MS2/Extra 3.57 4CYL Sequential Wiring for jbperf v1.1 P&H

http://jbperf.com/p&h_board/index.html

MS2/Extra 3.57 4CYL Sequential Wiring for jbperf v1.1 P&H

Postby jsdevel » Mon Nov 28, 2016 11:34 am

This post is mainly to confirm that the following wiring diagram is correct for MS2/Extra v3.57 or v3 boards with the "Sequential Fuel Injection" mod. Can someone confirm that the wiring in the attachment is correct? I'd like to connect directly to the MS2 CPU pins underneath the board.

The following are the relevant sections from the msextra MS2/V3.57 Hardware Manual:

4.10.4 Sequential injection 'mod'

...

The picture below shows the MS2 card modification which connects pin 1 of the NAND gate chip (U2) on the
MS2 card to pin 4 of the 40-pin header and pin 4 of U2 to pin 5 of the header.

Image

With that modification, pins 3 and 7 of the MS2 CPU can be used for injector channels 3 and 4, respectively.
They now connect to pins 4 and 5 of the pin header. It should be noted also that the CPU pins corresponding to
injector channels 1 and 2 are already directly connected to the 40-pin header at pins 39 and 40.
Attachments
wiring.jpg
wiring.jpg (176.02 KiB) Viewed 1643 times
Last edited by jsdevel on Mon Nov 28, 2016 6:40 pm, edited 2 times in total.
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Re: MS2/Extra 3.57 4CYL Sequential Wiring for jbperf v1.1 P&

Postby jbelanger » Mon Nov 28, 2016 1:23 pm

You're not using the correct end of the 40-pin socket as pin 1. Pin 1 is in the lower right corner on your picture of the v3.57 board. And you should make sure your MS2 card is also inserted the correct way (you can see the pin 1 indication in the picture).

Having said that, there is a potentially major problem with using a v3.57 board for this application. To use the MS2 modification and pins 4 and 5 on the 40-pin socket as injector channels 3 and 4, you need to remove the oscillator components from the board. On the V3.0 board, that's easy. On the v3.57 that means removing the SMD components and that can be more of a pain depending on your ability to work with surface mount components. You need to remove R22, R23, C24, C25 and Y1 (the crystal). If those are not removed, you won't have properly working channels 3 and 4, if they work at all. You can also remove R21, C20, C21 or leave them there depending on which is easier for you.

Jean
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Re: MS2/Extra 3.57 4CYL Sequential Wiring for jbperf v1.1 P&

Postby jsdevel » Mon Nov 28, 2016 6:30 pm

Having said that, there is a potentially major problem with using a v3.57 board for this application. To use the MS2 modification and pins 4 and 5 on the 40-pin socket as injector channels 3 and 4, you need to remove the oscillator components from the board. On the V3.0 board, that's easy. On the v3.57 that means removing the SMD components and that can be more of a pain depending on your ability to work with surface mount components. You need to remove R22, R23, C24, C25 and Y1 (the crystal). If those are not removed, you won't have properly working channels 3 and 4, if they work at all. You can also remove R21, C20, C21 or leave them there depending on which is easier for you.


Thanks Jean. I have removed those components and I've updated the wiring in the attachment. Does it look correct now?
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Re: MS2/Extra 3.57 4CYL Sequential Wiring for jbperf v1.1 P&

Postby jbelanger » Mon Nov 28, 2016 6:36 pm

There is one more thing. You need to invert channels 1 and 2 because they connect to pins 40 and 39 respectively, not 39 and 40. You can check the schematics: http://www.msextra.com/doc/pdf/html/MS2 ... 4-165.html

Besides that inversion, it looks ok.

Jean
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Re: MS2/Extra 3.57 4CYL Sequential Wiring for jbperf v1.1 P&

Postby jsdevel » Mon Nov 28, 2016 6:41 pm

I've updated the attachment to eliminate confusion. Thanks again!
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