As some of you may be aware I've recently had my car mapped.
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Results were good but there's still room for improvement.
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Unfortunately, I now seem to be suffering quite a lot of boost creep.
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Most noticeably in 4th and 5th gear, I've seen the gauge hit 24-25psi, at which point, the ecu says no more and cuts ign to save the engine.
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So I've come to the conclusion that my internal wastegate just isn't efficient enough.
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The turbo is a Garrett GT2871R
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(unsure of turbine housing A/R).
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I want to convert to external wastegate in order to fix the creeping, so I've been doing a fair bit of searching, on here and google, etc.
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It seems there's a few options available;
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1.
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Custom manifold with built in ewg port.
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2.
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Drill a hole in my existing manifold and weld on a flange.
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Something like this
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![Image](http://i1311.photobucket.com/albums/s669/mr2gr/D58AD644-B146-4A06-9B5B-D142DC59F09C_zpstazldyfd.jpg)
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3.
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An adaptor that fits between the manifold and turbo with an ewg flange welded to it.
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Then just disconnect or weld up iwg
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(seems to be lots of debate around whether just disconnecting will keep the flapper shut).
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4.
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Swap my exhaust housing for the ATP special turbine housing.
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Seen here
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http://www.atpturbo.com/mm5/merchant.mv ... y_Code=HSG
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Now im not exactly a wealth of knowledge when it comes to turbos so i'm hoping somebody can step in and tell me that this will just be a simple swap of housings.
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Im unsure of the A/R of my current housing and this special housing is
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.72 A/R.
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Does that matter? I know it'll affect spool time, I just want to make sure I don't need to change anything else.
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Another issue I see with this is that it will bring the wastegate out, facing down and possibly hitting the block.
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I've found this 90 degree pipe that looks like it might work if that were an issue though.
http://www.himni-racing.com/wastegates/ ... -stainless
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Number 4 is probably my preferred choice, due to the cleanliness of it.
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Obviously a custom manifold would be nice but then we're talking major
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£££ and it's probably a bit overkill for my setup.
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Looking at using a Tial MVR wastegate like this
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http://www.tialsport.com/index.php/tial ... tes/39-mvr
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Any help appreciated,
Josh
![Very Happy :D](./images/smilies/icon_biggrin.gif)