[gavinsan]

Hi guys is it possible to have a dump valve for the M2 with the sneeze noise each time you change gear or let off the throttle after spooling the turbo ?

[gmzanatta]

Why?

[six-n-twins53]

A lot of modern turbo cars don't run well with those.

[Aronis]

Go get a Subaru!

LOL, JK.

Some turbo cars have pop off valves in their design and thus vent extra pressure off into the atmosphere, while others have diverter valves which do not vent the pressurize gas to the atmosphere but recirculated it. When you let up on the gas that spooled pressure has to go somewhere.

The Benz CLA (and it's lesser cohorts) uses a pop off design and when my friend's car vents the extra gas it's a very loud and frankly unsettling noise. Same with his WRX STI. Both of those cars are heavily modified.

I don't think the M2 does that.

Mike

[atxsk8r]

This brings back memories of my Honda days when kids wanted to add a turbo kit just to hear a blow off value go off LOL.

I swear every time a Subaru drives by me on the road, they have to shift right next to me so i hear the blow off value

[DivideBYZero]

The M2 has a recirc dump. You can hear it, especially if you have changed filters.

I used to have a Subaru with a Forge VTA Dump. I wouldn't want it on my M2.

[Aronis]

There is a lot of money to be made selling aftermarket diverter valves and what not, which add no measurable performance but 'look nice' in the car. They are not very expensive as parts go and very easy to swap out. So it's more value as a "hobby" item than as a real performance part. If I need new diverter valves because my 14 year old originals failed, I guess I get some from ECS for the bling then! The originals are about $65 and the bling ones are about $85 each.

I must say the sound that is made by the maxed out CLA45 when it vents boost is insane. Not my kind of ride.

Mike

[UltraMagneticAL]

get a turtle instead

[ChrisK]

Please don't add a blow off valve. ...Even if you could

[gavinsan]

I didn't ask if you guys approved or not just if anyone knew of a valve that is fitted to an M2

No worries

[mrcheezle19]

Look at synapse, they make one. Or just run a spacer for like 100 bucks.

[Zippster]

my knowledge here is sort of dated, so some things may have changed, but I think it's called a waste gate, my understanding is that they need them to cut off boost at a certain PSI or bad things can happen like engine knock, and blown head gaskets. In aviation they monitored Manifold boost pressure so in an emergency situation they could over boost the engine those engines might not have had these gates. Cars not so much at least I think all turbo superchargers and belt driven supercharged cars have them.

So you don't need to add one, they must manage any overpressure already.

[UltraMagneticAL]

Originally Posted by Zippster

my knowledge here is sort of dated, so some things may have changed, but I think it's called a waste gate, my understanding is that they need them to cut off boost at a certain PSI or bad things can happen like engine knock, and blown head gaskets. In aviation they monitored Manifold boost pressure so in an emergency situation they could over boost the engine those engines might not have had these gates. Cars not so much at least I think all turbo superchargers and belt driven supercharged cars have them.

So you don't need to add one, they must manage any overpressure already.

waste gate is different from the blow off valve. like you said, the waste gate will open to prevent overboost situations by venting exhaust gasses around the turbo. a blow off valve is a device that helps vent boosted intake charge out to the atmosphere when the throttle body is suddenly closed, preventing boost pressure to push back against the compressor. in the m2, we have a diverter valve that recirculates the air back to the airbox when the TB is closed, so no need for a blow off valve.

[Zippster]

Originally Posted by UltraMagneticAL

waste gate is different from the blow off valve. like you said, the waste gate will open to prevent overboost situations by venting exhaust gasses around the turbo. a blow off valve is a device that helps vent boosted intake charge out to the atmosphere when the throttle body is suddenly closed, preventing boost pressure to push back against the compressor. in the m2, we have a diverter valve that recirculates the air back to the airbox when the TB is closed, so no need for a blow off valve.

Thanks for that explanation.

[ddk632]

Interesting thread. On my way to PetCo now to look at some turtles.

[UltraMagneticAL]

Originally Posted by ddk632

Interesting thread. On my way to PetCo now to look at some turtles.

i prefer the chicken

[ddk632]

^^

I can't even... it sounds like it's being raped... oh man!

[R0ME0]

To help the OP out FORGE Motorsports makes one. Contact them. Install is a bit more involved but achievable yourself at home.

[ashburyn54]

If you get an aggressive open element Intake you will get 50-100 percent what your after. Small flutter too

[Twix]

Originally Posted by UltraMagneticAL

i prefer the chicken

Kinda sounds like Seth Rogen lol