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General E46 Forum
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Old 12-12-2012, 10:18 AM   #1
Ruthlessone3k
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Join Date: Dec 2012
Location: Germany
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My Ride: 323i
Need some simple answers from 323I automatic owners

What RPM are you turning at 60mph, 70mph, and 80mph? And what trans do you have.

Mine is a GM 5spd steptronic in a 2000 323i
60mph=~2300-2400rpm (had trouble getting level road)
70mph=~2900rpm
80mph=~3300rpm

I think my T/C is slipping, your input could help confirm this.
Thanks,
-Tyler

Last edited by Ruthlessone3k; 12-12-2012 at 10:21 AM.
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Old 12-12-2012, 10:44 AM   #2
jfoj
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TCC slippage should light the orange cog on the dashboard??
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Old 12-12-2012, 10:56 AM   #3
rbalazsi
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This may be helpful to you: bokchoys e46 gear ratio calculator

For my 323iT, it shows 2757 as the rpm when at 80. From the looks of my tach, I'd have said 2800, so it appears pretty spot on.

I'd say 3300 that you're showing is a bit higher as my 330Cic which is a manual with a 3.07 diff shows as 3307 in 5th at 80 and that's about what I've seen IRL.

It almost sounds like you're in 4th gear rather than 5th. Can you manually set it to 5th and see if that makes a difference?

I can't imagine that you have something other than a 3.46 differential, has this been changed on your car?

Have you ever changed the transmission fluid?
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Old 12-12-2012, 10:59 AM   #4
Ruthlessone3k
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It might but my dash cluster is out of a manual and does not have the display for the cog. I have the other cluster but the speedo does not work in it. Although I tried it for a short drive and the cog did not light up except for the one time I tried to start it and forgot that 2 of the coils and the MAF sensor were still on the work bench. All the lights lit up that time. including the cog.

I have had a couple codes come up relating to the torque converter and I smell a little bit of hot ATF from time to time at stop lights. I was planning on replacing the T/C, Related seals, Fluid, filter, and TCC selonoid. I am also planning on taking it to the dealer to get the codes read Since I have a SES light even when I clear all the OBD2 codes. (can't run the v1.4 scanner since I am running ubuntu instead of windows on my computers and they don't have software to support it.) I just havent had time to get to the dealership yet.
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Old 12-12-2012, 11:00 AM   #5
Ruthlessone3k
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Quote:
Originally Posted by rbalazsi View Post
This may be helpful to you: bokchoys e46 gear ratio calculator

For my 323iT, it shows 2757 as the rpm when at 80. From the looks of my tach, I'd have said 2800, so it appears pretty spot on.

I'd say 3300 that you're showing is a bit higher as my 330Cic which is a manual with a 3.07 diff shows as 3307 in 5th at 80 and that's about what I've seen IRL.

It almost sounds like you're in 4th gear rather than 5th. Can you manually set it to 5th and see if that makes a difference?

I can't imagine that you have something other than a 3.46 differential, has this been changed on your car?

Have you ever changed the transmission fluid?
i just got the car last week so I don't know what diff is in it, the tranny fluid has been changed though.

Last edited by Ruthlessone3k; 12-12-2012 at 11:01 AM.
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Old 12-12-2012, 11:55 AM   #6
jfoj
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GPS works as a good speedometer!

$32 www.xcar360.com for BMW Scanner 1.4.0
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Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 12-12-2012, 02:06 PM   #7
Ruthlessone3k
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Quote:
Originally Posted by jfoj View Post
GPS works as a good speedometer!

$32 www.xcar360.com for BMW Scanner 1.4.0
like I said, I would love to use th 1.4.0 scanner, but they dont have any software support for linux systems, and all my computers are running a linux based OS. Also, the speed is not what I am questioning, rather the rpm at a given speed. The speeds given above are all taken with the speed and the RPM read directly from the ECU and compared in Track recorder in torque pro. also my ECU speed and GPS speed are monitered in this system with a variation of less than 1mph in this range. But this should not make a difference to the T/C anyway, as the computer and T/C only know the speed that the sensors are reading, not the GPS aquired speed.
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Old 12-12-2012, 02:22 PM   #8
ryannel2003
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That seems high. When I'm driving at 60MPH my car does about ~2200RPM's or so. I don't travel at those other speeds frequently so I don't know what they would be.
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Old 12-12-2012, 02:29 PM   #9
Ruthlessone3k
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Quote:
Originally Posted by ryannel2003 View Post
That seems high. When I'm driving at 60MPH my car does about ~2200RPM's or so. I don't travel at those other speeds frequently so I don't know what they would be.
Thanks for the reply, which trany do you have?
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Old 12-12-2012, 02:40 PM   #10
ryannel2003
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It's the GM unit.
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Old 12-12-2012, 02:44 PM   #11
Ruthlessone3k
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Thanks. I'll try the 60mph run again tomorrow on level ground and see what my exact results are. I suspect it is slipping a bit though giving me higher than normal RPM's
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