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Old 03-06-2013, 01:20 AM   #1
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Default Autocross SSM 92 miata upgrade help

i have a 92 miata that i race in SSM autocross i bought it last year with the turbo kit already on it. I am trying to figure out what would be the best upgrade for this season for around $1,000 (yes i know that i suck at driving still....im workin on that )
things already upgraded;
FM2 turbo kit about 240 HP
hard dog roll bar
konig 15" x 6.5" helium rims and hankook r-comp c51 205/50 r15 (almost shot)
what looks to be an old tokico hp suspension kit (blue shocks red springs, i think the springs are old and week though)
wilwood big brake kit in the front (couldn't pass up the great price last fall)

im not looking to compete nationally and there are only a few guys in my local club that are no ware near nationl level

so here is what i have narrowed down my options too (aside from driver skill)
225/45 r15 toyo Ra1 or R888's on 15" x8" 6ul's (since my old tires are almost gone and traction sucks) (275 hoosiers are to expensive for my blood)$1400 or so
3.9:1 rear gears with a torsen diff (curently 4.3 with open diff, inside wheel spins with even 1/2 throttle coming out of turns and sometimes hit rev limit in 2nd at some tracks)$1200 or so
coilovers like tein street advance 500/340 lbs springs with upper nb mounts (or other lbs spings not sure what size to get) $1100 or so

sorry for the long post wanted to answer most questions up front.

Thanks for any help

Last edited by skyfox2003; 03-06-2013 at 10:51 PM.
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Old 03-06-2013, 09:39 AM   #2
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Oh god, with an open you need a diff. I would see if you can try to swing for the OS Giken so you'll never want to upgrade the diff again (may want to play with the settings but thats "free"). Or go with a torsen.

You could also go less hard core on the tires and run the 225/50-15 BFG R1S on 8 or 9 inch wide wheels. Tires might make a bigger improvement than the diff, but you'll have more fun if you get the diff.
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Old 03-06-2013, 09:45 AM   #3
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For coilovers: A set of gently used Tein Flex with 9/6kg springs. They worked great on my car until I needed more spring rate than they could handle when I moved the car to XP. I sold mine for $850 I think.

I think you'll benefit greatly from having less power until the R-comp crack addiction hits. I was just as fast in my bone stock 99 miata as I was in the turbo 90 (it was ~207hp to the wheels on a Dyno Dynamics) on street tires. Also, if you still have a rear bar. Ditch it. I could never get the car to put power down on corner exit with it on, even after moving to R-comps.
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Old 03-06-2013, 10:53 PM   #4
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[QUOTE=Leafy;986312]Oh god, with an open you need a diff. I would see if you can try to swing for the OS Giken so you'll never want to upgrade the diff again (may want to play with the settings but thats "free"). Or go with a torsen.[QUOTE]

shouldn't i upgrade to a 1.8l rear end when going with an OS Giken?
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Old 03-06-2013, 11:42 PM   #5
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You're still on a 1.6 diff? Upgrade that now before it breaks and you HAVE to. It doesn't take drag launches to mulch one. Those will mulch driving around town with a GReddy kit.
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Old 03-07-2013, 10:56 PM   #6
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Tires..... purple crack!

A 225/45/15 A6 will net you the most time and they're under $1k!!
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Old 03-07-2013, 11:11 PM   #7
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Quote:
Originally Posted by flier129 View Post
Tires..... purple crack!

A 225/45/15 A6 will net you the most time and they're under $1k!!
Those will net him the least time, since the car will probably go about 5 feet before it eats the diff.

I don't know how your 1.6 diff has lasted OP, but don't expect it to. Diff, then suspension or tires.
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Old 03-08-2013, 11:54 PM   #8
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thanks for the advise i no the 1.6 diff is a week link and i will actively look for one. i can't believe it has lasted 62 autocross runs last year (double driver) at 240 rwhp
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Old 03-09-2013, 11:51 AM   #9
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Ah, I missed the open diff part.

I'd upgrade the diff AND get tires.
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Old 03-09-2013, 11:28 PM   #10
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xidas. 15x10 6uĺ. 275 hoosiers.


otherwise just enjoy the car...
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Old 03-10-2013, 12:15 AM   #11
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1. Grip. Save some more $$, ditch the 6.5" wheels and get as wide & light as you can afford, or fenders can handle. Hoosier A6 are a must if you want to be serious.

Coilovers & Springs, corner weight & alignment will help a LOT, but alas are not in your budget either. Do not compromise on a crappy sub $1000 set-up.

2. Traction. An OS Giken is preferred, but out of your budget. A Torsen is just fine, considering some VERY fast CSP cars still use them. Loose the rear bar, and go BIG on the front in the mean time. That will help you get the power down.
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