so i was getting my turbo set up list ready for a when i start buying the parts really soon and came across a question i couldnt really find an answer for. so i know i want to get a evo3 for my gst but wasnt sure if it should have a internal or external wastegate. its going to be a daily driver but also a part-time track car every now and then for fun. and if i do go external, is it better to have to wastegate on the o2 housing or the header?

 

well an external would be better in any situation because it eliminate's boost creep... you could get away without one with the evo3 but if you have the money i'd say why not, right? as far as where you mount i would probably say on the header, even though i'm not sure if it makes a difference...

 

external is definetly better. If you have the money then i would do it. But obiously its alot more money because you need to buy the wastegate, and manifold that can mount the wastegate up to and then the dump tube either to the atmosphere or welded back into the exhaust. And you have to have the wastegate on the manifold. Because it has to be able to dump the air prior to reaching the turbine

 

oh duh, haha my bad... and you can have a outlet welded onto ur stock manifold for the wastegate

 

What kind of boost will you usaually be running? I just installed an E3 2 months ago, I upgraded to 34mm wastegate and ported the turbo and it runs great, I am on stock fuel so I am at 15psi, I have 0 boost creep, if you are going to run over 20 all the time it doesn't matter but the stock wastegate is fine.

 

why do i hear that all the time, that it doesn't matter if you're gunna run aboe 20 psi all day long,everyday? just cuz you got enough force that boost creep gets eliminated? and yeah i conqur with everyone, i have a 16g and if i had the money i'd go with an external wastegate,might as well

 

Becuase due to the theory of fluid dynamics when you run under 20psi the exhaust is going to mostly go through which ever hole is easier to flow through but at higher PSI it comes to an equilibrium where you are pushing hard enough to overcome that.

 

way to try and sound smart

 

haha, he looked that sh** up somewhere to sound smart
and yeah if you go that route it's a good idea to port and polish and install a 34mm flapper if you get an internal wastegate

 

College Physics Baby Wooot![8D]