is a wastegate needed?

[s13rookie]

im just wondering if a wastegate is needed in a turbo system running little less than 10psi boost.  i know you need a BOV, but do they do the same thing? im just wondering cause the cheapest wastegate ive found was still over 600.  thanks,     matt

[whateverjames]

well, you're in luck because most turbo kits come with an internal waste gate for our 240sx's.

[9591]

Ahem, Fmax, XS Engineering, and Nsport kits *don't* use turbos with an internal wastegate. What other kits are there?
The cheapest GReddy wastegate is about $600, everybody else (HKS, Turbonetics, Tial) sells 'em for less. You can go with the Tial 35mm, which I've seen for as low as $200.
And yes, it is necessary. It's the thing that keeps your system at 10psi (or whatever). Without a wastegate, the turbo is free to boost as high as it can possibly go. A BOV, on the other hand, is not necessary, but a really good idea.

[wherezmytofu]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (9591 @ Mar. 31 2002,02:25)</td></tr><tr><td id="QUOTE">Ahem, Fmax, XS Engineering, and Nsport kits *don't* use turbos with an internal wastegate. What other kits are there?
The cheapest GReddy wastegate is about $600, everybody else (HKS, Turbonetics, Tial) sells 'em for less. You can go with the Tial 35mm, which I've seen for as low as $200.
And yes, it is necessary. It's the thing that keeps your system at 10psi (or whatever). Without a wastegate, the turbo is free to boost as high as it can possibly go. A BOV, on the other hand, is not necessary, but a really good idea.</td></tr></table><span id='postcolor'>
right ant wrong....the turbo itself doesnt have an internal wastegate...but the kit comes with a internal wastegate that goes on the turbo manifold....all kits must have a wastegate..internal or external...a BOV does not do the same thing as a wastegate...a bov releaser or redirects air that wasnt taking in and is coming back...this can really mess up shit...just think of it...ur turbin is spiining 100rmp one direction..then a stream of air hits it going a different direction.....thats the point of a BOV and thats what it does.....a wastegate release extra exhuast gases that are not needed to reach the psi level u have sett it to...so the exhaust fumes r ineought to make 9psi ...then all the extra exhuast fumes that ur engine makes is redirected either straight under ur hood (extrnal) or into the exhuast piping right after the turbo (internal) &nbsp;<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cool.gif" border="0" valign="absmiddle" alt=':cool:'>

[DrDubbleB]

It's exactly what wherezmytofu, said. &nbsp;A wastegate is needed in every turbo-application to prevent overboost.

A BOV is not needed, but they sound cool, and greatly increase the life of your turbo.

[9591]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (DrDubbleB @ April 01 2002,01:49)</td></tr><tr><td id="QUOTE">It's exactly what wherezmytofu, said. A wastegate is needed in every turbo-application to prevent overboost.

A BOV is not needed, but they sound cool, and greatly increase the life of your turbo.</td></tr></table><span id='postcolor'>
No, that's exactly what *I* said. <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[9591]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (wherezmytofu @ April 01 2002,01:33)</td></tr><tr><td id="QUOTE">right ant wrong....the turbo itself doesnt have an internal wastegate...but the kit comes with a internal wastegate that goes on the turbo manifold....all kits must have a wastegate..internal or external...a BOV does not do the same thing as a wastegate...a bov releaser or redirects air that wasnt taking in and is coming back...this can really mess up shit...just think of it...ur turbin is spiining 100rmp one direction..then a stream of air hits it going a different direction.....thats the point of a BOV and thats what it does.....a wastegate release extra exhuast gases that are not needed to reach the psi level u have sett it to...so the exhaust fumes r ineought to make 9psi ...then all the extra exhuast fumes that ur engine makes is redirected either straight under ur hood (extrnal) or into the exhuast piping right after the turbo (internal) <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cool.gif" border="0" valign="absmiddle" alt=':cool:'></td></tr></table><span id='postcolor'>
Sorry, but I was right and ... right. The kits I mentioned use external wastegates, that is, the wastegate is not integrated into the turbo housing, but is a separate item that mounts on the manifold. An internal WG, almost by definition, "vents" back into the exhaust system. An external WG may or may not. Fmax's kit does, XS's doesn't (dunno about Nsport).
(I didn't say anything about BOVs, other than that they're not necessary, but a good idea).
Other than that, what you said sounds right to me.

[wherezmytofu]

f-max uses an internal wastegate...in the us...external wastegates our 50 state ILlegal....f-max has been trying to get carb legal thats why they use an internal wastegate


ps....non emmission states dun giev a damn if u have a extrnal wastegate

[DSC]

I thought internal wastegates "vented" the exhaust back into the actual exhaust piping and external just let it out into the air(as tofu said). I didn't realize that any wastegates were actually built into the turbo housing, and I don't really see how thats possable. I've seen Fmax, and it was definately a separate peice.

[9591]

Here's a link to a picture of a turbo with an internal wastegate: http://www.turbocity.com/Turbos/turbo6.html
Note the round thing above the compressor; that's the "actuator" (I made up that name, probably not right). Notice the metal link running from the right of the actuator to the turbine. That link actuates the WG valve, *in the housing*. On second thought, "housing" probably isn't the right word, as the WG valve is incorporated into a piece that bolts onto the actual turbine housing's exhaust flange. I stand corrected.
Here's a link to F-max's site where it describes its turbo kits: http://www.f-max.com/NISSAN.htm Note that the description says it uses a Deltagate external WG.
An external WG, such as the Deltagate, can be either vented to the atmosphere (easy), or back into the exhaust (usually the downpipe; harder).

"Internal" or "external" has nothing to do with how the WG is vented (other than that internals are always vented back into the exhaust). Is the WG physically separate from the turbo? Can you just unbolt the WG from the manifold and replace it with another? These are the qualities that distinguish an external WG from an internal.

[wherezmytofu]

*slap head.....9591 is right...me wrong..internal = part of turbin housing, external = saperate component

...on a side note...f-max soon plans (beens aying it from 99) to change all their kits to internal wastegated turbos, so they can be a carb legal turbo kit...like greddy &nbsp;<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cool.gif" border="0" valign="absmiddle" alt=':cool:'>

[wherezmytofu]

to justify what i said......i was thinking of deltagate which alot of manufacterors called internal wastegates....rev-hard's and f-max(honda part) webpage use to call deltagate wastegates internal &nbsp;<img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cool.gif" border="0" valign="absmiddle" alt=':cool:'>