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Thread: internal wastegate vs. external wastegate. Reply to Thread
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Topic Review (Newest First)
03-03-2009 05:08 PM
focusfreak03
Quote:
Originally Posted by streetracer View Post
that makes sense completely.. but the OP wants 230-250 whp.. which on a zetec can be achieved with 10-12psi.. not high by any means..

its all in what the end goal is..
yeah i know, but for reliability and for possible future upgrades, it just benefits to start out with the external.

BTW, i looked at your cardomain, nice car. have you painted the wing or are you going to? i couldn't tell from the pics.
03-03-2009 04:15 PM
streetracer that makes sense completely.. but the OP wants 230-250 whp.. which on a zetec can be achieved with 10-12psi.. not high by any means..

its all in what the end goal is..
03-03-2009 03:21 PM
focusfreak03
Quote:
Originally Posted by streetracer View Post
i konw i was just pointing out the fact that MANY people have high power setups with internal wastegates and it works great. and for 230-250whp internal would be perfect and less expensive.

its smarter to just buy high quality parts in the beginning and not expect them to break rather than to spend more on parts you think might break because its easier to fix..
i agree with you that you should buy high quality parts in the first place but have you seen the opening that an internal gate provides for exhaust flow compared to an external gate? the smaller the opening, internal gate in this instance, the more prone you are to get boost spikes, especially when you start turning up the boost, whereas with an external gate that is matched properly to the setup will geve you essentially no spike at all. not only that, but adjustable wga's further the spiking problem. even a 35mm external gate is bigger than most internal gates which will result in better boost stability and lessen the chance of having a spike that may be detrimental to your motor. my thinking is that you might as well do it right and safe the first time and if that means that you spend a little extra money on getting an external gate then do it and don't worry about whether a spike is going to be the end of your motor.
03-03-2009 02:14 PM
streetracer
Quote:
Originally Posted by focusfreak03 View Post
i never said that you couldn't have high pressure, high power setups with an internal, but the ability to hold boost better with an external setup, boost control, and reliability is a lot better compared to an internal. plus, if anything goes wrong with the external wastegate, it is tons easier to tinker with it than if you have an internal setup where you would have to take the turbo out which would require you to unhook all of the lines going to and from. plus if the internal wg somehow gets messed up, it could end up being a costly repair whereas the external gate you would just have to get a new one or call the company and get the specific part that you need.
i konw i was just pointing out the fact that MANY people have high power setups with internal wastegates and it works great. and for 230-250whp internal would be perfect and less expensive.

its smarter to just buy high quality parts in the beginning and not expect them to break rather than to spend more on parts you think might break because its easier to fix..
03-03-2009 11:26 AM
focusfreak03
Quote:
Originally Posted by streetracer View Post
for 230-250 whp an internal wastegate setup will probably be cheaper and work fine.. there are people pushing over 350whp with an internal wastegate setup.

Focussport made 396whp on a 2.0 duratec pushing 26psi with an internal wastegate
i never said that you couldn't have high pressure, high power setups with an internal, but the ability to hold boost better with an external setup, boost control, and reliability is a lot better compared to an internal. plus, if anything goes wrong with the external wastegate, it is tons easier to tinker with it than if you have an internal setup where you would have to take the turbo out which would require you to unhook all of the lines going to and from. plus if the internal wg somehow gets messed up, it could end up being a costly repair whereas the external gate you would just have to get a new one or call the company and get the specific part that you need.
03-03-2009 11:12 AM
waltscott You are now banned. Multiple Spamming. -CKA
03-03-2009 10:53 AM
streetracer for 230-250 whp an internal wastegate setup will probably be cheaper and work fine.. there are people pushing over 350whp with an internal wastegate setup.

Focussport made 396whp on a 2.0 duratec pushing 26psi with an internal wastegate
03-03-2009 10:19 AM
69fordfastback After doing a crap load of reading it deff makes since now. Ive had a turbo for quite some time now. A friend had given me an extra one that had accidently been shipped to him ( though its like a 200$ ebay one). I kinda wanted to go with a name brand one for reliability purposes and thats when i started getting a little stumped. Thnx much for your help though. after approval from the wife things should start getting interesting, and probably frustrating.
03-03-2009 08:49 AM
focusfreak03
Quote:
Originally Posted by 69fordfastback View Post
that was a really good explanation. thank you. i guess the only other question i have is to what psi is the internally regulated turbo good for. here's the thing. i have a zx3 with basic mods (cai, udp, bosal cat back exhaust, plugs, and wires) im wanting to get around 230- 250 hp
it just depends on the turbo. even some of the bigger turbos, not sure which ones off the top of my head, have internal wastegates, but most just weld them shut and put an external gate on their setup for reliability and control purposes. if you haven't gotten a turbo yet and are leaning more towards the external gate, make sure you either find one without internal or try and order it with an exhaust housing the doesn't have it. if you find one that you can't get without the internal, then just get it and have someone take the flapper off and weld a plate over the whole. also, if you get an external, make sure you get the right size, 35, 38, 42mm etc. like i said before, to big or too small is bad. on the focus, you will more than likely have a smaller one unless you are doing a major build with a big turbo. i think that the 35 or 38mm sizes should be good for most foci applications.

good luck with the build.
03-02-2009 09:16 PM
69fordfastback but it sounds like the external wastegate is really the way to go regardless...thnx again for the help.....now the hunt for a down pipe
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