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Can you run a wastegated manifold on an internal turbo?

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Old Apr 24, 2006 | 12:15 PM
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Evolution8Blue's Avatar
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Can you run a wastegated manifold on an internal turbo?

I was wondering if i could order an external wastegated manifold and put a wastegate on it but not hook it up and run the car till i decide to upgrade the turbo?

How would i do this if you can?

Cause i was to do a custom kit but i cant afford it all at once soo
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Old Apr 24, 2006 | 12:18 PM
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I was thinking about ordering a nice manifold then using the stock turbo for alittle bit.
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Old Apr 24, 2006 | 12:32 PM
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Dont most of the larger than stock turbo upgrades have a different footprint than the stock turbo and the bolt holes on the mounting flanges wouldnt line up?
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Old Apr 24, 2006 | 05:11 PM
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No, any t3 manifold will work.
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Old Apr 24, 2006 | 11:21 PM
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What you can do is weld the internal gate closed and just use the external on the manifold if you want.
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Old Apr 24, 2006 | 11:36 PM
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From: CT
Originally Posted by Petey Turbo
What you can do is weld the internal gate closed and just use the external on the manifold if you want.
+1 ... You can do what this guy says. However, if You are asking if you can buy a manifold set up for an external gate, and just run it like that with factory turbo and do nothing else... I hope you are not assuming you could do that without putting the external gate on with it (Otherwise, you'll have a bit of a hole in the manifold where a wastegate should be, lol).
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Old Apr 24, 2006 | 11:45 PM
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I got me a twin wastegate Evo. Its the fastesst evaar!
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Old Apr 24, 2006 | 11:52 PM
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From: CT
Originally Posted by boomtown
I got me a twin wastegate Evo. Its the fastesst evaar!
Statements like that just make you seem like a moron. Now because of you, I feel dumber... Everone in this thread infact will probably feel dumber... kthxbye
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Old Apr 25, 2006 | 12:09 AM
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Ok how about an intelligent statement then.

Hooking up a larger externally gated manifold to your stock turbo may actually make your car slower because you are going to lose exhaust velocity in exhaust runners with an increased volume compared to stock. Your turbine runs on heat energy and you have to be very careful not to waste it. Its the same as increasing your A/R - what you gain up top may not compensate for what you lose down below. The stock manifold is tuned to the stock turbo - a larger manifold will not have the same efficiency in the midrange on a stock turbo.

Now CTsilver you can feel smarter again and it will all average out.
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Old Apr 25, 2006 | 12:13 AM
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Just put a block off plate on the manifold.
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Old Apr 25, 2006 | 12:13 AM
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From: CT
Originally Posted by boomtown
Ok how about an intelligent statement then.

Hooking up a larger externally gated manifold to your stock turbo may actually make your car slower because you are going to lose exhaust velocity in exhaust runners with an increased volume compared to stock. Your turbine runs on heat energy and you have to be very careful not to waste it. Its the same as increasing your A/R - what you gain up top may not compensate for what you lose down below. The stock manifold is tuned to the stock turbo - a larger manifold will not have the same efficiency in the midrange on a stock turbo.

Now CTsilver you can feel smarter again and it will all average out.
I can accept that statement. That is something that is helpful to anyone who reads it and didn't know that and is good information in general. Thank You. Have a drink
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Old Apr 25, 2006 | 07:00 AM
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Just for sake of argument....maybe a twin-gated, single turbo setup isn't all that bad of an idea. That is: the integral wastegate backed up by a second, remote gate. In some cases a balanced, dual wg setup lets the turbo spool faster because you can adjust the wg actuator rod as tight as possible, almost to the point of bind, so that the wg puck doesnt start to lift off its' seat whatsoever, until, lets say 21#, and then you set the second, larger, remote wg to open at 21.5#. The turbo spools faster right up to your preset boost limit w/o any premature venting out the exhaust housing's bypass port.


It probably does seem crazy, but, if you think about it, when you rely solely on the stock integral wg with its weak actuator spring, eventhough you set the wg to limit boost to, let's say 21#, the wg puck is already starting to lift off its seat way before 21#, at let's say.... 11#. This premature lifting of the puck off of its seat tends to slow down spool, because it vents gases which should be spinning the turbine wheel.

Last edited by sparky; Apr 25, 2006 at 07:54 AM.
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