1/4 mile (12.98 @ 106 w/10psi) - Miata Turbo Forum - Boost cars, acquire cats.

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Old 06-17-2008, 08:59 PM   #1
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Default 1/4 mile (12.98 @ 106 w/10psi)

Excuses first:

-poor driving
-warm weather (92F, 55%RH)
-5 year old BFG drag stones
-only 10psi for some odd reason
-2490lbs total

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60' 1.915
1/8 [email protected]
1/4 [email protected]

Some minor line lock action:

Last edited by dvcn; 06-17-2008 at 09:54 PM. Reason: missing timeslip info
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Old 06-17-2008, 09:09 PM   #2
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Dude.. Good time for 10psi.. Nothing to be ashamed of!
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Old 06-17-2008, 09:33 PM   #3
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details on setup perhaps? 10psi doesnt mean ****.
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Old 06-17-2008, 09:35 PM   #4
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Quote:
Originally Posted by UrbanSoot View Post
details on setup perhaps? 10psi doesnt mean ****.


i know right....
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Old 06-17-2008, 09:41 PM   #5
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helluva good time man, need details on this setup!
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Old 06-17-2008, 09:51 PM   #6
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Quote:
Originally Posted by mkulak View Post
Dude.. Good time for 10psi.. Nothing to be ashamed of!
It's just that mathematically for the weight and mph (I trapped 108mph on the last run with a horrible 60') I should have been in the 12.6x range.


Quote:
Originally Posted by UrbanSoot View Post
details on setup perhaps? 10psi doesnt mean ****.
Ouch!

Fine, here's the whole story:
https://www.miataturbo.net/forum/showthread.php?t=11402

Cliff Notes:
1996 1.8 & Torsen w/ 197K miles in a bent 91 chassis
eBay Chinacharger T3/T4
Chinese exhaust manifold
Tial 38mm wg vta
full 3" exhaust, Dynomax straight through
eBay 18x12x3 core intercooler
new gen HKS SSQV bov
6spd (thanks Ben!)
standalone ecu
Walbro 255/550's/diy single feed rail/Mallory 4309 regulator
line lock

Average 26-29mpg, 31mpg when attempting to drive nicer. Autox as much as possible.

About one year and 8500 miles on most of this setup.
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Old 06-17-2008, 10:07 PM   #7
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i so need to get to a track.....curves or no curves, just wanna run through the damn gears and impress my ladies......by ladies i mean men.
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Old 06-18-2008, 12:58 AM   #8
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Nice times!
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Old 06-18-2008, 01:07 AM   #9
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Originally Posted by Braineack View Post
just wanna run through the damn gears and impress my ladies......by ladies i mean men.
tell me, why didnt i expect anything better from you?
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Old 06-18-2008, 01:08 AM   #10
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Quote:
Originally Posted by dvcn View Post
It's just that mathematically for the weight and mph (I trapped 108mph on the last run with a horrible 60') I should have been in the 12.6x range.



Ouch!

Fine, here's the whole story:
https://www.miataturbo.net/forum/showthread.php?t=11402

Cliff Notes:
1996 1.8 & Torsen w/ 197K miles in a bent 91 chassis
eBay Chinacharger T3/T4
Chinese exhaust manifold
Tial 38mm wg vta
full 3" exhaust, Dynomax straight through
eBay 18x12x3 core intercooler
new gen HKS SSQV bov
6spd (thanks Ben!)
standalone ecu
Walbro 255/550's/diy single feed rail/Mallory 4309 regulator
line lock

Average 26-29mpg, 31mpg when attempting to drive nicer. Autox as much as possible.

About one year and 8500 miles on most of this setup.
now im wondering how much longer this thing will last... not bad for ebay crap though
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Old 06-18-2008, 01:36 AM   #11
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Awesome! Makes me want drag radials real bad.
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Old 06-18-2008, 02:25 AM   #12
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Bent 91 chassis?
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Old 06-18-2008, 03:26 AM   #13
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Been to the dyno? Sub-13 is serious fast.

BTW, sell that ******* torsen ASAP. It's worth $600 right now and it won't be worth **** in a few more launches. Pick up an open '94 diff and swap an Rx7 LSD into it.
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Old 06-18-2008, 03:42 AM   #14
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actualy sav he is in croatia or some other destitute country devoid of most rx7's so the torsen is one of his few options besides shinny new stuff.
Awesome time for 10 psi btw
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Old 06-18-2008, 08:38 AM   #15
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Quote:
Originally Posted by dvcn View Post
It's just that mathematically for the weight and mph (I trapped 108mph on the last run with a horrible 60') I should have been in the 12.6x range.
Lol... horrible run.... eh. I ran a 13.75 at 109 basically with a 2.26 60ft... if you wanna talk about crappy runs

Nice time though
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Old 06-18-2008, 09:27 AM   #16
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Quote:
Originally Posted by ApexOnYou View Post
Bent 91 chassis?
The car came with a salvage title and hit hard in the back. I can't always hit the alignment numbers I want on the right rear.

Quote:
Originally Posted by Savington View Post
Been to the dyno? Sub-13 is serious fast.

BTW, sell that ******* torsen ASAP. It's worth $600 right now and it won't be worth **** in a few more launches. Pick up an open '94 diff and swap an Rx7 LSD into it.
No dyno, maybe if there is a really cheap local dyno day.

It does bother me that people are blowing up Torsens. Considering the car gets 15-30 full on drag radial/R compound launches a month I am a little worried. I also feel that it's driveline shock that breaks things. My co-driver and I never drop the clutch, we slip it for 5'-10'. The other thing is that I run the wimpiest clutch/pp that will hold the power, which currently is a Exedy stage 1 organic on a 1.6 aluminum flywheel. Won't chirp the tires in 3rd gear but has never slipped even after being launched hard 8-10 times in one hour.

Years ago I broke a trans input shaft on my street slick shod RX-3 w/ puck clutch and race pressure plate. This happened in 2nd gear but the damage was probably done while doing 4th gear chirps and many burnouts while holding the brake. Thus the line lock in evey play car since.

I do have feelers out for the RX-7 diff. I've come close a couple times.
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Old 06-18-2008, 09:37 AM   #17
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Quote:
Originally Posted by cardriverx View Post
Awesome! Makes me want drag radials real bad.
Last year I got a 1.99 60' on 195/60-14 Fuzion HRi's on daisies!

The first time I ran the five year old 225/50-15 BFG drag radials my best 60' was a 2.17 with an average of 2.25.

With the line lock and the ability to heat them a little, they did better this time. Still, with fresher drag radials or maybe the autox tires it should get a tenth or two on the 60'.

To make the launch more consistent and easier to control I'm thinking of hooking up the left horn button to activate smoother/lower boost. So I can hold the button on launch then release it when shifting to second gear.
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Old 06-18-2008, 10:08 AM   #18
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Quote:
Originally Posted by dvcn View Post
Last year I got a 1.99 60' on 195/60-14 Fuzion HRi's on daisies!

The first time I ran the five year old 225/50-15 BFG drag radials my best 60' was a 2.17 with an average of 2.25.

With the line lock and the ability to heat them a little, they did better this time. Still, with fresher drag radials or maybe the autox tires it should get a tenth or two on the 60'.

To make the launch more consistent and easier to control I'm thinking of hooking up the left horn button to activate smoother/lower boost. So I can hold the button on launch then release it when shifting to second gear.
Nice times.

Which line lock do you use? Have it plumbed right where the proportioning valve is?
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Old 06-18-2008, 01:10 PM   #19
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Any wheel hop issues? I could not even do a good burnout at the track with out the rear trying to hop and I had to get out of it.

Whats the suspension setup?
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Old 06-18-2008, 01:41 PM   #20
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Quote:
Originally Posted by pschmidt View Post
Nice times.

Which line lock do you use? Have it plumbed right where the proportioning valve is?
I'm using the Summit brand line lock.
http://store.summitracing.com/partde...5&autoview=sku

The stock prop valve is gone, I've got a Summit brand (rebadged Wilwood I think) adjustable prop valve on the rear brakes. It made a HUGE difference in braking.
http://store.summitracing.com/partde...5&autoview=sku

Quote:
Originally Posted by IcantDo55 View Post
Any wheel hop issues? I could not even do a good burnout at the track with out the rear trying to hop and I had to get out of it.

Whats the suspension setup?
I went from horrible wheel hop to almost none.

I need to spend the time to get my pictures together and make new thread on my wheelhop. In a nutshell, the cast spacer between the bottom of the diff and the ppf was split. The cause of that was an egged out hole on the ppf. The cause of that was probably a loose bolt. Pretty sure the car came that way. So changing the bushings to the Mazda comps, heavily welding up the 2nd cracked spacer, replacing the ppf (I had one laying around, otherwise I would have fixed the old one by welding and drilling/grinding) fixed things up pretty good.

Considering I autox a lot, my suspension is very underdeveloped. OTS konis, stock cut springs (probably way too stiff for the bumpy lot we run in), no rear bar, RB front hollow bar.

I didn't play with the shock settings at the strip. Someday I will. I should have put the rear on full stiff just to see the difference. The car does squat so to keep the weight transfer to the rear may help with the first gear traction.

Burnout:
Get a line lock, then do the burnout like the fast V8 guys. Drive around the water, back up into the waterbox, slowly spin the tires just a couple revolutions to wet things, drive forward a few feet to get out of the box. Pump and hold the brakes hard, engage linelock, release brake. Select 2nd gear, depending on where you make some tq, rev the motor and take the slack out of the driveline by easing the clutch out to the engagement point then release the clutch moderately hard. Modulate the throttle, keep the wheel speed up - this reduces hop. After you feel you've hurt your tires enough or are done impressing the kids, release the linelock and as you roll forward hit the gas hard to carry it out. Don't cross the staging beams or start line unless you run faster than a 10.0 ET. It's just track etiquette.
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