at 80 MPH what RPM are you at?

zsapphire7 · 05-03-2010, 11:24 PM

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?

Jonny550 · 05-04-2010, 12:27 AM

seems about right my 6mt is right about the same.

AltecBX · 05-04-2010, 12:32 AM

Yep, on 5th or 6th gear.

zsapphire7 · 05-04-2010, 01:07 AM

6th gear of course. The problem is this was on an 09 LCI e90 AT.... I was expecting near 3k..

claymore79 · 05-04-2010, 01:11 AM

I have a 6MT, and generally the RPM's are at 2700-2800 at 80mph in 6th.

Funkmob · 05-04-2010, 01:14 AM

3K RPM is 160km/h on my car ( +/- 100mph)
2.5K RPM is 130km/h (+/- 80mph)

AT 6th gear

Rotary Rasp · 05-04-2010, 11:44 AM

6MT is around 2750rpm with 265/30/R19

scottp999 · 05-04-2010, 11:54 AM

Quote:

Originally Posted by Rotary Rasp

6MT is around 2750rpm with 265/30/R19

Agree.

zsapphire7 · 05-04-2010, 11:57 AM

so it looks like tire size does change it quite a bit, with 19" and 30 profile raising the RPMS?

Mr. 5 · 05-04-2010, 12:33 PM

Quote:

Originally Posted by zsapphire7

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.

Mr. 5 · 05-04-2010, 12:46 PM

I just checked and with an auto with 265/30r19 tires, 80mph is done at aprox 2550 rpm. MT is about 2850 RPM.

zsapphire7 · 05-04-2010, 02:29 PM

Quote:

Originally Posted by Mr. 5

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...

TurboSid · 05-04-2010, 02:31 PM

Quote:

Originally Posted by claymore79

I have a 6MT, and generally the RPM's are at 2700-2800 at 80mph in 6th.

same

DJKhan85 · 05-04-2010, 02:34 PM

The actual transmission gear ratios for the AT is lower than the 6mt in 5th and 6th gear.

Mr. 5 · 05-04-2010, 02:55 PM

Quote:

Originally Posted by zsapphire7

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.

zsapphire7 · 05-04-2010, 03:08 PM

Quote:

Originally Posted by DJKhan85

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.

NJ65 · 05-04-2010, 03:31 PM

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.

zsapphire7 · 05-04-2010, 03:39 PM

Quote:

Originally Posted by NJ65

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.

NJ65 · 05-04-2010, 04:40 PM

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.

new2the3 · 05-04-2010, 05:02 PM

My 135i 6mt does 80 at 2800rpms stock.

jaco · 05-04-2010, 07:49 PM

on my car it's about 32.5 mph per 1000 rpm.

cotmfk · 05-05-2010, 07:58 PM

Quote:

Originally Posted by scottp999

Agree.

+2

05-03-2010, 11:24 PM	#1
zsapphire7 Colonel 104 Rep 2,368 Posts Drives: 08 e92 M3 Join Date: Oct 2007 Location: SF Bay Area iTrader: (21)	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, 12:27 AM	#2
Jonny550 Brigadier General 241 Rep 4,936 Posts Drives: 2012 550i Xdrive Join Date: Feb 2009 Location: Jersey Shore iTrader: (14)	seems about right my 6mt is right about the same. __________________ [SIGPIC][/SIGPIC] .
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05-04-2010, 12:32 AM	#3
AltecBX Colonel 324 Rep 2,663 Posts Drives: BMW 335xi Sedan; BMW M3 ZCP Join Date: Nov 2007 Location: NYC iTrader: (0) Garage List 2018 BMW M3 ZCP [0.00] 2007 BMW 335Xi [0.00]	Yep, on 5th or 6th gear. __________________ 335xi Sedan 6AT \| Weather(70-85°F) \| N54 Tune Comparison Chart \|\| N54 Turbo Upgrade Comparison Chart -PROcede Rev. 2.5 ~ v5 (3/17 maps) / JB4 (8/21 maps) / COBB (Stg2+FMIC LT Aggressive maps) †Procede Map2(UT 45 - IGN 40) Aggression Target 2.0 \| 0-60 in 4.0sec \|\| †Cobb E30 LT (35% Ethanol/65% 93 Octane) \| 0-60 in 3.9sec AR Design Catless DP \| BMS DCI + OCC \| ETS 5 FMIC \| Alpina B3 Trans Flash \|235/265 19" Michelin PSS
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05-04-2010, 01:07 AM	#4
zsapphire7 Colonel 104 Rep 2,368 Posts Drives: 08 e92 M3 Join Date: Oct 2007 Location: SF Bay Area iTrader: (21)	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, 01:11 AM	#5
claymore79 Enlisted Member 2 Rep 39 Posts Drives: 2010 BMW 335I X-Drive Join Date: Jan 2010 Location: Wyoming iTrader: (3)	I have a 6MT, and generally the RPM's are at 2700-2800 at 80mph in 6th.
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05-04-2010, 01:14 AM	#6
Funkmob First Lieutenant 22 Rep 306 Posts Drives: 335i E92 space grey Join Date: Oct 2009 Location: Belgium iTrader: (0)	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, 11:44 AM	#7
Rotary Rasp Lieutenant Colonel 241 Rep 1,857 Posts Drives: 2009 E92 335i 6MT Join Date: Aug 2008 Location: SoCal - Torrance iTrader: (6)	6MT is around 2750rpm with 265/30/R19 __________________
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05-04-2010, 11:57 AM	#9
zsapphire7 Colonel 104 Rep 2,368 Posts Drives: 08 e92 M3 Join Date: Oct 2007 Location: SF Bay Area iTrader: (21)	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, 12:46 PM	#11
Mr. 5 Modder Raider 753 Rep 8,633 Posts Drives: M3 Join Date: Apr 2007 Location: Surf City, HB iTrader: (31) Garage List 2007 e90 335i [8.00]	I just checked and with an auto with 265/30r19 tires, 80mph is done at aprox 2550 rpm. MT is about 2850 RPM. __________________ e36 M3 Coupe, e36 325i Sedan e90 335i--SOLD Best 60-130-------------9.15 Seconds------------------WWW.MR5RACING.COM
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05-04-2010, 02:34 PM	#14
DJKhan85 Major 24 Rep 1,190 Posts Drives: 2011 4dr 6mt Golf GTI Join Date: Jun 2009 Location: Boston Massachusetts iTrader: (1)	The actual transmission gear ratios for the AT is lower than the 6mt in 5th and 6th gear. __________________ 2011 VW GTI 4dr-6mt-Sunroof-Nav-Xenons OLD: 08 335i AW/CR/Poplar 6mt-ZSP-ZPP-ZCW-iPod-iDrive-PDC-Style 230s w/FK 452-Dinan LSD
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05-04-2010, 03:31 PM	#17
NJ65 Private First Class 7 Rep 122 Posts Drives: 2008 Sparkling Graphite 335i Join Date: Feb 2009 Location: So Cal iTrader: (0)	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, 04:40 PM	#19
NJ65 Private First Class 7 Rep 122 Posts Drives: 2008 Sparkling Graphite 335i Join Date: Feb 2009 Location: So Cal iTrader: (0)	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, 05:02 PM	#20
new2the3 Colonel 378 Rep 2,067 Posts Drives: 2020 X3M Competition Join Date: Jun 2006 Location: San Diego iTrader: (0)	My 135i 6mt does 80 at 2800rpms stock. __________________ 2020 X3MC 2009 135i: AW/CR Aluminum Trim, 6 speed, M-Sport, Premium, Heated Seats, Ipod, BMW Performance Pedals, BMW Performance SSK, BMW Performance Exhaust, BMW Performance Grills E93 M3 FSB
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05-04-2010, 07:49 PM	#21
jaco Captain 44 Rep 598 Posts Drives: 2011 E90 M3 SSII Join Date: May 2010 Location: Indy iTrader: (2)	on my car it's about 32.5 mph per 1000 rpm. __________________ Jacob 2015 Chevy SS In 2011 E90 M3 DCT SSII Out
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