To big of an external wastegate?

[BgBlDodge]

Is there such a thing as to big of an external wastegate? I'd imagine there is but I'm not sure. Reason I'm asking is cause I'm looking at gates in the 40-50mm range and wanted to make sure I only bought this once. I'm looking to spray a 100-150 shot of nitrous on my 62/71/13ss (I know its not built for it but its what I got so I'm using it) and want to make sure that I get something that will work now but not hinder me later on.

Ill have a hamilton 181/210 billet cam in by this time along with his 110lb valve springs and pushrods.

 

[98andahalf]

I dont think you can really go too big on a wastegate. You want to make sure you can reroute enough exhuast to keep your turbo at a certain psi....

 

[NickTF]

Too big may be hard to tune from what ED has indicated to me. makes sense considering if you open a 60mm gate 1/16" it's going to result in a much quicker pressure drop then opening a 40 or 50mm gate 1/16". Give the gate manufacturer a call and i'm sure they will get you right.

 

[XLR8R]

Shouldn't think you'd need a very big WG with that twin-gate HTT as a single... especially with the bypass flow mods you can do to it.

 

[mondtster]

Too big may be hard to tune from what ED has indicated to me.

x2.

The simple answer would be no, but if you go too big you may have serious issues trying to adjust it to get your boost pressure where you want it to be.

 

[carfichris]

There is less room for tuning error. Creating a 2-2 1/2" hole in your pressurized drive system at the incorrect time isnt going to help your cause. In regards to relying on the internal gate even if its modified. We havent seen them handle nitrous loads and keep drive pressure regulated.

 

[BgBlDodge]

Too big may be hard to tune from what ED has indicated to me. makes sense considering if you open a 60mm gate 1/16" it's going to result in a much quicker pressure drop then opening a 40 or 50mm gate 1/16". Give the gate manufacturer a call and i'm sure they will get you right.

That's exactly what I was thinking.

Shouldn't think you'd need a very big WG with that twin-gate HTT as a single... especially with the bypass flow mods you can do to it.

From what I've read and talked to people is that when you go to an external gate you shut the internal gate on the turbo completely and let the external handle the load.

There is less room for tuning error. Creating a 2-2 1/2" hole in your pressurized drive system at the incorrect time isnt going to help your cause. In regards to relying on the internal gate even if its modified. We havent seen them handle nitrous loads and keep drive pressure regulated.

I'd imagine that dropping drive pressure to quick could actually almost stall the turbo out? And with nitrous through a small turbo such as mine I want to make sure that I don't have any problems at all with drive pressure. I'm gonna start out with a very small jet and work my way up until I see something I don't like.