire size vs. wheel size. Putting 225s on a 7" wide wheel probably woudn't be great for street but you could get away with it for competition.
