i'm in for at least 3

Count me in for one.

Mark, maybe you could cross-post this on the 912BBS too

When will we learn more about this?

I'm in for one.

Count me in too for 1.

Price? Or did I miss that?

+1 please

+1 for me

you missed it.... " NEW Group Buy 914 Master Cylinders $110 each" .... hidden in plain sight.

I want 1 too, or 2 too, maybe.

I also am in for one

I think there was another thread recently cautioning against getting a larger master cylinder with the stock calipers. IIRC, the problem was that braking becomes less progressive. My gut tells me 17mm to 19mm is probably OK, can someone share practical experience?

When you install a larger master cylinder, you reduce your "hydraulic advantage" over the caliper pistons. It's almost exactly the same effect as moving the pivot point of the brake pedal.

The 19mm M/C has 25% more area to the piston than the 17mm one does. That means to get the same clamping force at the calipers, you have to exert 25% harder, though the pedal moves 25% less distance.

Most people seem to agree that the 19mm is a reasonable swap, but going up to 23mm (which I believe the earlier thread was talking about) is a Very Bad Idea unless you are significantly upgrading the caliper piston sizes.

--DD

I would also be in for one

I'm in for one for sure...maybe put me down for two.


I don't think you'll have any trouble getting rid of the extra one if I don't take it.

I'd be in for a 17mm.

I'm in for 1

If I get the jist Mikey (Mark) trying to put together the numbers for a fair size production run, so he's likely he's going to only be able to do the one size, 19mm.
19mm was likely chosen as it's the best size for a large enough production run to re-coop his investment from both the 914 and 911 crowd.
Likely he can't get the same per unit price on smaller runs for different sizes.

That is what he says back in post 38.

Guess I should have quoted. i assumed 17mm would be covered at some point. Can't you just sleeve the cylinder down to 17mm? I obviously have no clue.

"I would gladly pay you today for a 17mm on Tuesday."

These will be 19mm.

Progress is that we are working on the tooling for the casting now. We have located a new ATE sample and are reverse engineering it. There are over 20 parts we will need to fabricate to make this we have 3 done at this point. Just like making a V2 rocket, but we will be doing some extensive testing on it to. It's being made with under our new manufacturing division. It will be a fully engineered part.

I'm in

+1

+2

Add 1 to the list for me.

me likes new parts...even more when they are improved....
in for 1...

Mark I'm in for 1 if they are still available ?!?!

Actually not ready yet. SO no problem.
Mark

Dave,
My car has the Brembo Boxster calipers up front, not sure if the MC was ever changed. My petal is still soft after many bleedings and purgings. You think a 19mm is a good choice? Or 23mm that came w boxters?
I have stocks w V kit in rear
Just curious

T

Mark
Not to beat a dead horse,....but......any word on weather you might tap the reservoir hose holes for actual fittings? My MC is brand new and works well besides that,(it leaks). If you tap those I'm in, otherwise I can't really justify buying another. Any info would be great.

Thanks again for all you do for us!

interested in one, local, live in Tigard.
Cheers!

We have a better solution for these that when available you more than likely will want. Unfortunately, since we are actually doing testing on these and the number of parts required to make these means we have to work on it one at a time. It will be awhile before these are available.

Count me in for one as well.

Eugene

Could you give any more insight into improvements? If it's too early in the game I understand.

+1 please

I'd have one too please!

If I didn't put my name in the hat, I am now..
Wes

I am in for one.

The Boxster MC will be boosted. Without a power assist, you may find that the 32mm one requires a large amount of leg to activate.

I don't know what the piston sizes in the Boxster calipers are like compared with the stock ones. It's good to keep near the stock ratio of total caliper piston area to master cylinder piston area, but I don't know the specific numbers for your case. But that should keep the pedal effort near stock.

--DD

I am in for one, too.

Steve

I'll need one too. I'm reworking all brakes as I complete the five lug upgrade and refresh the suspension. Just over a year on the jack stands... Count me in.

I'm thinking I'll be in for one by the time they come out. Why so early in the process, is the GB more for gauging interest than economics?

Any news on progress, improvements, and how far out on these? Excited about the ugrade and planned improvements. I hope the connection for the reservoir lines is one of them!

Yes some progress, but there are many parts we have to make to get these done, I'd like to say they will be ready on X date, but it's a dart in the calendar at this point. I can say by end of summer (or before) I will have a needed related item.

Thanks for the update. I missed this the first time around. +1 for sure.

Cool, video the testing while you're at it, no doubt everybody would like to see it.

Boy if these have some better arrangement for the supply lines I'd be in for 2. I absolutely HATE getting those damned lines to fit and get the rubber connections and washers in correctly, especially without removing the gas tank!!!!

We will be sending these parts out for independent testing. So maybe, I would expect these will be poles of documentation