[E91 M Sport]

Originally Posted by Bob@BPC

We are looking to do the same on our test mule but............ someone in the shop said lets put a turbo on it and so thats the path we are going down first

Possibly a system to sell in the future?

[Bob@BPC]

Originally Posted by hassmaschine

have you noticed the S55 uses the same parts? its redline is 7600rpm stock. Would BMW have such little margin leftover in the S motor?

in fact most of the valvetrain is the same except one of the rockers. I wanted to get one of them to see what the difference is.

We have taken it to the moon (8000+), but what happens is the lifters lose oil pressure and would collapse after 2-3 pulls on the dyno. Setting a limit, safe on the street or track, we found that 7700rpm, they would stay in working order.

Originally Posted by E91 M Sport

Possibly a system to sell in the future?

Starting work after we wrap up on a big project (F10 M5, custom billet BPC turbos) prototype turbo kit for the e90 n52 is next

[Taskmaster]

Originally Posted by Bob@BPC

We have taken it to the moon (8000+), but what happens is the lifters lose oil pressure and would collapse after 2-3 pulls on the dyno. Setting a limit, safe on the street or track, we found that 7700rpm, they would stay in working order.



Starting work after we wrap up on a big project (F10 M5, custom billet BPC turbos) prototype turbo kit for the e90 n52 is next

N/A FOR LIFE!

[justpete]

Originally Posted by Bob@BPC

We have taken it to the moon (8000+), but what happens is the lifters lose oil pressure and would collapse after 2-3 pulls on the dyno. Setting a limit, safe on the street or track, we found that 7700rpm, they would stay in working order.

7700 rpm redline it is, thanks for the information, very helpful.

[Taskmaster]

Originally Posted by justpete

7700 rpm redline it is, thanks for the information, very helpful.

That poor poor wallet

[E91 M Sport]

Originally Posted by Bob@BPC

Starting work after we wrap up on a big project (F10 M5, custom billet BPC turbos) prototype turbo kit for the e90 n52 is next

[justpete]

Originally Posted by TheAxiom

That poor poor wallet

Nah, it's seen way worse with other hobbies...

[E46driver]

Originally Posted by justpete

Nah, it's seen way worse with other hobbies...

Tell me about it. Bullets cost much more than gas.

[justpete]

Originally Posted by E46driver

Tell me about it. Bullets cost much more than gas.

Oh hellz yeah...:/

[Bob@BPC]

Originally Posted by E91 M Sport

M5 turbos BTW

bored all the way out with custom spec billet compressor wheels, upgraded wastegate springs and clipped the exhaust turbines. We are working on getting a oiless turbo for the n52 so no punching the oil pan for a drain

[CobraMarty]

Originally Posted by Bob@BPC

We are working on getting a oiless turbo for the n52 so no punching the oil pan for a drain

Comp Turbo?

[Bob@BPC]

Originally Posted by CobraMarty

Comp Turbo?

yeah, billet center housing. My buddy has one on his lightning making crazy power (76mm ball bearing oiless 4" out on the exhaust) 700hp on low boost (14lbs) and on 116 with 19-20lbs 900+ on a high stall built auto.

[Taskmaster]

Bob, any word on the N54/N55 manifold conversion?

[Bob@BPC]

Originally Posted by TheAxiom

Bob, any word on the N54/N55 manifold conversion?

I'll have an update on Monday or Wednesday

[E91 M Sport]

Originally Posted by Bob@BPC

yeah, billet center housing. My buddy has one on his lightning making crazy power (76mm ball bearing oiless 4" out on the exhaust) 700hp on low boost (14lbs) and on 116 with 19-20lbs 900+ on a high stall built auto.

I've read about those. 'Course there was the typical bench racer crowd talking crap but I think those could be a hot ticket. Can't wait to see the progress 👍🏼

[DigiDon]

Originally Posted by Bob@BPC

We can make it work, disable the MAF and use the factory MAP sensor and it will still use the air intake temp sensor. And as for the other items, I can do that as well. I think it would be cool to run the N54 short runner intake over the 3 stage on a boosted setup. We are thinking about doing this on our turbo setup as well. Im impressed with what you have done, im happy to see other people mod the forgotten bmw engine that got no aftermarket love like the n54 did.

Sounds like a plan.. I found multiple N54 intakes for cheap so gonna pick one up, I have N54 throttle body here somewhere, what other bits do I need to bolt this thing on?

If you have any questions about my setup let me know.
Thank you, I'm impressed with the work I see from your shop and your tuning knowledge with N52's.

Its been a long time since I started this project, but decided to stick with it. I just know these engines are capable of making stupid power. I've replaced multiple heads on these engines for the ticking noise and replaced multiple N54 heads (before they figured out how to clean them), and the superior design of the N52 head vs the N54 head is insane. The heads on these things are phenomenal! CNC ported, the direction and path of the runners, the flawless knife edge of the runners, its a pretty perfect head design. I just have to see what its capable of...

How does the remote tuning work, and what else would I need to get to make this happen?

Originally Posted by Bob@BPC

In order to hit 8k, you need to upgrade the lifters too, stock units can rev to 7700rpm with no issues

Is there an available upgrade for these lifters?

[Bob@BPC]

Originally Posted by DigiDon

Sounds like a plan.. I found multiple N54 intakes for cheap so gonna pick one up, I have N54 throttle body here somewhere, what other bits do I need to bolt this thing on?

We are working on a list now, From what I have been told by the techs, the n52 tb will work on the n54 intake

If you have any questions about my setup let me know.
Thank you, I'm impressed with the work I see from your shop and your tuning knowledge with N52's.

How does the remote tuning work, and what else would I need to get to make this happen?

I'll send you a PM later

Is there an available upgrade for these lifters?

I dont think there is an upgrade, but I have been looking into other valvetronic heads to see if the s55 has better stuff in it over the n52.

[hassmaschine]

S55 uses the same lifters, springs, secondary rockers, clips, retainers, etc. the only real difference is one set of rockers and the eccentric shaft which it shares with the N55 (the difference there primarily being the improved, smaller, more powerful & responsive valvetronic motor).

But the S55 stock redline is 7600, so I would tend to think BMW had left at least a little margin on the table. Maybe there will be some aftermarket support for the S55 and different lifters - they should drop right into the N52.

The one thing I want to look at is the rockers, they might be made for lower friction/better geometry or strength due to the higher stock rev limit but I don't know yet.

also, there are different cam profiles that could potentially work in the N52B30 - the N52B25, and the N55/S55. But you would have to buy them to find out if they are any "better" than the N52B30 cam..

[justpete]

Originally Posted by hassmaschine

S55 uses the same lifters, springs, secondary rockers, clips, retainers, etc. the only real difference is one set of rockers and the eccentric shaft which it shares with the N55 (the difference there primarily being the improved, smaller, more powerful & responsive valvetronic motor).

But the S55 stock redline is 7600, so I would tend to think BMW had left at least a little margin on the table. Maybe there will be some aftermarket support for the S55 and different lifters - they should drop right into the N52.

The one thing I want to look at is the rockers, they might be made for lower friction/better geometry or strength due to the higher stock rev limit but I don't know yet.

also, there are different cam profiles that could potentially work in the N52B30 - the N52B25, and the N55/S55. But you would have to buy them to find out if they are any "better" than the N52B30 cam..

Wait, an improved, smaller, more powerful, and more responsive valvetronic motor? Nice. Bet it won't retrofit though, with or without a different eccentric shaft....

[hassmaschine]

no, the head is a little different because it's placed in a new location and it's a brushless DC motor so MSV70/MSV80 doesn't have the right hardware for it either.

However all of the rest of the drivetrain bits, including the cams, should be compatible. But I would be surprised if the turbo profile was good for the N52.

the N52B25 profile could be interesting though. It might be more aggressive to make up for the smaller displacement. But I'm just speculating.

[justpete]

Originally Posted by hassmaschine

no, the head is a little different because it's placed in a new location and it's a brushless DC motor so MSV70/MSV80 doesn't have the right hardware for it either.

However all of the rest of the drivetrain bits, including the cams, should be compatible. But I would be surprised if the turbo profile was good for the N52.

No worries, figured as much but had to ask. Thanks.

[Bob@BPC]

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