Why would one ever use the single piston, at the same price? School me on the pros and cons, please.

No idea but been running mine for 3 years now. The only thing i've replaced has been the Orings but those are 30 cents a piece, 2 total.

Single piston is 10 bucks cheaper. It's also simpler so less failure points. Also the secondary piston blocks some air flow on cars that matters. I dont know if there is any difference in the design of the main piston.
This one basically behaves like the Tial bovs. It's completely open at idle, and deceleration and partly open at cruise.

I was gonna say: on some cars you actually want it open at idle.

Our cars are not those cars though, we ditch the maf as the 1st order of business :party:

Come on guys I can't believe you aren't answering the important questions here.



Like can I put a duck call on it?

Duck call? Not on the VTA forge. Those are pain in the ass to modify since theres holes in all directions. You need something with a nasty hole like the diverter valves.
http://www.forgemotorsport.com/conte...oduct=FMDV006A

You can however put the inner tube on your exhaust and sound like an F1 car at times.

you'd need a bpv style for that :giggle:

Oh man oh man, I'm so putting a duck call in my eBay one before I swap it!!

Anyone try "Go Fast Bits" TMS BOVs?

I am considering something like this: http://www.gfb.com.au/products/blow-...730-817-by-gfb

Basically it's an adjustable BOV that goes from full VTA to full recirc. Mainly I like the idea of recirc for stealthy reasons but I like the ability to go full VTA if I want.

Am I being stupid?

gfb is pretty nice too

I honestly don't see the point of that though: on a car that routes the air back into stock airbox, and it is truly stealth, that would be cool. but on our setups, the difference between the settings would be loud and LOUD. Neither would truly be stealth...IMO

You can use a foot long rubber hose that will still be VTA however it will be quieter because of the additional tubing. Basically you'll get just an air rushing through noise instead of a pss.

It's a nice bov but imo it's useless for us guys that are running a map sensor and dont care about recirculating. The extra cost is only good for the MAF setups that go wonky.

IMO the Mach 1 is a better choice if u want to go that route

GFB unit looks like quality imo. Aside from MCM, I havent seen too many in action. Having the ability to go stealthy or vta can be a plus if you want the best of both worlds where as others dont care of the sound and just recirc. I would choose the manual adjustment vs the electronic motor.

Also, It looks like it would be a great fit for a begi pipe style bov replacement :bigtu:

I've owned a car with a GFB valve on it. Seriously the loudest thing ever. You drive your 200hp Miata around feeling ashamed because you're making noises that would shame a 1000hp Supra.

It is. FM used to use them on their kits before moving to Turbosmarts.

Just ordered the Forge Dual Piston with side mooted vacuum hose inlet. Should be perfect for my setup, made in UK, and only $150 out the door after shipping. I'm pretty satisfied already, I figured I would be spending $250+ on a Greddy or HKS!

Do you have a link by chance? Can't seem to find it anywhere.

Edit: Just kidding I found it.

Lol dude, I was gonna say, epic Google ninja fail.

Since I already copied the link, for anyone who is lazy: http://www.forgemotorsport.com/content.asp?inc=product&product=FMDV004A_[New%20Code]-[New%20Code]

Definitely will last longer than the condom diaphragm bovs.

True, but then you won't get the warming or cooling sensations.

I bought Vlad's Forge.... Haven't finished my motor yet but I can't wait to see how it sounds!

https://www.miataturbo.net/attachmen...ine=1411696566

you know its gon sound extra sexy just cause it was mine :dealwithit:

As someone said long time ago.. it sounds like an alien giving birth.

Sounds kinda like that but this is a bad video. You can however hear the harmonic pew going off. If you like it, do not touch anything on the holes. On the other hand if you want the regular ol air compressor sound you can enlarge them. Wish i had known that before i chopped mine up.