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Z4 E85 N52B25 performance upgrade

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Scarp

Member
Slovakia
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 :D

Any suggestions ?

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

https://imgur.com/0YyYb7C
 
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
 
Scarp said:
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
Click to expand...

255 ps isn't the same as BHP - 255 PS is about 250 BHP.
 
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
 
Scarp said:
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
Click to expand...

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

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

BPC%20Dyno_09132017.jpg
 
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 :thumbsup:
Rob
 
I'm confused, the 2.5l N52 in the e89 makes about 201bhp so I can understand getting to that from 177bhp but another 55bhp from a software tune seems incredible for an NA engine?
 
Steve84N said:
I'm confused, the 2.5l N52 in the e89 makes about 201bhp so I can understand getting to that from 177bhp but another 55bhp from a software tune seems incredible for an NA engine?
Click to expand...

I don’t think it’s 2.5litres, in the states they call the soft tuned 3litre a 2.5 (confusing eh?)
I think all that’s happened is the OP has had his restricted 3litre mapped to its natural output.
The version they get in the states has a single stage disa as opposed to our 3stage version. It’s hardware & software changes to get the missing mumbo back :thumbsup:
Rob
 
Steve84N said:
Surely that would still be the N52B30 though?
Click to expand...

I think my interpretation is right, the 2.5litre Car isn’t going to produce 255 ponies, it’s got to be a 3litre.
Rob
 
its a normal 2,5 liter :) but the N52 engine is the same as in E89 the M54 is different.

And there is no supercharger for the N52B25 only for the N52B30 :) I was thinking of swaping the 3,0 and making it custom aswell with a big supercharger :D


I never wrote it only soft there is a race exhaust custom made a race intake etc :) in europe the N52B25 in Z4E85 has 130kw (mine) and the N52B25 in E89 Z4 has I think 160 kw
 
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