Tech of the Turbo 1.2 – External Wastegate Sizing

Posted on 13 February 2013 by admin

Tial External WastegateExternal wastegate sizing is a critical decision and from what I have read on forums people seem to think bigger is better and the more power you plan on running the bigger wastegate you need, wrong.

You see the idea of an external wastegate is not only for better control of your boost levels or a really cool sounding screamer pipe you cousin Ahmed welded up in his garden shed that will get you defected faster than you can hit boost! No, a really import function is to bypass the excess exhaust gas before it enters the turbine housing, and in order for the wastegate to do this efficiently you need to choose the right size wastegate.

The more boost you are running then the smaller the wastegate, because you want to run more boost less needs to bypass the turbine, and if you plan on running low boost then a bigger wastegate is required, use this simple guide below:

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

Now that you know how to choose a wastegate you can understand that just buying any wastegate is not a very smart move, work out you engine specs, turbo and boost level and depending on you goals choose wisely.

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