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Old 04-01-2015, 01:39 PM   #1
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Red face ITT: Ponderings about shock settings for drag strip

First and foremost: I know our cars suck at the strip. Second: this isn't some super serious thread for ultimate drag racing setups. Third: I'm looking for the discussion that we've already had about this a very long time ago, and knowledgeable guys on this subject (like miata2fast) posted about this already, but not finding it.

So here goes:
I'm hitting the strip tonight in the msm. Just a handful of bolt ons, ms, and street tires. A street tuned "big enchilada" if you will. I don't expect it to be fast, but hoping for low 14's/high 13's

My tokicos are normally on setting 2 all around, VERY soft and VERY comfortable and I love them for daily driving.

Should I set the fronts to full soft and rears to full stiff for best weight transfer and traction off the line? Will it even matter, at all? lol
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Old 04-01-2015, 01:50 PM   #2
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I will let Troy correct anything that is wrong in what I am about to say but I like to think I pick up things from him now and again during his endless rants about chassis setup for the strip. The basic idea is that you want the car to come from a positive camber setting to flat camber when it squats on the launch to ensure that the largest amount of the contact patch is on the ground. The rear definitely needs to be stiffened and possibly raised a bit. but exactly how much is really a trial and error game that will need tweaking at the strip to find the best settings.

Prepare yourself for Troy to tell you that at a minimum you need slicks, to launch at 7k, and install 4.78 ring and pinion for result
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Old 04-01-2015, 02:03 PM   #3
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haha yeah that guy is hardcore, I really enjoyed reading his posts just like you.
It has FM springs, so no height adjustment, though the car is slightly raked so that's good. I'm looking to play with the shock settings and maybe tire pressures, that's about it. I doubt anything more is worth the trouble, and this is just for fun anyways.
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Old 04-01-2015, 03:06 PM   #4
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Practice your launching, that will make the biggest difference at the drag strip. Make sure you spin the water off the tires if it's the kind of track where you have to roll through the water. With tired RE11's, I normally keep revs around 7K and ride the clutch to 40mph.

I don't know how you should adjust the suspension.
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Old 04-01-2015, 03:21 PM   #5
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We have the option of going around the burnout box, so I plan to do that since its pointless with these street tires.

Ride clutch to 40? You have a 3.6 RP or just revving it to kingdom come?

I have the 4.1 so my gears are stupid short
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Old 04-01-2015, 03:41 PM   #6
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Go around burnout box, spin tires after just to clean em.
If you're going just to see what it runs in the 1/4, then **** on reaction time. Leave on green and pull out however you can mix clutch slippage/ traction that doesn't create massive wheel hop.
Good luck, post vids/ time slip.
Have fun!
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Old 04-01-2015, 06:33 PM   #7
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Quote:
Originally Posted by 18psi View Post
We have the option of going around the burnout box, so I plan to do that since its pointless with these street tires.

Ride clutch to 40? You have a 3.6 RP or just revving it to kingdom come?

I have the 4.1 so my gears are stupid short
4.10 gears, around 8,800 redline.

As for launching yes just ride the clutch, that's the easiest and fastest way I've found to consistently get 1.9 60's on street tires. These were done with no limited slip too. Keeping the revs high prevents you from bogging, and with practice you can ride the clutch to keep the tires close to the limit to get maximum torque to the ground.
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Old 04-01-2015, 09:55 PM   #8
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Quote:
Originally Posted by patsmx5 View Post
4.10 gears, around 8,800 redline.

As for launching yes just ride the clutch, that's the easiest and fastest way I've found to consistently get 1.9 60's on street tires. These were done with no limited slip too. Keeping the revs high prevents you from bogging, and with practice you can ride the clutch to keep the tires close to the limit to get maximum torque to the ground.
I launch in 2nd (6 speed), probably don't ride the clutch as long as you do.

USE MS3's LAUNCH FEATURES!! Let it ramp up timing and boost after launch and you'll get stupid fast (for a Miata) and consistent. Here is a good example of what happens when you dial in MS3-Pro's power management after launch features. I'll try to get actual Miata footage later this year.


Last edited by Ben; 04-01-2015 at 10:08 PM.
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Old 04-02-2015, 01:41 AM   #9
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Welp, first ever track trip in this car went GREAT!!!

So much fun, and the car surprised me (in a good way) and ran fantastic. Overall had a blast.

Lets start off with the basics:

2004 MSM with 72k miles
intake/downpipe/exhaust/intercooler/pnp-pro
ONLY 9psi
CA PUMP 91oct junk gas
205/50 all seasons

I set the rear shocks to full stiff, left fronts at 2 (soft). Tires at 28psi

1st run I launched it at 4k, it spun a little hooked, then I just WOT, and it BLEW OFF the rear tires. Went from spinning, to violent wheel hop, to bouncing off the limiter. '60 was hilariously terrible lol

14.2 @ 101.3 with 2.33 '60 LOL
Was kinda happy with it all things considered.

2nd run I was way less liberal with the throttle, fed in about half and basically babied it til 2nd gear.

14.089 @ 101.7 with a 2.27 '60
LOL
Not bad, I was happy with the progress, but the tires were just not going to hook, period.

3rd run, I fed in about 60% throttle and tapered it to WOT past 5500

13.85 @ 102.85 with a still terrible '60 of 2.291 LOL
WHAT?! I was really surprised. Didn't feel like it had any more in it, and the tires were just not going to grip at all since it was getting colder, so I called it a day.

Overall, I'm really really happy with how this 1st trip went and really impressed with the car. Tempted to throw in e85 now and crank up the boost but really not sure I even care that much. The car feels great, and is my daily driver.

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ITT: Ponderings about shock settings for drag strip-20150401_212620-1.jpg   ITT: Ponderings about shock settings for drag strip-20150401_210241.jpg   ITT: Ponderings about shock settings for drag strip-msm%2520drag%2520strip%2520pull%25204%25201%252015.png  
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Old 04-02-2015, 01:46 AM   #10
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Quote:
Originally Posted by Ben View Post
I launch in 2nd (6 speed), probably don't ride the clutch as long as you do.

USE MS3's LAUNCH FEATURES!! Let it ramp up timing and boost after launch and you'll get stupid fast (for a Miata) and consistent. Here is a good example of what happens when you dial in MS3-Pro's power management after launch features. I'll try to get actual Miata footage later this year.

[YT]nQHQk3zarGg?[YT]
I SOOOOOOoooooo wanted to mess with that, but I went to the track straight from work today, and only found out about the jumper for LC from Matt while at work this afternoon, so no Launch Control for me today.

I will definitely be trying that soon though. Looks like there's some really cool features with the new LC setup
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Old 04-02-2015, 01:50 AM   #11
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Awesome MPH. Decent non-abusive 60' times too.
The times dropped 'cause the outside air temps dropped.

Some things never change at Sac Raceway... like the faster nighttime runs. Also Sac is usually 1 to 2 10ths faster than Sears Point.

Got to say, completely envious of your MPH. My n/a NA can only manage an 87mph down here at Sears Point. 15.80s at 87 mind you, with an almost identical 60' time.
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Old 04-02-2015, 02:25 AM   #12
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Old 04-02-2015, 04:26 AM   #13
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Car looks great vlad.

That ain't no track though. Strip.
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Old 04-02-2015, 10:10 AM   #14
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Watch that timing, at 9psi we're around 18.5*, looks like you're up around 22? Definitely get on the dyno, these cars and their crazy fast spool scare me after our experience with Laz and his bent rods.
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Old 04-02-2015, 10:22 AM   #15
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Quote:
Originally Posted by curly View Post
Watch that timing, at 9psi we're around 18.5*, looks like you're up around 22? Definitely get on the dyno, these cars and their crazy fast spool scare me after our experience with Laz and his bent rods.

I'd be more worried about it from a det perspective, but i doubt he's seeing anything looking at the log screenshot. No way at 9psi he's making enough torque to hurt the rods, even taking into consideration a hard and rough spool up.

Vteckiller2000 did end up doing around 260wtq out of my old car, but that was a bit more boosto, and was probably pretty ill-advised.
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Old 04-02-2015, 12:07 PM   #16
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Quote:
Originally Posted by Ben View Post
USE MS3's LAUNCH FEATURES!! Let it ramp up timing and boost after launch and you'll get stupid fast (for a Miata) and consistent. Here is a good example of what happens when you dial in MS3-Pro's power management after launch features. I'll try to get actual Miata footage later this year.
Tell me more about this. I currently am using the boost timed after launch but what settings are you using for timing and also fuel/spark cut/timing retard before launch?
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Old 04-02-2015, 12:45 PM   #17
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Thanks all.

The 18 is at 6400 rpm, and the max 22 is at 7000. At peak torque I'm at like 14-15 iirc.
But yeah I wasn't going to turn it up any more, and the engine seems really happy and not pinging.

This is actually a couple degrees LOWER than the base map from DIY fwiw
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Old 04-02-2015, 01:20 PM   #18
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Your performance is so damned close to my bone stock 300Z twin turbo that I am almost kicking myself for going the NA route.

It ran 13.70s at 103 with identical 60' times at Sac.
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Old 04-02-2015, 02:16 PM   #19
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Ps. Firm is bad.
You want the front to lift easily and the rear to squat for traction.

If you go again, turn both ends to full soft... At least that's what I would do!

Heck, disconnect an end link up front as well to help the front rise and transfer weight to the rear too... Probably help with the sixty foot, though it won't make a bit of difference in your trap speeds.
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Old 04-02-2015, 02:28 PM   #20
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Not sure if this was mentioned, but I wonder if disconnecting the front swaybar would be worth a try.
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