Can you run a wastegated manifold on an internal turbo?
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
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
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.
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Originally Posted by boomtown
I got me a twin wastegate Evo. Its the fastesst evaar!
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.
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.
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.
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.
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.
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.




