wesilva

iTrader: (35)

I'm a real electronic retard. Is there any benefit to getting an aftermarket distributor modulator and high output coil for my HEI if I'm already running a MSD 6A Ignition Control Unit?

Apeiron

Probably not. There isn't even any benefit to the MSD 6A on a stock engine.

wesilva

iTrader: (35)

Apeiron,
Thanks for the reply. At what level of engine modification does the 6A begin to make a difference?

Apeiron

Ignition upgrades won't do much until you're running high cylinder pressures or high RPMs that the stock ignition starts to misfire at.

nelapse

iTrader: (17)

There are two reasons I run an MSD-6AL

#1 Rev limiter

#2 Allows you to set an anti theft switch. There is a wire to the system that if you ground it out, the car will not start.

Those reasons alone were worth it to me, besides, if you have a carb non-computer controlled engine the rev limiter protects the goods. However, looks like due to your stats you have a 2.8 and you already have a rev limiter.

Apeiron

The rev limiter is a useful feature, but his 6A doesn't have it. Anti-theft isn't really a feature though, since the stock ignition can be wired for anti-theft just as easily.

nelapse

iTrader: (17)

How would you wire the stock ignition for anti-theft?

Apeiron

Interrupt the +12v to the distributor.

nelapse

iTrader: (17)

The MSD-6 system utilizes a ground that faults the system. It is a little more safe than a 12VDC source hanging out at a switch. Plus, I guess if you think about it at an electrical way, the wire you would need to run to get it in the cabin would have a substantial voltage drop. So the voltage that ran to the coil would be less to be amplified.

Not enough to make a difference in a stock car or if you have a high performance coil, but maybe in a super high compression car.

Just something to think about.

Apeiron

No, it wouldn't have a substantial voltage drop. It wouldn't be doing anything that the factory ignition switch in the steering column doesn't already do, and wouldn't be any less unsafe. If you were still worried about it though you'd use a relay, not a switch.

VenomX-87

Ok anti theft device quick instructions:
1: Locate PINK wire out of steering colum.
2: Cut PINK wire.
3: Install relay in the broken pink wire to complete circut again.
4: Ground one *switch* side of the relay.
5: Get a $2 switch from a auto store and have one side of it to constant power.
6: Run a wire fron the other side of the new switch to the other connection on the *switch* side of the relay
7: HIDE youre kill switch.
8: Remember turn hidden switch on before atempting to start youre car or it will just crank till youre battery is flat.

On my old car i did it a little different instead of a relay i had a high amp 3 way switch (1 in 2 out) so if it was down it would go on one path and if up it would go another.
well up was normal ON position so the car would work normaly BUT down goes to the horn so if you tryed to steal it you would look like a bloody idiot sitting there cranking over a car with the horn flat out.