Launch Control FTMFW
 

building 5psi on the line is so choice.

I tried to record my spool throughout the gear, but that didnt work out so well.

his res video: http://www.boostedmiata.com/videos/launch_control.AVI

you tube crap that you probably cant read the numbers on my gauge:

lame :)

wanna race, Russie!?

Nice! Seems a bit low-rev for launch control, or was this more for proof-of-concept?

when it works.

proof of concept. i have it at 3700 right now. i really have no use for it other to impress the ladies....and by ladies i mean men.

Mine is at 2800 and I still get a bit too much spin depending on the surface. And thats with 275/35/15 Hoosier A6's. What tires etc are you running to need 3700 rpm at launch? I want some.

you assume i've actually done more than what i just took a video of....i do want to find the golden spot for autox launches.

So, it's just pin 12 and pin 13 jumpered together (with a PNP), then remove my FM clutchswitch dealie?

If you mean neutral safety switch defeater, you dont have to remove it. There are 2 clutch switches. The one next to the firewall is for neutral safety. It is pressed in when the clutch pedal is down. The one for launch control is the one closer to the driver and it is pressed in when the clutch pedal is up.

I forget which one it was, it was back when I first got my Miata (second mod after ripping out the door buzzer). I'll take a look-see and then figure out a circuit to defeat the clutch having to be pressed to start.

you'll want to remove the FM clip. otherwise it will tell the MS the clutch is depressed 100% of the time, and launch will always be activated in gear....wont get you too far down the road.

fwiw, the clutch and neutral switch share the same input.

then why are there two switches?

Whats the rule of thumb? Fuel cut if you have a cat and spark cut if you dont?

https://www.miataturbo.net/forum/sho...ontrol+neutral

i guess i have a shitty memory. I did remember that i asked this question a while back.

spark cut = flames and pwnage
fuel cut = tame, yet effective.

with the MSPNP i was able to keep the FM clutch switch, the launch control uses the switch that turns off the cruse control when you hit the clutch (the one that is closest to the driver)

only thing i had to unplug was the switch for the transmission that told it was in nurtral or in gear.
I have a 97, im not sure if other years had them. Its to cut cruse off if you full it out of gear going down the highway, if you dont the PNP sees it as being in launch control at all times, if i remembr correctly.

This is what I have setup. Only tested by watching for Launch to light up in MT though. I also just unplugged the top clutch switch and ran a jumper wire... same deal as the FM one... but free ;)

n/m, leave the FM thingy in tact, different signal (starter interlock switch).


but neutral switch still needs to take a dump.

So then the verdict is leave the FM clip in place, but unplug the neutral safety switch?

I no haz no steenkin' CC anyway so that's not a factor.

so, is this, or is it not the same thing as 2-step?

It is the 2step basically. Realize that he has it setup as just Fuel cut, which is quite soft. I believe his engage/cut distances are on the larger side also, which would make it softer also.

You could make your launch stuff look like this....

that's pretty sweet, i'll add it to the list of things i never get to

Is it set to fuel cut only? The rev limiter seems a bit slow. Mine is set to spark only and acts similar to the video Splitime posted. Set the limiter at 5 base 3 cut, seems to work fine so I left it.

I dont like spark cut, it's spark/fuel so it behaves differently. but hell, it still spools the turbo.

Have you tried launching with it yet? Even at 10psi I had no traction on the street with it set at 2200. I am going to rig up something so that I run waste gate pressure for launch control (~6psi), then back to whatever the MBC is set at once the clutch is out, just have to find the parts now.

You have a EBC running with MS right?

what kinda EGT you see scott?

Does the MS do anything with ignition during launch control?

im sure it gets up there....probably not as much as with spark cut, but there is a good video on youtube where you can see him hit 1400*F fast.

It can cut off the ignition if you want it to.

I don't suppose DIY autotune will take an FM link as a trade in huh? :) I'd like launch control.

I'm a little confused :noob:

The manual says this:

"Launch Control

(clutch switch jumper wire required at center connector, or you can wire a separate switch/button)

You can use either the stock clutch switch or an external switch for launch control. To use the stock clutch switch, connect pins 12 and 13 together on the center connector. If you want to use your own switch for launch control, connect pin 12 to one terminal of a momentary contact switch and the other terminal on the switch to a chassis ground. Launch control is turned off by default in the tuning software—you can access it’s config in Megatune from the ‘Advanced’ Menu under ‘Launch Control’."

it doesn't say anything about the neutral safety switch, why am I supposed to unplug it?

Posting to express love for Brain's old busted ass Eclipse tape player

cd player, and it works fully. i just use an allen wrench for the volume up button.

once you have it hooked up, see how it reacts with the car to ON. the launch control light with light up red when active. if its on in gear, regardless of the clutch, you need to unplug it. it's the two white little connectors off the top of the tranny.

Thanks, I think I answered my own question by going to page 1 and looking at the diagram you posted. So I would basically need to unplug the NSS so that it's not completing the circuit, which would in effect tell the MS that I had dumped the clutch. amirite?

bascially, if you look at the switches

the clutch switch is only grounded when depressed, perfect signal for launch control. clutch down, activate launch control above X tps.

the safety switch grounds when in gear. not cool, MS will think the clutch is down and you wont be able to drive forward when you push the throttle past your trigger.


speaking of, not certain launch control works with a tps signal.....not sure if the PNP addresses this.

My bad. I mixed you up with whoever has that shit ass tape player on here. I only saw the corner of it and assumed it was that one ;)

trying it now..

i replaced the busted ass tape player for a busted ass cd player.

So, I connected 12 & 13, unplugged the two white connectors next to the trans, and turned launch control on in megatune. Nothing. The little box at the bottom of the megatune window still says launch off too. WTF?

I wish my Link ECU had launch control. I’m jealous.

needs more tps....i guess.

booo @ that hypothesis...

The safety switch is grounded when in neutral, not in gear. You can have both plugged in - and no TPS - and have the launch control still work.

hrmm.. I wonder what's up with mine then.. I suppose I'll go try a few configurations.

what settings do you have for launch control?

im thinking maybe the rpm or tps settings may be off so its not activating right

i could never get mine to work without TPS, which is why I went and got it done. but again is this not with the MSPNP. It's quite possible that the TP input needs some sort of voltage, just so it know it has a signal, and you can easily then use the tps calibrate button to make your throttle 100% all the time....i dunno, fishing. talk to mr cramer, he's smarter than i.