I am looking into an aftermarket wastegate and have no idea what mm size and which one to get.

My setup:

Rebuilt Cosmo 13b-re engine
Stock porting
Stock injectors
Aeromotive Fuel regulator
Disabled twin sequential on stock turbos
Pinned stock internal wastegates
Greddy type rz blow off valve
Microtech lt10s w/ x4 box
FMIC
Innovate wideband
Running 14 psi on a solid 13 afr wideband reading
Not pro tuned

I would like to plumb an external wastegate in and set it at 14psi. What size mm is appropriate? And hopefully the price is around 200 to 300 bucks. Don't want to spend too much.

Thanks

 

If you don't wants to spend a whole lot of money you can always find them cheap on eBay. Sometimes you can get lucky.

 

Not really worthwhile or possible to plumb one in on stock turbos...

 

You're gonna blow the engine @ 13AFR. As mentioned waste of time to run external gates on stock twins. Just port the OEM units

 

Depends on what you're looking to do on the stock twins/BNR stage 3's. I'm actually in the process of modifying the twins to accept a 38mm external wastegate. It's a lot more work then you'd think and the manifold/rear turbine housing have to be heavily modified.

I plan to make a post detailing with what I've done when it's complete.