Launch control - misfire under load
 

Hey guys.
When I built my MS2 a few months ago I never did the MS2 daughterboard mod to enable launch control (http://www.msextra.com/doc/ms2extra/...#mods_daughter)

Well last week I soldered that wire, enabled launch control. Works great... except now I get spikes in AFR under load (car is N/A). I changed the plugs (BKR6E-11) and it still happens. I have COPs, which were installed like 2 weeks ago and I haven't had any issues with it.

I just did a log where I did 2 launches, pulled over, turned off launch control and did a normal launch.

spikes with launch control in 2nd and 3rd gear WOT:
http://s95367906.onlinehome.us/photo...ch_control.pn_

no spikes without launch control, also 2nd and 3rd WOT:
http://s95367906.onlinehome.us/photo...ch_control.pn_

Other things I've done lately was exhintake mod, but haven't had any issues.


log: http://s95367906.onlinehome.us/photo...1_12.16.20.msl
msq: http://s95367906.onlinehome.us/photo...1_12.47.07.msq

is flastshift enabled? are you sure you're not enaging launchcut when shifting?

please attach images here so I can see.

Flat shift is not enabled. And I hate how PNGs get converted to shitty jpg when attached :(

i bet you $10 your launch control is getting activated when you shift and reapply gas.

enable flastshift and ramp up the limiter to 7K or increase your TPS threashold to like +80%

Wouldn't that cause *dramatic* changes in the log? All that happens is AFR goes from 12.0 to 13.2 and back to 12.0 in 0.1 seconds.

But I can hear it :(

Here's another log from last night... 3 spikes :vash:
http://s95367906.onlinehome.us/photo...afr_spikes.pn_
also attached both logs (today and yesterday) and tune.

oh i see what what youre saying; i miss understood.

I thinking it's a hardware issue. I'll post pictures of my MS tonight or tomorrow.

When I first built it, I didn't remove the ST SIGN fuse. A diode burned, which I replaced. Has been working fine ever since, but who knows...?

that only matters if you are driving the fuel pump through a TIP125 out to 1C.

I am running the fuel pump through a TIP. I fixed it ages ago and it works fine. Le sigh.

Would running more dwell help? (I'm pulling ideas out of my ass). Log shows actual dwell of anywhere from 2.4 @ 12.7 to 2.13 @ 14.4

Ignition & Dwell curve settings
https://www.miataturbo.net/attachmen...1&d=1318363593
https://www.miataturbo.net/attachmen...1&d=1318363597

figured I'm just going to wait till dyno day. also FYI you can't set flat shift engagement point to 7000+, tuner studio won't let you.

I bumped dwell to 2.5ms and that did absolutely nothing.