Easiest ignition triggering using MSD6a

DeneOehme · Post by **DeneOehme** » Sun Jul 16, 2006 9:27 pm

At the moment I'm running fuel only MSnS with MSD6a and a recurved dizzy.

What I want to do is lock the dizzy shaft then connect the sensor in the bottom of my distributor (picture following) to the MS and then output timed firing pulse information to the MSD. This hook-up doesn't seem to be covered in any of the literature.

Thanks in advance.

Dene

FoundSoul · Post by **FoundSoul** » Mon Jul 17, 2006 6:24 am

I think this page will cover your setup pretty well--

http://megasquirt.sourceforge.net/extra/setup-msns.html

Hope this helps!

DeneOehme · Post by **DeneOehme** » Mon Jul 17, 2006 11:47 pm

OK but for MSD it only shows details for the V3 board.

Mine is V2.2 so is there an equivelant connection for the 2.2.

See following recomended internal V3 modification...

turbo355 · Post by **turbo355** » Tue Jul 18, 2006 2:33 am

http://www.msefi.com/viewtopic.php?t=16365
try this mine is hooked up like this

FoundSoul · Post by **FoundSoul** » Tue Jul 18, 2006 9:18 am

DeneOehme wrote:OK but for MSD it only shows details for the V3 board.

Mine is V2.2 so is there an equivelant connection for the 2.2.

See following recomended internal V3 modification...

The same leg (closest to DB9) of D14/17 (D17 on the v2.2 board) over to any available output pin on the DB37. For example X11 would bring the ignition signal out on pin 25.

DeneOehme · Post by **DeneOehme** » Tue Jul 18, 2006 6:14 pm

Do I need to do these mods.....

"led 17 to fire the msd i removed d8 put a jumper in and put a jumper in xg1 xg2 and left r10"

or for my standard V2.2 board do I just jumper from the -ve of D17 to an output pin and that's it?

Thanks for your help.

Dene

elturbonitroso · Post by **elturbonitroso** » Wed Jul 19, 2006 1:04 pm

all you have to do is just fit a wire form - side of led 17 to any of the free output exit on the board let said x11 and a wire from that output to the white of the msd but if you have a vr sensor in your distributor you have to condition the signal using a 4 or 7 pin module to pin 24.let me know if you need the 4 pin module i hav one laid around that i could saled to you cheap.

DeneOehme · Post by **DeneOehme** » Wed Jul 19, 2006 7:54 pm

I'm ok for the module. Thanks for clearing that up for me. Ignition control on it's way.....

Dene

DeneOehme · Post by **DeneOehme** » Tue Jul 25, 2006 5:18 pm

Thanks for the tips. All working to a point.

I can get it to run using the above methods but the signal output from the MS is erratic in it's timing. After the initial setups, I've set the timing map to all zeros and still the timing bounces around all over the place within a 20 degree range.

Also the tach signal now fluctuates by up to 1000rpm causing odd fuelling as you would expect. In fact it may be this tach fluctuation that is causing the timing problem as well.

With the tach signal feeding the MS from the VR conditioner and the white wire from the MSD to the MS disconnected, the tach signal is rock solid. As soon as I connect the white wire, whether spark control is turned on in the MS or not, the tach signal goes nuts.

Thoughts?

Thanks in advance.

Dene