Okay, I am reading alot of the old archived threads and it seems the TT is the thing to do after this mod. First off, will the J-109 handle a second gen coil? Do I need to worry about it burning out? Second, has anyone used second gen coils on the leading and trailing ignitions? if not why?

I am getting ready to dive into this mod, and just dug up some threads that made me scratch my head. I was starting to worry I might not want to do this until I do the TT, I dont want to burn out my ignitor, and then not be able to use the 7.....
Thanks,
Chris

 

Go for it. It will only work on the leading ignition though, don't try it on the trailing or there may be dire consequences.

Don't cut any wires, just remove them from the post on the new coil pack. Then take the wires off the stock coil (+ and -) and move them over to the new coil. Run the plug wires accordingly and you'll be all set.

The original instructions state that you need to use the resistor that is inside of the coil pack, but many have run without it and have been fine. I would run without it, so that you don't have to cut any of the wires. That way, when the TT units are ready, the installation should be a snap.

You'll like this mod. Not nearly as much power as using the TT, but still much better than stock.

 

I have it on mine Chris, 10,000 miles on one car then transfered it to the red one whilst the black one is being built into, well you know....Anyway the red car improved economy, smoothness and response just like the black one did.

It's a great mod.

 

I am confused as to what dire consequences you would have on the trailing ignition? Is it difficult to get them to fire correcty? I was just wondering as to what success if any that people have had. Sorry, I havent been on in awhile I got my LSD out of an '84 GSL and then I decided to do one last good burnout on the old diff well lets just say I will post a video, and it led to the neccesity of immediatly swapping in my new diff.....

 

There was recent post on this and the issue the guy had was the trailing was firing at the same time as the leading, not a good thing, it was during the past week.

 

Well I havent been on very often this week, thats what I thought would be an issue. I just got the coils in the mail and once I wrap up this rear end I will dig into the ignition. I should get everything done in time for summer next up is an electric fan and I am done.............................................. ............ for now.....

 

i have my circuit board done, and all the wires waiting, i just gotta pick up the coil now, Iam hoping the junkyard down the road has one in one of the 3 2nd gens sitting there, i remember seeing one when i got my FMIC

 

Oh No!!! I just realized I have the parts to do DLIDFIS and 2GCDFIS, AH!!! What should I do!!!

 

Bump -- Thoughts? Experiences? Opinions? J/W....

I was looking through some old wire reels in the garage and realized I had an extra set of ignitors and coils... So.... what is better? or is there any real difference....

 

Go the route of the 2nd gen coil pack... Then later (when it is ready) upgrade to the TT unit.

 

Just a FYI after I upgraded to the 2nd Gen coil, I got 24.5MPG on a 300 mile road trip. The last time I checked before doing any upgrades at all, I was lucky to get 19mpg.

 

I did the 2GCDFIS mainly because it was more compact and was much easier to do. Took me about 10-20 minutes, I didnt notice a large performance gain, but it smells cleaner and revs smoother. My mileage has improved dramatically, I need to dial in the timing a bit more and I think I will have smoother starts.

 

Yeah, once you get the timing dialed in you'll probably find you have a few more ponies. Just wait until Kent gets the TT units ready though, then you'll see some real improvement!

 

Is Kent making new TT units? I was on the old list to buy one, but I was too absorbed in just getting it running with the original ignition to commit.

 

He is working out the final bugs now. Should be soon, just waiting on a working scope to finish things up I think...

 

awesome

that gives me more of a reason to be lazy and not set my timing, because then I'd have to reset it

 

Ok whats the TT unit since I am kinda lost whats the difference between the two and how much will it cost becouse I am tired of getting 15mpg in my DD.

Mindaugas

P.S. What is exactly that I need for this upgrade I kinda behind plus me and wiring are not the bestest friends.

 

Yeah, I am still working on the new ones. I think I still have a couple spots available. I need to get a working oscilloscope so I can fix a couple bugs in it and then we will be set. After these ones are sent out, I would be willing to do another batch if there is the need. The next batch would probably happen after I return to the US (about the 1st part of October). It is just too slow and expensive getting things here and back. Much easier to do in the US.

rotarycrazy: the TT is basically a circuit to convert the signal from the 1st gen ignitor to work with the 2nd gen ignitor/coil pack. The 2nd gen ignitor is normally fired by an ECU. The advantage of this is that the 2nd gen ignitor can handle more current and fires very strong at high RPM where the 1st gen ignitor starts to die off. It means a stronger spark across the RPM range, better response, and some have reported an increase in MPG.

The wiring of the TT is as simple or maybe a little more simple than the regular 2GCDFIS. The regular 2GCDFIS is where the 1st gen ignitor fires the 2nd gen coil. This is better than stock, but the 2nd gen ignitor is much better than the 1st gen one. Both options require a 2nd gen coil. The TT requires the circuit in addition. You can contact me when/if you want a circuit. It is also possible to do the regular 2GCDFIS now and then upgrade to the TT later.

Kent

 

Get a second gen leading coil. At this moment it is all that is absolutley needed.


I love this mod.... I have to say $30 later I am a VERY happy camper.

 

I would like to get on the list for a assembled TT kit

 

Would a 3rd gen coil work in place of a 2nd gen unit?

 

Sure. Either with the TT or like the 2GCDFIS. Should work. A couple people have talked about using the 3rd gen coil with the TT, but I don't think anyone has tried it out yet. I have heard that the 3rd gen guys like the 2nd gen coils better. Not sure if the 2nd gen coil is really better ot not, just what I 've heard. The 2nd gen coils are more common and usually cheaper, so that is why people use them instead of 3rd gen coils. If you have a 3rd gen coil on hand, give it a try.

 

just kinda came across this. the 2nd gen coil seems to be much stronger in the long run than a 3rd gen coil. 3rd gen coils are VERY much known to go south after theyve been hot for a while. the 2nd gen coils just seem to keep on trucking. also, the 2nd gen coils have the ignitors built into the base of the whole setup. the 3rd gen coils all have a separate ignitor which is located on the drivers side fender well. . . under the cruise control. . . or where it should be (note that r1/r2 models dont have cruise). . . basically look for the brake master cylinder and you should be able to find it.

i assume since you guys are using the 2nd gen ignitor for this "TT" mod, youd be way better off getting the whole 2nd gen coil pack. . . plus, theyre cheaper and MUCH easier to come by.

 

Thanks for the clarification. We don't hear much about 3rd gen stuff as they are usually more rare and expensive. Yes, we use the whole 2nd gen pack with this "TT" mod. The mod converts the signal from the our distributor fired ignitors to trigger a normally ECU fired pack. The 3rd gen stuff will work, but you need the ignitor and the coil. Good to know they are separate and where the ignitor pack is located.

 

I LOVE IT!!!

Thanks to everyone who helped me out with this!