80mph @3000rpm?
Thread Starter
Super Member
Joined: Feb 2006
Posts: 674
Likes: 0
From: USA
1999 C43
80mph @3000rpm?
Hello guys, I took my C43 for a highway ride for the first time today. Making the story short; rpm was 3000 at 80 mph? Isn't it little high? Eventhough it is a very quiet engine, I could kinda hear it screaming. I wanted your input on this please. If you drive that speed would you please let me know? Mercedes Dealer ADVISER told me that it was kinda high, i shoud have stopped by to get it checked (typical).
But when I stop and drive I can see and feel that it shifts 5 gears. I will sleep better tonight if this 80mph at 3000rpm is normal. Cause when I hit the pedal little more, it still flies without downshifting.
Thank you
But when I stop and drive I can see and feel that it shifts 5 gears. I will sleep better tonight if this 80mph at 3000rpm is normal. Cause when I hit the pedal little more, it still flies without downshifting.
Thank you
MBWorld Fanatic!
Joined: Feb 2004
Posts: 1,559
Likes: 0
From: Portsmouth, NH
none
Yes, that is normal. Or at least my car spins the same at 80mph, seems to me that my car is smack dab on 3000rpm at 80mph.
So according to my car your fine, if not we have the same problem. LOL
However, not too long ago I had my car up to 140mph and it didn't seem to be screaming or maxxed out. It actually achieved the speed pretty easy. So maybe 5th is a big ol' gear as 140mph is almost twice that of 80mph and the rpms didn't climb to much to achieve that speed. I've heard they will hit 168 with the V max limiter shut off, ECU mods can do this.
I think your ok, on a side note, my 99' W202 kompressor was right at 3000rpm while cruising at 80mph.
So according to my car your fine, if not we have the same problem. LOL
However, not too long ago I had my car up to 140mph and it didn't seem to be screaming or maxxed out. It actually achieved the speed pretty easy. So maybe 5th is a big ol' gear as 140mph is almost twice that of 80mph and the rpms didn't climb to much to achieve that speed. I've heard they will hit 168 with the V max limiter shut off, ECU mods can do this.
I think your ok, on a side note, my 99' W202 kompressor was right at 3000rpm while cruising at 80mph.
Newbie
Joined: Feb 2006
Posts: 13
Likes: 0
From: Oklahoma City, OK
1999 C43
Originally Posted by NitrogenBalance
However, not too long ago I had my car up to 140mph and it didn't seem to be screaming or maxxed out.
MBWorld Fanatic!
Joined: Feb 2004
Posts: 1,559
Likes: 0
From: Portsmouth, NH
none
It's normal bro, don't worry at all. It's actually nice cause at that RPM your about half way through the power so you've got some decent excelleration from 80mph. 90% of the cars on the road you wouldn't notice if you floored them at 80mph. The C43 actually pulls away from 80 pretty well.
P.S.
I'm having the kleemann ECU done at some point before spring(been sayin this all winter) and that should put my limiter around 168mph. Plan on getting a video shot of a high speed run around 160 if I can get enough room.
P.S.
I'm having the kleemann ECU done at some point before spring(been sayin this all winter) and that should put my limiter around 168mph. Plan on getting a video shot of a high speed run around 160 if I can get enough room.
Trending Topics
Member
Joined: Sep 2005
Posts: 80
Likes: 0
From: SF Bay Area - South Bay
'01 C320; '06 GSX-R600
Originally Posted by Vardar
Hello guys, I took my C43 for a highway ride for the first time today. Making the story short; rpm was 3000 at 80 mph? Isn't it little high? Eventhough it is a very quiet engine, I could kinda hear it screaming. I wanted your input on this please. If you drive that speed would you please let me know? Mercedes Dealer ADVISER told me that it was kinda high, i shoud have stopped by to get it checked (typical).
But when I stop and drive I can see and feel that it shifts 5 gears. I will sleep better tonight if this 80mph at 3000rpm is normal. Cause when I hit the pedal little more, it still flies without downshifting.
Thank you
But when I stop and drive I can see and feel that it shifts 5 gears. I will sleep better tonight if this 80mph at 3000rpm is normal. Cause when I hit the pedal little more, it still flies without downshifting.
Thank you
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Member
Joined: Jun 2005
Posts: 86
Likes: 0
From: Miami, FL
2000 CLK 430 Coupe
Originally Posted by Vardar
come on guys! Excep nitro, no one is answering this serious. Is it the same with your vehicles (3000rpm at 80mph?) It has to be stock C43 though.
thank you
thank you
Short answer: yes.
Long answer:
Engine RPM at a given speed is a function of gearing, and other than slight changes in wheel diameter, I can't think of any popular modifications that affect this. Intake, exhaust, new plug wires, braking hardware, even forced induction or a limited slip differential--none of these would affect the RPM an engine turns at 80mph. Therefore, even if you hear from someone who has modified their car, there is a good chance the comparison is still valid, as long as it is in fact an identical model.
Aside from a false tachometer reading, here are two likely ways in which your car would be turning a higher than normal RPM at 80mph: the diameter of the tires is smaller than it should be, or the car's transmission is not successfully shifting into its highest gear. I'm assuming that you would be able to verify the correct rolling diameter based on tire specs, so here is an idea regarding the second scenario.
A simple experiment. (1) Drive 80 mph with the transmission in "D". Note engine rpm. (2) Drive 80 mph with the transmission in "4". Note engine rpm. (3) If engine RPM was lower in step 1 than in step 2, your car is probably succesfully shifting into 5th gear, and you are probably okay.
Enjoy the ride.
Regards,
e harmon
Thread Starter
Super Member
Joined: Feb 2006
Posts: 674
Likes: 0
From: USA
1999 C43
RPM goes to 3500 at 4th gear @80mph, and at overdrive it is at 3000rpm, So I guess with you guys' help, I will be sleeping better......
Thank you kindly!
Thank you kindly!
Originally Posted by e harmon
A simple experiment. (1) Drive 80 mph with the transmission in "D". Note engine rpm. (2) Drive 80 mph with the transmission in "4". Note engine rpm. (3) If engine RPM was lower in step 1 than in step 2, your car is probably succesfully shifting into 5th gear, and you are probably okay.
Enjoy the ride.
Regards,
e harmon
Enjoy the ride.
Regards,
e harmon
Thread Starter
Super Member
Joined: Feb 2006
Posts: 674
Likes: 0
From: USA
1999 C43
Wow thats a really wide gear!, I noted that when I hit the gas @ 80mph, C43 flies without downshifting. This is extraordinary to me....
[QUOTE=So maybe 5th is a big ol' gear as 140mph is almost twice that of 80mph and the rpms didn't climb to much to achieve that speed. [/QUOTE]
[QUOTE=So maybe 5th is a big ol' gear as 140mph is almost twice that of 80mph and the rpms didn't climb to much to achieve that speed. [/QUOTE]
