Top speed in gears?

3liter1 · 07-27-2009, 08:08 PM

Sorry for the simplistic question, but 1 hour of searches is coming up empty. Anyone know where I can find the top speed in each gear (manual transmission) for the 128 and the 135??

x97Melbourne · 07-27-2009, 08:17 PM

When Road and Track magazine tests car they publish that. I saw it for the 135i in a past issue....for the 2008 model. Do a web search see if it comes up.

wnta135 · 07-27-2009, 08:20 PM

Keep searching, I posted graphs about a year ago showing exactly what you want but I didn't find them either

wnta135 · 07-27-2009, 08:27 PM

Search for something like this:

RPMs at 80 mph in 6th (manual) 135i. Anybody???

ibeam81 · 07-27-2009, 08:29 PM

Here's the datasheet from R&T's review of the 135i in May 2008. It includes the top speed in each gear.

Citizen Z · 07-27-2009, 09:42 PM

Punch the drive ratios from the chart into this calculator and you get 194mph max speed, ignoring drag.
300 wheel horse power is plenty enough to get a 1er within sniffing distance of 170mph once you factor drag.

http://www.catherineandken.co.uk/sti/tyres.html

esses · 07-27-2009, 09:43 PM

Looks like R&T has the ratios right, but they count redline at 7000 flat and don't tell you what you can do without the governor.

My scribbles say 42, 72, 109, 144, 172, and 197(!). Theoretical, of course. I seem to recall some posts on these boards where someone did the math to adjust for drag.

3liter1 · 07-27-2009, 10:06 PM

Thanks Everyone!
Using two methods: #1 the link posted by Citizen Z above , and #2 some research yielding the formula:
MPH = (rpm x tire diameter)/(gear ratio x 336).

I backed into the below numbers. Tire diameter I used is 24.5 inches.
Results are closer than I expected to the 135 posted by Road and Track

128i
3.23 final drive

gear ratio overall mph (Calc) rpm
1 4.32 13.95 36.6 7000
2 2.46 7.95 64.2 7000
3 1.66 5.36 95.2 7000
4 1.23 3.97 128.5 7000
5 1.00 3.23 158.0 7000

Tom K. · 07-27-2009, 10:24 PM

Rounded at the 7,000 redline and using a tire diameter of 24.88", I came up with:

1st = 37 mph
2nd= 66
3rd = 97
4th =131
5th =161
6th =190

(5th & 6th are theoretical, of course)
Tom

cagekicker · 07-27-2009, 10:44 PM

damn, you guya are good.

CrazyIvan · 07-27-2009, 11:10 PM

I wonder if you can calculate top speed for a reverse as well

wnta135 · 07-28-2009, 07:12 AM

^
Yes, using 3.68 as the ratio gives 47 MPH
Better hang on that could be exciting

Lester · 08-01-2009, 10:05 AM

Here it is

07-27-2009, 08:08 PM	#1
3liter1 First Lieutenant 57 Rep 376 Posts Drives: 2019 X3 Join Date: Aug 2008 Location: Northern NJ iTrader: (1)	Top speed in gears? Sorry for the simplistic question, but 1 hour of searches is coming up empty. Anyone know where I can find the top speed in each gear (manual transmission) for the 128 and the 135??
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07-27-2009, 08:17 PM	#2
x97Melbourne Molar World 47 Rep 916 Posts Drives: 2016 435i Coupe Join Date: Apr 2008 Location: Florida iTrader: (0)	When Road and Track magazine tests car they publish that. I saw it for the 135i in a past issue....for the 2008 model. Do a web search see if it comes up. __________________ Current: 2016 435i Coupe Previous: 2014 335i Sedan; 2013 328i Cv, 2011 335i Sedan Gone But Not Forgotten: 2008 135i Convertible (my favorite)
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07-27-2009, 08:20 PM	#3
wnta135 Private First Class 2 Rep 194 Posts Drives: 2008 Sedona Red 135i Join Date: Nov 2007 Location: South Carolina iTrader: (0)	Keep searching, I posted graphs about a year ago showing exactly what you want but I didn't find them either
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07-27-2009, 08:27 PM	#4
wnta135 Private First Class 2 Rep 194 Posts Drives: 2008 Sedona Red 135i Join Date: Nov 2007 Location: South Carolina iTrader: (0)	Search for something like this: RPMs at 80 mph in 6th (manual) 135i. Anybody???
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07-27-2009, 09:42 PM	#6
Citizen Z Alpine Master 111 Rep 1,310 Posts Drives: '08 135i AW Sport Join Date: May 2008 Location: Kansas iTrader: (1)	Punch the drive ratios from the chart into this calculator and you get 194mph max speed, ignoring drag. 300 wheel horse power is plenty enough to get a 1er within sniffing distance of 170mph once you factor drag. http://www.catherineandken.co.uk/sti/tyres.html __________________ Alpine White with Taupe Leather 135i, Sports Package, Heated Seats, Comfort Access, iPod Adapter Fastness: http://www.1addicts.com/forums/showthread.php?t=252727
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07-27-2009, 09:43 PM	#7
esses • 19 Rep 709 Posts Drives: like I stole it. Join Date: Apr 2008 Location: Bay Area iTrader: (1)	Looks like R&T has the ratios right, but they count redline at 7000 flat and don't tell you what you can do without the governor. My scribbles say 42, 72, 109, 144, 172, and 197(!). Theoretical, of course. I seem to recall some posts on these boards where someone did the math to adjust for drag. __________________
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07-27-2009, 10:06 PM	#8
3liter1 First Lieutenant 57 Rep 376 Posts Drives: 2019 X3 Join Date: Aug 2008 Location: Northern NJ iTrader: (1)	top speed estimates Thanks Everyone! Using two methods: #1 the link posted by Citizen Z above , and #2 some research yielding the formula: MPH = (rpm x tire diameter)/(gear ratio x 336). I backed into the below numbers. Tire diameter I used is 24.5 inches. Results are closer than I expected to the 135 posted by Road and Track 128i 3.23 final drive gear ratio overall mph (Calc) rpm 1 4.32 13.95 36.6 7000 2 2.46 7.95 64.2 7000 3 1.66 5.36 95.2 7000 4 1.23 3.97 128.5 7000 5 1.00 3.23 158.0 7000
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07-27-2009, 10:24 PM	#9
Tom K. Major General 124 Rep 5,627 Posts Drives: '07 328iT, '13 Boxster Join Date: Mar 2008 Location: Maryland iTrader: (0)	Rounded at the 7,000 redline and using a tire diameter of 24.88", I came up with: 1st = 37 mph 2nd= 66 3rd = 97 4th =131 5th =161 6th =190 (5th & 6th are theoretical, of course) Tom
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07-27-2009, 10:44 PM	#10
cagekicker Major 16 Rep 1,335 Posts Drives: '09 crimson red 135i Join Date: Nov 2008 Location: miami (vice city) fl. iTrader: (0)	damn, you guya are good. __________________ 6MT/ Sport Package/ N54/ Asa wheels/ Eibach pro kit springs/ Active autowerke Exhaust/ 35% tint
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07-27-2009, 11:10 PM	#11
CrazyIvan Lieutenant 29 Rep 488 Posts Drives: 2011 E90 M3 Join Date: Jul 2009 Location: MD iTrader: (0)	I wonder if you can calculate top speed for a reverse as well __________________
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07-28-2009, 07:12 AM	#12
wnta135 Private First Class 2 Rep 194 Posts Drives: 2008 Sedona Red 135i Join Date: Nov 2007 Location: South Carolina iTrader: (0)	^ Yes, using 3.68 as the ratio gives 47 MPH Better hang on that could be exciting
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08-01-2009, 10:05 AM	#13
Lester Brigadier General 295 Rep 3,350 Posts Drives: Join Date: Oct 2007 iTrader: (0)	Here it is Attached Images
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