Jim Banville

First, the title of this thread is supposed to read "How many...", not Hoa many...". Can someone fix that?

Anyway, as I was accelerating quickly yesterday and I accidentally pegged the tach just for a second! I really wish this car had a 5 speed rather than 6. The gears all seem too short! Should I be worried that I damaged something? I only have 600 miles on it so far. I felt a loss of power just as the tach was maxed out, but once I saw what I had done, I released the throttle quickly and shifted up. Was that the rev limiter kicking in?

amdeutsch

Jim, you really need to learn to use the search function more often. Max RPM, tranny interaction and the rev limiter have been talked about numerous times. :p

Jim Banville

I did a search. After reading a few posts I didn't find exactly the info I have asked for here so I decided didn't wait to spend an hour reading ALL the threads to find it

Things I'd like to know that I didn't find in a search...
1- How many people here have pegged their tach?
2- When does the rev limiter kick in on a manual 1.8?
3- What does it feel like?
4- Did I damage anything by pegging the tach for 1 second w/ only having 600 miles on the car?

Narcissus

Don't worry about it, a MB tranny is a lot more forgiving than a Kia's

Jim Banville

I'm not speficially concerned about the tranny. I mainly concerned about damaging the engine. I imagine it's a lot more complex and expensive to repair
I'm HOPING that MB has been conservative w/ their tach readout and this engine can take revving to 7K or over for a moment occasionally w/o problems.

Outland

There is NO WAY you damaged he engine by hitting the rev limiter while accellerating.

1. THe ECU retards the ignition to prevent you going higher.
2. If you insist, it shuts off the fuel
3. If the fuel shutoff wasn't there, the valves float before you get to engine destroying RPM.
4. These limits are set very low by very conservative German engineers.
5. THere's always the warranty....

The only way to damage the motor by over revving is downshifting from a speed much higher than the gear would normally see.

tyro

Blown Flux Capacitor, I'm sure.
Very expensive to replace.

Buellwinkle

It's actually more safer for the motor if you redline it than if you lug the motor at too low an RPM. I run mine to redline many times. Considering that I've probably done about 50 dyno runs, each to redline with about 50% more than factory boost without any incidents. It's especially easy to redline my new 1.8L compared to the 2.3L as it was rough and noisy so you really notice it, the 1.8L I can drive for miles on the freeway in 4th gear and not notice. Also, you can't exceed redline, it's impossible unless you can get a chip to allow you to do so. The car starts bucking at redline, same when you exceed about 130MPH from the rev and speed limiters.

Jim Banville

Is that convered under the warranty?
Speaking of which, I was driving to a friends house near Loganville, Ga the other day and I saw a Delorean setting in a parking lot w/ a for sale sign on it. I'd love one of those!!!! I hated them when they first came out, but years of watching BttF have made it really grow on me

Capt Nemo o2

I cant imagine you would ever hit the point where you would blow the motor by over reving it when accelerating. This engine has a 6000 rpm redline which actually gets set by the dyno runs. Redline is determined by going about 200 or so rpms past max power. Reving the engine past max HP is pretty much useless and at that point you would accelerate faster in the next gear than in the current one. The reason why the redline is so low is because the compressor blades in the supercharger become inefficient and start to rob power. Im sure the M271 can rev well up to 9000 rpm no problems considering the 318 CID V8 in my Jeep redlined at 5200. Now thats a small block, and any gear head knows that OHV engines dont rev anywheres near what an OHC engine can. If that engine neared 6000rpm I would be scared ****less! Ive seen cars that sent pushrods through the block and out the fender, very dangerous, and not to mention your engine is now a giant paperweight!!!

Capt Nemo o2

They are OK, but on LI would be a pain in the ***! Anyone who owns a boat in saltwater knows what happens to the stainless in salty air! Imagine a whole car!!! Your arm would be dead, you would have to wash your car with Naval Jelly!!! But it sure would shine!

Oh yeah... Ive pegged the tach a few times! LOL! I even pegged it on a 5-3 downshift getting off the parkway! 6500 rpms...

Moxxon

Have no worries Jim. That 1.8 is pretty resilient and pegging the tach for one second will not damage the engine.

tyro

Have you gotten an estimate on the blown flux capacitor?
Does anyone know if AMG/Kleeman/Brabus et al. makes a high performance flux capacitor?
Inquiring minds want to know.

mctwin2kman

Jim,

I have hit the old rev limiter once in a while. You will have no issues hitting it, as it cuts fuel as soon as you get there to protect the engine. The redling on the M271 is 6200 RPM. Rev limiter kicks in somewhere around 6300-6400! Still well within the range the engine can actually handle. I hit it more than a couple of times when I first got the car and was not used to the short first gear! Now I don't do it too often. Once in a while I will due to my right foor being extra heavy at times....

Oil Change

My car used to go inside red area in the rpm. I'm not sure why. Its auto.

Deutscher_Wagen

my auto shifts at about 6200 (slightly in red) when I punch it in auto.

CynCarvin32

While it sounds like nothing happened to your car, #5 on this list is more than a little false. Warranties do not cover over-revs, missed-shifts, or a lack of familiarity with the gearbox. Those mistakes are paid for by the owner’s wallet. Warranty items are things that fail in the normal course of use but driver error is not the normal course of use.

Simply running into the rev limiter is not a terrible thing and should not cause an issue. If you miss shift you will have a more serious issue.

inFiniTE LooP

same thing happens to me with an auto, i found it very strange that it would exceed redline, but oh well, i guess that's cool, heh

mctwin2kman

Redline on the M271 is 6200. The gauge just starts red at 6000. Kinda hard to see that extra 200RPM!


CynCarvin32,

There is only one way to over rev these engines due to the rev limiter and that is a missed downshift that would force the revs over there physical limits. The Rev limiter is well within the specs of the engine, or MB would have made it lower! No need to worry when there is a computer driven fuel cut-off for a rev limiter. It is very effective at not letting you over rev the engine due to too much on the GO pedal!

CynCarvin32

Believe me I know this well. I wish my C32, E55 and SL55 all would hold gears at redline so I would not have a useless upshift right before entering a corner where the lower gear is needed.

My issue was with somone saying that a warranty is for people to get their cars fixed when they screw up and break it. Fuel shut off is never an issue. It is there for a reason.