Internal vs External- What Fits Me?

[Flash]

I plan on getting a PTE SCM5031 50 Trim, and I believe it comes with the option for an internal waste gate. I was wondering, if I really need a external wastegate or if the internal gate will fit my needs. I know I'd get boost creep with the internal gate, but look at my needs with the turbo...
I just like to drive my car enjoying getting on the gas every once in a while, I don't race, and I don't plan to max out the turbo any time soon, just run something like 20psi (I don't need anymore, I'm too scared )
So for my application, should I spend the money and get an external gate or stick with an internal waste gate?

 

[CanadianTSi]

Internal Gate will work fine for you.

I run an Internal gate on my 50 trim, never tried to run lower then 15psi but it holds that rock solid and when I want to run 24psi it holds that rock solid all the way to reline also.

 

[mitsuclipsegsx]

Stupid question but whats the difference if you go internal rather then external, i thought it was to help with boost creep but what if you dont have boost creep?

 

[joeracer321]

Stupid question but whats the difference if you go internal rather then external, i thought it was to help with boost creep but what if you dont have boost creep?

If you have a properly sized and functioning internal wastegate, then there is no difference. The bullseye power 38mm internal gate has proven itself by maintaining rock solid boost with no creep on 600+ HP vehicles.

 

[ISUJakey]

If you have a properly sized and functioning internal wastegate, then there is no difference. The bullseye power 38mm internal gate has proven itself by maintaining rock solid boost with no creep on 600+ HP vehicles.

Correct me if I'm wrong, but during Slowboy's testing of Bullseye turbos, did they not have multiple issues with the 38mm internal wastegate? Could you please provide a link to dyno charts showing these 600+ hp vehicles running the Bullseye 38mm internal gate?

 

[blcknspo0ln]

I'll try to quote Mike as best I can from memory " The problem with internally gated turbos is that if you try to tighten the WGA too much, you get a massive boost spike. On the other hand, loosening it too much leads to slower spool and not enough power".

On that note, I have a ported SCM PTE5031BB and I can hold 17 psi all day long. The problem with internally gated turbos is that the turbine housing is more often than not ported incorrectly. If you do not make the passage through the wastegate hole as accessible as possible, you will get boost creep. I have debated many times on whether or not to go internal or external, but as I arrived to my decision to get an internal gate, I could not be more satisfied with rock solid boost and more money in my pocket. However, if you'd like to spend the money to go external, you will never worry about the aforementioned problems again.

http://i16.photobucket.com/albums/b39/thelmasofast/DSCN0646.jpg

 

[DSM90AWD]

If you have a properly sized and functioning internal wastegate, then there is no difference

I disagree. I've recently swiched over to an O2 Mounted Tial44 and have found quicker spoolup due to the external's keeping the valve seated up until the preset boost level is achieved. My old internal (even properly set) would open progressively even before the boost threshold was reached.

I remember years back Jeff Elliot was making serious power (600+) on an internally gated "Mutt". Reason this was a sucessful combo was that he was running a ton of boost so very little exhaust was being bypassed via the wastegate.

Now if you were to run low boost on a big turbo, you're going to have a problem. Though porting, pre-tensioning the actuator..etc will help.

Also a 2.5" Downpipe (blcknspo0ln) creates enough backpressure to combat boost creep. I recently went full 3", hence my upgrade to an external (e.g. no more screwing around and it looks oh sooo sexy ).

You must be logged in to view this image or video.