dizzy ignitor question
 

Ok so I've been looking at a lot of threads about timing and dizzys and am planning on swapping the fb dizzy from my parts car into my daily driver that has an sa engine. Somewhere I read that though this is a good upgrade once the ignitors go out they cost like $100+ to replace for a good used one so its cheaper just to go msd at that point. however I'm using a 2g leading coil and am planning to ditch the trailing so cant I just use the ignitor that's in the 2g coil if my factory ignitor ever does go out? Also I'll do some searching later but does anyone know if there's a way to wire the tech to work without the trailing hooked up? Can I just wire it to the leading?

You can't use the 2G ignitors, its not compatible with the signal from the dizzy, its
designed to be fired by a computer or standalone.

You can use an GM HEI ignitor as a replacement and it works great and is cheap.
See the link in my sig TFIDFIS. This is a lot cheaper than an MSD and works almost
as well.

The tach just needs to see the same trigger thats used for the coil. So in your case
add your tach connection to the 2G coil trigger (negative lead normally). SA nornally
already trigger off the leading coil anyway.

the gm ignitor setup looks a lil complicated but ill read the entire thing after work and im sure ill have some questions lol. Thanks!

ok now since im not gonna run trailing spark and im gonna be using a 2g coil cant i just use one GM ignitor? and can it be a 4 pin?

Yes and yes.

Just make sure you bypass the igniter in the coil.

Yeah I'll probably go ahead and remove the ignitor from the coil completely. Ignitor brand doesn't really matter does it? Cuz I can get one from summit for a lil over $20 but I think it's some off brand.

hey also just out of curiosity howd you mount your alt down there? it looks like you used the factory alt bracket. Ive been trying like crazy to move my alt down there and just couldnt figure it out and the relocation kit is pretty expensive and now i cant even remember who still sells it.

Relocation kit made by Pineapple Racing, NLA. I got it in the classified on the forum.

https://www.rx7club.com/1st-generation-specific-1979-1985-18/2gcdfis-w-tt-transistor-trick-write-up-simplified-design-483858/ why dont you do this? i am. to my knoledge its the best thing you can do. And its cheap. Im making one tonight. My car isnt on the road yet, probably wont be until next summer. but i just bought a 2nd gen coil for $20 and this costs about $15 for the parts. soldering is extremely easy, solder and an iron is like ~15.

Neat as it is, the TT had some flaws. I don't remember the details but its not exactly
right in its application. Kent, the inventor would know more details. Definitely a fun
project. I built one but never used it on my 7 yet.

yeah im just gonna stick to this plan cuz its easier, electronics are way over my head, and itll only cost me 30-40 dollars. the autozone i work at has a duralast GM 4 pin for about $22 so after my discount itll only be about 17 or 18 + whatever wire and connectors I may need but I think I already have wire and connectors.

i thought the gm ignitors had problems at high rpms? and $15 is still better than 17 or 18. electronics are simple. your not dignosing anything. you just put the pins in the holes like in the pictures, hold the soldering iron on them and touch solder to it until it melts. its simple, should take about 15 min. it seems easier to me to make that than to try to use a different ignitor. not to mention better mileage.

Better mileage? Really? Damn now I gotta read that whole damn thread and decide which one I wanna go with lol

its not a proven fact i dont think, but i know that he says that some people have an increase in mileage up to 3 mpg. im telling you, that is a simple circuit to make. i looked at how you wire up the GM ignitors and it looks not only more difficult, but more messy in the engine bay as well.

Na I believe all I have to do is run two wires from the ignitor plug on the dizzy to the control module then from there to the 2g coil. Simple.

what link did you get this from?

t_g_farrell's signature "TFIDFIS" why? am i wrong about that?

no, I was just wondering where you got your info from. Do what you want, im just set on making the transistor box. 1. because when people ask what it is i can say i made it, and 2. because the coils and ignitors were made for the 7, not a GM. Thats just my opinion haha Good luck! Ever get your carb straightened out?

I think it's a good thing were goin with dif setups that way we can see how each one works an holds up down the road. Yeah the carbs workin much better now but my secondaries stick every.now and then and I have them set up mechanically so to get them open I have to push on the pedal harder and then they pop open and I'm thinkin thats kinda hard on the drive train so I'm just gonna swap the base off another carb

there will be more resistance on the gas pedal now that your using it to open them instead of vacume, how would that be hard on the drive train? both the TT and the GM have been done time and time again, its not like were the first ones lol.. btw than you gslse addict for the info!!

cuz when the secondaries finally open (when they stick) they snap open and it makes a really hard lunge. true theyve both been done but i havent seen many posts about them.

Either one of these ignition solutions will net you better mileage because you get
a hotter spark. So do whichever one tickles your fancy.

The GM HEIs will have issues above, I think 8K but really, how many folks have
an engine built for that range? If you do, then you need a serious solution like
MSDs or a standalone to deal with that rpm range anyway.

BTW, using 2 HEIs and 2 coils (one for each leading) gives an even better ignition
response than using the 2G coil and a single HEI. I ran the 2G before I went with
the TFI coils. Just something to think about.

yeah this is my DD so it only sees about 7k rpm every now and then. I'm just gonna do the single ignitor and 2g coil for now since im on a budget and upgrade to two ignitors and two coils later. Thanks for the info and advice.

if you can't figure it out I've got plenty of J-109 ignitors Im willing to sell

Hey t_g_farrell what vehicle can the coils you used on your setup be found in?