Miata List Archive

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Mail From: mheller311 (Matt Heller)

My 1990 has over 100k miles on it now, and I doubt
anything has ever been done to the suspension. I've
recently gotten into autocrossing (wanted to for a
long time, finally actually doing it) and I'd like to
keep it in the stock class. I've driven a '90 with
the AGX's and I'm pretty sure I'll be going with
those.

My main question is what I can do for springs. The
Flyin' Miata springs are very tempting, along with
their shock mounts for proper travel. However, I'm
wondering if these are stock class legal? If not, what
other options are there? I'd like to keep the ride
height roughly the same, as this is my daily driver
and need some height for the roads I drive on.

Also, while doing all this suspension work, I wanted
to replace all the bushings. I know that polyurethane
and delrin are illegal, but is there any "harder
rubber" option? or should I just stick with whats
there?

And lastly, is there anything I'm missing? I'm
planning on new shock boots also, but I don't have too
many questions about those ;)

Other things of note: I have a hard dog extreme bar
installed, and yes, I know that the best way to
improve my times is to take a class, which I'll also
be doing in the spring. In fact, I'll be doing all
this work in the spring, just want to get a number for
how much I need to save up this winter. Also, I plan
on running Azenis on my spare set of wheels to be used
mainly when racing.

Thanks for any input
Matt

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Mail From: bigmouthjohn (John Hammer)

Matt,

In stock class all you can change are shocks: bushings, springs, air in
the tires, must all be from the factory (or OEM replacements). I'm
kidding about the air. It's referred to as the "Midas" rule: what can
you buy at Midas? Shocks, brake pads, exhaust...that's about all you
can touch.

Hammer

Matt Heller wrote:

>My 1990 has over 100k miles on it now, and I doubt
>anything has ever been done to the suspension. I've
>recently gotten into autocrossing (wanted to for a
>long time, finally actually doing it) and I'd like to
>keep it in the stock class. I've driven a '90 with
>the AGX's and I'm pretty sure I'll be going with
>those.
>
>My main question is what I can do for springs. The
>Flyin' Miata springs are very tempting, along with
>their shock mounts for proper travel. However, I'm
>wondering if these are stock class legal? If not, what
>other options are there? I'd like to keep the ride
>height roughly the same, as this is my daily driver
>and need some height for the roads I drive on.
>
> Also, while doing all this suspension work, I wanted
>to replace all the bushings. I know that polyurethane
>and delrin are illegal, but is there any "harder
>rubber" option? or should I just stick with whats
>there?
>
>And lastly, is there anything I'm missing? I'm
>planning on new shock boots also, but I don't have too
>many questions about those ;)
>
>Other things of note: I have a hard dog extreme bar
>installed, and yes, I know that the best way to
>improve my times is to take a class, which I'll also
>be doing in the spring. In fact, I'll be doing all
>this work in the spring, just want to get a number for
>how much I need to save up this winter. Also, I plan
>on running Azenis on my spare set of wheels to be used
>mainly when racing.
>
>Thanks for any input
>Matt
>
>__________________________________
>Do you Yahoo!?
>Yahoo! SiteBuilder - Free, easy-to-use web site design software
>sitebuilder.yahoo.com
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>Miata mailing list
>(email redacted)
>realbig.com/mailman/listinfo/miata
>
>
>

--
John Hammer
JohnHammer.org

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Cumulus Broadcasting
WKFR, WRKR, WKMI Kalamazoo, MI

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Mail From: keith (Keith Tanner)

My own personal philosophy on car modification and autocross? Unless you're
really serious about collecting particleboard trophies, build a car that's
fun on the street and just autocross it in whatever class it happens to end
up. It's more fun that way. But that's just my own opinion.

Stock class implies the car is very close to stock :) Nothing can be added
that will make a huge difference to performance. Our shock mounts are legal
in CSP but definitely not stock. John's already addressed this issue.

Springs are relatively cheap to buy, but they can make a huge difference to
the car. Not necessarily a good change, depending on what it is you want to
achieve. Lower springs have to be stiffer and will bring ground clearance
problems. Stiffer springs will make the car more responsive but at the
expensive of ride comfort and of grip on broken pavement.

Mazda Competition does sell rubber bushings that are puportedly 40% stiffer
than stock. No, they're not stock legal either.

Keith

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Mail From: kentmclean (Kent McLean)

Matt Heller wrote:
> Also, while doing all this suspension work, I wanted
> to replace all the bushings. I know that polyurethane
> and delrin are illegal, but is there any "harder
> rubber" option? or should I just stick with whats
> there?

With 10 years and 100K miles on the original bushings,
you may be happy with new OEM stock. Especially if
you live up north where pot holes and frost heaves can
test your mettle.

Kent
'93 C-pkg black-and-tan