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Thread: Megajolt conversion

  1. #101
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    It did great, I was a little hard of hearing for a few hours after running this loud ass thing for 15 hours straight lmao.
    I nailed a dip in the road in Knoxville that may have fucked a tie rod. You probably know it, was around exit 380 something. Bottomed the car out. Been tracking to the right ever since.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.



  2. #102


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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    It did great, I was a little hard of hearing for a few hours after running this loud ass thing for 15 hours straight lmao.
    I nailed a dip in the road in Knoxville that may have fucked a tie rod. You probably know it, was around exit 380 something. Bottomed the car out. Been tracking to the right ever since.
    The double bump right in the downtown area...I smash my Camaro off them everyday on the way home
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

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  3. #103
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    It's on i40, probably the one though. Those hurt.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  4. #104

    Dr_Snooz's Avatar
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    Re: Megajolt conversion

    Woohoo! Go go go!
    Dr_Snooz

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


    1989 Honda Accord LX-i Coupe, 240k miles, MT swap, rear disc swap

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  5. #105
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    So i realized something and I come to the conclusion that I am quite daft sometimes.
    The reason it wouldn't run right is because I have the trigger wheel 180 degrees off. I put my sensor in the front of the engine, the build I was using as a reference has his sensor on the back of the engine. In his case, the missing tooth will point down. Mine should point up (90 degrees relevant). woops...
    Going to take the pulley off again and have a machine shop cut a keyway into it so all I need to do is spin it 180 degrees and presto magico.
    Did have to order a new sensor cause mine kind of got ran over....
    I may have forgot I had to unbolt it to get the timing belt through and may have left my bracket laying on the lower crossmember. It may have fallen off down the road when test driving the car after putting the new belt on.... then got ran over by another car before I could fetch it from the middle of the road...
    but hey, bracket is perfectly fine, didn't break or get bent.

    Sometimes I can be pretty dumb... lmao.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  6. #106
    LX User Fixedit's Avatar
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    Re: Megajolt conversion

    N’awh dang, man! Well, at least you(‘ll) have your work cut out for you! lol can’t wait to see how it does put back together right

  7. #107
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    So finally got the controller to interface with the laptop I have and have been fiddling around with the timing map the unit came with.
    Anyone have a good base map for this engine or at least numbers to roll with?
    Been looking around on google and autosports website which has files for a bunch of engines but not really anything for this one in particular. Doesn't seem to be a popular engine to convert lol
    This is the base map on the unit:

    rpm-->1k 2k 3k 4k 4.5 5k 5.5 6k 6.5 7k
    v-load
    20-----12 20 25 27 30 32 35 36 36 36
    50-----12 20 25 27 30 32 35 36 36 36
    60-----15 20 25 27 30 32 35 36 36 36
    70-----15 20 25 27 30 32 35 36 36 36
    100----15 20 25 27 28 29 30 33 34 34
    135----12 20 23 23 23 25 25 25 25 25
    160----12 18 20 22 22 23 23 23 24 24
    180----10 15 20 22 22 22 22 22 22 22
    200----10 15 20 22 22 22 22 22 22 22
    230----10 15 20 22 22 22 22 22 22 22
    Last edited by InAccordance; 09-03-2019 at 01:24 PM.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  8. #108
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    hm.. I found a map for an ET2. That's the prelude twin carb engine isnt it?
    Guy says it has dual webbers and a header on it.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  9. #109


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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    So finally got the controller to interface with the laptop I have and have been fiddling around with the timing map the unit came with.
    Anyone have a good base map for this engine or at least numbers to roll with?
    Been looking around on google and autosports website which has files for a bunch of engines but not really anything for this one in particular. Doesn't seem to be a popular engine to convert lol
    This is the base map on the unit:

    rpm-->1k 2k 3k 4k 4.5 5k 5.5 6k 6.5 7k
    v-load
    20-----12 20 25 27 30 32 35 36 36 36
    50-----12 20 25 27 30 32 35 36 36 36
    60-----15 20 25 27 30 32 35 36 36 36
    70-----15 20 25 27 30 32 35 36 36 36
    100----15 20 25 27 28 29 30 33 34 34
    135----12 20 23 23 23 25 25 25 25 25
    160----12 18 20 22 22 23 23 23 24 24
    180----10 15 20 22 22 22 22 22 22 22
    200----10 15 20 22 22 22 22 22 22 22
    230----10 15 20 22 22 22 22 22 22 22
    I always been curious what the time curve looks like too. Shane might have an idea. 36 degrees sounds like alot thats where old domestic V-8 usually run where as modern Hemi and Chevy run less than 20. I never see more than 21 on my LT4 at WOT.
    1988 Lxi owner since August 1995
    336k miles running strong!
    Now running E85.

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  10. #110
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Looks like the ignition map I found is from this guy:
    https://www.3geez.com/forum/classic-...tor-build.html
    His map is even more radical than the base map the unit came with. Says it ran great. He is factoring in a cam and much higher compression ratio though so that may throw a wrench into the mix.

    This is his map:
    rpm---->5 8 1k 1.2 1.6 2k 3k 4k 5k 7.5k
    v-load
    20-----20 18 18 20 29 36 40 42 42 42
    55-----20 18 18 20 29 36 40 40 42 42
    60-----20 18 18 20 29 36 40 40 42 42
    65-----20 18 18 20 27 34 38 38 40 40
    70-----18 16 16 18 25 32 36 37 39 40
    75-----12 15 16 18 24 30 33 36 38 39
    80-----6....9..10 12 19 24 30 35 37 38
    84-----4....7...8..10 12 21 28 33 35 36
    87-----2....5...6..8..10 18 27 33 35 36
    90-----0....3...4...6...9 14 26 32 34 35
    Last edited by InAccordance; 09-04-2019 at 09:17 AM.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  11. #111
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Quote Originally Posted by Oldblueaccord View Post
    I always been curious what the time curve looks like too. Shane might have an idea. 36 degrees sounds like alot thats where old domestic V-8 usually run where as modern Hemi and Chevy run less than 20. I never see more than 21 on my LT4 at WOT.
    From what I've been reading from old posts on here and some google stuff, these engine like a lot of timing in the higher rpms/heavy load range. I've found a map from cygnus that went as high as 44degrees at 5k. I went in a punched his numbers in to a map but did have to remove two lines since his was a 12x12 and MJ is 10x10. I took out 500 and 7.5k. Ran the map as 700, 1k, 1.5k, 2k, 2.5k, 3k, 3.5k, 4k, 5k, 6k. We'll see how it runs off the base map and then my map.

    Monday I'm pulling the pulley and reworking it. All I need to do is cut a keyway into it so I can set it the correct direction. Everything is still wired up so just a matter of getting the pulley right and realigning the new sensor.
    She might just run this week, so exciting!
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  12. #112
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Wheel is reset to the correct position. Ran out of daylight so I'll try to fire it up tomorrow.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  13. #113
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Its alive!
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  14. #114
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Definitely needs some work. Idles good and off throttle is good, has a stumble at 2k that persists throughout the rest of the range so got to figure that out.
    The crank advance was too high and it was spitting on startup but turned the crank adv down and is fine now.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  15. #115


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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    Definitely needs some work. Idles good and off throttle is good, has a stumble at 2k that persists throughout the rest of the range so got to figure that out.
    The crank advance was too high and it was spitting on startup but turned the crank adv down and is fine now.
    Get that baby ready for Cars and Coffee in the fall!

    Harper Auto Square
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    336k miles running strong!
    Now running E85.

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  16. #116
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    8am?! Ewwww lol
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  17. #117
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    SO been tinkering around with it most of the day...
    The 2nd map I posted it was NOT happy with so I reloaded the base map the unit came with and she ran much better. Still some stumbles in certain places though.
    This shit is cool as all hell though. Was getting a stumble at 2k at 50-60kpa vacuum. Added 2 degrees to those two spots and stumble goes away. So cool. Looks like I'm going to have to go through the whole range finding the bad spots and adjust the map accordingly.
    Leaving the distributor hooked up for now since I still have to drive it to work and can just swap two wires around to run off it until I get a good working map figured out.
    Last edited by InAccordance; 09-12-2019 at 04:54 PM.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  18. #118


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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    SO been tinkering around with it most of the day...
    The 2nd map I posted it was NOT happy with so I reloaded the base map the unit came with and she ran much better. Still some stumbles in certain places though.
    This shit is cool as all hell though. Was getting a stumble at 2k at 50-60kpa vacuum. Added 2 degrees to those two spots and stumble goes away. So cool. Looks like I'm going to have to go through the whole range finding the bad spots and adjust the map accordingly.
    Leaving the distributor hooked up for now since I still have to drive it to work and can just swap two wires around to run off it until I get a good working map figured out.
    Another idea is you get lost on timing pull a spark plug and look at the ground strap that will tell you where the timing is.
    1988 Lxi owner since August 1995
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    Now running E85.

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  19. #119
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    You'll have to explain that a little better lol
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  20. #120


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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    You'll have to explain that a little better lol
    https://howto-kuidas.blogspot.com/20...g-reading.html

    I didnt read this all but ...the ground strap tells you where your timing is at. Kinda handy if your lost on your tune up.
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  21. #121
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Ah, well that's neat. Thanks for the tip.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  22. #122


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    Re: Megajolt conversion

    Quote Originally Posted by InAccordance View Post
    Ah, well that's neat. Thanks for the tip.
    Yeah you more or less want it on the "bend" of the ground strap.

    Some of the other readings usually you have to run a car WOT then shut it off and pull the plugs. If you idle around on them it will ruin the reading as far as rich/lean. So thats usually done at a drag track.
    1988 Lxi owner since August 1995
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    Now running E85.

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  23. #123
    LXi User InAccordance's Avatar
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    Re: Megajolt conversion

    Sorry for the lack of updates here but being it's winter and all, cant do much. I'm going to redesign my sensor bracket because I believe I narrowed my issues down to losing signal at the trigger wheel..
    Also going to build a new wheel/crank pulley.
    Originally posted by ShiRen:
    Nice car or not, nobody likes losing a race to an old 4 door Honda.

  24. #124

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    Re: Megajolt conversion

    I have been looking into megajolt recently... I just wanted to drop somewhere that you can use GM 2 post dis coils too, like from a 3800 v6. This will let you run 2 coils instead of 1, less work for them so you can run more aggressive timing settings. Going to a Ford dis coil pack was bothering me because I don't know how it would hold up to my msd box. Tech Wiki - EDIS : Datsun 1200 Club

  25. #125

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    Re: Megajolt conversion

    You can buy the Ford coil packs from MSD directly. I run one with my Megajolt... It's really just 2 coils in one package anyways. I prefer the package over seperate coils. You can run individual coil packs on this setup too, if you want one on each plug. But it will still be wasted spark.

    https://www.amazon.com/dp/B000630380/

    Though there's really nothing wrong with the Ford coil packs.

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