Newb question about R37/R38

http://jbperf.com/quad_ign_inj/index.html
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TexasVW
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Joined: Sat Feb 01, 2014 7:51 pm

Newb question about R37/R38

Post by TexasVW » Sat Feb 01, 2014 8:00 pm

Hello, I'm in the middle of my first MS build and I think I've got most things figured out. In the MSExtra build instructions, it says to link a wire across the pads (Step 22) if you leave out R37 and R38. Is this still required to use the 4 channel driver board?

MS2 V3.0
MSExtra code

jbelanger
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Re: Newb question about R37/R38

Post by jbelanger » Sat Feb 01, 2014 8:19 pm

Welcome to the forum!

No it's not needed since you won't be using the V3.0 injector drivers. Actually, you can leave out all the injector driver components (which will leave the heat sink almost empty as well as a good portion of the board).

Jean
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TexasVW
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Re: Newb question about R37/R38

Post by TexasVW » Sat Feb 01, 2014 8:54 pm

Thanks for the quick reply.

If you don't mind, another question please. If I run a wasted spark setup in the future, but keep sequential injection, what mods are necessary?

jbelanger
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Re: Newb question about R37/R38

Post by jbelanger » Sat Feb 01, 2014 9:00 pm

If you want to run wasted spark, you need to connect 2 ignition drivers per channel. That would mean you would connect 2 ignition driver to spark A and 2 to spark B (refer to this to know where spark A and B are located).

For sequential injection, you need to do the modifications shown on my site: http://www.jbperf.com/sequential/index.html#ms2mods. You also need a cam sensor.

Jean
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traceytad
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Re: Newb question about R37/R38

Post by traceytad » Tue Feb 11, 2020 12:54 pm

So, using the sequential board, if using wasted spark, would it be necessary to install a blocking diode for each driver signal? I'm assuming pairing spark driver signals for cyl 1-3 to coil 1 and for cyl 1-4 to coil 2? In other words, from the board, if the firing order is 1-3-4-2, then trigger signals 1 and 2 go to coil one which fires cyl 1&
3, then trigger signals 3&4 go to coil 2 which fires cyl 2&4?

jbelanger
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Re: Newb question about R37/R38

Post by jbelanger » Tue Feb 11, 2020 6:32 pm

traceytad wrote:
Tue Feb 11, 2020 12:54 pm
So, using the sequential board, if using wasted spark, would it be necessary to install a blocking diode for each driver signal? I'm assuming pairing spark driver signals for cyl 1-3 to coil 1 and for cyl 1-4 to coil 2? In other words, from the board, if the firing order is 1-3-4-2, then trigger signals 1 and 2 go to coil one which fires cyl 1&
3, then trigger signals 3&4 go to coil 2 which fires cyl 2&4?
I'm not sure I understand the question. If you're using wasted spark then you only have 2 spark outputs on the ECU and you use those 2 to connect to the board and then connect the 2 ignition drivers on the board to the 2 wasted spark coils. So you only use 2 of the 4 drivers on the board and there is nothing else to do since the drivers are independent.

Jean
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traceytad
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Re: Newb question about R37/R38

Post by traceytad » Wed Feb 12, 2020 10:34 am

Ok, thanks Jean. That is what I originally thought, but I guess I got lost in the mix. Thanks again!

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