1.6 Artech SR20 200hp 1/4 mile
 

Shit times, but it was my first time, with an open, x6 heat cycled Neo Gens....and I'm sure I'll think of some other excuses.

I'm 526J, my friend in the other lane is a 300+hp FWD LSD Galant on RS-3s, in major need of some drag setup tweaking. Currently both our cars are floating between DD and full track circuit duty. Both do exceptionally well at both.

https://www.miataturbo.net/attachmen...ine=1375595253

I kind of want to try this now.

Any idea what the car weighs?

2150+ my 185lbs. I cut about 50-60 lbs out race trim, I didn't do any prep for this though.

Bring it over...we can g-tech it.

Does the Galant weigh about 4000lbs?

The eighth mile is what is killing you. You have enough mph to go in the 13's. My guess you will see that mph go up if you worked on your driving. It takes a little practice.

My 1/8th mile mph was 84mph and I ran a 13.9. Look at the difference in 60' times between his 2 slips. Now look at the 1/4mil time. On the second slip, he should've beat the other cars time...why only 14.9?

Botched 2-3 shift. I saw huge improvements over 10 runs, definitely need practice. I have no idea how to properly launch a car, much less a turbo one. Well, I do, I just can't do it.

I ran 16.5 with my stock '90.

I understand that there are launch, shifting, and traction issues, but only two seconds faster for the double the power seems strange.

Everybody does it differently. A line lock makes it really simple, cause you don't need to foot the brake when staging, but who has a line lock?
My technique:
Roll until staging light comes on.
Stop.
Right foot holds brake pedal and side steps throttle, left foot releases clutch enough to feel it start to grab. Yellow light before green, I slip my foot off the brake fully onto the throttle at the same time as I dump the clutch. Then it's usually wheel hop for a few shakes, when my tach his 7,000 I bang second and repeat with each gear until I cross the finish. If you set your rev limit to like 8,000rpm's, you might cross the finish in 4th. Nothing sucks more than to put it in 5th right at the finish line.

The botched 2-3 shift sucks. I've done that a pile of times...go for 3 rd and put it right into 5th.

LOL at ONLY 2 seconds.

I never have my foot on the brake on the line. The track should be flat enough that you will not roll when staged. For a Miata, I always come out at a high rpm whether I am driving with a power adder or not. You never ever want to bog the motor. Some excessive wheel spin is better than bogging.

Most of your practice will be learning how to modulate the throttle at launch to match the tire you are using. Once you have that figured out, then you work on shifting. You need to experiment with different rpm shift points. It takes a few passes to really nail it down as to when is the best time to shift.

I looked at a few timeslips I had, and I started to get into the 13's @ 95 MPH when I had the less than ideal 95 cylinder head. That is of coarse with a good tire. You might have a hard time going into the 13's without a tire change, but I would wager that with practice your mph will go up some. It might be enough to get you there on the tire you are currently using.

yeah, redline...

Actually, if the little turbo has run out of breath already, redline is too high to shift. An engine might mechanically hold together to 9500 rpm but stop making power at 7000.

REDLINE.

The brake is often used to just barely load up the motor so you don't shock the ever-living shit out of the drivetrain.

Probably not a big deal when only making 200hp or less.

This may also be why i have good luck with my transmissions, despite having ragged most of them at the strip.

Totally untrue.

Too hard to have repeatable consistent results with a manual transmission. At least I never had much luck with that technique.

In my opinion, you should dyno and find out what rpm your torque starts to drop off at...that's the rpm where you shift.

because slowcar.

It's really not hard at all.... i'd suggest using e-brake instead of footbrake. You don't need to load it up hard, just a little bit.

My feet can barely handle a standard launch with controlled RPM at the yellows, I wasn't about to ask them to coordinate any brake/clutch/gas dancing.

All shifts were indeed at 7000rpm, or as close as my adrenaline fueled brain could get them, there were a few 7200 shifts in there I'm sure.

The botched shift wasn't to 5th, it just wouldn't go in. There's some fluid dripping from my clutch hard line where it goes into my brand new master cylinder, I may of been loosing some pressure there. Once my wife has a minute to help me, I'll see if I can see some bubbles there and do some further investigation. Otherwise, although my times sucked, I had a blast and that little clutch line issue seems to be the only gremlin after 10 runs.

What did you run in the 1/4?

you don't want to shift at torque peak, you want to shift well past the torque peak.

*edit: and if this vd is accurate
https://www.miataturbo.net/build-thr...e3/#post922080

then shifting at redline is perfectly fine on your setup

Not that that's where I shift...but in my mind unless you're really awesome at drag racing, lets say peak torque is 6,600. By the time you react, it'll be later than that.

There are all kinds of theories on when you shift, but when it comes down to maximizing the full potential of your driving, you need to practice and experiment. How well the transmission shifts, driver reaction, and power all play a role.

Here's the real dyno, sorry, I thought I had posted it somewhere.
https://www.miataturbo.net/attachmen...ine=1375678889

The dyno was all around fail too, I wasn't driving the car, and he wouldn't start below 2400 or go to 7000. The red line was an accuracy thing though, on the last run I told him to ignore the tach and go by the laptop tach, still didn't read 7000 on the dyno.

clearly you should shift at 5K. that's why you are so fucking slow.

:laugh:

no way bro, that's overspinning it like crazy.
his torque peaks at 4500

its all practice practice practice man.
get you a lil logbook and try different shift points and launchin rpm and take notes on what you did each pass. the easies and cheapest way to go faster is drive it better.
at least your at the dragsrtip. most of these 300 hp Miata fags wouldn't dare take their shit out there

If I was precise enough, I'd write down my launch RPMs and results, however those first 10 passes I was too nervous to look away from the lights. I went off engine sound, and was fairly consistent after a pass or two, slowly upping the revs until my epic launch that netted me my best 60', although that's the one I botched the 2-3 shift :(

Careful with the fag word, you're in a mod's thread with the admin regularly replying and you're insulting members with 20,000 posts. After all, it was only my first visit.

post videos of your 300hp miata at the drag strip bro.
we all need to take notes.

Why would you try different shift points? Stock rods bend above ~7200, so that's when you should be shifting.

Plus, when the stock rods bend it will lower compression ratio some so you can run more timing. Win-win!

lolol win

next time to the dragstrip ill take a video. my Miata only has around 200 wheel tho.

This is kind of a necrothread but wouldn't the mechanical advantage of being in a lower gear outweigh the torque loss as you near the redline? Unless your ratios are that close.

That's how I always thought of it, at least.

Typically, the fastest way down the drag strip is to be at your peak horsepower in a 1:1 gear at the trap.

Finally made it back. 9 years of hard labor, expensive parts, blood, sweat, and tears, and I managed a 13.5. This time at Woodburn drag strip with some co-workers testing a 335. Still shit tires (RS4), still shit driver (me), but I had a torsen, 1.8, and 250hp. 12s would be easy with a decent tire and driver.

Dang! this one was resurrected from the grave lol....

Congrats. Trapping 85mph in the 1/8th is not too shabby for a daily driver 4 cylinder. You are faster than my 06 wrx i used to have. It was mechanically stock but I mildly tuned up a bit with romraider. It only trapped 77mph in the 1/8.

The best run of the night, that 13.5, was actually my first run, when I didn’t launch, just took off like a slightly aggressive grandma, shifted slowly, banged off the limiter in 4th for a bit, and decided to try 5th finally. Thought for sure I’d be in the 12s by the end of the night.

Blast from the past. So heartwarming to see the OG's still around and doing miata things :likecat: