MS3X jumper from C end of D1 to s12

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nismoautoxr
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MS3X jumper from C end of D1 to s12

Post by nismoautoxr »

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
jsmcortina
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Re: MS3X jumper from C end of D1 to s12

Post by jsmcortina »

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 repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

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nismoautoxr
Super MS/Extra'er
Posts: 2631
Joined: Sun May 29, 2011 10:28 am
Location: birmingham ,Alabama. U.S.A.

Re: MS3X jumper from C end of D1 to s12

Post by nismoautoxr »

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
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