what's your rpm at 100kmh?

[Guest tomasulu]

i have an 05 w211 E240 and rpm is around 2.5k (half way btw 20 & 30 on the guage) at 100kmh cruising. is that normal? i thought it is high... my previous 520 was doing 1.8k prm.

[Guest angela]

the '05 e240 is not 7gtronic right? so only 5 gears? they tend to go higher at that speed.

if im lucky, on a relatively cool night on CTE i can get 100kmph at just a lil above 2,000rpm on my W203 C180...

my '07 E60 523... even though on 6 gears it needs ard 2.5k to get 100kmph.. with windows down (greatly increasing drag) i sometimes go near 3,000rpm in gear 6... terrible...

ur 520 1.8k rpm is a damn dream for me.

[Guest tomasulu]

ya it is the 5-speed gearbox. i wonder if there is a way to lower the rpm... will ask the folks at c&c during next servicing.

[Guest ehwwong]

dont think they can do anything about it, when it is related to gear ratio's..

[Guest icebox]

This has to do with the transmission gear ratio, as long as the same transmission i.e gear box is used, the rpm will always be the same no matter what outside temperature is or whether you drive at day or night. Don't think Cnc will do anything for you, it can only be done by changing the your fifth gear or the final gear ratio.

[Guest angela]

the rpm will always be the same no matter what outside temperature is or whether you drive at day or night.

really meh? i can confirm my C180 ~2,000rpm at 100kmph with windows up and a/c on. but the moment windows down the rpm has to increase to maintain 100kmph...

i drive alone mostly at night, so not much variables..

[Guest stealth123]

i drive a 280... just noticed also that my rpm when my car cruises at 100km/h - about 2000 rpm. (also with aircon and radio on)

interesting how the rpm stays constant regardless of model huh

[Guest paddy]

i drive a 280... just noticed also that my rpm when my car cruises at 100km/h - about 2000 rpm. (also with aircon and radio on)

interesting how the rpm stays constant regardless of model huh

not for w124 leh :banghead:

[Guest mr w124]

well, my 124 is abt 3.1k at hundred. old 124 was abt 2.9. they say after tuning the engine n advancing the timing, can hit abt 2.7k at 100kph. older merc i guess. plus 4 spd auto......damm...i badly wanted to get the 5spd manual from tagore..

[Guest alexng]

Hi Mr 124, mine 124 E220 is like 3k rpm at 110km/h. and search thru the forum mentioned that this is the standard speed to check on the gearbox condition. but not sure is other model having the same checking method...

[g8crasher]

the rpm will always be the same no matter what outside temperature is or whether you drive at day or night.

really meh? i can confirm my C180 ~2,000rpm at 100kmph with windows up and a/c on. but the moment windows down the rpm has to increase to maintain 100kmph...

i drive alone mostly at night, so not much variables..

Brudder, windows wound down at 100km/h creates drag = macam parachute effect hence your engine has to work slightly harder to increase rpm. :thumbsup: Moral of story, on aircon better haha

[Guest angela]

Brudder, windows wound down at 100km/h creates drag = macam parachute effect hence your engine has to work slightly harder to increase rpm. :thumbsup: Moral of story, on aircon better haha

ya lor.. but den ppl like me who got 4 door, want to sexperience the joy of having the wind thru my air like convertible... only way to do so... i feel like opening the front windows creates less drag compared to opening the rear windows...

[g8crasher]

Brudder, windows wound down at 100km/h creates drag = macam parachute effect hence your engine has to work slightly harder to increase rpm. :thumbsup: Moral of story, on aircon better haha

ya lor.. but den ppl like me who got 4 door, want to sexperience the joy of having the wind thru my air like convertible... only way to do so... i feel like opening the front windows creates less drag compared to opening the rear windows...

Borrow Mercy's SLK since nobody taking care of it for her.

This is an interesting read about how drag increases exponentially over 50mph http://auto.howstuffworks.com/fuel-efficiency/fuel-economy/how-to-get-better-fuel-economy1.htm

[Guest mr w124]

Hi Mr 124, mine 124 E220 is like 3k rpm at 110km/h. and search thru the forum mentioned that this is the standard speed to check on the gearbox condition. but not sure is other model having the same checking method...

Hi Alex. Well, mech said the gearbox is alright. got to advance the timing i guess. 3k at 110 sounds good man. but then again, yours is a 2.2 litre engine. guess your ratios would be different. nvm. i just got to do some trial and error.

[Guest angela]

Borrow Mercy's SLK since nobody taking care of it for her.

later i use liao, after driving the BEAST in melb, come back dun like her slk anymore, blame me for making it slow..

[Guest bossbthk]

1.8L w211 ... slightly above 2000rpm...

[Guest tomasulu]

hmm, 2k rpm is what i expected. so what's the conclusion here? why is it that folks experience such different rpms at 100kmh? can I get c&c to eh (noob term alert) tune it down a notch?