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Old 05-07-2005, 11:13 PM   #1
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03 wrx
gt35r, 2.5L, meth

Default How much is an external wastegate going to help?

So right now a vf30 is already on a borderline of how much lag I feel comfortable with, but I've heard that going to an external wastegate can decrease the rpm to reach full boost? I'm wondering, for people that have run a turbo on both internal and external wastegate, how much improvement you got since I was thinking I could go to an external wastegate and 1818F and not have much more lag than I have now. (I'm running the stock boost control w/ no restrictor pill for the vf30 so it's a laggier than a vf30 should be)
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Old 05-07-2005, 11:41 PM   #2
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Never heard of decreased spool with an external wastegate.

However, they do help with boost creep.

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Old 05-08-2005, 12:15 AM   #3
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I too was wondering the benefits of an external wastegate on a smaller IHI turbo, like a VF-39 for instance.
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Old 05-08-2005, 01:51 AM   #4
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Like Mark said, if you have boost creep which the 39 is notorious for having, it will help because it no longer uses the 39's internal wastegate to control boost.
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Old 05-08-2005, 01:58 AM   #5
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Hey at least you get a cool sound from the turbo!
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Old 05-08-2005, 02:18 AM   #6
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On a smaller turbo probably not much. You really have to be pushing alot of air and the WRX heads are the big factor. The 2.0 just does not make power. Look at the reams of T67's and GT35's all suck below 320whp on pump gas. Those have external wastegates. Same stick point as with an Internal Green.

I'd skip it and put in brakes.
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Old 05-08-2005, 02:55 AM   #7
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ah, ok thanks. Guess I just misinterpreted some info.

well it would be really cheap to do since I would do my own fabbing, I don't think the actual wastegate is that much right?
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Old 05-08-2005, 05:17 AM   #8
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about 200 new for a tial 38mm
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Old 05-08-2005, 09:38 AM   #9
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It'll be even more helpful on a small turbo (hotside) like the VF you're running. Running a small hotside is good for quick spool BUT hinders it's power output as rpms build into the upper end. By throughing on an external gate you'll realize gains by uncorking the exhaust manifold, thus helping the VE of the engine. And yes, it will also allow better control of boost as a bonus. Does this mean that an external gate is ALWAYS better? Not neccessarily as there are high dollar race cars that use turbos with internal gates so it just depends what the design is intended for and how it's designed
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