Has anyone ever tried one of these on there 7? I've been looking for aftermarket ignition system and was looking at the jacobs rotary and the msd 6AL but then I saw that msd offers a distributorless ignition system with all the capabilities of the 6AL. Any input on aftermarket ignitions would be apreciated.

 

A DIS-2 is used on a *TWO* channel system.
Therefore, it's a waste to be used on the leadings.
Installing a DIS-2 on the trailings (only) is overkill, unless you're making over 400hp.


-Ted

 

So how many channels are our ignitions. Actually I should be asking what a channel is.

 

One channels fires both leadings.
Therefore, if you want to stuff a CDI box on just the leadings, you just need a one channel CDI box.
cheap - MSD 6A, Crane Cams HI-6, Mallory Hyfire
expensive - MSD Digitial 6

For trailings, there are two channels for T1 and T2.

A "channel" is a unique ignition channel or wire that has it's own unique signal from the ECU.
The stock ignition uses three channels of ignition: L1 + L2, T1, T2


-Ted

 

good info ted!

 

Thanks Ted, that cleared up alot of unclears! So could this mean using the dis4 and not use the 4th channel?

 

Short answer, no - we tried it.

Long answer, the DIS-4 wants to see (up to) 4 sequential ignition signals.
This means the ignition has to fire (up to 4) equally spaced ignition trigger signals to work properly.
Since the RX-7 L1+L2, T1, T2 ignition channels do not fire at equally spaced intervals, this confused the DIS-4 and causes it to barf.
It would've been nice if it did.
About the only thing that I know will work is the Autronic unit which costs a LOT!


-Ted

 

darn, the reason I wanted an aftermarket ignition upgrade is for the driveability and the ability to run a 2 step rev limiter. Since a drag and bracket race, a two step would be a nice nice thing to have. And ever since I vented the stock BOV to the atmosphere my idle dropped to 500 RPM. Since I have mostly opened up all the intake and all of the exhaust, and this is my daily driver, it would be nice to have a rock solid idle and a little more torque. Thanks again for the info Ted.