Highway rpm, reduced mpg's.... - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 26 Old 10-26-2013, 12:02 PM Thread Starter
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Highway rpm, reduced mpg's....

I'll start off by saying I've got a 40 to 50 minute commute each way with 2 route options. The shorter time route involves all highway and the longer, more twisty back roads.

The highway route involves me doing about 72 mph at about 5500 rpm (sounds like she's straining) and yields about 41 mpg.

The "fun route" averages 45 mph and I get about 53 mpg.

My question: Can I change sprockets to lower my highway RPM's and raise my mpg's without hurting lower gear performance? (I'm not opposed to getting longer use out of each lower gear...seems like I'm only in them for a second or two since I'm doing no off-roading at all)

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Last edited by JPilot; 10-26-2013 at 12:05 PM.
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post #2 of 26 Old 10-26-2013, 12:23 PM
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I reckon changing the chain sprockets has negligible effect on the fuel consumption. xx mph needs a certain amount of power to overcome the drag from riding at xx mph, and unless the sprocket change takes the engine into a better ie more fuel efficient zone then I don't think it'll change the fuel conaumption.

I put a 16T on the front to get a more accurate speedo, and this has the benefit of shifting the 4700 rpm buzz to around 65 mph which is better for me.

Last edited by Oop North John; 10-26-2013 at 01:31 PM.
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post #3 of 26 Old 10-26-2013, 12:36 PM
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Lowering the rpm also lowers the horsepower at that rpm which requires more throttle. People who have changed sprockets have reported no discernible change in mpg.

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post #4 of 26 Old 10-26-2013, 06:05 PM Thread Starter
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Lowering the rpm also lowers the horsepower at that rpm which requires more throttle. People who have changed sprockets have reported no discernible change in mpg.
Can I attribute the drastic drop in fuel economy to speed, or the engine operating at a higher (possibly less efficient) rpm?

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post #5 of 26 Old 10-26-2013, 06:31 PM
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Can I attribute the drastic drop in fuel economy to speed, or the engine operating at a higher (possibly less efficient) rpm?
Biggest factor is extreme wind drag at those speeds.

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post #6 of 26 Old 10-26-2013, 06:57 PM
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Speed kills fuel economy. Bikes are much more aerodynamically dirty than cars. Pushing the air around the bike and rider is the biggest factor. Stuff sticking out on the bike or rider and cooler, denser air make it worse.

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post #7 of 26 Old 10-26-2013, 08:40 PM Thread Starter
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Thanks guys

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post #8 of 26 Old 10-26-2013, 11:09 PM
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If you want really amazing fuel economy, really easy on acceleration, get into 6th @80 kph and just sit there.

Changing the front sprocket probably won't make a big difference, but unlike the earlier model, low rpm's do improve economy - but as others have said, only up to a point, wind drag is the killer.

FWIW. On the more open backroads around here I can just stay in 6th @80kph, even in the corners, I'm actually faster than I am thrashing the gearbox because I'm a lot smoother and corner speeds are higher. (That's not competing with other bikes, just 'cruisin.)

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post #9 of 26 Old 10-27-2013, 01:17 AM
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I lose about 7 mpg with the boxes at freeway speeds. I'm hoping to get a top box soon to see if it's better than the OEM side boxes.

+1 sprockets won't change mpg.

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post #10 of 26 Old 10-27-2013, 11:49 AM Thread Starter
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If you want really amazing fuel economy, really easy on acceleration, get into 6th @80 kph and just sit there.

Changing the front sprocket probably won't make a big difference, but unlike the earlier model, low rpm's do improve economy - but as others have said, only up to a point, wind drag is the killer.

FWIW. On the more open backroads around here I can just stay in 6th @80kph, even in the corners, I'm actually faster than I am thrashing the gearbox because I'm a lot smoother and corner speeds are higher. (That's not competing with other bikes, just 'cruisin.)

Pete
I agree with the 80kph in 6th. That's pretty much what I do when I take the scenic route.

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