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01-20-2009, 03:35 PM | #1 |
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Why are all M3s rated at 414 Bhp ,when they actually produce 320 Whp at the Dyno...?
After my last post...when i have discovered that my M3 is making 326 whp i started a little research and found out that the average car is actually producing...that much.I would expect a 414 bhp car to make around 350-370 at the wheel on order to justify BMWs claim.After that i had a talk with my service store wich happens to have a lot of Dyno knowhow in the country,and they told me that they have had the same thing with E46 M3...There was a huge gap between the Factory claims and the actuall power they have measured with different type of Dynos..That got me ending up with the following 2 scenarios..either..
1)BMW MCars cannot be measured correctly in Dynos(for a number of reason i am not awared of...) 2)The M3 actually is Underpowered and does not produce 414 bhp we all payed for...(Wich is something much more serious for me). I guess one way to find out is to have a Car of Similar Power-Torque-Weight on a Drag Race so we can come down to some kind of conclusion...It might be old-fashioned but it is the method to show the truth... I really wanted to share my thoughts with you guys...and since we can have a post for that matter now,i would really like to hear what you think of this...? |
01-20-2009, 03:49 PM | #2 |
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yea that is weird
i think the engine is most probrably underpowered imagine how sick it would be if it was rated at 414 horsies at the wheels Damn, but in any case, however disappointing and frusterated i am with this claim the m3 is still sick
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01-20-2009, 04:06 PM | #3 |
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Roughly a 27% loss, seems a bit excessive. What type of dyno was this?
Edit: So, on the ESS supercharger thread, their reported baseline on a dynojet was 353.52 whp (17%). Their results seem more on par. |
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01-20-2009, 04:11 PM | #4 |
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it's actually not. given the size of the engine this is very impressive. Remember Ferrari Modena? it was producing 420 hp and 275 lb/ft of torque out of 3.9 liter V8 too that revved to 8500! BMW is pretty fucking close for $200,000 less, and few years later
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01-20-2009, 04:52 PM | #5 | |
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Use a dyno as a relative measure - i.e. get a baseline of your car and then if you make modifications or want to compare performance at a later date, go back to the SAME dyno and have another go. The other thing to note is that some engines take a while to develop their full power - the B7 RS4 4.2L engine is a classic example - needs a good 10,000 miles or so... I'd recommend where possible using a chassis dyno - it will give you a higher reading but generally the results are more consistent as you are eliminating the highly variable losses that can be caused by tires and wheels...on a chassis dyno, you are pretty much only getting drivetrain losses... RRI has published two separate M3 dynos on their chassis dyno - both made just over 370HP at the hubs (only 10-11% loss), they also tested a C63 which made 401HP at the hubs (again, only a 11% loss)... M3 Coupe - http://www.rri.se/popup/performanceg...p?ChartsID=768 M3 Sedan - http://www.rri.se/popup/performanceg...p?ChartsID=793 C63 - http://www.rri.se/popup/performanceg...p?ChartsID=795 |
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01-20-2009, 06:57 PM | #6 | |
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01-20-2009, 07:02 PM | #7 | |
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01-20-2009, 07:26 PM | #8 | |
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01-20-2009, 07:43 PM | #9 | ||
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if you would know a little bit about race cars, you would be thinking how stupid that post is. He is not comparing Ferrari to M3 ... You are missing the point dude ... The philosophy of the way they are building their engines is the same ... not the cars |
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01-20-2009, 08:36 PM | #10 |
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If you owned or had ever driven the m3 you would shut your mouth man. the m3 makes this torque N/A...your 335 makes about the same torque with 2 turbo's?...thats pretty pathetic if you ask me
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01-20-2009, 09:36 PM | #11 |
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01-20-2009, 09:56 PM | #12 | |
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01-20-2009, 10:00 PM | #13 | |
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01-20-2009, 10:57 PM | #14 |
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Really, is that why it wins every comparo and revered by almost all car analysts as one the best all-around cars.
The E46 M3 didn't over power cars either. Last edited by M3WC; 01-20-2009 at 11:34 PM.. |
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01-20-2009, 10:58 PM | #15 | |
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01-20-2009, 11:01 PM | #16 | |
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01-20-2009, 11:49 PM | #18 | |
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01-21-2009, 01:24 AM | #20 | |
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Thank you for all your comments guys...it was really helpfull...
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PencilGeek i havent put in consideration that possibility....and i really hope that this is true...So based to your experiance,what did Dynapack showed for your Stock M3??? I also think that we should use the same Dyno as a tool to measure upgrades as Mixja recomended...Due to the relative measurment they can provide.... |
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01-21-2009, 04:37 AM | #21 |
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I dyno'd at 333whp stock on a dyno dynamics. I heard they read a bit low but are the most accurate. I wonder what 335's and tuned 335's get on a dyno dynamics?
Also I remember browsing some MB forum and saw a stock C63 dyno on a dyno dynamics and it was at 335whp and 335wtq.
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01-21-2009, 10:10 AM | #22 | |
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