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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > at 80 MPH what RPM are you at?



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      05-04-2010, 12:24 AM   #1
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at 80 MPH what RPM are you at?

Im trying out an LCI e90 AT and it seems to be resting at around 2.4k RPM. Is this what you guys are getting too?
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      05-04-2010, 01:27 AM   #2
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seems about right my 6mt is right about the same.
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      05-04-2010, 01:32 AM   #3
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Yep, on 5th or 6th gear.
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      05-04-2010, 02:07 AM   #4
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6th gear of course. The problem is this was on an 09 LCI e90 AT.... I was expecting near 3k..
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      05-04-2010, 02:11 AM   #5
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I have a 6MT, and generally the RPM's are at 2700-2800 at 80mph in 6th.
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      05-04-2010, 02:14 AM   #6
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3K RPM is 160km/h on my car ( +/- 100mph)
2.5K RPM is 130km/h (+/- 80mph)

AT 6th gear
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      05-04-2010, 12:44 PM   #7
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6MT is around 2750rpm with 265/30/R19
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      05-04-2010, 12:54 PM   #8
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Quote:
Originally Posted by Rotary Rasp View Post
6MT is around 2750rpm with 265/30/R19
Agree.
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      05-04-2010, 12:57 PM   #9
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so it looks like tire size does change it quite a bit, with 19" and 30 profile raising the RPMS?
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      05-04-2010, 01:33 PM   #10
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Quote:
Originally Posted by zsapphire7 View Post
so it looks like tire size does change it quite a bit, with 19" and 30 profile raising the RPMS?
That's going to lower the RPMs.
265/30r19 has a bigger overall diameter than the stock tires so you will hit 80 mph with lower rpms.
This is a good calculator that incorporates tire size.
http://www.boosttown.com/gearbox_dif...calculator.php

Remember that the auto gear ratios are different than the MT.
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      05-04-2010, 01:46 PM   #11
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I just checked and with an auto with 265/30r19 tires, 80mph is done at aprox 2550 rpm. MT is about 2850 RPM.
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      05-04-2010, 03:29 PM   #12
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Quote:
Originally Posted by Mr. 5 View Post
I just checked and with an auto with 265/30r19 tires, 80mph is done at aprox 2550 rpm. MT is about 2850 RPM.
Ahh icic... I thought that the MT was supposed to be at a lower RPM than the AT equivalent? The final gear ratios are 3.08 for MT and 3.46 for AT...
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      05-04-2010, 03:31 PM   #13
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Quote:
Originally Posted by claymore79 View Post
I have a 6MT, and generally the RPM's are at 2700-2800 at 80mph in 6th.
same
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      05-04-2010, 03:34 PM   #14
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The actual transmission gear ratios for the AT is lower than the 6mt in 5th and 6th gear.
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      05-04-2010, 03:55 PM   #15
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Quote:
Originally Posted by zsapphire7 View Post
Ahh icic... I thought that the MT was supposed to be at a lower RPM than the AT equivalent? The final gear ratios are 3.08 for MT and 3.46 for AT...
You got it.
Based on the gear ratios, the AT has a higher theoretical top speed than the MT but the MT might have an easier time of getting to the top and therefore could have a higher actual top speed given the hp is the same in both cars.
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      05-04-2010, 04:08 PM   #16
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Quote:
Originally Posted by DJKhan85 View Post
The actual transmission gear ratios for the AT is lower than the 6mt in 5th and 6th gear.
ahh!! i totaly didnt realize this. I assumed they were the same for some reason and that only the final gear ratio was changed. So even tho the MT final gear is taller, the AT has an overall taller effect with its 6th gear transmission.
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      05-04-2010, 04:31 PM   #17
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at 80 mph, mine sits at about 3000 - 3100 rpm. Thats on 295/20/25, but I also have the quiafe lsd with the auto gear ratio. Was lower when I had the regular 6mt diff, but worth the tradeoff for the extra fun feeling launches.
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      05-04-2010, 04:39 PM   #18
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Quote:
Originally Posted by NJ65 View Post
at 80 mph, mine sits at about 3000 - 3100 rpm. Thats on 295/20/25, but I also have the quiafe lsd with the auto gear ratio. Was lower when I had the regular 6mt diff, but worth the tradeoff for the extra fun feeling launches.
Thats what my 335i sits at too with the 3.46 quaife in my MT. 275/30/19. I was expecting the AT to be ~ the same but it turned out to be much lower ~2.4k so i was surprised.
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      05-04-2010, 05:40 PM   #19
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I'm not sure, but I think the auto has some sort of "overdrive" feature for highway cruising/fuel efficiency. I have no knowledge about how auto vs. manual transmissions work, but that's just what it always seems like when you compare an auto vs. manual tranny car of the same make. Could be the torque converters that auto's have.
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      05-04-2010, 06:02 PM   #20
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My 135i 6mt does 80 at 2800rpms stock.
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      05-04-2010, 08:49 PM   #21
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on my car it's about 32.5 mph per 1000 rpm.
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      05-05-2010, 08:58 PM   #22
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Quote:
Originally Posted by scottp999 View Post
Agree.
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