I am loseing spark on both leading coils above 4000 rpm. I havent had a chance to datalog pickup yet but I thought mabe someone else has had this problem. I am running a gen 2 cas with a DIS 4 MSD. I am useing a E11 V2. Any help would be greatl.

 

you got the rev limiter on the msd turned off?

 

Tought of that right after post. Ill have to check tomorrow. If that is the case I will feel really dumb. Thanks for your input.

 

What is your trigger gain set at?

 

A single DIS-4 for the leadings AND trailings???
Uh, you can't do that...


-Ted

 

well don't feel bad..i'm having some kind of ignition problem too...

give help when you can, get help when you need it. it's like the penny tray at the 7-11

 

I am running a DIS 4 and a digital 6 but I am not haveing problems with the leading. The gain is set 2 on both trigger and home. The trigger filter is 0 and the home filter is 2. Thanks again

 

So you're running a DIS-4 on just the trailings...ignoring two of the 4 channels???
How come you didn't just use a DIS-2???

We've had all kinds of headaches trying to get our DIS-4 to fire cleanly on our 20B.
Keeping the high power output side away from the low power input wires seem to help, but it would still barf.
I hope the unit is away from the coils?


-Ted

 

Are you using the motronic filters? dont, disable that, set both trigger gain and home gain levels to zero ( 0 ) and try it again. The X picks up a lot of noise through the trigger, so the lower the gain the better. And like RETd said, runing the trigger wires separate from the ignition system, alternator, etc, helps reduce noise.

 

Ok the plot thickens. The rev limit is turned off, all the switches are turned off. Hooked up 4 spark testers to the plug wires and set them at 35kv. Removed the cas and spun it with a drill motor. I didnt trust the timing light I was useing so I wanted to see what was going on. Started off at a slow speed 1500 rpm indecated, great constant spark. Spun it up to about 4k and lost trails again. After doing this several times all the sudden no spark at all leading or trailing. Checked the fuses and sure enough blew a 15 amp fuse in the haltech fuse block. I am runing both msd trough this fuse wich should be enough since it is only on the turn on circut for the msd. The main power wires are run trough a 50 amp circut braker connected straight to the batt cable. I am wondering if there could be too much voltage drop across the ignition switch. I think this weekend I will rewire the fuseblocks useing a relay instead of the switch.

The reason I am runing a dis 4 is because the tech rep at msd told me that the dis 4 runs 2 caps. instead of 1 for the dis 2. He said that the dis 2 will have a hard time charging the cap. at high rpm. That doesnt really make any sence because a waste spark 4 cyl will have two coils and it will charge them at high rpm with no problem. But who am I to question him?

Also it says in the haltech manuel not to run an extra relay for the fuel pump but I cant see how that 14g wire can run an aeromotive A1000 fuel pump. Does anyone know why haltech says this?

I dont know if the e11 has a motronic filter? I dont remember seeing it in the setup.

Thanks everyone for the input.

 

Oh shi$ sorry, didnt read that you had an E11, my bad, the E11 doesnt have that problem. So guess my original observation was wrong.

 

Ok, I think I know what is going on. Since I first got the car running I have had problems with the DIS 4. Originally I thought it was the timing light I was using that was giving me problems but now I think it is the MSD. Has anyone else had problems with the DIS 4 or did I just get a defective unit? I have eliminated all of the wiring and the ecm as a cause of the problems and don't know weather or not it is worth having it repaired. If it becomes a problem unit I would rather go with 3 digital 6 or stock igniters. Am I wasting a lot of time and money here? Is the msd any better than stock igniters. And to add insult to injury I killed my digital 6 today. The coil wire fell off the trailing coil and it arced into the neg wire on the leading coil. Now I have no spark at all!!!!

 

For that kinda set-up, I agree...
Use the stock Haltech wiring just as a turn on.
Run a dedicated circuit + relay for the power side of the fuel pump - use the Haltech circuit just as a turn-on for the relay on this circuit.

BTW, throw that piece of **** DIS-4 away.
Like I said before, we've had too many headaches with ours on our 20B.
We're going LS-1 coils now.


-Ted

 

RETed,

Im pretty sure you are aware by now, but if not here it is, MSD themselves have expressed that the DIS4 circuitry cant fire the rotary's trailing ignition fast enough, that is the source of the problem.

And since AEM's C2DI box is a nightmare as well, the real best solution is either OEM coils and igniters or Haltech/Bosch igniters and MSD coils with aproperly set dwell time.

 

No, it's a little more complicated than that.
I believe MSD claims 9,000RPM max rev's on a V8?
This means this should be no problem at least to 4,500RPM on a 4-cylinder.

We've run into problems where the MSD would barf running on the freeway at a lowly 3,000RPM on our 20B!
This is light load, cruise.
An aftermarket (Defi?) tach is hooked straight from the MSD DIS-4 dedicated tach output wire, and it misfires occasionally - the tach drops to zero, and the engine runs like ****.

We're tired trying to get this thing to work.
It's a $300 piece of **** doorstop IMO.
We've bothered MSD tech support since 2000 about these DIS-4.
We even sent in TWO DIS-4's to get them inspected - both came back with no problems, according to their service department.
I'm PISSED at this crap that MSD puts out: stay away from their multi-channel **** - DIS-2, DIS-4, and all that Stacker crap.
Their single channel stuff is okay.
Sorry, but my first hand experience has not been very good with these things.


-Ted