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View Full Version : Newbie question about my RPM, clarify


dmytro
01-11-2010, 04:10 PM
I am bit confused about RPMs thing

I read around that people spin their engines pass 4000 RPM and 7000 RPM.....but I always switch gears just at around 2000 RPMs and never really go above 3000 as its just sounds like a tractor and waists tons of fuel.

So whats the difference between my car and others? *sad*

Thanks in advance.

e30_kid89
01-11-2010, 04:55 PM
Um, The person in the driver's seat?

T.Dot_E30
01-11-2010, 05:07 PM
You should always shift at 6500 rpm, didn't anyone teach you how to drive a bmw?

:D

everlast
01-11-2010, 06:28 PM
Not too many of us would go to 7K.. Nothing's wrong with you or your car. There is little reason to go above 2500K unless you're looking for more power to overtake or get away from a swarm of killer bees, etc.

Edit: Or to keep up with traffic in TO. ;)

davericher20
01-11-2010, 06:45 PM
:huh?:

If that's your thing, do it up man.

But your car can do 6500 rpm. Personally I think it sounds amazing when the engine is doing what it was made for.

E30M42cab
01-11-2010, 07:55 PM
If it sounds like a tractor (diesel), you probably need a valve adjustment.

craz azn
01-11-2010, 09:02 PM
There is no difference in car, just driver preference really. Sounds like you drive just like any normal person does, nothing wrong with that.

However, if you want to drive like a meathead and cause some ruckus (not that I ever do or condone such acts :D) then you probably need to change gear at higher rpms as an an E30 doesn't do anything exciting under 2k.

Ceeker
01-11-2010, 09:10 PM
From my bmw tech friend who is/was around when e30 were abundant told me depends on whether it was a stick or auto. He used see many auto's come in with chewed cams. Apparently people with autos would drive them in the low rpm range and wouldn't get enough oil to the top end of the motor. He suggests if you have auto to drive in 3rd rather then "D" unless you pass 80k when the rpm's start moving about 3000. If you have a stick and you're driving it 2000 revs? Sell it..no point owning it. lol. goes for the M42 as well. Especially the m42. :-)
bottom line. Keep the revs up. it's a bmw...

E30M42cab
01-11-2010, 09:29 PM
M42's only run around 4000RPM's and up:)

Nick_V
01-11-2010, 09:30 PM
an E30 doesn't do anything exciting under 2k.

Pretty much goes for any 4 or 6 cylinder (NA) BMW, IMO. Even my 540i needs a little more than that before it gets really fun. I get depressed when I do a lot of city driving in my car because it really feels like I'm doing it a disservice. Anyone else notice how sluggish*sleep* your car starts to feel when you do that? It never ceases to amaze me how they wake up after going through the gears a couple times though - everything seems to tighten back up!

BimmerDriver
01-11-2010, 09:39 PM
Nothing wrong in keeping the RPMs low for fuel economy and confort (quietness) but if I am not wrong somewhere in the owner's manual BMW actually recommends you to every time you get the chance to do some highway driving you try to run the engine above 3000 rpm for some time to clean the cylinders from carbon build up that happens during stop-and-go city driving when you idle a lot and drive at low rpms therefore causing imcomplete combustion.

SamE30e
01-11-2010, 09:40 PM
Unless you have an eta..

hockeyfan27
01-12-2010, 11:49 AM
You should always shift at 6500 rpm, didn't anyone teach you how to drive a bmw?

:D

When I was test driving my car, the sales guy straightened me out!

I forget exactly where, but when you pass a certain RPM there is a valve in the exhaust that opens the second tail pipe. I believe it is simply for noise reduction when at lower RPM, but I'd imagine it would also reduce back pressure and lets your car breathe a bit easier.

dmytro
01-12-2010, 11:52 AM
You should always shift at 6500 rpm

Still there is something missing in the puzzle. I heard there are "economy" e30 that save fuel. Maybe mine is one of those ...no idea mine is 325i

But there is no way I can switch at 4000rpms that will blow my tank of gas in an instant. (EDIT: if I switch at 2000-2500RPM I get very good gas mileage)

Anyways weird. :rolleyes:

everlast
01-12-2010, 12:18 PM
When I was test driving my car, the sales guy straightened me out!

I forget exactly where, but when you pass a certain RPM there is a valve in the exhaust that opens the second tail pipe. I believe it is simply for noise reduction when at lower RPM, but I'd imagine it would also reduce back pressure and lets your car breathe a bit easier.

E36s.. not E30s.

everlast
01-12-2010, 12:23 PM
LOL @ some of the peeps in here. Their internet humor / sarcasm detectors must be broken.

Shift where ever you want - higher = more power, lower = better fuel economy. You will cause slightly more wear shifting higher than lower, and ceeker, I think that tech was pulling your leg.. Open up your oil cap at idle and watch the oil float around. Better yet, watch this vid I took in slow mo:

http://www.youtube.com/watch?v=Y8H8rZ1LDL8

I've seen gently driven e30s with 400,000 kms and no cam wear.

dmytro
01-12-2010, 01:17 PM
Alright it helps, thanks all for input. *th-up*

voluted
01-27-2010, 04:23 PM
My car turns over @ 2000, idles at 4000 :(. I think something is wrong with me.