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Discussion Starter · #1 · (Edited)
I really tried to search on some info before posting this thread but was having a bit of trouble The "how to change suspension' link in the Sticky thread up top doesn't work for me so I tried to come up with a suitable topic title just to get some guidance for myself and perhaps anyone else. :)


Basically this weekend I'm fitting some new KYB shocks all round on my 91 NA. I also have a set of 15x8 25 offset mags with 205/50/15 Falken tyres. The springs are stock but I would like to lower it sometime in the near future. Now, while the shocks are out is out of the question just because I don't have time to to put the car back together after this weekend till sometime in the New Year (this car is my primary runner).


I would just like some info in its simplistic form please so I can get local prices and actually know what I am talking about when I walk into a specialist shop. Best way to lower, what sort of brand springs/measurements etc, how far can it be lowered before any sort of mods under the guards are required. Is stock camber/toe/caster fine or not etc.

(I saw a pic of Joshhungrys car and fell in love with it but it might be a tad too low for New Zealand roads).

Cheers. :)
 

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dont wanna give u too much crap, as they have already. lol.
its simple man. just go at it urself. shouldnt take u more than 2 hours tops. a few bolts up front, rears are cake. do it! save urself some money.
 

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dont wanna give u too much crap, as they have already. lol.
its simple man. just go at it urself. shouldnt take u more than 2 hours tops. a few bolts up front, rears are cake. do it! save urself some money.
except when you put gay ass racelands in. then its 6 hours with 2 people. god the stance were so much easier to put in...
 

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Discussion Starter · #9 ·
dont wanna give u too much crap, as they have already. lol.
its simple man. just go at it urself. shouldnt take u more than 2 hours tops. a few bolts up front, rears are cake. do it! save urself some money.
I know how to change the shocks (Just finished putting in the Exedy clutch + gearbox last nite) :lol: my question was really on what I should be looking for in springs and the like. When I went to a specialist the other day to pick up my mags I asked him about lowering and he said they haven't had much luck with their, [is it] 35mm springs[?] on MX5s and didn't recommend it.

Like I said, I tried to do a search within this message board but wasn't coming up with much luck except threads on pictures of slammed MX5s or how to remove the shocks. I know all that, well, not know it all but I have a Haines service manual and am happy to get my hands dirty. I just know that lowering isn't all about replacing gas shocks hence my last line in the OP 'what sort of brand springs/measurements etc, how far can it be lowered before any sort of mods under the guards are required. Is stock camber/toe/caster fine or not'.

1. go on computer
2. www.clubroadster.net
3. search function at the top bar
4. do work
5. car has new suspension and new wheels
I'd rather people not post at all than just post to give me **** that I didn't actually 'search'. I went to the sticky at the top of the page and there are 3 threads that take to to around page 98-120 with images of lowered cars and the 'How to Suspension Swap' thread link is broken and says 'No Thread specified. If you followed a valid link, please notify the administrator'..

Thanks for your time. Merry Xmas. :)
 

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First things first. With suspension, give yourself extra time to install and adjust. Nuts and bolts on an old car suck and can make a simple swap very time consuming. Second, once you have the struts and wheels on with your tires mounted, you'll see what needs to be done to make it fit how you want... whether it be a small spacer or adjusting ride height/dampening/camber for that flushy look. Start taking things apart and you'll realize Miatas are like Lego's.

The fitment thread will be your friend! Welcome to the forums too!
 

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With any spring shock combo and your wheel/tire choice, you shouldn't have issues with tire-body contact.

For example, one of my buddies chopped some cheap fleabay springs in half as a joke and rode modslam on those with no contact issues. (before anyone asks, no we didn't use the sleeves too)
 

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Discussion Starter · #12 ·
Thanks. I'll try the fitment thread.

Btw, here are my shocks. Looking around it appears people seem to buy a lot of shock/coil combos. I only bought the inserts hence my questioning.



And my mags that I picked up the same time.

 

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Pipemould, you should look for springs from manufacturers with a solid reputation. Most will have websites that will list the amount they lower, which models they fit, etc.

Because of your location, that might include Tein S-tech springs, H&R, Eibach, etc. They will ride more firmly than the OEM and they will typically lower a car between 19-52mm, depending on the manufacturer. It's a good idea to use Google image search (GIS) to see what your car would look like. For instance, try typing in "Miata, Tein S-tech" and browse through the images that show up. People like showing off their new mods, so they should be plenty of images out there for you to use for reference. Your wheels and offset might require you to roll the lips on your fenders upward to keep the tires from grabbing them. It depends on the ride height and size of the tires.

I am not certain your new shocks are suitable for lowering the car. When you add lowering springs, they are normally a higher spring rate (stiffer). OEM shocks and OEM replacements are usually manufactured to handle the OEM spring rates. These shocks can technically handle the stiffer, lower springs, but they tend to wear out faster than their heavy-duty or performance engineered cousins. Some of these performance shocks include KYB AGX, Tockico Illuminas, Koni sports, Bilstein, etc. Tockico Blues or KYB GR-2 are low end replacements that may work well if you are on a tight budget.

There are also springs offered by Miata-specific vendors who use their own proprietary rates and a second party manufacturer. These include Flying Miata and Racing Beat. There are a few Japanese vendors, too.

Depending on how low your springs lower the car, and the manufacturer you choose, you may want to cut the OEM bumpstops a little for added shock travel. Some manufacturers include bumpstops, some don't. Those that do, you want to compare the new stops to the OEM and cut them to length or shorter.

Alignments are like opinions. Everyone has one they prefer. The suspension on the Miata allows for a lot of adjustment, so it really depends on how agressive you want the handling to be and how long you like your tires to last. A neutral alignment (stock settings) is fine, but sometimes when you lower the car too much, there are settings you can't get back *quite* to stock, like camber. If the tires rub after adding the springs, you may need to run more negative camber to help with clearance as the wheels/tires travel through their arc. As I mentioned before, rolling the fenders helps with this, but it depends on the factors I mentioned previously.

Good luck!
 

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Discussion Starter · #14 ·
Thanks for that. Before I put new springs in the car will be stock height so atleast I will be able to get a rouhg idea of how low I'd like. Anything close to slamming isn't really an option once you hit the country roads.

The guy who picked up the shocks for me gave to two sets of bumpstops, one has quite a bit more 'stop' than the other (around an extra inch or so) but if I was to trim to top bit off the rest wouldn't fit too well unless I just shaved about half of the existing stop off.
 

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You replace the old stops with the new ones. They slide right off. A lot of people just cut the stop in half. It's pretty important to use them. Without them the shocks can slam into the tophats, metal to metal, and cause the shock to leak or worse.

I am guessing you have an NA Miata? The rear shock travel on the NAs is fairly short. An NA on lowering springs can tend to "bottom out" under compression in the rear. There are taller tophats available, that allow more travel, but see how it rides in teh meantime. The taller tophats are made by ISC racing, and I think Fatcat Motorsports. NOPRO made some for the NA using modified NB tophats. There is an option to use NB tophats, too, but the springs seat differently between the NA an NB.
 

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Anything close to slamming isn't really an option once you hit the country roads.
I have my BCs wound all the way down and am using the same country roads
I must say i wouldnt DD like that but its fine for weekend stuff

Just your run of the mill lowering spring will do if if you want to lower without having to certify your car

See these guys they will be able to help you with some
http://precisionwheels.co.nz/

the cars in this pic all use NZ roads


Mine is the one at the front

Hope this helps
 

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no one uses gc sleeves? they might not be the best choice for kyb's though
In New Zealand, if you make your suspension height adjustable (or add a turbo etc) you will need to certify the modifications to the vehicle.

basicly an engineer has to come out and look over the car then gives you a plate to attach to it
its quite expensive and not worth the hassle for most people
So if you were to go for a cert you may as well get a real set of coilovers
 
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