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Drag racing setup

 
Old 12-06-2017, 06:43 AM
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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?
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?
Originally Posted by Savington View Post
Factory NB spares are 15"
i think its time I invest in a good pair of reading glasses. Ha! My car came with a 14 spare,

Originally Posted by SchmoozerJoe View Post
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.
The skinny race tire offerings are super light. The spare wheel would have to be awful heavy to make a skinny tire and spare combo heavier than a factory 14 wheel and tire.

Who can can weigh a 15 spare and report back?
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Old 12-06-2017, 07:41 AM
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Originally Posted by miata2fast View Post
Who can can weigh a 15 spare and report back?
Let me see if the spare is still in the tire well of my nb2. I might be able to weigh it if so.
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Old 12-06-2017, 08:18 AM
  #63  
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Both of my spares, both from nb1s, are stamped 14 on the tire.

at this point, im not sure if they are na or nb spares....
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Old 12-06-2017, 10:06 AM
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That's interesting. My comments were based on my perception that NB1 compact spares were 15's, same as Andrew.

However, I just looked at mine and the indication is that it is 14 x 4.

this NB2 is 15x4

Last edited by DNMakinson; 12-06-2017 at 10:41 AM. Reason: Added ebay info
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Old 12-06-2017, 12:34 PM
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My NB2 spare is a 15. Could be dependent on whether the car had sport brakes or not, so all 03+ spares should be 15x4s, but some 01-02s might not be
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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, 12:42 PM
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Originally Posted by Savington View Post
My NB2 spare is a 15. Could be dependent on whether the car had sport brakes or not, so all 03+ spares should be 15x4s, but some 01-02s might not be
That's what I'm thinking. Sport brakes.
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Old 12-10-2017, 09:41 AM
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Front Skinnies: If I end up ponying up the $$ for biased ply skinnies:

How much would it matter between the M&H 3.6/24-15 vs 3.5/22-15?

Pros and cons, assuming no special suspension tuning.
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Old 12-10-2017, 09:54 AM
  #68  
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Go with the 22s, lighter and fit better
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Old 12-10-2017, 10:06 AM
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Originally Posted by ctdrftna View Post
Go with the 22s, lighter and fit better
This!

Its plenty safe, looks right, and faster.
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Old 12-10-2017, 10:17 AM
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That’s what I thought. ebay has a set of used Bogarts with the 24’s.
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Old 12-10-2017, 05:29 PM
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Im thinking these 24.5" tall on a 15x8 6ul for my rears.

I think it will be a close fit. Don't wrinkle walls "grow" by the end of the quarter mile? It says tire diameter range: 24-24.99 inches

Drag racing setup-screenshot_20171210-171738.png
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Old 12-10-2017, 08:34 PM
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That's a little tall, to my understanding.
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Old 12-10-2017, 09:12 PM
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Well crap. If I went with a 23" tall then I think I'd want 13's to get some more sidewall
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Old 12-10-2017, 09:13 PM
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Originally Posted by LownSlow616 View Post
Im thinking these 24.5" tall on a 15x8 6ul for my rears.

I think it will be a close fit. Don't wrinkle walls "grow" by the end of the quarter mile? It says tire diameter range: 24-24.99 inches

Attachment 218872
You can try them, but unless you are making serious power, you will go faster with less tire. A 24.5 will fit though.

Mickey Thompsons dont grow much. Some tires are built to grow as you get down the track. These days, most drag racers try to keep tire growth to a minimum.
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Old 12-10-2017, 09:39 PM
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You say you are expecting 325/325tq on a boosted v6. You might pull off the larger tire with the right diff ratio, depending upon launch technique and torque at launch versus when the boost comes on. Sounds like unchartered territory and trial runs to figure it out.
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Old 12-10-2017, 10:06 PM
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Originally Posted by miata2fast View Post
You can try them, but unless you are making serious power, you will go faster with less tire. A 24.5 will fit though.
Estimated power level is around 400whp. Not much torque tho as full boost doesnt hit til 4500rpm.

Im thinking 5 speed + 4.3 with at 24.5" tire puts me at 122mph on the limiter in 4th which should be good for an 11 sec pass.
Compared to a 23" tire 4th gear is only good for 115mph and I'd have to shift to 5th

Edit: assuming the drivetrain stays together after launch*
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Old 12-11-2017, 09:08 AM
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You have a short gear and good power so you will need the tall tire
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Old 12-11-2017, 02:53 PM
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So, I may have jumped ahead of myself. Orders some wheels and tires. Racing slicks. Now I look at Atlanta Dragway (nearest to me) and I'm not sure there is a class that I can race in. They have also reduced their Test and Tune days.

The best class would have been TrueStreet, but for that, must be DOT tires. I haven't found any cheater slicks small enough.

Need a track that is friendly to "imports", I guess.
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Old 12-11-2017, 05:09 PM
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Most tracks do test and tune one or two days a week.

If you are just starting to try drag racing, you will be better off with biased ply slicks. DOT tires are a bit less forgiving and require more time to get the setup all working properly. I really think you will be happy with the tires you originally picked out. Dont over think it.
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Old 12-12-2017, 11:31 AM
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Originally Posted by ctdrftna View Post
Yes I would run the 23s over the 22s personally for more side wall flex and to match a normal street tire diameter better
I also note, as I continue to overthink, that M&H has Street and Strip Tires in 13 that are DOT wrinkle wall. Not quite as soft a compound, but likely fine at my power level.

Would allow me to test and tune, and also run TrueStreet in same set-up.
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