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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N20, N26, B46, B48 Turbo Engine / Drivetrain / Exhaust Modifications > Forged BMW N20 Engine - 2014 220i
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      11-21-2020, 04:21 PM   #133
Kel918
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Navardi I had an idea about what if I added an external wastegate to the turbine housing, that would be controlled to open at like 22 psi if I ony wanted to run 20 psi on the internally wastegated turbos ? or would 22 psi be ok without having to go to such lengths because a 0.41 A/R is ridiculously small. I thought it would have at least been .63
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      11-23-2020, 03:59 AM   #134
navardi
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Quote:
Originally Posted by Kel918 View Post
Navardi I had an idea about what if I added an external wastegate to the turbine housing, that would be controlled to open at like 22 psi if I only wanted to run 20 psi on the internally wastegated turbos ? or would 22 psi be ok without having to go to such lengths because a 0.41 A/R is ridiculously small. I thought it would have at least been .63
Doing so creates a very inefficient setup on an already internally WG turbo (Adding a External WG to the Internal WG housing). This doesn't actually solve the A/R issue of the small Housing.

Really you need a bigger turbo, Whether that's a big Internally WG turbo like the Borg Warner EFR series, or an Externally WG Turbo with Custom Manifold (A turbo Example would be the Garret GTX 3071R). At this stage BM3 Hasn't released their EWG Delete for External WG Setups and No one has tried the Turbo Smart Electronic External WG controller on DME's that come factory with OE EWG setups.

TLDR, everyone needs to move away from the stock Frame turbos, to make more reliable power on these motors.

SPA, at this stage seem to be interested in working on a Custom Manifold to support Larger Internally WG setups. Before looking into External WG setups.
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