external and internal wastegates

deadlikeme Posted a lot Posts: 1,022	external and internal wastegates deadlikeme @chrizturboimp
	Dec 26, 2006 18:50:02 GMT Select Post Deselect Post Link to Post Back to Top
	Hey all, Iv got myself a bit confused Iv got a T2 on my imp but I am going to put my T25 on instead, all good to now and I know both have internal wastegates. But whilst performing the swap over I was thinking of including a external wastegate (mainly cos I like the sound they produce ) but the problem I have is I don't know (cant find on the net) infromation on their application i.e can I use my turbos which have internal wastegates as std with an external wastegate? I have a plan for the extra piping which will allow a smooth flow off, just don't know if I need a different turbo, use mine as is or modify them? Please help!!!! Chris


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Blown_Imp Posted a lot [][][*] Posts: 4,842	external and internal wastegates Blown_Imp @blownimp
	Dec 26, 2006 19:32:10 GMT Select Post Deselect Post Link to Post Back to Top
	You can use the T25 with an external wastegate, but you will have to keep the old internal one shut either by welding it or replacing the actuator with a solid rod. Its not the ideal solution though, a specific housing should be used really as an external wastegate is used to smooth the flow into the turbo and the wastegate. In a normal turbo the exhaust gasses have to make some pretty sharp turns to bypass the exhaust turbine, as the boost gets higher and the exhaust gas hotter and higher in volume these sharp turns prevent the gas bypassing, causing over boost. The solution is to use an external wastegate, this lets the exhaust gas flow smoothly into the turbine and the wastegate seperatly. Also as the oulet for the turbine and wastegate are seperate the gas isnt impeded from escaping from the wastegate, again improving the performance. So in a word, yes, but it isnt ideal Cheers J
	Celica ST205 - Being turned into a 550bhp monster :D Gearbox Kart - For Sale!

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deadlikeme Posted a lot Posts: 1,022	external and internal wastegates deadlikeme @chrizturboimp
	Dec 26, 2006 19:38:39 GMT Select Post Deselect Post Link to Post Back to Top
	If i can do that with the 25 why cant I do it with the t2? Cheers J I had a feeling you would reply! ;-) Chris


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Blown_Imp Posted a lot [][][*] Posts: 4,842	external and internal wastegates Blown_Imp @blownimp
	Dec 26, 2006 19:54:46 GMT Select Post Deselect Post Link to Post Back to Top
	you can do it with the T2 aswell
	Celica ST205 - Being turned into a 550bhp monster :D Gearbox Kart - For Sale!

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