Launch Control Not Working In Gear With Clutch Depressed - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MSPNP MSPNP specific Megasquirt related discussion.

Reply
 
 
 
LinkBack Thread Tools
Old 04-25-2012, 11:36 PM   #1
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Apr 2007
Location: Charlottesville, VA
Posts: 177
Total Cats: 0
Default Launch Control Not Working In Gear With Clutch Depressed

I just got my MSPNP installed and tuned with the autotune feature on tunerstudio and decided to set up launch control. Well it works fine in neutral with or without the clutch pedal depressed, but as soon as I put it into first with the clutch pedal still depressed it revs freely. I was thinking the clutch switch is bad, but I would assume that would make the car either 1. not start or 2. start without depressing the clutch pedal. Neither of those is happening.

Any ideas?
f1luva92 is offline   Reply With Quote
Old 04-26-2012, 12:12 AM   #2
Junior Member
 
Join Date: Sep 2010
Location: SFL
Posts: 376
Total Cats: 3
Default

there are 2 separate switched on the clutch, one for starter inhibition, and one for the ecu. the latter is the one for launch, and should be brown/white.

bypassing it with a jumper should result in launch being "stuck" on if everything else checks out.
MD323 is offline   Reply With Quote
Old 04-26-2012, 09:34 AM   #3
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Apr 2007
Location: Charlottesville, VA
Posts: 177
Total Cats: 0
Default

ahh ok. that makes sense.
f1luva92 is offline   Reply With Quote
Old 04-26-2012, 10:02 AM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

you need to unplug your neutral safety switch from the trans.
Braineack is offline   Reply With Quote
Old 04-26-2012, 11:43 AM   #5
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Apr 2007
Location: Charlottesville, VA
Posts: 177
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
you need to unplug your neutral safety switch from the trans.
they really should have put that in the manual just sayin. Haha. I'll give it a shot after work.

THANKS!
f1luva92 is offline   Reply With Quote
Old 04-26-2012, 12:03 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

not eveyrone has it. iirc, it only came on cruise controlled miatas.
Braineack is offline   Reply With Quote
Old 04-26-2012, 04:53 PM   #7
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Apr 2007
Location: Charlottesville, VA
Posts: 177
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
not eveyrone has it. iirc, it only came on cruise controlled miatas.
which mine originally was. makes sense now. i'm getting off work in about an hour so i'll try to do it then. where exactly is it on the trans, i could spend the time finding it, but i'd like to be able to unplug it before i leave here, and go directly to summer duck drag strip

nevermind i found it on mitchell
f1luva92 is offline   Reply With Quote
Old 04-26-2012, 06:39 PM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

towards the middle on the top (shifter area), the white connector.
Braineack is offline   Reply With Quote
Old 04-30-2012, 05:41 PM   #9
Junior Member
 
Oskinosmee's Avatar
 
Join Date: Jan 2012
Posts: 59
Total Cats: -8
Default

Hows it run with the autotune?
Oskinosmee is offline   Reply With Quote
Old 04-30-2012, 05:50 PM   #10
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Apr 2007
Location: Charlottesville, VA
Posts: 177
Total Cats: 0
Default

it runs pretty good. i'm still tracking down a massive boost leak, so i'm hardly building any boost. So i guess you could say i'm not a good judge right now.

and by the way. the reason LC wasnt working in gear is because the spring in the clutch switch was broken. so i replaced it with a click-pen spring. works just fine now.
f1luva92 is offline   Reply With Quote
Old 04-30-2012, 06:59 PM   #11
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

ha great.
Braineack is offline   Reply With Quote
Old 05-02-2012, 02:23 PM   #12
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 199
Total Cats: -12
Default

Well, I'm having an odd but similar problem... My launch control is on at all times, when activated on the ECU.

I was tuning it with autotune before, so this never happened, but today while cruising I noticed the car won't rev past 2500RPM, and ignition retards to 5. That's the launch control being active. If I disable it, the car revs just fine.

Should the launch control not work, or do I have to check if my clutch switch is broken? Should the circuit be closed or open, for launch control to be enabled?
ThunderFox is offline   Reply With Quote
Old 05-02-2012, 02:56 PM   #13
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

do you have a vTPS? since you have a 91, I'm assuming no.

if you watch your throttle input gauge, youll notice it's constantly increasing to 100% i bet.

you need to make sure your throttle % threshold is set really really really high, in fact I wouldn't use launch control without a vTPS.
Braineack is offline   Reply With Quote
Old 05-02-2012, 03:02 PM   #14
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 199
Total Cats: -12
Default

I disabled it for the time being. It serves no purpose to me. My only worry is that I might have a bad clutch switch!
ThunderFox is offline   Reply With Quote
Old 05-02-2012, 03:06 PM   #15
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

or you havent unhooked your neutral saftey switch. car had/has cruise control?
Braineack is offline   Reply With Quote
Old 05-02-2012, 03:08 PM   #16
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 199
Total Cats: -12
Default

Nope, no cruise. And it doesn't have that other switch that miatas seem to have either, which prevents them from starting with the clutch depressed.
ThunderFox is offline   Reply With Quote
Old 05-02-2012, 03:10 PM   #17
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,860
Total Cats: 1,788
Default

thats the starter interlock switch which is different.
Braineack is offline   Reply With Quote
Old 05-02-2012, 05:31 PM   #18
Elite Member
iTrader: (17)
 
Join Date: Aug 2007
Location: Fort Myers, FL
Posts: 2,791
Total Cats: 130
Default

Is removal of the neutral safety switch and setting up the software all you have to do to get launch control working one of Brain's MSPNPs? I was under the impression you had to actually wire the clutch switch up and I couldn't ever figure it out.
pdexta is offline   Reply With Quote
Old 05-04-2012, 09:20 AM   #19
Junior Member
Thread Starter
iTrader: (3)
 
Join Date: Apr 2007
Location: Charlottesville, VA
Posts: 177
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post
do you have a vTPS? since you have a 91, I'm assuming no.

if you watch your throttle input gauge, youll notice it's constantly increasing to 100% i bet.

you need to make sure your throttle % threshold is set really really really high, in fact I wouldn't use launch control without a vTPS.
i'm glad you mentioned that because i got curious and looked at my throttle input gauge... it doesnt change.
f1luva92 is offline   Reply With Quote
Old 05-04-2012, 09:23 AM   #20
Junior Member
 
Join Date: Mar 2012
Location: Portugal
Posts: 199
Total Cats: -12
Default

You should know though... Didn't you have to disconnect your TPS?
ThunderFox is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1991 special edition with hard top full part out JC, NJ russian Miata parts for sale/trade 6 10-08-2015 04:01 PM
3rd Time's a Charm...hopefully. zephyrusaurai Meet and Greet 2 09-28-2015 11:59 PM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 06:31 AM.