speckamp

So I went and changed the oil in the car today, and I put in a quart of MMO in there with it, so we'll see how Denny's magic potion works. I also started running MMO in the gas, so we'll see how THAT works too. Since I havn't gotten my extra ignitor yet, and I didn't have all the bits I need to hook up the MSD box so I setup my ignition for Jeff20B's single ignitor dual leading coil system. I noticed a slightly smoother idle, and it seems happy. Hopefully I'll get the MSD box hooked up soon.

Anyway, I also updated the webpage... I got really pissed at having to update the driver's log manually, so I setup a php / mysql based page that let's me update the page through a form on the net. Much swankness.

Ok, I'm done taking up your bandwidth! It's almost winter here, snow saturday / sunday!! so Rexy might be going indoors sooner than I thought! :cry:

Jeff20B

iTrader: (13)

Sounds like you're upgrading in the same stages as I did. First with dual coils on the Leading ignitor, then with the MSD, then with dual ignitors.

Yeah, that smoother idle is the way the 2nd gens all run (with double sparks) and others who have hooked up direct fire on the Leading. Could you tell me how your high RPM power is? Does your exhaust sound different?

I saw your web page. Pretty cool!

rxseven

Can you guys give me a little insight into the single ignitor, dual leading coil set-up. Is it as simple as connecting the leading coils in series and then firing the spark plugs directly?

speckamp

All I did for the leading setup was plug a set of plug wires into a pair of MSD blaster II coils, the original + wire from the loom is on the + of one coil, I've got a jumper wire going from the - side of that coil to the + side of the second coil, then the original loom's - wire goes to the - of the second coil. Easy! here's jeff's page http://www.geocities.com/cd23c/poorman.html on the setup I used. When my second ignitor get's here, I'm going to this setup http://www.geocities.com/cd23c/dlidfis.html which should be intresting. I noticed it's quicker to rev to 6000 - 6500 but then not quite as quick to 7000 or 8000. The exhaust note sounds a little different, but nothing spectacular, of course with the 2 exhaust leaks, it's really hard to judge sound since there's just "alot of it" The car feels a tad peppier, but then I've been driving an 88 accord all week so...anything's peppier than that :p

heh, glad ya liked the page, I got majorly bored at work

--matt

Jeff20B

iTrader: (13)

Yep, that's about it!

Hooking two coils together in series to a single (Leading) ignitor.

Just a word of caution about the Yaw timing settings. They apearantly crack Trailing plugs. I didn't know this because I haven't cracked one yet. Kinda scary!

speckamp

that'd odd, I'd never think that you could break plugs by just changing the timing..... Hmmm, I think I'll use David Lane's suggestion then and just advance them +5 or so degrees and maintain the 10degree split. I think I posted this before but he said that's what he's running and he's running 7-9psi on a stockish 6port motor w/ a t04 and has been for a while now I guess...so I'm thinking that it's pretty safe.

--matt
(heh, glad to see someone's reading my posts
c-208.158.239.221.moore.com - - [05/Oct/2001:09:39:47 -0400] "GET /~mernisse/rx7sig.jpg HTTP/1.1" 200 19904 )

Turbo FB.

I like it 1 Great idea I would like to try this on my RX2,
Its running 82' ignition system.

Q: Can i use a 2nd gen. coil insted of two 1st gen coils ?
I just have some extras laying around.

Great Web-Sites everyone.

rxseven

Seems like using a dual output 2nd gen coil would be easiest way.
would that be compatible with the existing ignitor?

speckamp

I believe the 2nd gen coils have integrated ignitors. So I'd think that it'd be easy to wire in. If they don't have build in ignitors you should still be able to use it in the setup.

--matt

Jeff20B

iTrader: (13)

A guy tried using a 2nd gen coil with a first gen ignitor and fried the ignitor. The reason why is because the 2nd gen coil's ressistance is too low.

If you can some how get the 2nd gen ignitor to work with the 1st gen pickup, then you'd have something that should work for you.

speckamp

maybe trying to wire the coils in parallel w/ the 1st gen ignitor, that should increase the resistance the ignitor sees...maybe?

--matt

Pele

iTrader: (28)

Anytime you wire anything in parallel, it decreases the resistance.

Jeff20B

iTrader: (13)

Yeah, try it in series... er well, don't.

speckamp

I think the 2nd gen coils were designed to be fired simultainiously, so they prolly made lower resistance coils so they didn't have to re-design the ignitors. That's just my theory tho, since I know the ignition system for the second gen fires the leading plugs together, and then uses a "selector" pulse to tell the trailing coil back which rotor to fire....

Might be intresting to try since you have spare coils lying around...



--matt

Jeff20B

iTrader: (13)

The Leading coil on a 2nd gen has dual high voltage outputs and only one ignitor. The ignitor takes a signal from the ECU and tunrs the primary winding on and off. The secondary winding is shared between two plugs. the bean counters liked this.

The Trailing coils are seperate units, each with its own ignitor. At least, that's what I've seen. This also holds true for the '93 coils. I'll stick to my own ignition system. It's cheaper and is easier to work on.

But by all means, if you have extras to play with, go for it!

speckamp

if the 2nd gen coils have integrated ignitors (glad I remembered right ) then why not just send the magnetic pickup signal to the ignitor? Any idea of the compatability of the trigger?

--matt

speckamp

Heh, I condenced all the odd news strewn about the site into one database, and made a news page akin to the mods page. It's now all in one place

--matt

Jeff20B

iTrader: (13)

Well, the first gen pickup uses a magnetic pulse simialr to tapping on a speaker cone. The 2nd gen ECU has a different kind of signal that trips the 2nd gen ignitor. The 2nd gen CAS has a different sort of pickup too. It's like apples and oranges.

speckamp

ah, figures.

If you wanted to use a dual post coil like that, just get an aftermarket one, or one for like a GM DIS system. MSD makes a mounting bracket for it, and you can just wire it up like you would 2 coils in parallel (since you've only got 2 wires anyway for that coil)

--matt