STF to FSP build Thread - Page 3 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #21 of 837 (permalink) Old 08-22-2012, 10:39 PM
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Re: STF build Thread

Yeah. Less grip of streets = need for less spring.

If I were doing an STF build, I'd probably be thinking around 500-600 lbs both front and rear and I'd try to make the stock front bar work. I'd go big rear bar and see where that put me. I don't think the front to rear spring rate ratio has as much to do with balance as a lot of people make out...

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post #22 of 837 (permalink) Old 08-22-2012, 11:31 PM
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Re: STF build Thread

Mack is confused, he doesn't know what was on the car. We ran stiffer rear springs in the MS3 because it understeered like a pig compared to the FSP car. Front spring is 50lbs softer on the STX car, it's high relative to the MZ3 because the front was a lot heavier.

For STF, I start out with 550F/600R with no front bar. 225 doesn't generate that much grip.

I don't think you can make it work with the front bar, when we first started with an open diff, it was terrible... You just spend so much time waiting to get on the power.


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post #23 of 837 (permalink) Old 08-23-2012, 02:43 AM
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Re: STF build Thread

Oh. LOL there you go!


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post #24 of 837 (permalink) Old 08-23-2012, 10:35 AM
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Re: STF build Thread

noob question... Where one could buy such high rate springs?
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post #25 of 837 (permalink) Old 08-23-2012, 10:49 AM Thread Starter
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Re: STF build Thread

[quote author=3oomin link=topic=212184.msg4263180#msg4263180 date=1345728941]
noob question... Where one could buy such high rate springs?
[/quote]

Right here, just tell them what spring rate and spring length you want and they got it. These springs are 2.5" in diameter so you can't just drop these on your stock style strut. You need to get a conversion kit for your struts or get some coil-overs to use 2.5" springs.


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post #26 of 837 (permalink) Old 08-23-2012, 01:19 PM
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Re: STF build Thread

http://www.shock-shop.com/


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post #27 of 837 (permalink) Old 08-23-2012, 01:52 PM
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Re: STF build Thread

^^That's some good prices on Hypercoils. I'm thinking of getting some this off season.

Does anyone know where I could find an open top end and flat bottom end spring to replace my Mazdaspeed Acc. rear springs? <- springs on left side of pic


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post #28 of 837 (permalink) Old 08-23-2012, 02:34 PM Thread Starter
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Re: STF build Thread

[quote author=justint5387 link=topic=212184.msg4263095#msg4263095 date=1345689080]
Mack is confused, he doesn't know what was on the car. We ran stiffer rear springs in the MS3 because it understeered like a pig compared to the FSP car. Front spring is 50lbs softer on the STX car, it's high relative to the MZ3 because the front was a lot heavier.

For STF, I start out with 550F/600R with no front bar. 225 doesn't generate that much grip.

I don't think you can make it work with the front bar, when we first started with an open diff, it was terrible... You just spend so much time waiting to get on the power.
[/quote]

Justin, are you running no front bar on your car in STX now?
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post #29 of 837 (permalink) Old 08-24-2012, 12:30 AM Thread Starter
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Re: STF build Thread

I think I finally found a quality drop in lowering spring that has the spring rates I want and is also linear.

Made by a company called swift. They make springs for the MS3. They designed for performance, not just looks/drop.

They cost over $300 a set and if you read through their site you can see why.

http://www.swiftsprings.com/products-ss_spec_r.html

Rates are also published online which is rare! They offer springs for the Mazdaspeed3 (which will fit my car) that have a spring rate of 252 lb/in front and rear. Remember stock rates are 150/130 so that is a sizable increase (68% increase in spring stiffness on the front and 93% increase for the rear). Even the stock MS3 rates comparatively soft at 188/171 just to give you an idea. Drop is a bit of a guess, because the MS3 sits slightly lower than my car stock, but my car is also ~300 lbs lighter. They state the drop for the 1st Gen MS3 is 1.0" front and .6" rear.

It will be a good compromise between handling and comfort. This should still be pretty comfortable on the street and not bone jarring stiff. I don't know if I'll be able to tolerate the ride of springs that are 3-5X stiffer than oem on super stiff custom valved shocks for daily use. Sorry.
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post #30 of 837 (permalink) Old 08-24-2012, 11:39 AM
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Re: STF build Thread

I was gonna run Racing Beat Springs on new FSDs for the next season, but now that after reading this thread it seems like this setup would be too soft.

So, with these swift springs, can I just use them with FSDs? or would stiffer springs require better shocks?

I prefer doing it right the first time and not change anything down the road.
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