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Old 04-04-2003, 03:23 AM   #1
Scooby Specialist
Member#: 18978
Join Date: May 2002
Chapter/Region: SCIC
Location: orange county, CA
96 brighton
05 AP2 ,09 GE8

Default advantages of external wastegate over internal wastegate?

what are the advantages of going with the external wastegate setup over the internal wastegate? will boost creep be eliminated completely? i'm wondering cause i am getting the aps d/r 500 front mount intercooler and was planning on going with the external wastegate setup, but will have to modify the the piping for the intercooler. seeing how the aps intercooler is, it'll be quote tough to reroute the piping to accomodate the external wastegated turbo. thanks in advance!

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Old 04-04-2003, 03:54 AM   #2
Scooby Newbie
Member#: 17457
Join Date: Apr 2002
Location: Orange County, CA
2002 Impreza WRX

Default External reacts quicker

The external wastegate bleeds off boost faster because it acts like a BOV for the exhaust gases. The internal pressure is bled off using a swing valve, which takes time to open. In order not to overboost, the swing valve will need to start opening earlier to slow the exhaust gases from spinning the exhaust turbine wheel. With the external wastegate, you can stay on boost a little longer since there isn't as much delay to bypass the exhaust turbine wheel. The same is true to close the bypass to get on boost.

In short, the external wastegate allows the turbo to stay on full boost longer and allows the turbo to get on boost sooner. In actuality, I personally don't think it is worth it to spend an extra $500 for the external wastegate and another $200 to get the piping done for a little better response. I think it is more cost effective to match port the bypass hole to the swing valve (sorry, but I don't know what it is called) and get a divorced wastegate downpipe which will save you about $500.

I don't have any comparisons, so I can be wrong.

Just my $0.02...
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