I just pulled the trigger on a 16 volt Battery and Alternator and installed a Moroso Accusump solenoid on my Dart. The solenoid fried within 15 seconds.
Is the MAC Valve going to do the same thing?
I just installed a 16V to 12 volt Stepdown and got a new solenoid.
So my question is if the MAC Valve can handle 16 volts, will the shifter shift harder and quicker compared to the 12 volt setup. I can put the Valve on the step down also and be safe but would like the Valve to work better on 16 volt if possible.

I don't see why not. I ran the Cuda for years with a 16 volt battery and alternator. My accumulator was also never an issue, nor did my C02 shifter solenoid nor the throttle stop solenoids. Many racers run the saem stuff without issue. Everything saw 18+ volts on every pass and I had zero issues with an electrical component. Our dragster is the same set up, 16 volt with alternator and 18+ volts every pass. It has an electric shifter in it and zero issues.

The Moroso instructions for their valve has "12V ONLY" across the top of the page. Haven't heard of anyone else having a problem though. The accumulator valve is on constant for the most part. The shift valve is only ON for a split second and have never seen any indication that 16V is a problem with them. I would call the guy who supplied it or look at their information online just to verify.

Thanks, does the valve shift any better going through 16 volt as opposed to the 12 volt?

The only way a C02 shifter smacks harder is with more C02 pressure. 110-120 psi ought to do it. I supply 16V to activate the solenoid. I don't leave 16V on it then supply ground to activate. I've never had any problem with dual 16V batteries and no alt. with any electric component. I've been involved with some S/C dragsters that had accumulators on them with 16V and no problem ever with them.

So the valve would go to the yellow wire on the MSD Digital 7 and the other wire to ???(where)

Ground.

Thanks, question if it was hooked up to 16volt positive, what issue would I have? Not to sound too dumb. I'm electrically semi-novice.Thankyou

It only sees 16V for a split second when the MSD sends it. I don't think you will have any issue. I actually think you could have the 16V sitting there and supply ground as well. The MSD 7AL-3's rpm activated switch supplies ground. I think you could run it either way (normally open or closed) with the digital. The solenoid sees voltage for only a millisecond either way. Mine runs off my Biondo Mega 400. I have everything fused as per their instructions. Just follow the MSD instructions as they are very good and simple.

Should I get the 10 oz. bottle vs. the 2.5lb. bottle? Any pro's or con's?
If I go with the 10oz. do you carry a spare?

I have a 5lb. mother bottle that I fill the small one with. Evacuate the bottle in the car before transfer. It uses very little just using the shifter. Seems like it lasts like half a year. The shift will be more consistent at 110- 120 psi. Some guys have SLE, shifter and parachutes and have to fill them every other run.

I used the small bottles for a few races. With the stop and shifter I went to the bigger bottle quickly. I have probably 6 small ones and a pair of 2.5lb ones as well as a mother bottle. But did not carry the mother bottle in the trailer. We used a small bottle in the dragster for the SLE. Stratus has a big bottle as it has SLE, Shifter, Shocks and Chutes all on air

10oz. bottle will run a shifter for a lot of runs. We ran a shifter and a stop charged in both directions. Would fill it every 40-50 runs and it wasn't close to being empty. You have to make sure the system doesn't have leaks. Don't overfill the bottle. It can get ugly.

I went to the big bottle so I could go all year and not worry about it. And yeah when those discs pop from the summer sun in the desert it will get your attention. Seen it happen a few times.

On a MSD 7531 using the yellow wire, when you program your gear change, where do you like the gear change setting at? This is a 3 speed trans.

Small block shifting at 7800. Gear shift point I'm guessing about 200 rpm's below shift?
Programming on the laptop, there's 2 places to set gear change and rpm drop?

Dave can you explain why it would go to ground and not to the 16 volt side?
When the desired RPM is hit, does the yellow wire have volts going thru it?