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Wiring and Electrics Questions, answers and posts pertaining to electrical mods and problems

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Old 05-26-2013, 02:25 AM   #1
olekat
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Default 89 750 megasquirt

Whats up people. What we have here is an 89 Kat 750. Im going fuel injected on this thing, because my carbs were gummed up pretty bad and I though "why not?". I have been using the thread that "The Steve" started to navigate my way through this. I will be using the megasquirt for fuel and spark, and maybe other stuff in the future.

I have been at this for quite some time working on this during breaks from school. I swapped in a gsxr 1000 swing arm, wheel and rear suspension. I am currently working on the efi. the throttle bodies are from a 2002 gsxr 600 and the gauges are cheap ebay junk.

Today I have been trying to finish the wiring for the MS and the gauges, I should be done tonight, and tomorrow I am going to run the fuel lines and try to start this thing.

The only thing I am concerned about is the ignition timing. What does suzuki run for total timing advance? what kind of curve? I know that there is a Dana ignition box available what do those guys run for timing? I plan on running around 35* of total advance at a the upper rpm range.

I would love input, questions, comments on timing or anything else that you may think that needs to be addressed.
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Old 05-26-2013, 01:19 PM   #2
ygolohcysp
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I'm impressed with your ability to get anything done on that bike. You look so small in that 2nd pic!



Seriously though, I'm sure people will be asking about that swingarm and rear suspension swap.

I have not tried a dyna ignition, so I don't know what they run. Unfortunately, I'm not sure anyone will be able to tell you what the full advance is, unless they've used a Dyna ignition. All that happens in the CDI normally, and no one really knows exactly what it does. Well, I mean, we know what functions it does. But it's a total black box kind of thing. What I do know is that with a full exhaust, gsxr cams, K&N filter, and a LOT of carb tuning, I had to take out my 5* advancer, and modify the pick-up plate to give me adjustable timing. I believe I'm around 2* advanced from stock instead of 5* now.

I'm not really a street fighter kind of guy, but I certainly respect all the work you're doing to this thing! Keep letting us know the progress!
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Old 05-26-2013, 03:08 PM   #3
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Timing is not adjustable in the right sense of the word.

You can advance the plate, but its similar to rotating the distributor cap so I wouldn't call that "adjustable"
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but personaly I dont see a point in a 1000 you can get the same power from a properly tuned 600 with less weight and better handeling.
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Old 05-26-2013, 04:48 PM   #4
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Nice job on the swinger, looks good man. I'll be following this thread to see how the FI conversion turns out. Seems all who try it on a kat disappear from the forums before finishing. Good luck man, keep us posted
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Old 05-27-2013, 04:12 AM   #5
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Ok so I've got the wiring connected, its not finished but its there. I've got spark while cranking. Tonight I put the fuel system in place and burned a basic configuration into the megasquirt unit, tomorrow I add fuel. The only thing im concerned about is the ignition timing. I am using a vr circuit for the ms1 v2.2 lm1815 and it kinda sound like it is hit and miss with this circuit. for some it runs good for others it has many problems user error could be a factor.

@ygoloh haha yeah thats my son he likes to help but he wont be riding anytime soon.

@krak yeah i got kind of carried away on the body I didnt plan to swap the swing arm but it was already apart so I went ahead and started cutting away, the front needs to come down a little but ill save that for later.

thanks for the kind words, ill add fuel tomorrow and well see how close this timing is.
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Old 05-27-2013, 10:42 AM   #6
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I had some timing specs somewhere. I think it's like 15*BTDC below 1500 rpms. Not sure on the total but ill look at what I found out. I'm running my modded backing plate at -3* as in running 4.5lbs of boost with no inter cooler. But I did have it at +4* when I hade full exhaust and FP stage 1 jet kit.

Gotta ask how much u got in the mega squirt and throttle bodies and stuff?
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Old 05-27-2013, 12:46 PM   #7
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I bought most of this stuff last summer, but if I can remember right i paid around 170 for the MS, 70 for the throttle bodies, and nearly 100 for the needed sensors, wiring and tuning cable. oh your going to a fuel pump and regulator stuff like that. The total cost depends what parts you get and where you get them from. If i had planned to control timing with the MS I would have gotten the 3.0 board. I'm in less than $500 for the fuel injection setup.
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Old 05-27-2013, 05:31 PM   #8
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Quote:
Originally Posted by olekat View Post
I bought most of this stuff last summer, but if I can remember right i paid around 170 for the MS, 70 for the throttle bodies, and nearly 100 for the needed sensors, wiring and tuning cable. oh your going to a fuel pump and regulator stuff like that. The total cost depends what parts you get and where you get them from. If i had planned to control timing with the MS I would have gotten the 3.0 board. I'm in less than $500 for the fuel injection setup.
That's not that bad but u have to assemble the MS tho. I already have the fuel injection pump and bypass efi regulator on my turbo setup. I was just wondering wat the MS goes for.
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Old 05-28-2013, 01:15 AM   #9
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Today I went to start this thing up and it was sitting at 50 psi fuel pressure, ok thats not so bad. when I started cranking the thing over the sound changed and the cranking slowed. I thought that was strange so I started looking around, the battery voltage was good, the connections were tight then I looked into the throttle bodies and I saw fuel pooled near the throttle plates. when I opened the throttle plates the runners were full of fuel so I cycled the ignition switch again to energize the fuel pump and while the fuel system was pressurized the injectors were dumping fuel. After a quick look at the trouble shooting section of the megasquirt assembly guide I checked the resistors on the mother board and they are in the correct orientation. Next I did a quick search of the symptoms and came to the conclusion that i may have fried the fuel injector driver. While I was working on the brake/tail light wiring I left some of the wires exposed (bad man) I thought to myself "ill fix that when I get the engine running" WRONG! Anyway the power wire touched the ground and blew a fuse I didnt think much of it, I wrapped it in tape for a temporary fix then the the same thing happened when I was wiring in the gauges blew another fuse.
when I went to order another driver I was told that the part has been discontinued. haha just my luck. Well it took all day but I found one that will work but it looks like Im going to be delayed about a week. I guess its ok it gives me time to get some things painted.
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Old 05-29-2013, 10:08 PM   #10
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damn man that sucks. I checked my info and its 13* BTDC below 1500rpms. I have no idea what the total timing is.
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