HP Ratings
01-02-2007, 05:21 PM
#1
Super Member
Thread Starter
HP Ratings
A friend who owns a M5 says that BMW rates thier HP at the rear wheels whiles Mercedes rates thiers at the crank. Any truth to this?
01-02-2007, 05:23 PM
#2
I thought everyone rated theirs at the crank?
Isn't the M5 rated at 507hp, if that's rwhp, then that / .85 = crank right?
That's a 595hp car... vs the 493 -- lets say 510 because everyone knows Mercedes underrates -- so that means the M5, which is a much newer car than the E55, and has almost 100hp more, still can't whoop it's ***.
Ha, in your face BMW.
Isn't the M5 rated at 507hp, if that's rwhp, then that / .85 = crank right?
That's a 595hp car... vs the 493 -- lets say 510 because everyone knows Mercedes underrates -- so that means the M5, which is a much newer car than the E55, and has almost 100hp more, still can't whoop it's ***.
Ha, in your face BMW.
01-02-2007, 05:26 PM
#3
Super Member
Thread Starter
I thought everyone rated theirs at the crank?
Isn't the M5 rated at 507hp, if that's rwhp, then that / .85 = crank right?
That's a 595hp car... vs the 493 -- lets say 510 because everyone knows Mercedes underrates -- so that means the M5, which is a much newer car than the E55, and has almost 100hp more, still can't whoop it's ***.
Ha, in your face BMW.
Isn't the M5 rated at 507hp, if that's rwhp, then that / .85 = crank right?
That's a 595hp car... vs the 493 -- lets say 510 because everyone knows Mercedes underrates -- so that means the M5, which is a much newer car than the E55, and has almost 100hp more, still can't whoop it's ***.
Ha, in your face BMW.
01-02-2007, 05:30 PM
#4
MBWorld Fanatic!
Join Date: Sep 2004
Location: Ventura County USA
Posts: 1,958
Likes: 0
Received 0 Likes
on
0 Posts
'06 E55, '05 SLK55, a few others
No, he's wrong. Every single mfg. rates crank horsepower, never RWHP. This allows the overly optimistic mfg. to exaggerate their ratings with no consequences. You simply cannot afford to remove the motor, place it on an engine dyno, and refute the power claim. To do so would void the factory warranty and they still can claim variances in exhaust, intake, etc.
01-02-2007, 05:35 PM
#6
MBWorld Fanatic!
Join Date: Mar 2002
Location: South Florida
Posts: 1,662
Likes: 0
Received 1 Like
on
1 Post
STS,FGT,12C,P85D,M4
true, but with the new SAE standards, car makers can't "exaggerate" their claims anymore....
No, he's wrong. Every single mfg. rates crank horsepower, never RWHP. This allows the overly optimistic mfg. to exaggerate their ratings with no consequences. You simply cannot afford to remove the motor, place it on an engine dyno, and refute the power claim. To do so would void the factory warranty and they still can claim variances in exhaust, intake, etc.
01-02-2007, 05:43 PM
#7
MBWorld Fanatic!
Join Date: Sep 2004
Location: Ventura County USA
Posts: 1,958
Likes: 0
Received 0 Likes
on
0 Posts
'06 E55, '05 SLK55, a few others
They can and still do. The E63 DOES NOT make 507 HP. The SAE ratings are a help, but there still is no way to be sure how much power a motor is making without removing it from the car and placing it on an engine dyno. The SAE standard merely requires the mfgs. to use a standard way of measuring the power produced.
Trending Topics
01-02-2007, 07:05 PM
#9
Senior Member
Join Date: Sep 2006
Location: West Tennessee
Posts: 402
Likes: 0
Received 0 Likes
on
0 Posts
E63,,,not any more,,,BMW X5 50i
They can and still do. The E63 DOES NOT make 507 HP. The SAE ratings are a help, but there still is no way to be sure how much power a motor is making without removing it from the car and placing it on an engine dyno. The SAE standard merely requires the mfgs. to use a standard way of measuring the power produced.
01-02-2007, 07:23 PM
#10
Super Member
Thread Starter
I should state that this isn't a new M5. I believe it's a
'04-'05 that's been modded. He says it put out 500 rwhp. When I asked was that at the wheel or the crank, that's when he made that statement.
'04-'05 that's been modded. He says it put out 500 rwhp. When I asked was that at the wheel or the crank, that's when he made that statement.
01-02-2007, 07:39 PM
#13
I believe it was an E39, I'm sure you know the difference.
01-02-2007, 07:47 PM
#15
01-02-2007, 07:48 PM
#16
MBWorld Fanatic!
Join Date: Feb 2004
Location: Southern, CA.
Posts: 9,155
Likes: 0
Received 18 Likes
on
17 Posts
V12-Biturbo
How DO YOU KNOW it does not make 507HP????....maybe we should alert the enginers to that.........!!!!! I really don't know how much HP it makes, didn't take it to a dyno or anything like that, all I know that it feels fast ( butt dyno ) to me and I can still get a nice ticket for speeding. We all have cars that are not only fast, but good looking....I am thankful for what I have..!!
Last edited by Thericker; 01-02-2007 at 07:55 PM.
01-02-2007, 08:10 PM
#20
Member
Join Date: Nov 2006
Location: SoCal
Posts: 195
Likes: 0
Received 0 Likes
on
0 Posts
E63
If you have an 18% hp loss due to the drive train you would have a chassis dyno of 415 hp right? It seems as though the dyno run on the cls63 is right in-line with the hp claims if you assume an 18% loss. If I’m looking at the numbers wrong please tell me how it’s calculated.
01-02-2007, 08:16 PM
#22
Super Member
Thread Starter
01-02-2007, 08:22 PM
#25
MBWorld Fanatic!
Join Date: Mar 2002
Location: South Florida
Posts: 1,662
Likes: 0
Received 1 Like
on
1 Post
STS,FGT,12C,P85D,M4
They don't and won't.... the E63 does make the advertised power...
They can and still do. The E63 DOES NOT make 507 HP. The SAE ratings are a help, but there still is no way to be sure how much power a motor is making without removing it from the car and placing it on an engine dyno. The SAE standard merely requires the mfgs. to use a standard way of measuring the power produced.
