FB II

here's my situation. i have an ignition box coming in the mail, but i would like to give this 2gcdis whatever deal a shot. i could give real comparisons. and i could possibly be a test dummy since i'm running a blow-thru carb setup. currently on the stock ignition i have to run B9ES plugs gapped to .014 to not sputter and get blown out by too much fuel hell even then it still does if i just floor it. i ordered the msd because i need some seroius spark here, do you think the 2gfdstd thing will work in burning my massive amounts of fuel under boost? i have a bunch of spare fc ignition pieces lyin around

Shamrock.James

personally i cannot see how the MSD could possibly be better than a DFIS, MSD shares the load from coils, DFIS connects the coil dirrectly to the sparkplug i question how there could be a more efficient way of doing things??

mwatson184

Alright zac; aside from the coil, wire up the MSD as you normally would. Yank out your stock coil. Gut the ignitor out of a second gen leading coil/ignitor assembly. Wire the MSD to the gutted second gen two post coil. Run direct fire on the leading plugs.

It will pretty much work the same as FC's with a CDI box.

P.S. get the hell on aim I know you're awake....I'm bored as hell at work

-Marques

Jeff20B

iTrader: (13)

You don't need to remove the ignitor from the 2nd gen coil assembly... ever. If you must hook an MSD to it, simply unscrew the nuts at the top of the coil, remove the stock wires and push them aside/tape them up, install the quick disconnect tabs that come with the MSD, and attach the orange and black wires.

Oh, and James, yes, the high voltage low amperage capacitive discharge output of the MSD ends up at an even lower amperage when split into two coils. The MSD's output is finite. It seems to me that a DIS coil designed for the capacitive discharge of an MSD, or similar CDI box, would be better than two seperate coils. It's simple Ohm's law type stuff.

FB II

ok, tomorrow i'm gonna try this 2fcSTD thing out... then when the msd comes........... it's msd2gdfis baby!!!! OH YES!!!! ITS HAPPENING!!!!!!

FB II

seriously tho, i do want to try both and see if there truly is a difference. especially since alot of people are putting turbos on their 12a's. i should have the 2gcdfis on in the morning i hope and i'll know instantly if it's making a difference or not. there's one main flat spot in the power band in 3rd gear i'm hopin to clear up

mwatson184

I didn't think of just moving the wires to the side. I suppose that will do. He could save some weight by removing the ignitors though

-Marques

Hyper4mance2k

iTrader: (40)

no it's not! How can you compair stock equipment to what I run. MSD-DIS is the best system yet... Plus the $150 i paid for my 6a has been well worth it. I bought it in 1996 and it has been in 3 civics, 1 supra, 1 jetta, and 2 Rx-7. I feel it's plenty worth the investment. And the DIS coil is only $35 shipped from summit. You can get a 6a box on e-bay for around $75. well worth the money. Your little 2gdfis doesn't give you multipule spark either. I've got multipule spark and wasted spark...

Hyper4mance2k

iTrader: (40)

no it's not! How can you compair stock equipment to what I run. You know how shitty those diamond coils are. People see great things with just repalcing those things. they're only like 25k volts... MSD-DIS is the best system yet... Plus the $150 i paid for my 6a has been well worth it. I bought it in 1996 and it has been in 3 civics, 1 supra, 1 jetta, and 2 Rx-7. I feel it's plenty worth the investment. And the DIS coil is only $35 shipped from summit. You can get a 6a box on e-bay for around $75. well worth the money. Your little 2gdfis doesn't give you multipule spark either. I've got multipule spark and wasted spark...
Who ever said about $400 bucks for a MSD. must have been a 7 series dis drag only ignition cause a 6albtm is only like $215 and that's the best street MSD box. IMHO limiter and boost timing reatard. leets see you guys get that out of a 2g coil and transister trick.

racintang

Here ya go

Jeff20B

iTrader: (13)

I agree that classic 2GCDFIS perfect. Cheap, but can be improved. I don't think there has been any testing comparisons between 2GCDFIS with the transistor trick and an MSD with a DIS coil designed for a capacitive discharge ignition. Hyper4mance2k, I think you're the only person with this setup. If I ever do use my MSD on a rotary again, I'll get one of those coils too.

It's like comparing apples to oranges at this point; it's nothing but subjective opinion because the transistor trick is simply too new. A few of us have it, and those that've hooked it up so far, totally love it. That's all well and good, but what do they have to compare against? Let's get some real scientific comparative data, please.

FB II

hopefully i'll have some of that here shortly

Kentetsu

FB II - I think you will be very impressed by the transistor trick if you get to check it out. All I can say is that I never would have believed the amount of hp that could be gained through ignition. I thought that when I upgraded to the straight 2nd gen mod I had gained power, but this is way more impressive.

I just added a Sterling carb, which is dumping so much gas into my little stock port 12a that I didn't think it would be able to handle it. But once I get into the throttle its nothing but power. Sure as hell seems like its burning all of the gas that's going into it. Anyway, I'd love to see some official testing done on this system.

peejay

Well, there you go.

You used the stock crapola coils, for one thing.

Secondly, it's NOT about a power increase! With a properly tuned carb or fuel injection, you should see only a minimal (if any) difference in power. The difference is in conditions where the mixture is nowhere *near* optimal, or you're dealing with lots of exhaust dilution, etc. THEN you'll see a night and day difference.

Hyper4mance2k

iTrader: (40)

for those of you who don't know what I did....

https://www.rx7club.com/showthread.p...=1#post4828328

evil_motors

iTrader: (3)

peejay i have had no problems out of my second gen coil.. my car starts up like butta... and idles a hell of alot smoother.. maybe you could have hooked something up wrong or something.. its way better than stock though.. and since i got the coil and dizzy for about $50 thats alot cheaper than MSD.. i thought i read somewhere that msd didnt fire right on rotarys..

Latin270

How could MSD fire wrong? Its still gets the signal from the distributor, just fires hotter and the car runs smoother at all rpm's. I like to use whats proven on the track. I've been to many drag races and always see MSD 6 box and coils in most rotory powered cars...especially old school Rx's.

FB II

well, hooked up my 2gcdfis today. cranked up first try... haven't taken it out for any boosted runs yet but we'll see what happens. one thing i do like, is how it looks under the hood when the msd comes in i plan to do just like hyper4mance2k did

evil_motors

iTrader: (3)

well i read something that said msd isnt set up for rotary engines thats why people used jacobs .. i dont have anything to back that up i read it in the 1st gen faq page.. i am just trying to say that for the money the 2g coil cant be beat

Kentetsu

FB II- Are you using the transistor trick with it?

wecycle

would it be possible to use an Accel ecoil with dual high voltage terminals to get direct fire instead of the 2gen ignitor/coil?

FB II

nope and never will, i almost blew my engine because of this mod tonite. for some reason i didn't realize it's a wasted spark setup. so, basically it's firing in my exhaust stroke and all the unburnt fuel (turbo setup here, lots o gas) is bellowing out my exhaust in HUGE FLAMES while at WOT!!! but, not only is it a light show, it's killing my boost and popping very violently. not cool. oh well, i tried it and it sux. for a boosted carb setup that is. i will admit tho, idle cleared up a bit and off boost drivability was a tiny bit smoother. but i dont care about that, i need boost. lol

so, msd 6a ignition box to the leading side of the distributor cap for me thank you. WOOOOT!

Kentetsu

LOL. I guess that would cause some issues...

mwatson184

I don't think the ignition is to blame for that, you might have another unrelated problem. I could be wrong, we will se what happens when you get that msd.

-Marques

racintang

Remember, If you are using an MSD system, it is imperative that the line running to the distributor be sheilded and not be running near any other power wires. Other power sources can disturb the magnetic field and cause a false triggering. If you look at your original loom it is copper shielded for that reason. If you live near an airport they usually have it since it's around some of there wiring systems.

This might help. http://www.action-electronics.com/braid.htm

I have seen it first hand with my cars as I have been using MSD's for a long time. And also if it is in the engine bay be sure to keep it out of a high heat area. Mine is actually mounted in the passenger compartment so that people can see what I got plus it's out of the elements and moisture and I can change my rev limiter without getting out of the car.

Email me for pics if you want, plus I have the MSD wiring diagraphm book which has the setup for roatary engines.

zfrederick@***.net