[stg3MB335i]

Before i bought my 335 i had 2 e46 M's and a turbo e36 m3, one of the biggest things i liked about that car was when i took off, the external waste gate sound dumped into the atmosphere. Sounded wild! Was wondering if it was possible on the 335i. If so how hard would it be and what're some other members outlook on the idea?

[akotten]

Yes, you can convert to a BOV (Blow Off Valve) that vents to atmosphere instead of the original diverter valves that dump back into the system. However, diverter valves are better for performance, and also most people prefer them because they are quieter....BOV are too much rice for me.

Unless you mean the actual wastegate that dumps exhaust. But I'm pretty sure you are talking about the diverter valves that dump the intake manifold pressure, no?

[TheStig]

I Brang this up a while ago. With no reply GL.

[PlutoniumTans]

Originally Posted by akotten

Yes, you can convert to a BOV (Blow Off Valve) that vents to atmosphere instead of the original diverter valves that dump back into the system. However, diverter valves are better for performance, and also most people prefer them because they are quieter....BOV are too much rice for me.

Unless you mean the actual wastegate that dumps exhaust. But I'm pretty sure you are talking about the diverter valves that dump the intake manifold pressure, no?

He's talking about waste gate not not dv's !!!!!!!!!!

[akotten]

Originally Posted by PlutoniumTans

He's talking about waste gate not not dv's !!!!!!!!!!

OK calm down. I kind of thought so, but I've seen soo many threads where people get them mixed up. Yeah....open wastegates might be a little fun haha.

[GQ335i]

Originally Posted by stg3MB335i

Before i bought my 335 i had 2 e46 M's and a turbo e36 m3, one of the biggest things i liked about that car was when i took off, the external waste gate sound dumped into the atmosphere. Sounded wild! Was wondering if it was possible on the 335i. If so how hard would it be and what're some other members outlook on the idea?

I would love to know this as well. I've been wondering if anybody has done this yet.

[jb's335]

Because of the funky positive pressure stock wastegates you would have to go full standalone to use your own boost control system, IE running aftermarket wastegates. The stockers have the wastegate in the bellhousing of the turbine so it would be really hard to make a pipe that directed the wastegate flow to the atm. If we had the conventional 5 bolt exhaust turbine outlet then you can usually get a diverter made that can section off the downpipe into a downpipe and screamer pipe (wastegate pipe open to atm), but we don't.

[subieworx]

Or just weld external wastegates to the manifolds and run a dump tube with an exteranl boost controller.

[stg3MB335i]

weld external waste gates to the mani? they're cast i believe an unable to weld to. I'm having the turbo"s upgraded soon, and am taking the mani's/turbos off myself, at this time I'm going to look into trying to fabricate a dump tub that will dump out and down the side of the down pipes, probably two, 1 inch steel tubes, off each DP at the very top on the side of the waste gate dump. I have a welder and pipe bender so this should be fun. Actually surprised no one else has attempted this yet, Just can't get over the noise my e36 turbo M3 made when i opened up my waste gate to the atmosphere while hitting boost. Beyond awesome. Any educational input on this project before i start would be greatly appreciated. Thanks.

[rader1]

It is possible to weld cast, but you've got to know exactly what you're doing and be one bad mofo lol
i agree that waste gates that dump to atmosphere sound intoxicating so good luck with the project

[Haus_07]

I'm not quite sure if I understand what your after here?? I get the dumping exhaust from the wastegate to the atmosphere, but when?? Before the wastegate closes, or when it's closed and directing exhaust to the turbo....then to the atmosphere? Wouldn't you be dumping raw exhaust past the o2 sensors??? Please explain.....

[C4sF80M3]

It is possible, but not easy. You would need to move to an aftermarket turbo with no internal wastegate, or bypass the stock wastegate by welding it shut, then welding in a wastegate pipe and wastegate at the manifolds. At that point you would have to convert to a boost operated wastegate controller.

[stg3MB335i]

Haus 07- What I'm trying to do here is convert my internal waste gates "comes stock on every 35 series" what you have now is a little flap inside the turbo to downpipe flange that opens and closes to control the excess exhaust that creates boost, "internal" as i just explained opens and lets the excess exhaust out, But out as in out of the exhaust turbo hot side down into and inside of the downpipe. So you can't really hear anything over your main exhaust. Now, external is a bit different; in the means of the exhaust NOT being directed down the downpipe while hitting boost, An external waste gate sits right before the turbo somewhere on the manifold so that when the vechical hits boost the exhaust before the turbo that's about to make your boost is then directed out before it hits the turbo to control the boost levels. At that point most people will have a 1 inch OD pipe "roughly" welded or flanged to the external waste gate to then direct the excess exhaust down to the bottom of the car usually right next to the exhaust. But by connecting a small tube with forcefull exhaust jamming out of it to control the boost you get a wilddly awesome exhaust sound that most people with boosted cars loveee to hear. That's if you don't re-direct it back into the exhaust system. Hopefully that gives you a better idea on what im talking about now. I know, I'm horrible at trying to explain these kinds of things in writing, but if you still don't undertand i'm sure there's some videos on youtube or something with an external waste gate in action.

[stg3MB335i]

And by the way, how do you like the GODspeed FMIC, usually don't like going cheap, due to "you get what you pay for" but everything i've heard so far about them has been nothing but good. So just thought i'd ask. Thanks.

[asian010]

vroooommmm... BYAAAAHHHHHHH

[thebigragu99]

Honesty you guys are clueless about this thread.To make this mod work it will take alot of time and money.fisrt off ,you need to mod the down pipes,add external gates of your choice ,tac weld the flappers shut on the turbos,and retune the car.The main reason for this mod ,is to regulate boost control properaly!!

Yes the sound is awesome but by the time your done with this mod,you could have called rob beck for a set of some wild turbos from him!I would love to see someone task this,ithe gains could peak aound 20 whP or more.

[stg3MB335i]

Already just bought Comp upgraded turbos, they only made about 10 sets of them, but very well made turbo and good amount bigger then stock, both cold and hot side, this is why i'm trying to go external, and it' something different. No offense at all to you, but i have a pretty good idea on how external gates work. And yes, i will be modifying the DP's. I have used Tial in the past, and worked great when i turbo'd my e36 M, so most likely going to stick with that brand.

[thebigragu99]

Originally Posted by stg3MB335i

Already just bought Comp upgraded turbos, they only made about 10 sets of them, but very well made turbo and good amount bigger then stock, both cold and hot side, this is why i'm trying to go external, and it' something different. No offense at all to you, but i have a pretty good idea on how external gates work. And yes, i will be modifying the DP's. I have used Tial in the past, and worked great when i turbo'd my e36 M, so most likely going to stick with that brand.

Cool story!

[Rikx1M]

so what happened to this project?

[langsbr]

They all bought single turbos when they wanted an external wastegate.

[Miller335]

They went to honda for their external wastegate needs.

[HawkeyeGeoff]

Basically you'd need to go single turbo, weld the IWG shut (or have an exhaust side without one), and just run one off some kind of aftermarket manifold. I'm sure there's more that goes into it with all the vacuum systems as well.

On previously 4cyl platforms almost everyone ran 44mm EWG's just so they could keep boost under control; garrett IWG's tended to be very hard to control consistently for example.