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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 04-23-2013, 04:45 PM   #1
e46ornothing
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What rpm u show at 80?

Hey guys I'm pretty sure this is where this thread go but if not sorry.

I'm trying to see if my car is running ok.. I have a feeling that my rpms are running high.

Mainly at 80 mph, I'm showing about 3500-4000 rpms, is that right? It seems to high for me but I'm not sure, which is why im asking.

Any help would be appreciated!

Thanks
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Old 04-23-2013, 05:06 PM   #2
bmwTuner1
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Those are really high rpm's. I'm assuming you haven't changed your diff. When I changed the diff on my 330ci (manual) from a 2.93 to a 3.07 the rpm's at 80mph changed from appx 2600 to 2900.

Is your car auto? Do you know if its changing from 4th gear into 5th?
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Old 04-23-2013, 05:10 PM   #3
e46ornothing
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Originally Posted by bmwTuner1 View Post


Those are really high rpm's. I'm assuming you haven't changed your diff. When I changed the diff on my 330ci (manual) from a 2.93 to a 3.07 the rpm's at 80mph changed from appx 2600 to 2900.

Is your car auto? Do you know if its changing from 4th gear into 5th?
Yea I thought they were high. My car is a 05 325i 5 speed Manual. And it shows this in 5 gear while cruisin at 80 on the fwy hahah :/
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Old 04-23-2013, 05:10 PM   #4
2000beamer
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Approximately 2,700
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Old 04-23-2013, 05:20 PM   #5
e46ornothing
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So for sure I see my rpms are higher than there supposed to be at.

Anyone know how to figure out why they are? Or how to fix the problem?

Thanks
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Old 04-23-2013, 06:14 PM   #6
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Quote:
Originally Posted by bmwTuner1 View Post

When I changed the diff on my 330ci (manual) from a 2.93 to a 3.07 the rpm's at 80mph changed from appx 2600 to 2900.
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Originally Posted by 2000beamer View Post
Approximately 2,700
Is this for 5, or 6 speed?
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Old 04-23-2013, 06:16 PM   #7
2000beamer
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Is this for 5, or 6 speed?
5 speed auto. I really never put it in shifting mode, the car knows when to shift better than I do.
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Old 04-23-2013, 06:28 PM   #8
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OK, that makes sense, because sticks are supposed to have shorter gearing, like 2800 rpm @ 70 mph. Mine is auto also 2500 rpm @ 70 mph.
I love the ratios on the automatic.
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Old 04-23-2013, 06:31 PM   #9
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So for sure I see my rpms are higher than there supposed to be at.
Anyone know how to figure out why they are? Or how to fix the problem?
Thanks
Well, I see 3 possibilities:
1. the clutch is slipping
2. your tachometer is inaccurate
3. you're not driving in 5th gear
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Old 04-23-2013, 10:01 PM   #10
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Well, I see 3 possibilities:
1. the clutch is slipping
2. your tachometer is inaccurate
3. you're not driving in 5th gear
1. What is a symptom of my clutch slipping?
2. Could be a possibility since I installed m3 gauges from bimmian lol
3. Ur saying I'm driving in 4th? Lol trust me I'm in 5 haha
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Old 04-23-2013, 11:41 PM   #11
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When the clutch slips engine revs will be higher than should be at a given speed, but if it slipped that much, you would smell it. It must be the cluster that you swapped in, did you follow a DIY?
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Old 04-23-2013, 11:42 PM   #12
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That is normal for a 5 speed 325i. Sucks, but it is what it is.
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Old 04-23-2013, 11:54 PM   #13
e46ornothing
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When the clutch slips engine revs will be higher than should be at a given speed, but if it slipped that much, you would smell it. It must be the cluster that you swapped in, did you follow a DIY?
Yea I don't smell anything. I'm starting to think its the cluster swap, and yea even followed what bimmian said to do lol.
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Old 04-23-2013, 11:55 PM   #14
e46ornothing
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That is normal for a 5 speed 325i. Sucks, but it is what it is.
Why do u say that? Are ur rpms this high as well?
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Old 04-24-2013, 12:59 AM   #15
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Wait, you did a cluster swap? We're your rpm's lower before you did that?
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Old 04-24-2013, 01:22 AM   #16
e46ornothing
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Wait, you did a cluster swap? We're your rpm's lower before you did that?
No not an actual cluster swap lol. I bought the gauges that bimmian sells.. There the m3 style ones.. That's wat I meant
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Old 04-24-2013, 01:38 AM   #17
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Around 3500 is definitely normal for 80 mph on a 5 speed e46 325i
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Old 04-24-2013, 03:41 PM   #18
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Why do u say that? Are ur rpms this high as well?
Because 325s come with pretty short ratio diffs.
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Old 04-26-2013, 01:34 PM   #19
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Re: What rpm u show at 80?

I think I'm around 3700-3800rpm at 80mph in my 325 5 speed. But I also have 3.46 gears

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Old 04-27-2013, 03:26 PM   #20
NyC35AV
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I'm showing 3300 on my 5 speed 323i. I did a diff flush last week and for the life of me couldn't find a tag with the ratio! I do find myself trying to shift into another gear that's not there (6th gear) : (
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