Curious; Real life HP for B58 Engine??

yanks1 · 11-08-2021, 01:58 PM

Featured on BIMMERPOST.com

I hear many folks rave about this fairly new BMW engine that is in the M240. In addition, also know BMW is famous for under-rating their engine output ratings. I had E46 330ci Coupe that felt a lot faster than its rated HP & Torque.

Anyone seen or read any real results of dyno testing for the B58 engine with no mods??

thanks...

kumizi206 · 11-08-2021, 03:34 PM

2021 Supra is also rated at 382hp. Here is one that made 388whp on the dyno. Obviously, the Supra is RWD so the 240i x-drive wont dyno the same.

That's around ~450hp

https://www.german**********/content...ed-at-388-rwhp

edit: dunno why this site wont let me link the url

Fentomized · 11-11-2021, 11:59 AM

Our X3 M40i 2019 (EU, 354 hp) feels a lot faster too.

There has been multiple dyno tests with the X3 M40i:

stock X3 M40i 2018 (UK, 360 hp), result: 394 hp
https://x3.xbimmers.com/forums/showthread.php?t=1558623

stock X3 M40i 2020 (US, 382 hp), result: 399 hp
https://x3.xbimmers.com/forums/showthread.php?t=1558623

I think the M340i will have been tested extensively at their forum.

MrFoxy · 11-15-2021, 12:09 PM

BMW and Porsche are notorious for this, your always gonna get extra power with them. Win win

Transfer · 11-15-2021, 07:05 PM

My M340i feels like 400 HP easy and the power band is just lovely. I expect no less from G42 M240i.

11-08-2021, 01:58 PM	#1
yanks1 Lieutenant 484 Rep 506 Posts Drives: '08 Mustang GT Vert 5-speed Join Date: Dec 2017 Location: SC iTrader: (0)	Curious; Real life HP for B58 Engine?? Featured on BIMMERPOST.com I hear many folks rave about this fairly new BMW engine that is in the M240. In addition, also know BMW is famous for under-rating their engine output ratings. I had E46 330ci Coupe that felt a lot faster than its rated HP & Torque. Anyone seen or read any real results of dyno testing for the B58 engine with no mods?? thanks... __________________ M240ix; Blue w/Black & Blue Stitching, M Illum. & Alum trim, Premium, M797 Bi-Color, Shadowline & HK Audio '08 Mustang GT Vert w/5 speed manual Past:325ci, 330ci (my favorite) & 2018 230i; '79 Vette (owned 13 yrs.)
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11-08-2021, 03:34 PM	#2
kumizi206 Private First Class 81 Rep 111 Posts Drives: 22 m240i Join Date: May 2015 Location: Dallas iTrader: (0)	2021 Supra is also rated at 382hp. Here is one that made 388whp on the dyno. Obviously, the Supra is RWD so the 240i x-drive wont dyno the same. That's around ~450hp https://www.german**********/content...ed-at-388-rwhp edit: dunno why this site wont let me link the url
	Appreciate 1 yanks1484.00 Quote

11-11-2021, 11:59 AM	#3
Fentomized New Member 7 Rep 13 Posts Drives: 2019 X3 M40i Carbonschwarz Join Date: Dec 2018 Location: Oost-Vlaanderen, Belgium iTrader: (0)	Our X3 M40i 2019 (EU, 354 hp) feels a lot faster too. There has been multiple dyno tests with the X3 M40i: stock X3 M40i 2018 (UK, 360 hp), result: 394 hp https://x3.xbimmers.com/forums/showthread.php?t=1558623 stock X3 M40i 2020 (US, 382 hp), result: 399 hp https://x3.xbimmers.com/forums/showthread.php?t=1558623 I think the M340i will have been tested extensively at their forum.
	Appreciate 1 yanks1484.00 Quote

11-15-2021, 12:09 PM	#4
MrFoxy Lieutenant 377 Rep 416 Posts Drives: F40 M135i. G42 M240i Join Date: Mar 2020 Location: Scotland iTrader: (0)	BMW and Porsche are notorious for this, your always gonna get extra power with them. Win win
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11-15-2021, 07:05 PM	#5
Transfer Major General 5254 Rep 5,874 Posts Drives: Bronco Wildtrak, Tesla MYP Join Date: Mar 2010 Location: Issaquah, WA iTrader: (1)	My M340i feels like 400 HP easy and the power band is just lovely. I expect no less from G42 M240i.
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