2.5i 5MT gearing ratios?

sikedsyko · 09-23-2016, 11:26 AM

Just out of curiosity, can anyone tell me what revs your engine is at when you're cruising at 80mph in 5th? The Z4 I just bought is at ~3700 at 80mph, which seems really high to me and I was wondering if it has a shorter than factory final drive gear. Seems like this motor should be able to handle ~3000rpms at 80mph just fine.

Steeler · 09-23-2016, 04:49 PM

Quote:

Originally Posted by sikedsyko

Just out of curiosity, can anyone tell me what revs your engine is at when you're cruising at 80mph in 5th? The Z4 I just bought is at ~3700 at 80mph, which seems really high to me and I was wondering if it has a shorter than factory final drive gear. Seems like this motor should be able to handle ~3000rpms at 80mph just fine.

My 3.91 6 speed tachs 3k at 70mph.
Looks like your 5 speed is not overdriven

I would love to have that 0.69 as an overdrive gear.

sikedsyko · 09-23-2016, 06:52 PM

Thanks for the info. The gearing in this car is definitely not setup for fuel economy.

kaanb34 · 10-18-2016, 10:48 AM

Mine is the same way, I talked to my mech and he said nothing to worry about, so I stop thinking about it.

09-23-2016, 11:26 AM	#1
sikedsyko Private 41 Rep 75 Posts Drives: 2005 Z4 Join Date: Jul 2015 Location: Houston iTrader: (0)	2.5i 5MT gearing ratios? Just out of curiosity, can anyone tell me what revs your engine is at when you're cruising at 80mph in 5th? The Z4 I just bought is at ~3700 at 80mph, which seems really high to me and I was wondering if it has a shorter than factory final drive gear. Seems like this motor should be able to handle ~3000rpms at 80mph just fine.
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09-23-2016, 06:52 PM	#3
sikedsyko Private 41 Rep 75 Posts Drives: 2005 Z4 Join Date: Jul 2015 Location: Houston iTrader: (0)	Thanks for the info. The gearing in this car is definitely not setup for fuel economy.
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10-18-2016, 10:48 AM	#4
kaanb34 New Member 6 Rep 12 Posts Drives: Bmw E85 Z4 Join Date: Dec 2015 Location: Riverside iTrader: (0)	Mine is the same way, I talked to my mech and he said nothing to worry about, so I stop thinking about it.
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