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      04-10-2018, 02:57 PM   #1
Phil@BPC
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Bimmer Performance Center revisits an old friend

This a teaser but we will be revisiting an old friend that everyone has been asking us about on our Youtube channel, Facebook, Instagram, Twitter and PM's. The E90 N52 Turbo will be receiving some updates.

I will be updating this thread with more photos as we continue revisiting project. For now here are some photos of some of the updates
























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      04-10-2018, 03:52 PM   #2
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      04-10-2018, 04:38 PM   #3
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      04-10-2018, 04:49 PM   #4
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Thank the Lord.
I inquired with Bob about this, long ago.
Stoked!!
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      04-10-2018, 05:57 PM   #5
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Sub'd. You had me at teaser
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      04-10-2018, 07:31 PM   #6
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Forged pistons and connecting rods?!?! Would this be an upgrade available to us non-turbo dudes to be able to run more compression on revised tunes?!?!
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      04-11-2018, 09:06 AM   #7
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Quote:
Originally Posted by Eagle1oh7 View Post
Forged pistons and connecting rods?!?! Would this be an upgrade available to us non-turbo dudes to be able to run more compression on revised tunes?!?!
High compression add about zero in power. The biggest upgrade will be going to manual from automatic - and looking into a dyno tune with something like E85.

This is awesome though.
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      04-11-2018, 09:14 AM   #8
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      04-11-2018, 09:36 AM   #9
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Quote:
Originally Posted by Taskmaster View Post
Quote:
Originally Posted by Eagle1oh7 View Post
Forged pistons and connecting rods?!?! Would this be an upgrade available to us non-turbo dudes to be able to run more compression on revised tunes?!?!
High compression add about zero in power. The biggest upgrade will be going to manual from automatic - and looking into a dyno tune with something like E85.

This is awesome though.
I guess your mindset is anything under 10hp is nothing, but typically raising the compression from say 10:1 to 11:1 would result in a ~10hp bump once the timing and fuel is optimized for it. Is it worth it on anything besides a race car? I would say no.
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      04-11-2018, 10:52 AM   #10
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Quote:
Originally Posted by Taskmaster View Post
Quote:
Originally Posted by Eagle1oh7 View Post
Forged pistons and connecting rods?!?! Would this be an upgrade available to us non-turbo dudes to be able to run more compression on revised tunes?!?!
High compression add about zero in power. The biggest upgrade will be going to manual from automatic - and looking into a dyno tune with something like E85.

This is awesome though.
cant wait to see bob's findings on the e85 topic
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      04-11-2018, 11:06 AM   #11
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i waited a very long time for this post
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      04-11-2018, 12:59 PM   #12
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Quote:
Originally Posted by Eagle1oh7 View Post
Forged pistons and connecting rods?!?! Would this be an upgrade available to us non-turbo dudes to be able to run more compression on revised tunes?!?!
I've often speculated about my N51's hardware and wondered if all it would take to "make it an N52" is N52 rods and pistons. That said, totally not worth the work anyway for under 10 whp lol.

I could easily be wrong, but I remember that people usually talked about going to a LOWER compression when building for turbo setups, but I honestly couldn't tell you why as I never cared to look into it. I'm guessing that's what BPC is doing with theirs. Hmm, maybe the N51 in stock form is actually a better platform to turbo than the N52?
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      04-11-2018, 01:08 PM   #13
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I guess your mindset is anything under 10hp is nothing, but typically raising the compression from say 10:1 to 11:1 would result in a ~10hp bump once the timing and fuel is optimized for it. Is it worth it on anything besides a race car? I would say no.
No, my mindset is opening up the engine to replace the pistons and gaining zero horsepower wouldn't be worth it.
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      04-11-2018, 01:09 PM   #14
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Good stuff! I'm more curious about that crazy 8000+ RPM N52 you guys had... no info at all on that setup though, not on the youtube video either.
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      04-11-2018, 01:09 PM   #15
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Quote:
Originally Posted by atmosphericM View Post
I've often speculated about my N51's hardware and wondered if all it would take to "make it an N52" is N52 rods and pistons. That said, totally not worth the work anyway for under 10 whp lol.

I could easily be wrong, but I remember that people usually talked about going to a LOWER compression when building for turbo setups, but I honestly couldn't tell you why as I never cared to look into it. I'm guessing that's what BPC is doing with theirs. Hmm, maybe the N51 in stock form is actually a better platform to turbo than the N52?
The N51 actually has a different head.
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      04-11-2018, 01:13 PM   #16
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Ah, so same bottom end / rods / pistons? Thanks for the info!
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      04-11-2018, 01:17 PM   #17
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Quote:
Originally Posted by Taskmaster View Post
Quote:
Originally Posted by AWSB328iM View Post
I guess your mindset is anything under 10hp is nothing, but typically raising the compression from say 10:1 to 11:1 would result in a ~10hp bump once the timing and fuel is optimized for it. Is it worth it on anything besides a race car? I would say no.
No, my mindset is opening up the engine to replace the pistons and gaining zero horsepower wouldn't be worth it.
Agreed, I'd rather go down the route of a S54 transplant then build a N52 long block.
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      04-11-2018, 01:18 PM   #18
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I'm kind of interested in the pistons - they look like they are probably a longer skirt that stock? And looks like thicker ring lands to deal with the boost. They are probably heavier than stock though (same with the rods). What are your thoughts on machined caps vs cracked caps? I guess you just deal with it with bigger bolts?

Can you post a comparison of weights, and maybe something about how you're honing (or machining) the bores of the N52 block?

Quote:
Originally Posted by Eagle1oh7 View Post
Forged pistons and connecting rods?!?! Would this be an upgrade available to us non-turbo dudes to be able to run more compression on revised tunes?!?!
We already have forged rods - they are just designed to be super light (cracked cap, tapered small end, etc). These are made to be strong to take boost pressure - but they will most likely be heavier than stock, and maybe not the best choice if you want N/A.

Quote:
Originally Posted by 6ixSpd View Post
Good stuff! I'm more curious about that crazy 8000+ RPM N52 you guys had... no info at all on that setup though, not on the youtube video either.
That was the same engine they boosted - it was all stock internally.
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      04-11-2018, 03:17 PM   #19
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On the 8000 rpm, I always thought it was the oil in the lifter foaming up, and the lifter collapsing that kept anything over 7400rpm a problem. Wonder what their solution was.
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      04-11-2018, 04:31 PM   #20
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fun fun, any plans for building the head?
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FYI - I don't drive hard at all. So I'm not interested in more clamping force when I won't use it. Even on my car, I take it easy. It's just too loud to be enjoyable.
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      04-11-2018, 05:44 PM   #21
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On the 8000 rpm, I always thought it was the oil in the lifter foaming up, and the lifter collapsing that kept anything over 7400rpm a problem. Wonder what their solution was.
Solid lifters fix that problem
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      04-11-2018, 06:44 PM   #22
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I thought the manual transmission was the limiting factor.
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