Suspension, Brakes, Drivetrain discuss the wondrous effects of boost and your miata...
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Old 11-30-2017, 06:44 PM
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Originally Posted by DNMakinson View Post
Lots of local sources for the 15 x 6's for you. I have a pair here you could drive down for.



Is that for the extra sidewall height, more flex?
id be more than willing to take you up on that offer.

as far as power and et go, im shooting for low 12s to mid 11s, and 325 rwhp/350tq

boosted v6 swap.....
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Old 11-30-2017, 08:07 PM
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PM me.

I also spoke with MandH and John -(661) 889-5221‬ said he would support import owners with coupons. He gave me the “you have to run bias plies in the front with slicks” song.

Another interesting thing about Australia, they only require bias up front with slicks at a certain speed (which I don’t remember, but faster than I will be going).

I wish that 949 had produced a 4” instead of the 6”.
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Old 11-30-2017, 08:38 PM
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I had Bogart Racing Wheels build me a set of front skinnies that are 4” wide. I got the entry level version and were reasonable in price.

They are pictured in my signature.
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Old 11-30-2017, 08:49 PM
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Originally Posted by Erat View Post
You also can't run a sub 13 second pass without a roll bar. I've been talked to about it.
I think it is sub 13.5, an ET I hope to obtain.

I've got the roll bar, but not the harness to go with it. However 16.1 harnesses seem mighty reasonable in price.

I thought this would be simple, much less complicated than a reliable track car, but the details of not breaking the car, and me wanting to "do it right" is getting difficult. Likely I'm over-thinking and should just try with what I have and see if I can even shift well under duress.

mata2fast: And matching rear? I can't tell. Thanks.
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Old 11-30-2017, 08:59 PM
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Originally Posted by DNMakinson View Post
Slicks will be M&H 23 x 7.5, Part Number MHR-021.
I think that is the best choice on the market for us right now, and plan on trying them.
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Old 11-30-2017, 09:06 PM
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Originally Posted by miata2fast View Post
I think that is the best choice on the market for us right now, and plan on trying them.
M&H makes an 24.5x8.5 as well. I assume the 24.5s are going to work differently off the line than a 23? Is that all dependent on power or is there something more complex to consider?
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 11-30-2017, 09:41 PM
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You want just enough tire to get the job done. Too much tire will slow you down on every part of the track. Keep in mind manual shifted turbo cars don’t hit as hard off the line as nitrous, so you will not need as much tire.

Also, it is important to have the lowest gear ratio you can to get through the traps without going into overdrive gears. If you don’t plan to change from a road race final gear, go to the shorter tire.

Last edited by miata2fast; 11-30-2017 at 10:06 PM.
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Old 11-30-2017, 10:19 PM
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Awesome, thanks. It seems insane to me but all the online calcs claim the car will go 130mph in the quarter, so I'm planning on needing ~140mph worth of wheelspeed to get there. Assuming 415whp/2700lbs with driver. With my 3.63s, that is 7000rpm on 24.5s or 7500rpm on 23s. Will that 23x8.5 hook that kind of power in 2nd, or will the 24.5 do it, or will neither tire do that so I'm better off staying shorter?
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 11-30-2017, 10:38 PM
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You always want to go through the traps in your one-to-one gear right at redline from what Troy tells me.
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Old 11-30-2017, 10:40 PM
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Both will hook in 2nd it’s hard to say if you will overpower the smaller tire off the line. I haven’t tried at that power in a Miata.
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Old 11-30-2017, 11:29 PM
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Originally Posted by Savington View Post
Awesome, thanks. It seems insane to me but all the online calcs claim the car will go 130mph in the quarter, so I'm planning on needing ~140mph worth of wheelspeed to get there. Assuming 415whp/2700lbs with driver. With my 3.63s, that is 7000rpm on 24.5s or 7500rpm on 23s. Will that 23x8.5 hook that kind of power in 2nd, or will the 24.5 do it, or will neither tire do that so I'm better off staying shorter?
The bigger tire should hook in 1st.

This is a 24" mickey Thompson, launching at 5K @ 20 PSI, it dead hooks.

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Old 11-30-2017, 11:59 PM
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Holy lol
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 12-01-2017, 05:14 AM
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The soft suspension was helping that car a lot as well. I think 24.5"x9 is plenty big for anything we will ever do in a Miata. A SFWD Honda is limited to 24.5x9.5 and they are putting 1200+ whp down and running 1.4 60's (7.9 @189). Thats with the weight transfer working against them.

I had to launch at 8000 to get the 24.5 to not bog thats with 280whp K24.

with that tire and 3.636 gears and a 6spd I was going through the traps in 4th well off my 9k limit. 23" tires on 4.10 gears would work perfect for me and like posted above the smaller tire probably would help me pick up everywhere. I could launch lower and more in the torque and have less resistance. I would expect my car to run high 11's with those changes.
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Old 12-01-2017, 08:07 AM
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Re: suspension
afaik pat is on a DIY coilover setup on base suspension
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Old 12-05-2017, 04:49 PM
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Originally Posted by Savington View Post
Don't quote me, but 30 seconds of Google says that the factory Mazda spare is often a 4" wide wheel.
So, I got the NHRA rule book. Indeed, under Tires, compact spares are out, but under Wheels, they are not mentioned.

Seems that it is OK to run those rims with proper Front Runner skinnies.
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Old 12-05-2017, 05:42 PM
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You might have a hard time finding a tire that will fit the spare wheel that is rated for speed.
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Old 12-05-2017, 05:45 PM
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Originally Posted by miata2fast View Post
You might have a hard time finding a tire that will fit the spare wheel that is rated for speed.
3.5/22.0-15 (Skinnies) D.O.T. Certified

? Spare is a 15x4 wheel, aren't most frontrunners set up for 15x4s?
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 12-05-2017, 06:50 PM
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Originally Posted by Savington View Post
3.5/22.0-15 (Skinnies) D.O.T. Certified

? Spare is a 15x4 wheel, aren't most frontrunners set up for 15x4s?
I have the non DOT version from Mickey Thompson. You are right, a race tire in 14” not happening. If you are on a tight budget, a 15” skinny spare from another vehicle?
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Old 12-05-2017, 07:15 PM
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Originally Posted by miata2fast View Post
I have the non DOT version from Mickey Thompson. You are right, a race tire in 14 not happening. If you are on a tight budget, a 15 skinny spare from another vehicle?
Factory NB spares are 15"
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Originally Posted by codrus View Post
Basically I've come over to the camp of "If something is a reliability problem on the track, just ask Andrew and do what he says".
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Old 12-06-2017, 04:02 AM
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Just make sure that your skinny spare setups don't weigh more than a 185/60/14 or what not on a factory wheel.
Reduced rolling resistance is great and all but not at the expense of more weight.

Learned this decades ago when I would spent Wednesday night's at Sears Point.
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