Swapping CAS for Dizzy

sen2two · 07-13-2010, 09:49 AM

I have seen it done before on the stock ECU. Or at least the owner of the TII said it was the stock ECU. I wish i asked him a few more questions, but this was a while ago, and i didn't know much about anything at the time...

So i was wondering if anyone here knew how, or if it's even possible, to swap out the CAS and use a distributor for ignition on the stock ECU.

There are a few reason why i don't think it's possible. But lets see what a few of you have to say about it.

RETed · 07-13-2010, 09:55 AM

WHY?

If you insist on a distro, why not just yank the whole stock EMS?

The stock ECU still needs to see "RPM".
How do you getto rig that with the distro?
You gotta run some kinda step-down signal off the distro for the stock ECU to read it correctly?
Set up some kinda mag pick-up like the stock CAS?

Are you just doing this to brag that you can do it?

-Ted

sen2two · 07-13-2010, 10:01 AM

Never said i was doing it. Or even came close to "insisting" i was going to. Just a curiosity thing because i have seen it. But i have always suspected the guy was lying.

RETed · 07-13-2010, 11:48 AM

The stock ECU needs to see a 12 + 1 signal.
I dunno how you would retrofit that into a disto without a lot of custom modification.
That signal is a very low voltage Hall-effect type signal since it's a mag sensor triggered by a gear tooth.

I NEVER SAID IT WAS IMPOSSIBLE.
I JUST SAID IT WAS A PAIN IN THE ASS.

Why not preface your post by saying you thought someone was lying in the first place???
Then we would've just told you that person was a liar.

Distro threads will usually end up in a war.
Just like talking about carbs...

YOU SHOULD KNOW BETTER THAN THAT.

-Ted

Pete_89T2 · 07-13-2010, 12:05 PM

I've never heard of anyone being able to do this with the stock ECU, nor do I understand why anyone would want to...

That said however, I do know that when the earliest Megasquirt kits (a DIY EMS) came out, it could only control fuel on a rotary, so the easiest path to full fuel + ignition was to have the MS handle fuel and swap out the CAS for a dizzy from an FB for spark.

The current crop of Megasquirts are capable of full rotary ignition support, leading & trailing, at least for the 2 rotor engines. Don't know if they can support ignition on a 3 rotor 20B though.

Pete

jtbshaw · 07-28-2010, 12:46 PM

Out of all of my years with rotaries, I have never known of anyone running a distributor with the stock ECU.

I am currently doing a CAS to distributor/blowthrough on my son's TII. But, I have pulled the ECU/wiring harness and having to re-wire lots of stuff. I am doing a direct fire setup like Jeff20B's old system that worked so well. It's a challenge, and it may not work well at all with the turbo, but I am just doing something different. IOW, something you just don't see everyday.

RotorDad · 07-28-2010, 04:51 PM

I used a Disi on one of my 7's when I was running A Haltech F3 (fuel only). I have never personally seen it done with a stock ecu.

Max777 · 07-28-2010, 10:38 PM

There was an early model of the FC.... in either europe or the middle east that used a distributor. One of the first years of it, and I believe it was non turbo. I saw pictures, and it does exist, however this was one of those quirky things that only lasted a few months or something to that extent.

I really wish i saved those pictures so I could show you.

Pete_89T2 · 07-29-2010, 05:23 AM

Quote:

Originally Posted by Max777

There was an early model of the FC.... in either europe or the middle east that used a distributor. One of the first years of it, and I believe it was non turbo. I saw pictures, and it does exist, however this was one of those quirky things that only lasted a few months or something to that extent.

I really wish i saved those pictures so I could show you.

Interesting... As most of you know, the '84-'85 GSL-SE models (US spec) had fuel injected 13B engines that were very similar to the early FC's. They had a simpler FI system with only 2 injectors, and it had an electronic ignition distributor with vacuum advance. I know because I used to own one.

My5ABaby · 07-29-2010, 08:18 AM

I believe the pre-production FC that Holly brough to Deals Gap ran on a distributor. Of course, I have no clue what kind of ECU it was running.

RETed · 07-29-2010, 11:00 AM

Yes, I've seen it in Europe.
Electronic ECU unit + distributor + fuel injection
No, it wasn't a 1st gen system grafted into an FC3S chassis - there were 4 fuel injectors.

-Ted

classicauto · 07-29-2010, 02:19 PM

Quote:

Originally Posted by RETed

Yes, I've seen it in Europe.
Electronic ECU unit + distributor + fuel injection
No, it wasn't a 1st gen system grafted into an FC3S chassis - there were 4 fuel injectors.

-Ted

Yep, there are a few of those around. Holly brings one out to DGRR every year. Has that S4 factory body kit on it (finishline?) a turbo hood, full EFI - but it has a dizzy

EDIT: rob has beat me to the punch!

07-13-2010, 09:49 AM	#1
sen2two KTEC Join Date: Jan 2009 iTrader: (2) Posts: 642 Rep Power: 0	Swapping CAS for Dizzy I have seen it done before on the stock ECU. Or at least the owner of the TII said it was the stock ECU. I wish i asked him a few more questions, but this was a while ago, and i didn't know much about anything at the time... So i was wondering if anyone here knew how, or if it's even possible, to swap out the CAS and use a distributor for ignition on the stock ECU. There are a few reason why i don't think it's possible. But lets see what a few of you have to say about it. __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

07-13-2010, 10:01 AM	#3
sen2two KTEC Join Date: Jan 2009 iTrader: (2) Posts: 642 Rep Power: 0	Never said i was doing it. Or even came close to "insisting" i was going to. Just a curiosity thing because i have seen it. But i have always suspected the guy was lying. __________________ what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2

07-28-2010, 04:51 PM	#7
RotorDad Big Ugly Join Date: Apr 2009 Location: Fredericksburg, Va iTrader: (1) Posts: 591 Rep Power: 16	I used a Disi on one of my 7's when I was running A Haltech F3 (fuel only). I have never personally seen it done with a stock ecu. __________________ *Boosted Big Body On 335's* PS3 ID: Rotordad 1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect. 2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect.

07-28-2010, 10:38 PM	#8
Max777 Pirate Join Date: Mar 2008 Location: Central IL iTrader: (5) Posts: 1,323 Rep Power: 18	There was an early model of the FC.... in either europe or the middle east that used a distributor. One of the first years of it, and I believe it was non turbo. I saw pictures, and it does exist, however this was one of those quirky things that only lasted a few months or something to that extent. I really wish i saved those pictures so I could show you. __________________ Rotaries:They are NOT that complicated!

07-29-2010, 08:18 AM	#10
My5ABaby Sigh..... Join Date: Feb 2008 Location: Murfreesboro, TN iTrader: (6) Posts: 2,377 Rep Power: 19	I believe the pre-production FC that Holly brough to Deals Gap ran on a distributor. Of course, I have no clue what kind of ECU it was running. __________________ 1986 Sport: 132k miles, 5A (Sapphire Blue Metallic), Tokico Blues, Racing Beat Springs, Custom LED tailights (only S4 LED tails in the world), SSR Mark II, Racing Beat exhaust, S5 black interior, Rotary Resurrection rebuild at 120k miles Community Service Manual RotorWiki "Imagination costs nothing; we could build square locomotives or fly to Mars" - Felix Wankel Yesterday is history, tomorrow is a mystery, but today is a gift. That is why it is called the "present."

07-13-2010, 12:05 PM	#5
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD iTrader: (1) Posts: 874 Rep Power: 15	I've never heard of anyone being able to do this with the stock ECU, nor do I understand why anyone would want to... That said however, I do know that when the earliest Megasquirt kits (a DIY EMS) came out, it could only control fuel on a rotary, so the easiest path to full fuel + ignition was to have the MS handle fuel and swap out the CAS for a dizzy from an FB for spark. The current crop of Megasquirts are capable of full rotary ignition support, leading & trailing, at least for the 2 rotor engines. Don't know if they can support ignition on a 3 rotor 20B though. Pete

07-28-2010, 12:46 PM	#6
jtbshaw ORD - Old Rotary Dude Join Date: Feb 2008 Location: Pelham, AL iTrader: (3) Posts: 319 Rep Power: 17	Out of all of my years with rotaries, I have never known of anyone running a distributor with the stock ECU. I am currently doing a CAS to distributor/blowthrough on my son's TII. But, I have pulled the ECU/wiring harness and having to re-wire lots of stuff. I am doing a direct fire setup like Jeff20B's old system that worked so well. It's a challenge, and it may not work well at all with the turbo, but I am just doing something different. IOW, something you just don't see everyday.

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