Shoptalkforums.com

For Your Air Cooled Pleasure!
It is currently Fri Oct 31, 2014 5:43 pm

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 9 posts ] 
Author Message
 Post subject: Notes on EDIS--Megajolt install
PostPosted: Wed Apr 04, 2012 10:21 am 
Offline
User avatar

Joined: Sat Jun 22, 2002 2:01 am
Posts: 939
Location: Houston, TX
Hopefully this will help others get set up with EDIS on an air-cooled VW. A lot of the information out there is scattered, old, or just not there. I'll try to put a lot of this in one place to save some time and energy. The assumption here is you are doing an ignition-only setup with carb(s) using Megajolt or Megasquirt (with the intention of going to fuel injection later--a lot the below information still applies). This first portion involves initial setup. Plugging in, operation, and tuning are further below in the thread.

Parts Needed

-EDIS 4 module, connector, and about 4-6 inches of the connector wiring from a junkyard Ford or can be bought new (found on Escorts and other 4 cylinder Fords, Mazdas, etc.--the module is pictured below and more information below)
-EDIS coilpack, capacitor that comes with it, connector and a few inches of the wiring (more notes on coilpacks below)
-Plug wires (this depends on where you will mount the coilpack, note that V6 EDIS wires are a bit longer than 4 cylinder cars)
-VR sensor, connector and a few inches of wiring, and bracket (there are several choices for the type of sensor depending upon where you will mount the sensor as well as the bracket you will either have to fabricate yourself or get an aftermarket one here, or here,or here
-36-1 trigger wheel (again, several choices here either using one off a Ford and mounting to your crank pulley by a machine shop or mounting it yourself, or aftermarket unit here or here.)

Image

Getting started

Consider where you will mount everything and how. The EDIS module and coilpack can be mounted in the engine compartment area, but it is not adviseable to put the megajolt (MJ) unit in the engine area because chances of getting it wet or being contaminated with oil vapors the engine gives off, unless you have the unit fully enclosed. Make sure to enclose your wires on your install, but especially the SAW, PIP, and VR sensor wires need to be shielded and grounded to the number 7 wire on the EDIS module to minimize noise picked up in the system. You can mount the coilpack in the same location as where the stock coil was and the Ford 4-cylinder plug wires will just reach (see attached photo below), but note the plug ends may be different depending upon which route you go, more below. You can also mount the coilpack on firewall, but may need to get longer wires.

Overview and Install

A good example of the methodology here. This is very similar tos mounting on a VW. Note the firing order for a Ford is 1-3-4-2 and VW is 1-4-3-2, be sure to install your spark plug wires for cylinders 3 and 4 reversed on the coilpack. Also note, if you plan on hard wiring the all the connections, at least have the 10 and 12 wires to the EDIS module and coilpack with quick connections so they can be interchanged if need be. Ford has the 10 and 12 wires reversed to the coilpack vs. what Megajolt/Megasquirt shows how to hook them up, but this is easy to check which way is correct for your coilpack you have mounted. Start up the car in limp-home mode (just the module, coilpack, and VR sensor powered up) and if you hear backfiring in the intake just switch the two 10 and 12 wires and it should start up fine. Other installs here and here, and here, Megajolt specific wiring hookup and general setup here.

Distributor plug hole notes

If you plan on pulling the old distributor out and setting with a plug you will also need to pull the drive gear and shims. Do not leave the gear or shims in place and just plug the hole, you will chew the gear up and it will wind up in the sump. If you are running a stock mechanical fuel pump with the pushrod, you will also need to remove this and go with an electric fuel pump as the pushrod is lubricated by the distributor drive gear. More on how to remove the drive gear and shims here. There a few different types of plugs on the market, one is a straightforward machined plug, another accepts the newer style flat-back coilpacks and plug for a mounting point to put the coilpack where the distributor was, or additionally you could just cut an old distributor and use that as a plug.

Spark plug ends

VWs originally (along with a lot of other older cars) were equipped with a threaded spark plug end that accepts a spark plug wire with a small clip (you can hear the clip running over the threads as you install/remove the plug end). Most spark plug manufacturers, as well as car manufacturers have moved away from this plug end and gone with a cap that fits over the threading (on many newer type plugs this cap is not even removeable any longer). Be aware of this when you're doing the EDIS swap that unless you have a set of four of these caps to fit over your stock plug ends, you will have to buy a new set of plugs as they do not sell these caps separately.

VR Sensor and Trigger Wheel Mounting

You will need some adjustability with your mounting bracket to get the VR sensor the correct distance. Check your trigger wheel for runout, you can eyeball it and see if it is off center by looking at the edge of the teeth as the engine rotates and see if they get closer or further away with each rotation of the crank. Ideally you will want the VR sensor 0.75mm away from the trigger wheel, you will know pretty quick if you are getting a signal when you plug into the MJ unit--if there are no RPMs displayed then try moving the VR sensor a little closer. Also note the polarity of the VR sensor below when you are running the wires to the module. You may need to leave some adjustability of the sensor to be moved left or right to be centered over the teeth as well. Where you mount the VR sensor and bracket with reference to TDC of cylinders 1 or 3 doesn't matter as long as the reference of 90 degrees after the missing tooth is followed. Usually the best place to mount the sensor on an upright type 1 is the inside area of the v-belt (generator/alternator stand area) for ease of mounting points to use and keeping the sensor and bracket out of harm's way if the belt should break. Examples of VR sensor installs/mockups above in the 'Overview and Install' section links.

Image

Coilpack options and mounting

If you use the original Ford type coilpack there should be some space in the area behind the coils (don't mount them flush). You can use the original bracket the coilpack came with or spacers on the shafts of the mounting bolts to put some distance behind the coilpack. MSD ignition makes an aftermarket replacement version of the Ford style coilpack you can find from most automotive stores or hot rod parts places such as Summit Racing. There is also a newer type of coilpack sold that does have a flat bottom and accepts straight spark plug wire ends instead of the clip on style that come with the Ford coilpacks. This flat bottom style pack also works with Miller's distributor hole plug (described above) to mount in the same location as where the stock distributor normally sits on a VW engine.


You do not have the required permissions to view the files attached to this post.


Last edited by Jadewombat on Fri May 18, 2012 1:54 pm, edited 34 times in total.

Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Wed Apr 04, 2012 1:01 pm 
Offline

Joined: Sun Apr 27, 2008 5:36 pm
Posts: 3806
Location: Norfolk, VA
Here, I did your work for you a couple years ago: http://www.capitalcitycorvairs.com/the- ... pe/7-d-i-s

_________________
Image


Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Wed Apr 04, 2012 2:58 pm 
Offline
User avatar

Joined: Sat Jun 22, 2002 2:01 am
Posts: 939
Location: Houston, TX
Communication with the unit

This is a critical portion of being able to set up the system and can be troublesome. Be aware that Megajolt uses an RJ11 (phone jack head) connection to communicate with your computer. Most aftermarket programmable systems such as Megajolt and Megasquirt do not support a direct USB connection (as the cost of the unit would go up considerably if they did support USB drivers). Most older computers had a 9 pin connection port for communication, but most modern computers do not have this--instead they use a USB connection. You will need to get a decent USB to 9 pin converter and plan on spending at least $15-25 or more for this cable. Once you have loaded the drivers on your computer for the USB converter and have established a good connection, you will need to then use a RJ11 to 9 pin converter. Even though the RJ11 is a phone-type jack, a phone system only uses the two middle pins/wires, the MJ RJ11 uses a data cable with four wires though. Do not use one of those universal USB, everything-in-one cable kits to try to communicate with the MJ--it will not work. Help with communication USB problems here and here and here.

Operation and Tuning

You will need to download the MJ tuning software first. Basic operation and interface with the MJ unit here. Your MJ should come with a basic tuning map flashed to it already, if it doesn't you can flash a basic one. If you are running a N/A (naturally aspirated) motor your draw of map kpa will be in the range of 0-100 (no more than ~110 or so though). If your motor is boosted (turbo or supercharged) your map kpa will be much larger range of 0-250. VW specific collection of MAPs can be found here and here.

And in case you're really interested, background and theory of how EDIS works

Found here


Last edited by Jadewombat on Wed May 02, 2012 3:24 pm, edited 3 times in total.

Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Wed Apr 04, 2012 3:25 pm 
Offline

Joined: Sun Apr 27, 2008 5:36 pm
Posts: 3806
Location: Norfolk, VA
Use the info you need to, modify it any way you want and repost it. Mine is meant as a general guide, I first did the conversion to a Corvair, but it's roughly the same on any engine.

_________________
Image


Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Thu Apr 05, 2012 5:49 am 
Offline

Joined: Wed Apr 13, 2011 3:01 pm
Posts: 1056
this is what i'm planning to do.... exactly, thank you!!


Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Mon Apr 09, 2012 4:01 pm 
Offline

Joined: Wed Apr 13, 2011 3:01 pm
Posts: 1056
just won my edis4, coil, vr sensor off ebay for £30 which wasnt bad, given i'd pay £20 in fuel to get to my nearest scrappy!


Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Wed Apr 25, 2012 4:23 pm 
Offline

Joined: Wed Apr 13, 2011 3:01 pm
Posts: 1056
http://xpower.blogs.sapo.pt/20025.html

so it that it, those two jumpers and a resister and all is good ?

seen the diagrams but pictures are so much easier!!


Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Thu Apr 26, 2012 12:29 am 
Offline

Joined: Sun Apr 27, 2008 5:36 pm
Posts: 3806
Location: Norfolk, VA
Pretty much, that's why EDIS is such an easy ignition mod to do.

_________________
Image


Top
 Profile  
 
 Post subject: Re: Notes on EDIS--Megajolt install
PostPosted: Thu Apr 26, 2012 1:55 am 
Offline

Joined: Wed Apr 13, 2011 3:01 pm
Posts: 1056
Indeed!! Even I could do that ;) I've setup my settings so once I've done those 3 mods and setup the ignition curve I should be good to go? Ie there's nothing on the other side of the board?

Thank you!


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group