Unless you trying to squeeze every last WHP out of the car, i see no real need for dumping to atmosphere. My old turbo cars did and I, personally, did not like the sound. I prefer the spool/whistle of the turbo, but that’s just me.
All the people I know that run a dump do so because they like the sound, not for performance reasons. We all run smaller turbos, so no real need, IMO.

 

Alright that's kinda what I figured, I'm OK with loud but external dump might be pushing it for me so I'll likely stick with recirculating. Thanks

 

could be worse. at least you don't live in CA

 

Thanks for all the feedback! I live in Portland so im not worried as much about the crazy emissions like CA, but just was wondering any cons of running an open dump on the daily lol

 

And personally I love the sound So i guess its all good!

 

With a dumped O2 housing you can run a more restrictive quieter exhaust and daily drivingwill be much nicer. Than under load since up to 50% of exhaust volume can be dumped out the wastegate yummy don't lose power from restriction in exhaust. A recirc O2 will need a free flowing exhaust because all of it goes through the exhaust. This will make the car louder all the time and make daily driving get annoying. I have a quiet exhaust and a hood dumped wastegate. I love it.

 

I bought my car with the dump and exhaust already on it but mine is set up the same way. My current Evo is way quieter in daily driving than my previous one which had a recirculated O2 with larger piping and muffler.

 

50%?? holy crap, how big is your wastegate??? :P
turbo cars like open exhausts. i don't think an open dump would make that much of a difference unless you are running a very large turbo. even still, i've never seen one vent near 50% of exhaust gases.
a more restrictive exhaust is still going to be more restrictive. i'm basing my opinion on my experience with turbo cars (varying turbo setups on different cars).

 

I have a TiAl 44 wastegate. I got the 50% number from some reading I did somewhere. I think Robert from FP had stated that at some point in time.

 

i've seen some dual WG setups where the dump tubes could dang near equal the diameter of the exhaust. so i suppose it's possible.

all this is one reason i stick to stock-framed turbos. once you start going with a crazy setup, it never ends LOL. i've been down that long, long road once before.

 

I had a MAP O2 dump on my 8 DD and I didn't mind it at all, cops on the other hand didn't appreciate it

 

I have an open O2 Dump in my Evo 8 straight out the hood, I personally love it especially when hitting boost, not to mention nighttime fireworks.

 

My Evo has an open O2 dump out of my hood, what kind of problems did you get with the cops? It is my first Evo so I am new to this game. Did you enjoy the O2 dump?

-Jose

 

My car is already tuned with a tbe, intercooler, and intake. If I get an o2 dump will I have to retune? If I upgrade the exhaust manifold later on, I'll have to get another o2 dump correct?

 

Possibly (depending on your setup and tune) and no.