ok i feel like a idiot. i have been going crazy trying to find this all day. i know this is possible as i know a few people around the state doing it. to just run one msd box on the trailing an run it to the leading plug holes deleting the leadin coil. but my biggest thing is how do you wire the 6al to the stock wiring as there is two coils on the trailing box. please anyone let me know thank you.

 

wait.. what?

 

yeah you remove the leading coil and only have the trailing. then you run the msd to the trailing an insted of running the trailing wire to the leading plugs. so there are two plugs not in use. then run a higher number plug like a 10 thet said to run bgev10s i think is what it said. i have found some info on first gens just nothing on the second gen. my friend has a third gen with this set up an it runs low 11s high tens. i mean i know everything pretty much to do it just not the wiring

 

Uh. Bottom line, you don't want to delete plugs. Some people actually go out of their way with measurements to add a 3rd one.

Do some more research about it, your probably refering to deleting the single coil so you can use a MSD set for the leading and the stock individual coils for the trailing (a wasted spark setup).

You can't just delete a spark plug. It doesn't work.

"Here's how it works. All you need is an MSD 6A, and an extra coil. Two for the leading, and one for the trailing. Trigger the MSD with the magnetic trigger inside of the distributor.Do not try to trigger the MSD with the ignitor! The ignitor output is very "dirty", and does not give the MSD a clean signal to work with. Simply cut the green, and red wires that go from the leading magnetic trigger to the ignitor. The leading ignitor is the one facing the front of the vehicle. Connect the green wire from the trigger, to the purple wire of the MSD, and connect the red wire from the trigger, to the green wire of the MSD. Wire power, ground, and ignition as per MSD's instructions. The orange, and black 16ga. wires from the MSD go to the coil. In this case, make two jumpers and connect both coils to these wires. Make sure that the polarity is correct. The stock coils are labeled positive and negative. The orange wire goes to positive, the black wire goes to negative. Do not screw this up! The same goes for the magnetic trigger in the distributor. If you wire the trigger backwards, the timing will be advanced by approximately thirty degrees. Now simply run a plug wire from each coil to a leading spark plug. It doesn't matter which one, because they will both fire at the same time. Leave the trailing ignition just as it is."

The above was quoted from the Yaw Power website about a DLIDFIS (Dual Leading Ignitor Direct Fire Ignition System).

 

So... Why exactly do you want to delete a set of plugs?

 

heres the link i found to only use two plugs http://www.smbaker.com/wordpress/san...-rotary-engine
i know its possible to cause my buddy mike has it on his fd. you only use the trailing coil. No leading so you would only use the two plug wires from the trailing to leading plugs an nothing get pluged on the trailing plugs. why am i trying to get rid of one coil so i can run a msd with two step an a rev limiter. without spending 500 600 bucks on a dis or a full ignition system.

i already have a ms1 so i can do a rev limiter but then i have to soider a resistor in an set it up. then i would have to do all this crap to run a wire on the ms1 to a pin on the harness. then to change it you have to have your laptop. I find it much easier to just change a rpm module then plug the computer in open up mega tune an go threw all that.

 

you have a standalone already?

 

yeah i do i just havnt had a chance to get it in its ready an stuff. i know it works its just my battery in my car was two low so it would loose the connection to the laptop. if that makes sence

 

well now that i look at that pic more he is still running the leading off his dizzy. an the two to the msd coils off the msd. but i know you can only run one coil i have seen it done an runnin just fine

 

I would not eliminate the coils, when I see more people do it who know what they are doing maybe I will change my mind.

If your whole point is to use the rev limiter wait until you get your tune, most standalones have built in rev limiters.

 

Um mate I think you have it back to front.

you can use just the leadings (and have blanks for the trailing) But you cant do it the other way round. (have you even looked at the trailing spark hole in the housing !!)

Trailing's are really just for emmisions, they only make up 5-10% of the power generated.

 

yeah ive rebuilt alot of motors an i know the trailing is a just a really tiny hole. The leading is about the size of a dime. i know it works cause i just took my trailing coil unplugged it. Took the leading the ones that have the msd on it now an left them there started the car an it ran great. but what i want is to use the stronger trailing coil to run the leading plugs if that makes sense.

 

well ill beleive the guy in town who makes 500hp on two plugs if you dont belive me look up mike b fd. with one msd. didnt mean to sound like a dick but i just found out it runs to by unplugging my trailing coil an only running my leading that has the msd on it. im just trying to use the trailing coil as its a stronger coil that the leading

 

ok so i just got off the phone with bdc an he said it is possible but you loose a little power. i drove it around an i did realize a little power loss but nothin tomuch that i cant drive. but my biggest thing is i wann run a two step or a sort of launch control. but if i only run the two step off one coil its just pointless. why becuse the trail is still sparking even when the leading is being cut. thats kind one reason i wanna do this. i can live with out a msd but i just want a two step for when im at the trackor atleast some sort of launch control. is there anything i can do.

 

nevermind found it you keep both the coils but you run a relay to shut the trailing off under two step. this causes it to shut off when the two step is active then as soon as the relay closes again it turns the trailing coil back on.

 

um... dude... hes using all 4 plugs. he is just switching to direct fire. adding in another coil and triggering that coil to fire along with the 2nd coil straight to the leading plugs. one coil for each plug, then using the 3rd coil to fire both trailing. you did not fully understand or comprehend this modification. we already have direct fire. also if you are running a stand alone ecu, you dont need to wire in relays or anything, it has anti lag built in.

 

yeah if you read at reply #9 an see what i said i already said that. i already have it figured out anyway so i dont much mind. an theres no built in anti lag in megasquirt unless you soider a resistor into the board run a dual lm1518 to run the stock cas an then you have to wire that into the ms an then on top of that you have to set it up on the mega tune. to me its just easier to run a relay an shut it off well its under two step then turns back on when i launch.

also yea i did understand it i already know you can run the car on only two plugs i have been driving mine like that for the past few days an so has my buddy for the past two years. already talked to a few people about it theres nothing wrong with it as long as you have the right plugs an a stong enought spark. its a completly different mod than the link i posted. i just seen it an didnt much read it. cause it was for a dizzy motor not one with a cas.

 

my old friend once told me, "trailing plugs are like that much needed cigarette after sex"

 

HAHAHA yeah i founf a way to get past it to be able to run a two step. so i will have my leading an trailing then my trailing will shut off under two step an start working as soon an i let go of the switch

 

Perfect solution.

B

 

yeah mike told me to look at one of his old post. sorry about the other day i dont know if it was my phone or your phone that hung up. but ill give you a call a little later when its done.

 

now that i got it figured out ill do a write up on it if anyone is interested in do it.