I need a favor

Jul 23, 2009 | 09:26 AM

hooleyboy

Thread Starter

Former Vendor of MBWorld

Joined: Jan 2007

Posts: 3,193

Likes: 3

From: Glendale Arizona

C55,SL55,C63

I need a favor

IF someone could get in their C55 and drive at 60mph and tell me what RPM they are at that would be great. Then do it at 70mph.

Jul 23, 2009 | 10:34 AM

Kompressor21

Senior Member

Joined: Apr 2008

Posts: 252

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From: Fort lauderdale, Florida

2005 Red C55 AMG and 2009 Harley davidson NIghtster SIlver and black

Ill do it for you right now.
I am going for lunch now I'll be back in an hour.

Jul 23, 2009 | 11:06 AM

SilverBulletAMG

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From: Keesler AFB, Gulfport, MS

C32 AMG

Quote:

Originally Posted by Kompressor21

Ill do it for you right now.
I am going for lunch now I'll be back in an hour.

A 9:30 lunch? That's brunch.lol

Jul 23, 2009 | 11:49 AM

rockjock

Super Member

Joined: Nov 2008

Posts: 844

Likes: 1

I DON'T COME HERE ANYMORE

I only got up to 34 in the parking lot before I had to left foot pretty hard....

Jul 23, 2009 | 12:25 PM

hooleyboy

Thread Starter

Former Vendor of MBWorld

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From: Glendale Arizona

C55,SL55,C63

Quote:

Originally Posted by rockjock

I only got up to 34 in the parking lot before I had to left foot pretty hard....

60mhp at cursing speed 5th gear

Jul 23, 2009 | 12:34 PM

SilverBulletAMG

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From: Keesler AFB, Gulfport, MS

C32 AMG

Quote:

Originally Posted by hooleyboy

60mhp at cursing speed 5th gear

Something tells me he was joking.

Jul 23, 2009 | 12:50 PM

alboogiee

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From: Tampa FL

heading out to lunch right now... will post back in an hour.

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Jul 23, 2009 | 02:02 PM

jturkel

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Joined: Oct 2006

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02 C32 AMG

Quote:

Originally Posted by alboogiee

@60 2125 RPM 5th gear
@70 2500 RPM 5th gear

wow.....pictures too?!? way to go

Jul 23, 2009 | 02:14 PM

#10

MBH motorsports

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From: Valley of the Sun, Arizona

C63, SL55, E55, CLS55, ML63, C55

Quote:

Originally Posted by alboogiee

@60 2125 RPM 5th gear
@70 2500 RPM 5th gear

you dont mess around. I thought my RPM's were messed up but all is fine now. I'm in the same area.

Jul 23, 2009 | 02:18 PM

#11

alboogiee

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From: Tampa FL

Quote:

Originally Posted by MBH motorsports

you dont mess around. I thought my RPM's were messed up but all is fine now. I'm in the same area.

Hoping that gets me a 95% discount on the long tubes!!!

Jul 23, 2009 | 02:32 PM

#12

Kompressor21

Senior Member

Joined: Apr 2008

Posts: 252

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From: Fort lauderdale, Florida

2005 Red C55 AMG and 2009 Harley davidson NIghtster SIlver and black

2300rpms @60 mph
2700rpms @70 mph.
Wasnt a brunch lol
I am in florida it was 11.. lol
why is it that my rpms are higher?

Jul 23, 2009 | 02:37 PM

#13

alboogiee

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From: Tampa FL

Quote:

Originally Posted by Kompressor21

why is it that my rpms are higher?

I was using cruise control in manual mode to show 5th gear and driving on flat land.

Jul 23, 2009 | 02:37 PM

#14

SoCalC55

Super Member

Joined: Apr 2007

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From: Orange County

2019 AMG C43

Likely you or alboogiee were on different slopes, that or there was a slight difference in the depression of the gas pedal.

Throw it in cruise in the flattest part of the highway

Jul 23, 2009 | 02:53 PM

#15

SilverBulletAMG

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From: Keesler AFB, Gulfport, MS

C32 AMG

Quote:

Originally Posted by Kompressor21

I am in florida it was 11.. lol

Doh!

Forgot about the different time zone. And here I thought you were from the future...

Jul 23, 2009 | 03:09 PM

#16

Kompressor21

Senior Member

Joined: Apr 2008

Posts: 252

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From: Fort lauderdale, Florida

2005 Red C55 AMG and 2009 Harley davidson NIghtster SIlver and black

yea damn time zones.

Jul 23, 2009 | 03:13 PM

#17

e1000

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From: OC

a quarter mile at a time

Quote:

Originally Posted by Mr. Special

Likely you or alboogiee were on different slopes, that or there was a slight difference in the depression of the gas pedal.

Throw it in cruise in the flattest part of the highway

slope wouldn't affect RPM for a given speed unless you drop down to 4th.

Most likely it's a slight difference in OD of the tires on the two cars.

Jul 23, 2009 | 03:29 PM

#18

SilverBulletAMG

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From: Keesler AFB, Gulfport, MS

C32 AMG

Quote:

Originally Posted by e1000

Most likely it's a slight difference in OD of the tires on the two cars.

That's what my money is on.

Jul 23, 2009 | 04:13 PM

#19

cannonball55

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From: San Diego, CA

'06 C55 AMG

Mine were the exact same as alboogiee

Jul 23, 2009 | 05:01 PM

#20

alboogiee

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From: Tampa FL

Quote:

Originally Posted by e1000

slope wouldn't affect RPM for a given speed unless you drop down to 4th.

Most likely it's a slight difference in OD of the tires on the two cars.

Bridgestone Potenza RE760 Sports 225/40/18 Front 90% tread, 245/35/18 Rear 50% tread...to get more technical.

Jul 23, 2009 | 05:19 PM

#21

mkonei

Super Member

Joined: Mar 2008

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From: Delran, NJ

05 C55

you can get your tires revolutions from the manufacturer. kompressor21 : the overall diameter on your tire appears to be smaller than the oem setup. you can most likely set tire revs with STAR somehow, so that your speedo and tach are correct

Jul 23, 2009 | 09:10 PM

#22

AMS Performance

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AMG

slope does affect rpm b/c of higher load necessary to get up a hill to maintain the same speed.

Jul 23, 2009 | 10:54 PM

#23

PC Valkyrie

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Joined: Apr 2004

Posts: 1,064

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From: Canada

C55 AMG, 135i, 911 GT3, GLE43 AMG

Here is something a little more official about the speed and rpm's in various gears. Taken from the Sport Auto Supertest of the C55.

Attached Thumbnails

I need a favor-engine-gear-speed-charts.jpg

Jul 24, 2009 | 12:14 AM

#24

e1000

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From: OC

a quarter mile at a time

Quote:

Originally Posted by AMS Performance

slope does affect rpm b/c of higher load necessary to get up a hill to maintain the same speed.

Unless your rear tires are slipping, since the C55 has a lockup torque converter, there is no slippage in the drivetrain. Whether going uphill or down, engine RPM will always be the same at a given speed at a specified gear.

Jul 24, 2009 | 08:03 AM

#25

c32AMG-DTM

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From: Philadelphia, PA

2008 A8L, 2002 996TT X50, 2009 X5

Quote:

Originally Posted by AMS Performance

slope does affect rpm b/c of higher load necessary to get up a hill to maintain the same speed.

Hmmm... you sure about that? Increased or decreased load requirements due to inclined or declined road angle variations would absolutely change the required throttle opening to maintain speed - but I can't see how it would change what engine RPM would be required to maintain X speed in Y gear. Care to elaborate?

Quote:

Originally Posted by e1000

This is my understanding as well. In kompressor21's case, his effective gearing has been changed by his aftermarket wheel/tire fitment. alboogiee appears to be using a stock C55 tire fitment, so his data is probably more useful to any C55 on 18's. hooley - what was going on with your ride to seem like the rpm's were off? Hopefully nothing too serious.