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Author Topic: Modifications allowed in a class  (Read 3838 times)
ROADRAGE101
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« on: April 20, 2015, 01:52:02 PM »

I have been looking through the SCCA rules posted under the downloads section here and I cannot seem to find out what modifications can be done to my car while still keeping me in the same class.

I am in the ES class, and drive a '92 1.6L miata. I want to check on what sway bar and tire options I have. I really don't want to leave my class yet because I am still pretty slow in it, but I also want to do a bit of work over the duration of the season to make my car better while I improve my driving skills.

Can someone point me in the direction of where to find out this information please and thanks? I want to try to get an understanding of classing.
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travisb
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« Reply #1 on: April 20, 2015, 02:03:32 PM »

Here are a couple links to get you in the right direction.

SCCA Street Rules - if it doesn't specifically say you can do something, then you can't do it.
http://scca.cdn.racersites.com/prod/assets/2015-3-31%20section%2013%20street%20category%20online.pdf

Miata.net - best community for all things Miata - this is the autocross / racing section with several ES threads on just the first page
http://forum.miata.net/vb/forumdisplay.php?f=13

Hope that helps.
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Conemasher
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« Reply #2 on: April 20, 2015, 03:19:29 PM »

A simple list for street clas is as follows, in my order of importance:

  • Tires and wheels- pick up a set of Bridgestone RE71R's in a size recommended for your stock wheels or 15" if legal for your car. Do not overtire the car. If you are on 14x6 wheels, you can upsize to 15x6 for better tire sizes (you can +/- 1" in diameter, but retain stock width)
  • Swaybar - You can change out one bar from stock. Miatas usually respond best to a bigger bar in front. Miata.net link probably references the best options.
  • Alignment - good info on miata.net autocross forums.
  • Shocks - Koni single adjustables (best bang for buck)
  • Other mods - drop in air filter in stock airbox (K&N or similar), cat back exhaust



« Last Edit: April 20, 2015, 03:24:18 PM by Conemasher » Logged

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travisb
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« Reply #3 on: April 20, 2015, 04:41:07 PM »

Tires and wheels- pick up a set of Bridgestone RE71R's in a size recommended for your stock wheels or 15" if legal for your car.
If you plan to use the same tires for autox and daily driving you may want to skip the RE71R. They are a new tire this year and people are finding that they wear extremely fast. But they do seem to be one of the fastest tires.
And like he said: tires and alignment are the best start. After seat time, that is.
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whiteryder
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« Reply #4 on: April 20, 2015, 06:43:20 PM »

If you plan to use the same tires for autox and daily driving you may want to skip the RE71R. They are a new tire this year and people are finding that they wear extremely fast. But they do seem to be one of the fastest tires.

Oooo, I was thinking about RE71's someday, that's interesting to know.

I had great luck with my RE11's, they lasted a pretty long time.  And I used them for autocross and
track days as well as daily driving.
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gunny
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« Reply #5 on: April 20, 2015, 07:37:23 PM »

I got them up front on my car! they are really nice!.

Gunny
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travisb
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« Reply #6 on: April 21, 2015, 02:34:05 AM »

I've seen several threads on different car make/model forums with similar results to this after one or two weekends. The RE71R is a 200 TW tire, but appears to wear like 100.
http://www.ft86club.com/forums/showpost.php?p=2181359&postcount=187

(this is just an example, maybe only some people are wearing this fast???, i am not a tire expert Smiley )
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jamescarriv
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« Reply #7 on: April 21, 2015, 04:12:17 AM »

The re71r makes HS civics faster than SS GT3s. Smiley
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« Reply #8 on: April 21, 2015, 05:42:29 AM »

The re71r makes HS civics faster than SS GT3s. Smiley

Well shucks... here we were assuming that was all driving skill.  Silly us!

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« Reply #9 on: April 21, 2015, 07:18:55 AM »

The re71r makes HS civics faster than SS GT3s. Smiley

Hahaha ouch!
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« Reply #10 on: April 21, 2015, 08:58:02 AM »

Looks like a long enough list to make just about anyone broke for a season.
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ROADRAGE101
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« Reply #11 on: April 21, 2015, 11:25:08 AM »

SCCA Street Rules - if it doesn't specifically say you can do something, then you can't do it.
http://scca.cdn.racersites.com/prod/assets/2015-3-31%20section%2013%20street%20category%20online.pdf

Oh gotcha, I had read that list but I did not understand that (I believe section 15 of that pdf has this info) certain makes will be classed a-f street class. I thought it was like the Need For Speed game where you move from ES class to DS class when you modify the car. Now that I know that I will stay in ES class because my car is a miata, I will worry about what I can do to stay in the Street class.

A simple list for street clas is as follows, in my order of importance:

  • Tires and wheels- pick up a set of Bridgestone RE71R's in a size recommended for your stock wheels or 15" if legal for your car. Do not overtire the car. If you are on 14x6 wheels, you can upsize to 15x6 for better tire sizes (you can +/- 1" in diameter, but retain stock width)
  • Swaybar - You can change out one bar from stock. Miatas usually respond best to a bigger bar in front. Miata.net link probably references the best options.
  • Alignment - good info on miata.net autocross forums.
  • Shocks - Koni single adjustables (best bang for buck)
  • Other mods - drop in air filter in stock airbox (K&N or similar), cat back exhaust

Thanks for the list. I am going to try to learn DIY alignment techniques (handy for adjusting for track days) so that will be a good place to start. I plan to get a spare set of rims and put some dedicated autoX rubber on them, so I will look into the RE71Rs.

Looks like a long enough list to make just about anyone broke for a season.

I think sway bar will be the only other thing I will look into for this season for this very reason Tongue

Thanks all for the info, so much is cleared up now!!!
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