Would there be any benefactors of have an IWG turbo? Obviously there wont be another WG on the up-pipe, but just curious to any other info. I know some stock turbos are like for VWs/Audis....what about for the VQ?

 

I think they build boost faster, not really sure. Smart people chime in.

 

the only advantage would be a more simplyfied design and installation but they are typically much small than external units and therefore can cause boost spike and creap

i dont see how they would spool any faster both inter and external wastegates stay closed untill set boost is met and then open

 

Cheaper setup... that's about the only thing beneficial about them that I know of.

 

Only small turbos come with internal wastegate. And an external wastegate with low pressure spring is much more precise for low boost settings (i.e. 3.6-7psi). Cars that have stock turbos with IWG usually run higher boost than that.

 

[QUOTE=$tillenmax2k]Only small turbos come with internal wastegate. /QUOTE]

If you consider 450-630 hp turbos "small"

http://www.precisionturbo.net/turboc...tegory_id=3024

http://www.bullseye-power.com/produc...products_id=47

 

[QUOTE=burtreynolds]Those are rare exceptions, although they're still relatively small, and the quoted hp #'s are max values. Which means that's the turbo's limit, and has to produce high boost pressure with the reduced efficiency that generally occurs at that end of the spectrum.

That only happens if you have a boost controller of some sort, and it usually has to be digital. Wastegates open as soon as there's enough pressure to push the spring. Therefore, it gradually opens up until full boost is reached, and then it stays there, unless boost starts going up at which point the WG will open up more to bring the boost down. That's why a a good digital boost controller can significantly reduce lag, and increase power before the desired peak boost is reached. The WG will stay closed as the turbo's spooling, and open quickly right before the peak desired psi.

 

Nonsense. That Holset was originally designed for for Cummins, and the Precision Turbos are all T4 cold side (doesn't get much bigger). And almost all those turbos are far more efficient at "high boost pressure" of 25-30 lbs. than at say 5-10 lbs.

Also, I assume you are talking about an "Electronic Boost Controller" the only thing digital on some of them is the read out. And you can use and electronic boost controller on an internally gated turbo just as well as you can with an external wastegate, ask me how I know.

 

Internal W/G are easier installations. If you are serious about making hp, go external. You make more power using external w/g anyways.

Yes, EBCs can be used for either setups.

 

how do yo uknow, sorry guys im just trying to learn as much as i can

 

Do you mean how do you know if it's internal or external wastegate?

Internal means the wastegate is built into the turbo itself. External means one is not built in, and you must buy a separate one.

Internal wastegate turbo on left external wastegate turbo on right.





Here is a pic of a typical external wastegate in case you were wondering

 

Or were you asking me? I was being sarcastic because I use a Profec B w/ an internally gated turbo now.