What size external wastegate?

[toms73novass]

I plan on using an external wg on my he351cw with a s475 on the bottom.
(do not plan on using the internal on the he351.)

What size waste gate should I be looking for? 38mm , 44mm ???

 

[SINNER]

A 50mm gate would handle a ton of fuel and a good shot of nitrous too. If no spray is planned I would go with a 38mm. It is possible to go too large with a gate as I am finding out now.

 

[toms73novass]

This is a DD, definately no nx.

thanks for the info.

 

[straight 6 roar]

A 50mm gate would handle a ton of fuel and a good shot of nitrous too. If no spray is planned I would go with a 38mm. It is possible to go too large with a gate as I am finding out now.

Care to explain? I've got a lead on a 60mm....

 

[Big Blue24]

My 26mm internal gate is bypassing plenty of exhaust to keep the He351's shaft speed reasonable on my Junker Drag Truck's twin setup with HT4B (83mm) atmosphere turbo.

I don't think I'd personally waste the money on an external gate, but if I did, I'd probably look at something around 30 mm in size.