Internal Or External Wastegate Whats Better?  

OK the thing with turbo charging high compression motors to start with like the Toyota 4age 20v or a Honda B16a is they cant handle high boost on standard internals....well not for very long anyway.

What turbo charger are they giving u? kits can be dodgy man be really careful:)

Im currently turbocharging my Integra....ill let u know how it goes and ill post pics of the setup.

external wastegates can use up more room in the engine bay with bigger valves etc and therfore have slightly better control over the boost and this become important when your running very high boost in drag cars etc

internal all the way.
only time you run external is if you can't get the right sized internal one.

Be careful what you say. A 4A-GZE bottom end and a 20V head are actually a rediculously strong turbo combination. Not all engines are the same, some are built a lot stronger than others.

An internal gate you most likely control boost better since it is more in the direct gas flow than an external could end up. But you go to an external when the gas flow required to keep the turbo in check is great than the internal gate can flow.

How can this be true when an external gate has the capability of removing the excess gas before it has even passed through the exhaust wheel of the turbocharger and into the exhaust. You do understand they are piped into the manifold before the turbo exhaust housing, don't you? This would mean less restriction through the back of the turbo and the entire exhaust system....i.e EXTERNAL flows better. (Maybe thats why they generally use external for high HP applications?)

By your logic, what is the point of an external wastegate?

Sorry mate, but you are misinforming this bloke.

How can this be true when an external gate has the capability of removing the excess gas before it has even passed through the exhaust wheel of the turbocharger and into the exhaust. You do understand they are piped into the manifold before the turbo exhaust housing, don't you? This would mean less restriction through the back of the turbo and the entire exhaust system....i.e EXTERNAL flows better. (Maybe thats why they generally use external for high HP applications?)

By your logic, what is the point of an external wastegate?

Sorry mate, but you are misinforming this bloke.

You obviously fail to understand how a wastegate (any wastegate) controls a turbine.

---------I'm not the only one apparently

So the reason, like I said, you would go externally wastegated over internally wastegated is A.) the turbo you are using is not offered with an internal gate, or B.) is not offered with an internal wastegate that is large enough to flow the required amount of air, or can not be modified to make a big enough opening to flow enough gas.

---------So what you are trying to say is when an internal wastegate can't flow, you go external (because it flows better)??????? Sounds familiar....

Ohh and if you in fact refering to screamer pipes (external dump) then A.) you can add one to an internally wastegated turbo and B.) they only dump to atmosphere because most are too lazy/don't care enough/want the sik sound to plumb them back into the exhaust system. As long as your exhaust system is correctly sized it won't make a difference*.

--------So why the asterisk????? Your foot note makes my original point more eloquently than I ever could, cheers for that.

Ohh and I never stated how much power can be made, but as PSI999 has just said (and I reckon he might know a thing or 2 about that old corolla) with a set of wisco pistons and a shot of gas it made 430hp at the wheels. So given forged pistons are usually only really added to increase reliability and resistance to shock load from ping etc if would be a fair bet that you could made a significant amount of that power on a stock bottom end if tuned properly.

-----------Thats great, but the guy you originally corrected for saying to be careful using this combo actually used the words 'standard internals' in his comment, and as such I naturally assumed you were trying to tell him that standard internal stock bottom end 20valve engines could take big boost, read your post and you will understand.

*It does make a difference but that has more to do with how a turbine works rather than if you have plumb-backed all the exhaust into 1 pipe... IE drag cars run short 4-5 inch dumps off the turbo because it's the most efficient way to produce power with a turbo due to lotsa thermodynamic principles I haven't got the time to go into.

---------I'm not the only one apparently

---------So what you are trying to say is when an internal wastegate can't flow, you go external (because it flows better)??????? Sounds familiar....

What???? External is usually for bigger HP applications as they flow more, internal is like front wheel drive, simply a cost cutting & space saving measure..

--------So why the asterisk????? Your foot note makes my original point more eloquently than I ever could, cheers for that.

You do understand they are piped into the manifold before the turbo exhaust housing, don't you? This would mean less restriction through the back of the turbo and the entire exhaust system....i.e EXTERNAL flows better.

-----------Thats great, but the guy you originally corrected for saying to be careful using this combo actually used the words 'standard internals' in his comment, and as such I naturally assumed you were trying to tell him that standard internal stock bottom end 20valve engines could take big boost, read your post and you will understand.