MS3X jumper from C end of D1 to s12

Ask questions about DIY board assembly issues, fault finding and testing. (Covers all Megasquirt versions and board.)

Moderators: jsmcortina, muythaibxr

MS3X jumper from C end of D1 to s12

Postby nismoautoxr » Mon Nov 13, 2017 1:44 pm

I have just seen this note on installing a jumper wire from the c end of D1 on the X card to S12 on the main board if using the MS3x outputs for a idle valve or a VVT valve. Ive been using VVT for a while now without this lead. How crucial is this lead to have installed?
http://www.msextra.com/doc/pdf/html/MS3 ... e-1.4.html
Ricky-
1995 Nissan 240sx, 403 LS strokerv8 N/A 6speed trans
MS3&MS3X v.3.0 PCB
42lb/hr Hi-Z inj.,230/232 @.050 on 114LSA cam
sequential fuel and sequential spark
LS3/LSA card MAF sensor
97 Mazda MX5
MS3 2002 vvt motor
.60 trim T4 Turbo at 15 PSI
nismoautoxr
Super MS/Extra'er
 
Posts: 2613
Joined: Sun May 29, 2011 10:28 am
Location: birmingham ,Alabama. U.S.A.

Re: MS3X jumper from C end of D1 to s12

Postby jsmcortina » Tue Nov 14, 2017 5:21 am

Early on one customer reported that a component on the MS3X board got so hot, it de-soldered when using VVT on his Miata. With the jumper wire in place that doesn't happen.
I've found that my idle valve has a wider duty cycle range (more controllable) with the jumper wire in place.

James
I can supply, repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: viewtopic.php?f=104&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
jsmcortina
Site Admin
 
Posts: 33987
Joined: Mon May 03, 2004 1:34 am
Location: Birmingham, UK

Re: MS3X jumper from C end of D1 to s12

Postby nismoautoxr » Tue Nov 14, 2017 6:14 am

I went ahead and added it just to be on the safe side on my miata. I may add it to my 240 next time I have to open it.
Ricky-
1995 Nissan 240sx, 403 LS strokerv8 N/A 6speed trans
MS3&MS3X v.3.0 PCB
42lb/hr Hi-Z inj.,230/232 @.050 on 114LSA cam
sequential fuel and sequential spark
LS3/LSA card MAF sensor
97 Mazda MX5
MS3 2002 vvt motor
.60 trim T4 Turbo at 15 PSI
nismoautoxr
Super MS/Extra'er
 
Posts: 2613
Joined: Sun May 29, 2011 10:28 am
Location: birmingham ,Alabama. U.S.A.


Return to Board assembly and testing

Who is online

Users browsing this forum: thedude and 1 guest