Haltech 20B - E11v2 + 2 x MSD DIS-4
It's not the number of firing events that cause a problem.
Besides rotary firing events are no different then piston engines!
The problem would be if he tried to use the same MSD box for a leading and trailing event. The MSD needs at least 60 degrees before it can fire again.
Since he's using one box for the leading coils and the other for the trailing he will have no issues..
Besides rotary firing events are no different then piston engines!
The problem would be if he tried to use the same MSD box for a leading and trailing event. The MSD needs at least 60 degrees before it can fire again.
Since he's using one box for the leading coils and the other for the trailing he will have no issues..
Is it really necessary to run the amp on the trailing plugs? How much difference would it really make? I'm going to be running a NA 20b set-up and see no reason to add the extra amp for the trailing.
Cris, do you have any experience with the Mercury coils that Lance and Brian on EFI101 talk about all the time? Seems like a long duration inductive spark would be of benefit to the rotary if it's strong enough to not get quenched. Are you using the M&W CDI or inductive setup?
Thread Starter
Joined: Aug 2001
Posts: 1,115
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From: Santa Monica, CA
We're having a serious problem; the MSD DIS-4 built-in revlimiter is kicking in at about 50% of what it should be. For example, set it at 9,900 and it comes in around ~5000rpm. We're using direct fire from the E11v2.
I'm guessing this is something specific to the rotary that it doesnt like. Does anyone have any experience/suggestions
I'm guessing this is something specific to the rotary that it doesnt like. Does anyone have any experience/suggestions
Try the msd at it's highest setting 10,000, IIRC when you try and shut the limiter off it goes to it's default lowest level of 6250. I had a similar problem and this is what MSD told me. Oh and make sure the rev limiter on the haltech is not set, i have done that too 
.
13B-RX3,
You will need to have the waste spark mode set to "ON". From your description having all other switches "OFF" you have set the max limit to 6250 RPM. On switch 3 flip switches 5-8 to "ON", this will set the max limit to 10,000 RPM. If the coil charge time is adjustable you want it set to 2-2.5 milli seconds constant charge.
Thanks,
MSD tech4
.13B-RX3,
You will need to have the waste spark mode set to "ON". From your description having all other switches "OFF" you have set the max limit to 6250 RPM. On switch 3 flip switches 5-8 to "ON", this will set the max limit to 10,000 RPM. If the coil charge time is adjustable you want it set to 2-2.5 milli seconds constant charge.
Thanks,
MSD tech4
I just talked to Dre at MSD about this week before last. Even though you are using a direct fire setup you are firing the coil every 360* just a like a piston engine would in a wastespark setup. So you need to setup the DIS-4 in wastespark mode. When in direct fire mode on a rotary application the DIS-4 is thinking you are spinning twice the revs you really are and thus you get a rev limiter at half of what it's supposed to be. Set dial #1 at 1 and you should be good to go.
Thread Starter
Joined: Aug 2001
Posts: 1,115
Likes: 0
From: Santa Monica, CA
I just talked to Dre at MSD about this week before last. Even though you are using a direct fire setup you are firing the coil every 360* just a like a piston engine would in a wastespark setup. So you need to setup the DIS-4 in wastespark mode. When in direct fire mode on a rotary application the DIS-4 is thinking you are spinning twice the revs you really are and thus you get a rev limiter at half of what it's supposed to be. Set dial #1 at 1 and you should be good to go.
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