ignition only question ?, mcmark crank position sensor Options

[jimkelly]

for ignition only (using carbs) - what is needed?
*** this is a cross post - oops***

i assume ford coil pack and edis module - is a tps needed as yarin uses?

http://www.flickr.com/photos/infinitelydig...57594124768996/

http://www.autosportlabs.net/Megajolt_Lite_Jr.

http://www.914world.com/bbs2/index.php?sho...=97550&st=0

http://www.boostengineering.net/PhotoGalle...DISMJLJKITblack

associated link>>
http://www.914world.com/bbs2/index.php?sho...6244&st=100

jim

http://www.shoptalkforums.com/viewtopic.ph...;highlight=edis

http://www.autosportlabs.net/Ford_EDIS_technical_information

http://autos.groups.yahoo.com/group/megajolt/

http://www.autosportlabs.net/MJLJ_V4_vehic...tallation_guide

pics, drawings, pns would be extra special : ))

[underthetire]

Well, can't answer on the megajolt, I use Megasquirt. What I do know about the MS system is it will read the map sensor to either advance or retard the timing based on load and rpm.

Just my .02

And yes you can use the MS2V3.0 for timing only.

[Mark Henry]

The Ford EDIS is the "bolt on"simple basic install with both systems but you can mod almost any 12V coilpack to work.

[jimkelly]

is it my choice to use either a throttle pos sensor - or a - manifold press sensor - or are both typically needed?

[McMark]

The Ford EDIS ignition module is designed to work with a 36 tooth wheel, with 1 missing tooth to act as a synchronization reference for engine Top Dead Center.

Which means my sensor works great for this.

Relying on Jake's experience with the Mechanical Advance ONLY Mallorys, I would say that you probably won't need any load sensing. Just approximate the Mallory curve into the MegaJ software and it should act like you've got a Mallory installed.

If you want to use load sensing, I would opt for vacuum based sensing. The TPS is more work to install and is a rather indirect way to approximate load.

[jimkelly]

thanks

i see that the megajolt offers both tps or mps input.

http://www.boostengineering.net/product_p/megajoltli.htm

jim

[McMark]

TPS hookup is just a wiring hook up and appears to be included in all the setups. The MAP sensor is an additional component that can be left off the circuit board at build time, to save a few bucks.

Using MAP or TPS is a software configurable option, so if you get the MAP version of the hardware box you have an unrestricted box whether you use the sensors or not. I would spend the extra $20 for that flexibility, just in case.

That being said, if you're going for non-load sensing, you can get either box and they'll work the same.

[DBCooper]

Get the MAP sensor, unless you have a big cam with huge overlap it's well worth it. Makes the car almost modern to drive.

[McMark]

MAP = vacuum advance

in this case anyway...

[jimkelly]

repost - with edis hooked up to megajolt - are all four spark plugs sparking everytime one plug actually needs spark for combustion?

thanks again!

[Mark Henry]

with edis hooked up to megajolt - are all four spark plugs sparking everytime one plug actually needs spark for combustion?

Wasted spark so 2 would fire at once.
Of course I'm not an MS expert but that's what happens on the SDS where it has one GM coil for every two cylinders.

[McMark]

Sparking all four at once would never run. It's a wasted spark system which means each spark plug fires on the TDC of compression stroke and TDC of exhaust stroke.

[jimkelly]

ok - seems clear to me - vr sensor needs to be mounted 9 teeth from the missing tooth on a 36 tooth trigger wheel, with engine at TDC, in order to use megajolt lite jr and edis.

http://www.autosportlabs.net/MJLJ_V4_vehic...tallation_guide

everyone agree?

does a type 4 turn clockwise or counter clockwise?

jim

[904svo]

You could use Megasquirt for timing only, I use a 36 tooth wheel and a HALL
sensor not a VR sensor. This connects directly to the Megasquirt and has a
12x12 table to set your timing. the kit also includes a map sensor which is used
with the timing table. At a later date you can convert to FI if you wish.