KILLER-LS1

iTrader: (18)

Back to the OP's question:

From Turbosmart:

Big Turbo/Low Boost = Bigger Wastegate
Big Turbo/High Boost = Smaller Wastegate
Small Turbo/High Boost = Smaller Wastegate
Small Turbo/Low Boost = Bigger Wastegate

Low boost requires venting more pre-turbo exhaust, so you need a bigger WG to do that. I think a Turbosmart 50mm pro gate would work well. Its still working for me in higher boost areas as well. Id imagine if i was 25+ psi i might want to downsize. At a certain point, the backpressure has more surface area to push open the valve on a big gate, which is why you want a smaller gate with high boost.

hope this helps!

JoshuaGrooms83

iTrader: (2)

define low boost?
like how low. obviously 4psi is low but what about 10psi? i have a 38mm with 7psi but if i uped it to 10lbs, should i look into a 44mm wastegate?

KILLER-LS1

iTrader: (18)

you'll be fine with the same gate.

Consider that imports can be 50+ psi and diesels can hit 100+ psi. so generally speaking the LS crowd would be lower boost. I would call high boost 20+ for us

JoshuaGrooms83

iTrader: (2)

ok sweet, wasnt looking forward to buying another gate lol
its gonna be setup rear mount style so was really wondering about this.

Jammer

iTrader: (1)

This thread shows a likely cause for my overboosting. Will update

pj5.0

anyone know how to get a hold of this guy.. i need some welding done.