Went to the track! - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-27-2009, 04:19 PM   #1
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Default Went to the track!

Long time no talk. Been busy lately but i got out to the track, not autocross the 1/4 mile lol. Did 14.3sec at 102mph. Personally i was aiming for 12sec but i had a few problems. My boost controller wasn't working so it was over boosting so we took my vaccum line and ran the boost off the wastegate i think i was running 12lbs on my last 3 runs. So i am returning to the dyno this week to get it retuned so i can run 20lbs of boost. Second problem could hook at all, wheelspin everywhere or i dropped the clutch to fast and got shitty lauches with horrible reaction time .639seconds lol. Be easy on me first time at the track. And a couple runs i missed second gear or thrid, its kind of hard shifting at 8000rpm with 12lbs of boost. But hopefully i can get it down pat next time im returning in 2 weeks. Anyone know any good drag tires. I was thinking of buying some 15" steelies and throwing on drag tires i can get rims for 25$ ea but the tires are like 180$ a piece...and if theres anyone in the ontario region come join next week we go to cayuga. any suggestions would help me out for quicker times!
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Old 09-27-2009, 04:26 PM   #2
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You can't launch for ****.

What's your 60 ft look like?

For comparison, I used to run a 13.8 @102 with my old Greddy setup at just over 200 hp and on "Beijing Tyre Factory" all season tires (came with the car. LONG gone.)
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Old 09-27-2009, 05:11 PM   #3
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If you are going with 15" wheel, there is a 22" tall Mickey Thompson Slick that I am currently using. In my experience, using slicks will eliminate the tire hop that radials produce. I have used the Nitto drag radials before, and have had good luck with them. They will fit on a stock miata 14" and I have produced good 60' times with those, however I still get wheel hop. Wheel hop is a good way to break axles, rear ends, and transmissions.

Do not go with a tall tire unless you plan on lowering your differential gear ratio substantially
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Old 09-28-2009, 08:54 AM   #4
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Traction is another way to break things. Has anyone found the limits of the stock drivetrain on slicks?

My vote is for BFG gforce dr's.
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Old 09-28-2009, 09:08 AM   #5
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Quote:
Originally Posted by ARTech View Post
Traction is another way to break things. Has anyone found the limits of the stock drivetrain on slicks?

My vote is for BFG gforce dr's.
I have gone 1.71 60' times on the stock drivetrain. If I had problems with getting to much bite, I raise the air preasure some. It allows for some spin, and in cars that are lacking power, will keep it from bogging to bad.

I have heard that some drag radials act more like a slick in the sidewall. I have never tried them however.
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Old 09-28-2009, 11:39 AM   #6
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That's pretty impressive...really ******* impressive actually...but it sounds like your powerband is way up there. You're probably launching at not much more than 100lb ft. A turbo miata with line lock/step limiter will launch at 2-3x the axle snapping torque. You can run more pressure, but then why bother with slicks.

Yeah, they'll flex a bit, about as much as a radial can. No wrinkling like a slick though.
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Old 09-28-2009, 12:07 PM   #7
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Quote:
Originally Posted by ARTech View Post
That's pretty impressive...really ******* impressive actually...but it sounds like your powerband is way up there. You're probably launching at not much more than 100lb ft. A turbo miata with line lock/step limiter will launch at 2-3x the axle snapping torque. You can run more pressure, but then why bother with slicks.

Yeah, they'll flex a bit, about as much as a radial can. No wrinkling like a slick though.
I was running nitrous at the time, which has no lag at launch. I was launching at redline on the spray.

My car is currently on the motor, and the best has been in the mid to high 1.8s.

I have learned one very important trick when drag racing a miata. As I began to lighten the car, the car got taller and taller. This put a lot of angle in the rear axle. It got to the point where I would break an axle on the first pass. I broke a few axles before figuring it out.

When the car had nitrous and was a lot faster and heavier, I never broke an axle. I need to put springs in the car to correct the problem.
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Old 09-28-2009, 12:39 PM   #8
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Well, if that won't break parts then I'm safe. Thanks! A redline dump on with nitrous/slicks must be pretty violent, yes?

Spill the beans. What's the secret to low 60' in a miata? What HP do you think you had on spray?
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Old 09-28-2009, 12:53 PM   #9
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Quote:
Originally Posted by miata2fast View Post
I have learned one very important trick when drag racing a miata. As I began to lighten the car, the car got taller and taller. This put a lot of angle in the rear axle. It got to the point where I would break an axle on the first pass. I broke a few axles before figuring it out.

When the car had nitrous and was a lot faster and heavier, I never broke an axle. I need to put springs in the car to correct the problem.
Could you start a new thread just to discuss this?
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Old 09-28-2009, 02:25 PM   #10
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60ft time was 2.2sec
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Old 09-28-2009, 02:27 PM   #11
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And if anyone has facebook heres a video of some donuts

Bubba Stranges - St. Catharines / Niagara, ON | Facebook

and heres one of me and my buddys twin turbo supra

Bubba Stranges - St. Catharines / Niagara, ON | Facebook
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Old 09-29-2009, 08:16 AM   #12
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Quote:
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Could you start a new thread just to discuss this?
I will. Let me gather my notes, and will reveal a few tricks.
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