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Thread: Megajolt conversion

  1. #1
    LXi User InAccordance's Avatar
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    Megajolt conversion

    This will be my Megajolt install and update thread.

    Got parts ordered and on the way.
    Picked up an EDIS-4 module (Off a Ford Scorpio)
    Crank sensor and pigtail from rockauto (new)
    Trigger wheel
    6-port vacuum log mainfold (Going to tap each runner for MAP sensor configuration)
    Megajolt/E MK2 control unit
    Various gauge wiring

    Should be fun once everything gets here and I can start playing.
    If anyone happens to have a timing map, that would be super useful =P
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.



  2. #2

    Dr_Snooz's Avatar
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    Re: Megajolt conversion

    This is very cool! I can't wait to see how you mount that trigger wheel.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


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  3. #3
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    I found a crank pulley at a local junkyard so going to pick that up. My thought is to have the a/c belt part machined off and that would give me plenty of room to mount it. Probably welded on.
    Last edited by InAccordance; 03-02-2019 at 02:01 PM.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  4. #4
    SEi User Hauntd ca3's Avatar
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    Re: Megajolt conversion

    Will the mega jolt not accept reluctor inputs ?
    That way you could just use the factory distributor for crank position

  5. #5
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Nah, uses a 36-1 trigger wheel with a VR crank sensor to determine crank position. Also uses either MAP or TPS sensor (I'm going with the MAP sensor) to determine engine load.
    The idea is to remove the distributor altogether and have a completely electronic and programmable ignition.
    Do need to figure out a blanking plug..
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  6. #6
    SEi User Hauntd ca3's Avatar
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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    Nah, uses a 36-1 trigger wheel with a VR crank sensor to determine crank position. Also uses either MAP or TPS sensor (I'm going with the MAP sensor) to determine engine load.
    The idea is to remove the distributor altogether and have a completely electronic and programmable ignition.
    Do need to figure out a blanking plug..
    For all the shagging around , wouldnt going standalone be an idea

  7. #7
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    For sure but this route is cheaper and I'm carbed.
    Pretty much is a standalone but only for the ignition. I'm running twin DCOEs so my fuel is covered.
    Last edited by InAccordance; 03-05-2019 at 07:21 PM.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  8. #8

    Dr_Snooz's Avatar
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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    Do need to figure out a blanking plug..
    LOL. Probably the easiest part of the project. What, some flat stock, a centering punch and a drill, right?

    The trigger wheel is the bugaboo for me. I'm unwilling to give up AC.
    Last edited by Dr_Snooz; 03-05-2019 at 09:18 PM.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


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  9. #9
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    I did have the thought of welding it to the end of the pulley up against the power steering belt but downside is bracket to hold the sensor would have to be ridiculous to not vibrate all crazy
    I'll know more once I go pick up the pulley from the yard and play around with fitment options.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  10. #10

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    Re: Megajolt conversion

    You're right about the bracket, it needs to be beefy. This is what I ended up with. I was really surprised how much vibration there was with thinner metals, but this was solid.
    -xmeaimm-jpg

    Here's my first trigger wheel. I found a crank pulley from a 77 Accord, that had no AC or PS on it, which also happened to be the exact same diameter as the Escort trigger wheel.
    -ipmt9lo-jpg

    It worked pretty well for a while, but the bolts kept wanting to back out, and I was worried about heat distorting the nylon spacers. I may have been able to come up with other ways to make this work, but I wanted the MJ hooked up and got tired of messing with it...

    I took the stock pulley to a machine shop, and he machined off the power steering pulley, and built a spacer to mount the trigger wheel on. This setup has been 100% solid, and is still on the car now.
    -bgx1aet-jpg


    The stock map in the MJ will run your car just fine. It's fairly conservative, and definitely safe for the street, so you will really want to play with it for peak power. But once everything is wired up, you can pretty much start up your car and drive it immediately. Also, if you have the whole EDIS system wired up, your car will run without the Megajolt just fine. The EDIS system will go into failsafe mode without the MJ, and give you a fixed 10 degrees of advance. It's good for troubleshooting and testing.

    My favorite part about getting this setup running, was when I was setting the initial idle timing. Sitting in the garage and hearing the cars engine sound change and smooth out as I pressed buttons on the keyboard was so cool. Your engine will run so much smoother and start so much easier with this setup.
    Last edited by 2ndGenGuy; 03-07-2019 at 02:15 PM.

  11. #11
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    cool cool, thanks for the feedback.
    I was worried about having to initially tune it or put a base map in and/or having to set firing order and things like that. Good to know it'll run out of the box though.
    I want to keep the power steering on mine so machining that off isn't an option so was leaning towards taking the a/c pulley off and going there.
    Assuming you used the a/c bracket mounting points to bolt your new one on?
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  12. #12
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    MJ box came in today but I wasn't home to sign for it. DOH!
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  13. #13

    Dr_Snooz's Avatar
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    Re: Megajolt conversion

    I did see some YouTube guys rig up a crank trigger mechanism on the cam pulley. That was pretty awesome.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


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  14. #14
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    I wonder how that would work. Doesn't the cam rotate at half the speed of the crank?
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  15. #15

    Dr_Snooz's Avatar
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    Re: Megajolt conversion

    It was a single magnet as I recall, not a trigger wheel. It was a quick and dirty setup, but it worked.
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


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  16. #16

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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    cool cool, thanks for the feedback.
    I was worried about having to initially tune it or put a base map in and/or having to set firing order and things like that. Good to know it'll run out of the box though.
    I want to keep the power steering on mine so machining that off isn't an option so was leaning towards taking the a/c pulley off and going there.
    Assuming you used the a/c bracket mounting points to bolt your new one on?
    This actually went on my 1st gen. There are a couple of bosses on the back of the block right above the oil pan... there were never any accessories mounted there, but I think it's where the 1g Prelude mounts bolt onto the engine.

    Firing order will be the same. It's wasted spark, so 2 cylinders fire at once. Supposedly there's a way to set the EDIS module into firing twice at low RPM (aka MSD). Haven't played with that part yet.

    I think you should try to find Cygnus's post on MegaJolt, I can't remember if it was here or on PreludePower, but he did a nice writeup with pics, showing how he did his trigger wheel, and bracket for the sensor. In fact, I think he was selling an adjustable A20 bracket, but not sure if he has any hanging out still...

  17. #17
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    I have his post saved =P
    I'm going tomorrow to a machine shop that a guy who runs a local car club referred me to (ye olde hillbilly discount) and see what he can do with the pulley and trigger wheel I have. By the looks of it, I can cut off the a/c belt lip and shave down the power steering part about 1/16th of an inch and the wheel I have will slide right on. Drill a few holes and bolt it on.
    I'm making it difficult because I want to keep the PS. If I wasn't, this thing would be super simple.
    On the plus side, all my parts are in so just need to get the pulley squared away.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  18. #18
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Pulley at shop, should have it back in a few days. Explained to 'em how I wanted it done and they said no problem.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  19. #19

    Dr_Snooz's Avatar
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    Re: Megajolt conversion

    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


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  20. #20
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    So from what I can tell, the missing tooth should be mounted exactly at TDC correct?
    As the pulley itself doesn't have timing marks, reading other threads and searching other sites, the keyway is TDC and should face 12o'clock when engine is at TDC. So the wheel should be mounted with the missing tooth in line with the keyway or am I wrong?
    I got the pulley back from the machine shop cut down the way I wanted but I have to do final mounting position.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  21. #21
    2.0Si User
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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    So from what I can tell, the missing tooth should be mounted exactly at TDC correct?
    As the pulley itself doesn't have timing marks, reading other threads and searching other sites, the keyway is TDC and should face 12o'clock when engine is at TDC. So the wheel should be mounted with the missing tooth in line with the keyway or am I wrong?
    I got the pulley back from the machine shop cut down the way I wanted but I have to do final mounting position.
    Search around some pictures because I don't think the crank keyway will be at 12 o clock at TDC.
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  22. #22
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Last post in this thread says it is. I honestly dont know which I get conflicting info on =P
    https://www.3geez.com/forum/3geez-ac...nk-pulley.html
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  23. #23
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion




    Pulley cut down with wheel sitting on it. Not set in place yet but that is where it will go.
    Last edited by InAccordance; 03-29-2019 at 06:18 PM.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  24. #24

    Dr_Snooz's Avatar
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    Re: Megajolt conversion

    Oooooo, sexy!
    Dr_Snooz

    "I like to take hammers, and just break stuff, just break stuff." - Beavis


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  25. #25
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    -20190403_185119-jpg

    oooff, it's sideways but Imgur is being annoying. FINALLY got that fraking crank pulley off.
    Had to use the 'ol chain wrapped around the engine mount technique. Put so much torque on it the chain broke a chunk off the old pulley lol.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

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