Is there a way to add a rev limiter?
 

I will be autocrossing my car and doing the occasional track day and I would like to have a rev limiter, but my car is kind of a ba$tard and I'm not sure if there's a way to add one on. The chassis is a 74, the engine is SC with CIS, and the distributor is a 964 unit modified by Rennsport for mechanical advance. So, I can't use the rev limiting rotor and the car doesn't have the fuel cutoff switch that an SC would have. Is there a way to limit the revs or should I just install a shift light and pay closer attention to the tach?

What type of ignition are you running with your dual plug? The msd boxes have rpm "pills" that you simply plug in and cut igntition at a certain rpm. If your running stock CDI's I have no idea what you could do but I am sure there is a way to limit them.

Best of luck

If it were me, I'd install an MSD 6AL, MSD High Vibration coil and use the very nice "soft-touch" rev limiter that these have.

Shift lights is always a good idea but a real rev limiter helps keep you honest when afflicted by the "red mist",....:)

I've got stock 6-pin CDI boxes and I'd like to stick with them. Guess I'll have to go with the shift light.

I have found a stand alone rev limiter in the aftermarket that is designed to work with CD ignitions and is completely adjustible. I have not yet tested it but I can give you the info if you want.

Are you referring to the CraneCams rev limiter? I was reading up on that but wasn't sure if it could be made to work with a twin-plug setup.

In this case you should be able to add the US style SC fuel cut relay. I believe it runs off a signal from the tach.

It is not made by crane cams its Jacobs Electronics ( don't know who owns them) but it is specifically for CDI ignitions.

Tell me more. What information do you have on this mod. Is it adjustable (for example, by using a particular resistor)?

If you are referring to the Jacobs set-up I mentioned I can get you the exact model if you wish. It is a small add on box (radar detector size) that wires in very easily. You can select any desired RPM cut out by just turning a knob on the front on the unit. As I mentioned earlier I have not used it yet as my project is still being finished but I did buy and install the units.

The US style rev limiter relay 911.617.136.00 is wired to the fuel pump relay and uses a tach signal to interupt fuel at 7000 rpm I do,nt know if a resister could be used to change it. It is standard equip in any US delivery SC ( behind the dash) . See the recent thread by ecm911.