06 MX5 solo nationals STR setup

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06 MX5 solo nationals STR setup

Postby elloco54 » Sat Sep 27, 2014 3:50 pm

I plan to make a run at the solo nationals in STR next year. My current setup has done very well at local and a divisional solo. But I know there is more in the car. What I have now is motoeast intake & tune,complete max power exhaust,IL motor mounts and the M3 sport roll bar. On the suspension side it's H&R springs, Bilstein sport shocks, Hotchkis sways and FCM bump stops. Right now I'm running 17x8 wheels and 225/45-17 RS3's. My planned upgrades are 17x9 with 255/40, the GW chassis braces and powerflex bushings. Here is where I'm undecided, swap the bilsteins for koni's or bite the bullet for the Ohlins coilovers. I know there are alot of advantages with coilovers and from my research the Ohlins seem to be the only real choice in coilovers,but is there enough of an advantage over my current setup with the addition of adjustable Koni's to warrant the extra expense.
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Re: 06 MX5 solo nationals STR setup

Postby Brian » Sat Sep 27, 2014 9:52 pm

YES...you need coilovers. Not competitive in STR with national level drivers without good coilovers that include the ability to precisely control height and corner balance the car with your weight in the car, etc.

Skip the braces and use those funds toward the coilovers. The braces make the car feel solid and new...and though feedback to the driver is improved, and NVH is reduced, with the possible exception of the toe links the braces don't make the car faster (any improvement in speed marginal compared with the benefit of the coilovers).

Yes, 17x9 Enkei RP-F1 with 255/40/17
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Re: 06 MX5 solo nationals STR setup

Postby BrianC3343 » Sun Sep 28, 2014 4:55 pm

elloco54,

I would also suggest that you do a thorough reading of the rules. In particular rules regarding what bracing can be added or deleted and roll over protection. I am not sure exactly which roll bar you have, but it may not meet the rules for SCCA solo racing for fore and aft bracing.

Also Brian is spot on about his comment about coilovers. For a nationally competitive car a good set of coilovers is next on the list after wheels and tires.

Brian Clemons
Portland, Oregon
2006 Mazda MX5, Prepped for STR
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Re: 06 MX5 solo nationals STR setup

Postby Viggen » Mon Sep 29, 2014 12:38 pm

Would the off the shelf standard Ohlins work for him or would he need to consider a setup with different spring rates and valving?
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Re: 06 MX5 solo nationals STR setup

Postby Brian » Mon Sep 29, 2014 1:03 pm

Ryan Otis drove to 6th overall at 2012 Nationals... and set top STR time on the West course... on the off-the-shelf Ohlins.
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Re: 06 MX5 solo nationals STR setup

Postby BrianC3343 » Mon Sep 29, 2014 2:16 pm

The valving was off the shelf on Morris's car, but the spring rates were changed. Morris would have to verify, but I am almost certain springs are 9kg front, 7 kg rear.

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2006 Mazda MX5, Prepped for STR
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Re: 06 MX5 solo nationals STR setup

Postby Brian » Mon Sep 29, 2014 2:22 pm

BrianC3343 wrote:The valving was off the shelf on Morris's car, but the spring rates were changed. Morris would have to verify, but I am almost certain springs are 9kg front, 7 kg rear.

Brian C.


Good point, that is my recollection too.
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Re: 06 MX5 solo nationals STR setup

Postby elloco54 » Mon Sep 29, 2014 7:20 pm

Roll bar is not required for STR but mine is legal for track days with a the petty bar installed. So Brian can you go 9kg/7kg without a revalve.
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Re: 06 MX5 solo nationals STR setup

Postby Brian » Tue Sep 30, 2014 5:42 am

You can do those rates without a revalve, most coilvers can handle a push of 2kg in rates, but the revalve will give you better control over those rates.
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Re: 06 MX5 solo nationals STR setup

Postby morrisg » Thu Oct 02, 2014 9:50 pm

Yes, factory Ohlins valving with 9kg front Swifts and 7kg tapered Tein rear springs on the car. And Ryan coned away his fastest West course time which would have placed him 4th overall.

Morris
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Re: 06 MX5 solo nationals STR setup

Postby elloco54 » Sat Oct 11, 2014 5:03 pm

Going to order the GWR Ohlins next week,I will start the season with the stock springs and go from there. I have been reviewing the STR rules and I believe the GWR chassis braces with the exception of the center cross brace would be legal under 14.2-G-3 . The center brace would fall under 14.2-H-5 and be a no go...open to opinions. I am looking for input on the best wet weather tire,I have a set of 17X8 wheels I can mount wets
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Re: 06 MX5 solo nationals STR setup

Postby spigot52 » Sat Oct 11, 2014 5:32 pm

A lot people I've talked to in Vancouver us these: http://www.tirerack.com/tires/tires.jsp ... Contact+DW, since the R1R's are now too low a treadwear for STR.
'07 RX8/'06 MX5
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Re: 06 MX5 solo nationals STR setup

Postby Brian » Sat Oct 11, 2014 5:51 pm

Toyo is working on 200 treadwear version of R1R and we hope to see that before the new year.
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Re: 06 MX5 solo nationals STR setup

Postby elloco54 » Thu Apr 30, 2015 5:21 pm

So here's an update of my progress so far this season. Three events three first place. Off the shelf Ohlins, Hotchkis sways with front in middle hole and rear full soft. Powerflex & Whiteline bushings (real pain getting old ones out) Tomei LSD (not noisy at all) Dunlop star specs. Ride height is 12.5 front and 13.0 rear, I have -3 deg front camber and -2.7 rear 6 deg caster with 1/16 front toe out and 0 rear. I'm thinking of trying 9k front and 6k rear spring change (to keep the same split as current setup) and maybe a little less camber. Any input is more than welcome. Oh yeah I also swapped my Q for a street single, makes more noise but it's a throaty tone not at all like the tin cans kids put on their hondas. :lol:
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Re: 06 MX5 solo nationals STR setup

Postby Curves » Thu Apr 30, 2015 6:09 pm

I have the 9/6kg and it is much better than the stock 7/4 kg on the AX course - faster and more resposnive through the transitions. Not too stiff even on our loose ashphalt at Qualcomm. On the freeway I cannot notice the difference in ride comfort. It feels the same which is a testimanet to the good valving on the Ohlins.

Here is what I ordered. Note with the rear springs I have no preload. There is 1mm of free play when you jack the car up. But it is not a problem once you lower it to the floor. If you go over a drip in the street at speed you will hear a small clang.

Front Springs
http://www.good-win-racing.com/Mazda-Pe ... 90%20.html

Rear Springs
http://www.good-win-racing.com/Mazda-Pe ... WIFTS.html
http://www.good-win-racing.com/Mazda-Pe ... -0197.html (two of these)

Ride Height I am 12.75 rear and 12.5 front. 12.75 rear is the lowest I can go (two threads left visible). RB Front Bar set to middle, Eibach Rear Bar disconnected. -3.0 front camber, 1/16 toe out, -2.5 rear camber, 1/16 toe in.

I am surprised you are not oversteering with 0.5 inch rake. You should try 0.25 or 0 rake. More grip in the rear and you can power out of corners sooner.
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