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Drag racing setup

 
Old 11-29-2017, 03:35 PM
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Don't quote me, but 30 seconds of Google says that the factory Mazda spare is often a 4" wide wheel.
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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 11-29-2017, 03:50 PM
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Originally Posted by Dusterbd13 View Post
I had thought about using two donut spares for skinnies. However, i can't put my finger on why it may be a bad idea.
Too heavy?
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Old 11-29-2017, 04:33 PM
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Heavy and not rated for more than 65mph in the quarter.
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Old 11-29-2017, 05:55 PM
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Between this discussion, many internet searches, and some comments from Sonofthehill, I think wrinkle wall slicks, which I understand also means a driveshaft hoop, and my 195-50 Dunlops on the front. We're talking 105mph in a straight line. Slicks will be M&H 23 x 7.5, Part Number MHR-021.
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Old 11-29-2017, 06:12 PM
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So, say i have a 14x6 rear wheel. And the need for wrinkle wall slicks.

what size? Again, planning 325rwhp/325 torque.

and yes, both halfshafts and driveshaft need safety loops per nhra
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Old 11-29-2017, 08:02 PM
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Pick up a couple of 15 x 6 NB1 rims and use what I quoted above. I don't see anything available for 14's, except Mickey Thompson in a 26" diameter. 13's or 15's.

Where are you located?

Crap... and halfshafts? That might change my approach. No hop, no care.
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Old 11-29-2017, 09:03 PM
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my track never checked for a loop, but yeah you should have a driveshaft loop. I think If you just made a loop to enclose a section of the PPF it would be ok. 23x8x13 MH is what you want. the 13's will fit over stock 1.8l brakes.
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Old 11-29-2017, 09:15 PM
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The 15x6 will be have my sm7 autocross slicks.

im outside Charlotte nc
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Old 11-29-2017, 09:33 PM
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Someone needs to do a drag car with 15 x 6 6UL's in front and 15 x 12's in the rear. I'm not normally a "drag race" guy but when I do, I'd do 6UL's.......

15" wheels
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Old 11-29-2017, 10:14 PM
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This article is (slightly) relevant to this thread:
https://blog.caranddriver.com/how-mu...-ford-mustang/
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Old 11-29-2017, 10:15 PM
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Originally Posted by Dusterbd13 View Post
The 15x6 will be have my sm7 autocross slicks.

im outside Charlotte nc
That's unfortunate. You will fail.
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Old 11-29-2017, 10:17 PM
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Originally Posted by julio View Post
Someone needs to do a drag car with 15 x 6 6UL's in front and 15 x 12's in the rear. I'm not normally a "drag race" guy but when I do, I'd do 6UL's.......

15" wheels
Dead weight. 10's are enough for 1000 hp. Bp's don't make 1000 hp.
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Old 11-30-2017, 08:21 AM
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The key to success on a mildly built Miata is use the smallest slick money can buy. My best 60’ was 1.719 on a set of 20”x8”x14” on stock wheels way back in the day when I was running nitrous. At the time the car was mostly stock with an open diff. My car is a base model.

Those tires aren’t available anymore. Today I run 22x8x15.
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Old 11-30-2017, 08:23 AM
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Originally Posted by Dusterbd13 View Post
The 15x6 will be have my sm7 autocross slicks.

im outside Charlotte nc
Lots of local sources for the 15 x 6's for you. I have a pair here you could drive down for.

Originally Posted by ctdrftna View Post
23x8x13 MH is what you want. the 13's will fit over stock 1.8l brakes.
Is that for the extra sidewall height, more flex?
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Old 11-30-2017, 09:04 AM
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Yes I would run the 23’s over the 22’s personally for more side wall flex and to match a normal street tire diameter better
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Old 11-30-2017, 10:44 AM
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I don’t think the extra sidewalk is any benefit at all. If anything, for lower powered cars it may hurt. You get the benefit of less rolling resistance with less sidewall, and in my experience you can 60’ exceptionally well with a very small tire. I have very little wheel hop with the lower profile tires.

In a much higher powered car it’s another matter.
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Old 11-30-2017, 11:03 AM
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Originally Posted by miata2fast View Post
In a much higher powered car it’s another matter.
What qualifies as "much higher powered"?

Asking for a friend
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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, 12:06 PM
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Originally Posted by Savington View Post
What qualifies as "much higher powered"?

Asking for a friend
In your ‘friends’ case, 24.5x8x15 Mickey Thompson and 4.10 gear
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Old 11-30-2017, 06:25 PM
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I did some more looking. Donut TIRES are not NHRA legal. Donut rims are not discussed, that I could find. They will fit Front Runners from about anyone.

In Australia, the rims are not legal.

I have ordered the Rule Book.
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Old 11-30-2017, 06:29 PM
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You also can't run a sub 13 second pass without a roll bar. I've been talked to about it.
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