Z4 E85 N52B25 performance upgrade

Scarp · Post by **Scarp** » Thu Oct 05, 2017 8:14 am

Hi ,

Some of you may know me from the Z4 forum on facebook.

I own a custom Z4 E85 facelift N52B25 I know the performance is already great from stock but are there any possibilities of a supercharger ?

I communicated with ESS and they have a kit but dont have a soft and after 2 years probably getting nowhere .

Stock power is 177 HP now I have 255 HP since the engine basis is exactly the same asN52B25 in E89. I think except shrink camshaft ( which I dont want to use ) there are no more possibilities to upgrade the engine

There are no injectors the engine is too "weak" for a turbo the intake is great exhaust is completely custom made and the dyno tuning is made for the max limit .

I looked at the 3liter biturbo engine and there is a good chance that it may fit but there are a million problems connected with it and I think that wont work or if it does it will cost a price of an M .

I dont want to sell it the money and time invested is far beyond the level where selling would be a good idea

Any suggestions ?

Here a photo a bit older but it looks close to where it is now

https://imgur.com/0YyYb7C

Smartbear · Post by **Smartbear** » Thu Oct 05, 2017 8:29 am

Hi, how did you get your 2.5 up to 255bhp? Have you got a Dyno print out you can post?
Rob

Ducklakeview · Post by **Ducklakeview** » Thu Oct 05, 2017 9:12 am

Smartbear wrote: ↑Thu Oct 05, 2017 8:29 am Hi, how did you get your 2.5 up to 255bhp? Have you got a Dyno print out you can post?
Rob

I too would be interested in this.

Mike

Steve84N · Post by **Steve84N** » Thu Oct 05, 2017 10:02 am

Pretty sure he doesn't have 255hp and something has got lost in translation...

Scarp · Post by **Scarp** » Thu Oct 05, 2017 11:13 am

Nothing got lost in translation

as I wrote the engine is the same as in E89 the only difference is intake soft and manifold if you channge the exhaust intake and let it get tunned on a dyno you have 160kw as the E89 . Heres the dyno run not everything is on video - max power measured on 4th gear 254,8 PS / 187,4 Kw 273,6 Nm . You have the diagram from the dyno on my facebook fan page

facebbok.com/bmWhiteZ4

jamie_z4 · Post by **jamie_z4** » Thu Oct 05, 2017 11:16 am

Scarp wrote: ↑Thu Oct 05, 2017 11:13 am Nothing got lost in translation as I wrote the engine is the same as in E89 the only difference is intake soft and manifold if you channge the exhaust intake and let it get tunned on a dyno you have 160kw as the E89 . Heres the dyno run not everything is on video - max power measured on 4th gear 254,8 PS / 187,4 Kw 273,6 Nm . You have the diagram from the dyno on my facebook fan page facebbok.com/bmWhiteZ4

255 ps isn't the same as BHP - 255 PS is about 250 BHP.

Scarp · Post by **Scarp** » Thu Oct 05, 2017 11:30 am

sure and WHP even less

Ducklakeview · Post by **Ducklakeview** » Thu Oct 05, 2017 11:38 am

Mike

Ducklakeview · Post by **Ducklakeview** » Thu Oct 05, 2017 11:44 am

With a 7k redline too..

251bhp from a NA 2.5ltr ain't half bad!

Mike

Scarp · Post by **Scarp** » Thu Oct 05, 2017 11:52 am

thanks for putting the videos here originally the limiter was about 6500 now 7010

LSD from quaife 365mm 8 piston front and 365mm 6 piston rear brakes . BC racing suspension etc a great car I must say

but with 100 HP more it would be perfect for me

Ducklakeview · Post by **Ducklakeview** » Thu Oct 05, 2017 11:56 am

Scarp wrote: ↑Thu Oct 05, 2017 11:52 am thanks for putting the videos here originally the limiter was about 6500 now 7010 LSD from quaife 365mm 8 piston front and 365mm 6 piston rear brakes . BC racing suspension etc a great car I must say but with 100 HP more it would be perfect for me

Quaife ATB? I have one on mine and LOVE it!!

Mike

Joycey · Post by **Joycey** » Thu Oct 05, 2017 12:01 pm

A guy I've been chatting with has charged his N52B25 and got great results. See his dyno.

: BPC%20Dyno_09132017.jpg (141.72 KiB) Viewed 1814 times

Scarp · Post by **Scarp** » Thu Oct 05, 2017 12:04 pm

maybe he changed the camshaft thats the additional 25-30 HP can you pleas ask him ?

Ducklakeview · Post by **Ducklakeview** » Thu Oct 05, 2017 12:13 pm

Scarp wrote: ↑Thu Oct 05, 2017 12:04 pm maybe he changed the camshaft thats the additional 25-30 HP can you pleas ask him ?

Looks like a supercharger to me! Next thing on the lst for mine too!

Mike

Smartbear · Post by **Smartbear** » Thu Oct 05, 2017 12:27 pm

So is yours the 3litre but just known in the states as the 2.5? That would explain a lot as your 3litre cars are restricted down to 170bhp whereas ours are 258/ 265 according to what model zed they’re fitted to

Rob

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