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M2 Technical Topics > N55 Engine / Drivetrain / Exhaust / Bolt-ons / Tuning > Specs for bolts to install E-Wastegate onto N55 turbo?

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      03-23-2024, 02:27 PM   #1
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Specs for bolts to install E-Wastegate onto N55 turbo?

Anyone with an N55 EWG, do you have the specs for the four bolts that attach the electronic wastegate to the turbo? I was told that BMW only sells the bolts with the wastegate. I’m hoping that someone has the bolt specs, photos, part number? It’s probably an M4 or M6 with an integral washer. Someone told me that it’s an M4x12. I’m hoping to obtain a photo and BMW part number. BMW must use the same bolt somewhere else. Thanks!
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      03-24-2024, 12:57 PM   #2
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Originally Posted by johnung View Post
Anyone with an N55 EWG, do you have the specs for the four bolts that attach the electronic wastegate to the turbo? I was told that BMW only sells the bolts with the wastegate. I’m hoping that someone has the bolt specs, photos, part number? It’s probably an M4 or M6 with an integral washer. Someone told me that it’s an M4x12. I’m hoping to obtain a photo and BMW part number. BMW must use the same bolt somewhere else. Thanks!
I tried to help but it sucks that realoem shows the screw/bolt but no part number. :-(
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      03-24-2024, 02:55 PM   #3
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Originally Posted by M2guru View Post
I tried to help but it sucks that realoem shows the screw/bolt but no part number. :-(
Thanks! Yeah, it’s frustrating. Hoping to find someone who happens to have it in hand, either just bought an electronic wastegate kit or just took their N55 EWG turbo off.
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      03-24-2024, 04:48 PM   #4
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Quote:
Originally Posted by johnung View Post
Anyone with an N55 EWG, do you have the specs for the four bolts that attach the electronic wastegate to the turbo? I was told that BMW only sells the bolts with the wastegate. I’m hoping that someone has the bolt specs, photos, part number? It’s probably an M4 or M6 with an integral washer. Someone told me that it’s an M4x12. I’m hoping to obtain a photo and BMW part number. BMW must use the same bolt somewhere else. Thanks!
You'll likely need to call the dealer.
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      03-24-2024, 05:02 PM   #5
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You'll likely need to call the dealer.
Already did. Was told that BMW lists no information on the bolt other that it comes with wastegate
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      03-24-2024, 09:22 PM   #6
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It is indeed M4x12 and the official torque spec is 2nm +/- 0.3nm (source: ISTA). Not sure if they sell those bolts seperately but I'm sure they'd be easy to find. Hope this helps!
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      03-24-2024, 09:45 PM   #7
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Originally Posted by samsamdar View Post
It is indeed M4x12 and the official torque spec is 2nm +/- 0.3nm (source: ISTA). Not sure if they sell those bolts seperately but I'm sure they'd be easy to find. Hope this helps!
Thank you!
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