How do I; add a blow off valve?

Hi Gang,

Progressing on my MX-6 GT project. Would like to add blow off valve, the car came with this TurboXS unit which had a third hose from the blow off horn to recirculate;

which I removed and installed a stock bypass valve in order to pass smog that looks like;

I don't really want to throw the TurboXS BOV back on with the hard pipe/hose configuration in it's current state as it looks dodgy as fork. The recirculating hose was jammed into the inner diameter of pipe where the horn would go, with screws from the outside drilled into the BOV body to secure the pipe (you can see one sticking out in the picture) and gooped all over with some kind of sealant. The hardpipe is too small or the hoses are too big and it's overall hack looking.

So how do I proceed? What parts do I need and where should everything be pointing?

Have you looked up diagrams for both of them? It should help you. Are you trying to recirculate with it or just relieve air?

Hey Ross,

I'm not sure what model I have for the TurboXS. I retract my question about where things should point, I think I have a grasp on that now, I was just worried since I've read about people installing them backwards. The OEM unit was pretty self explanatory to reinstall, it passed smogged and I don't seem to have any driveability issues so who knows. The aftermarket unit that came installed on the car isn't set up like most I've seen, even a google image doesn't show any being set up that way.

I'd like to recirculate but if there's an argument for venting to the atmosphere I would listen.

My thinking is I just need a better hard pipe that is the correct size and so that I can bolt the TurboXS to it in a more traditional way. It may not even work any better but at least it won't look so Mickey Mouse. The one I have now may have been cobbled together out of what the PO had laying around.

You need a valve to keep putting projects off until people stop asking you to do them?

DuctTape&Bondo wrote: I'd like to recirculate but if there's an argument for venting to the atmosphere I would listen.

One big reason you don't want to do that- how the controller calculates the air flow. If your set up uses mass air flow- then when you open the valve and vent that to atmosphere- it will still see air flowing into the engine and fuel accordingly. In other words, way, way, way too rich.

On our Challenge car, I was able to vent to atmosphere as it was a speed-density set up.

Here's a trick idea that I somehow got the patent on... instead of recirculating the air into the air stream- plumb it into the exhaust upstream of the turbo. The amount of fuel will still be rich, but the remaining combustion will happen in the exhaust- which theoretically will spin up the turbine well. This is similar to rally/race set ups that use propane to be an anti-lag set up. Not sure if it will work- we just submitted the patent, and a few years later, I got it. And since FoMoCo owns the patent, no harm in sharing it. It's not as if it's that unique.

Go to eBay and buy the correct mounting pipe. As stated if tthe car is MAF (paging swank...) Then it needs to recirculate. If not then you either recirculate or vent it for extra chu-chu.

From what I've read on the MX6 forums, it uses VAF/AFM and recirculate was recommended. I'm a total turbo newb (can you tell?) so apologies for any dumb questions posted previously or upcoming

Question: What does the TurboXS unit provide over the stock unit? Seems like you'd be fine with the stock piece (provided it isn't ruptured internally) and sell the TurboXS piece off to help with the budget, etc.

Put a duck call on the blow off valve.

turboswede wrote: Question: What does the TurboXS unit provide over the stock unit? Seems like you'd be fine with the stock piece (provided it isn't ruptured internally) and sell the TurboXS piece off to help with the budget, etc.

For fun. The stock piece is in good working order and you're right, it's probably fine as is. The inner ricer in me needs to hear noises.

alfadriver wrote: Here's a trick idea that I somehow got the patent on... instead of recirculating the air into the air stream- plumb it into the exhaust upstream of the turbo. The amount of fuel will still be rich, but the remaining combustion will happen in the exhaust- which theoretically will spin up the turbine well. This is similar to rally/race set ups that use propane to be an anti-lag set up. Not sure if it will work- we just submitted the patent, and a few years later, I got it. And since FoMoCo owns the patent, no harm in sharing it. It's not as if it's *that* unique.

Submit it before 1985?

Ojala wrote: Put a duck call on the blow off valve.

So I have EvanB's Miata on loan. It is very stripped, very light, very turbocharged, very nimble, VERY fast, and it has a blowoff valve that is very prominent.

I want to put a whoopee cushion on it. Words cannot express the visceral need that I have for this. It would be like a mobile version of the campfire scene from Blazing Saddles.

In reply to Knurled:

I'm sure some of the details were shifted- as it was submitted maybe 8 years ago.

edit- just looked again- could not find that one, but one where we inject on an open exhaust valve to spin the turbo. This is with DI, so... Granted in 2013.

In reply to Knurled:

A BOV duck call is obscenely loud, I cant imagine how loud and annoying a fart whistle (?) would be.

In reply to Ojala:

That'd be the plan. Hopefully it would be so loud and hilarious that corner workers would not notice all the cones I'm hitting.

In reply to Knurled:

I've been meaning to do a train whistle or duck call but just haven't got around to buying one yet.

In reply to EvanB:

I have... supplies with me. To be honest I haven't had time to do anything with the car besides getting it aligned (he said everything went easily to spec, he went to OE alignment spec per my instructions), the [redacted], and putting the skidplate back on and putting a correct size hose clamp on the turbo oil drain (ahem ) and removing the boost controller.

8psi is a lot less fun than 15psi OH E36M3 LET OFF. Now it only feels as quick as my car. But I can't stress enough that your car goes where you point it, my car goes where you aimed it...

Oh and I bought a cigarette lighter/USB power port. I ran a pair of wires from the battery through the firewall to the cabin and I duct-taped my new Pioneer stereo to the floor and I'll just give it VW style power. I'm NOT driving eight hours with no tunes!

Turbo enflatulator has been installed.

Switch to MAP plus MegaSquirt, vent to atmo, let the naysayers be dammed

In reply to Knurled:

I'm anxiously awaiting video proof.

In reply to Spoolpigeon:

It's more of a rubber glove that I cut holes in the fingertips and ziptied to the BOV outlet. We'll see if it lasts the drive out to Lake Odessa. There's remarkably little room to install a glove onto a HKS style unit...

Like anything I do, it will either be hilarious or it will fail instantly. On rare, special occasions, it's both.

Test out that Turbo XS blow off valve before you decide to keep it. When they first came out, a few of my friends put them on their DSMs. When we pressure tested the system for boost leaks, we found that every one of them failed to seal, and they leaked badly after only a few psi. The stock valves were leak free until about 15psi, and leaked much less at 20+ psi than the Turbo XS did at 5psi. Now, this was probably 15 years ago, but they were such crap that I'd never put one of their parts on my car.

In reply to Boost_Crazy:

You have to put washers in to shim the spring. I had a rfl on the van and it held 20 with no problem.

Failed instantly... Oh well!