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-   -   '94 C280 Speed vs. Rev's (http://www.peachparts.com/shopforum/tech-help/20409-94-c280-speed-vs-revs.html)

christianpaul 07-06-2001 04:22 PM

I have '94 C280 - just recently purchased. BMW's for years before. Here's the topic: What can I expect for rpm's at 70 mph? My tach shows just over 3100 rpm!? Maybe I'm used to having a 5-speed manual but this rpm seems excessive...

If this is the norm for a '94 C280, what can I expect for 100mph? 120 mph? I keep wanting to reach down and upshift at 70 mph!

Somebody tell me this is normal...Thanks.

chowpit 07-06-2001 04:29 PM

Ok, its normal. No, really it is normal. My 300E will tach around 3300 RPM @ 75 mph.
Oh, and there is plenty of ass left in the engine @ 120mph. :D

christianpaul 07-06-2001 04:36 PM

Quote:

Originally posted by chowpit
Ok, its normal. No, really it is normal. My 300E will tach around 3300 RPM @ 75 mph.
Oh, and there is plenty of ass left in the engine @ 120mph. :D

Great - I'll rest a little easier. Until I get new rubber and an open W. Texas road it won't see 120 mph...Not that I'd drive irresponsibly, ever, never.

Thanks again!

David C Klasse 07-07-2001 01:05 AM

Yup, your car is all good. You will hit about 4,000 @ 100. Then if you hit 5,000 you're pushing 120+, and it could run all day long at this speed!
It sometime annoys me too... but atleast you don't always have to downshift when passing on the hwy!

christianpaul 07-09-2001 08:58 AM

Quote:

Originally posted by blackmercedes
Mercedes have traditionally NOT been "low rpm" highway cruisers. Some of the big V-8 cars have quite tall gearing (400E for instance) but the four and six cylinder cars have always had quite short gearing.

The move to the five speed autobox in 1997 resulted in lower engine speeds, and the final drive ratios were also dropped.

Don't worry about revving the M104 inline six. That puppy will cruise all day and night at 100+mph.

Get some V-Rated tires, and find some deserted road prior to running her at top speed.

JS.

Thanks to all who have responded - Really appreciated.

bobbyv 07-09-2001 03:01 PM

lookup the rpm at which your M104 engine develops max power. My guess is that your 4th gear ratio is designed such that the car reaches max speed at that rpm.


David C Klasse 07-09-2001 03:50 PM

Max horsepower for the M104 2.8 liter is 195 @ 5500 RPM, though redline is 6400, I believe.

Arthur Dalton 07-09-2001 03:52 PM

Quote:

Originally posted by blackmercedes
Mercedes have traditionally NOT been "low rpm" highway cruisers. Some of the big V-8 cars have quite tall gearing (400E for instance) but the four and six cylinder cars have always had quite short gearing.

The move to the five speed autobox in 1997 resulted in lower engine speeds, and the final drive ratios were also dropped.

Don't worry about revving the M104 inline six. That puppy will cruise all day and night at 100+mph.

Get some V-Rated tires, and find some deserted road prior to running her at top speed.

JS.

They actually changed in the 94/95 E320 series.
The 104.992/217hp went to both 1st gear start and 2:65 rear gearing.


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