Internal v. External

[RonRacer]

Hey my boosted buddies. i'm almost done with the planning and mapping phase and is about to start the purchasing phase. but before i finish my gorcery list i was wondering if someone could tell me the advantages/disadvantages of internal vs external wastegates??

[Kurobei]

Hey my boosted buddies. i'm almost done with the planning and mapping phase and is about to start the purchasing phase. but before i finish my gorcery list i was wondering if someone could tell me the advantages/disadvantages of internal vs external wastegates??

With a external wastegate you can run more boost safely since it's not part of the Turbo itself. You have lots of different brands and sizing options 38mm+ etc. and you can run different springs to regulate the exhaust gasses.

With a internal wastegate, once you go past the sufficiency of the turbo itself, the internal wastegate built onto the turbo more likely won't be able to handle the increased exhaust gasses pressure depending on how much boost and power you will be making. This is where the external wastegate comes in.

If you plan on throwing something on like a Greddy Turbokit or oem DSM setup, these systems are internally gated and not meant for too extreme HP numbers. Most often times, people get "boost happy" and up the boost much further than the whole turbo system can take and end up grenading their engine due to boost creep. Boost creep is not something you want.... Run a properly sized external wastegate and you will be happy.

[RonRacer]

so are their any advantages to an internal at all then???? and what are we saying "extreme hp numbers" are?

[93F22A6]

Can you run both? Not that you would want to but is it possible.

[bcjammerx]

sorta like running two blow off valves? Seen one mag do that...said they wanted to "over do it" cause they didn't want to blow the engine.

Would running two waste gates be safer?

[rexload]

I think instead of spending the time and energy to put in two wastegates, it would be better to just get ONE quality wastegate. plus all modern engine management systems have a boost cut feature which should save your motor if your wastegate fails

[rexload]

so are their any advantages to an internal at all then???? and what are we saying "extreme hp numbers" are?

the only advantage to running an internal one is that it is cheaper when you are doing a DSM setup for example. i would say when you are getting close to 300 flywheel hp, you should start thinking about an external wastegate.. but it depends on the setup

[bcjammerx]

cheaper is not better...go with quality external then

[93F22A6]

You can by pass the internal gate correct? Then you can use an external and be set.

[NAiL05]

Internal is nice that since it is easy and cheap...But I prefer an external...Its easier to maintain and service. The external is also more reliable than the internal setup. Plus allowing you to take out the external WG allows you to change spring pressure if necessary.

[d112crzy]

Internal is nice that since it is easy and cheap...But I prefer an external...Its easier to maintain and service. The external is also more reliable than the internal setup. Plus allowing you to take out the external WG allows you to change spring pressure if necessary.

Not really. I've seen much more consistency with OEM internal wastegates than I have with Chinese external wastegates. Those(Chinese) fluctuate like a mofo.

There's no point in running to waste gates on a single scroll turbo(especially if you're gonna do internal and external). One lets pressure out from the manifold, and one from the turbine. If you use both together, it's possible that both will try to open at the same time and will loose too much boost. Kinda like running a HUGE single wastegate at lower boost pressure, they're inaccurate and boost will fluctuate.

Run a quality external wastegate. But if you're doing a cheap dsm setup, there's no need for one.

[NAiL05]

We have a china 60mm imitation HKS on my friends car...works 100x better than the synapse which is pretty sad. Depends its a hit or miss with the chinese externals. Usually I would recommend name brand but HKS externals are not cheap.

[civic_90_08]

We have a china 60mm imitation HKS on my friends car...works 100x better than the synapse which is pretty sad. Depends its a hit or miss with the chinese externals. Usually I would recommend name brand but HKS externals are not cheap.

Tial?

[NAiL05]

Tial is nice thats what my buddy had before he sold his. He just needed a bigger gate and Tial was up there...So he bought the HKS for 100 bucks lol. . I have a few buddies running XS power 46mm also. But i would recommend name brand for high dollar builds and reliability.

[bcjammerx]

wouldn't a quality external be better than OEM internal as far as overall safety?