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post #31 of 37 (permalink) Old 11-27-2012, 07:57 PM
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I don't have a tach. Is there anybody that either knows or can tell me how to figure RPM based on MPH and what gear you are in on my 07 883C?

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post #32 of 37 (permalink) Old 11-28-2012, 04:52 PM
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I have yet to reach 5,000 miles on my 883 Iron and it manages 54 to the gallon (imperial) when I commute at 60-70 mph. That's a mix of 30 miles on country lanes and 90 miles on the motorway. I can get the mpg lower though

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post #33 of 37 (permalink) Old 12-06-2012, 07:19 PM
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First post on this forum!!! (can't tell you how long i've been looking for a good harley forum).

But anyways, I don't know what you guys who are getting low mpg's are doing but i'm averaging 47-49 mpg's mixture of highway and city on my '98 carbed 1200, (i guess more highway)
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post #34 of 37 (permalink) Old 12-06-2012, 10:40 PM
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Welcome snortster, now go introduce yourself!

At this point I am getting 43 +- mpg on my new 1200 custom.
I'll have a tach sometime and I hope I can better the mpg's.

I am getting the low fuel light at around 70 miles on my 4.5 gal tank.
Not sure whats going on there...

But I have never bought a bike for mpg's. Just fun.
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post #35 of 37 (permalink) Old 12-08-2012, 06:42 AM
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Originally Posted by 02sportytex View Post
The high RPM deal only works on an engine with smaller pistons. For instance an 883 running at 4500 rpm will get better gas mileage than a 1200 running 4500. Running low rpms equals better gas mlg unless you are running at 30 mph in 5th gear and pushing so much fuel to get it up and going. running low rpm in normal conditions will equal better fuel economy than running high rpms.
You Guyz miss understood me I think, all of you, not just you Sporty.

I was refering to fuel burn rate during acceleration..

When you settle on a cruise speed and the AFR goes all lean your running as
efficiant as you can be. The problem is how you use the engine to accelerate..

Say wit me boyz..

The super simple version:
Going for power down low on the tac is NOT efficiant.
You are dumping X amount of fuel and pushing up speed with
the climbing torque. New riders often turn the throttle up,,then
need a bit more so they turn a little more and wait for the added
acceleration to happen. All this time riding rich as hell on the fuel
tables and getting little in return..

20 to 50 mph In a given distance/time swinging the tac from 2,500
to 3,500 (staying above lugging of course),,,
with what ever gears you choose burns more fuel.
The throttle must be held open more as In a greater percentage
of total throttle range,,,more fuel.. for a longer duration.

20 to 50 mph with the tac swing at 3,000 to 5,000 happens ALOT
faster with ALOT less throttle twist and ALOT less time/duration
spent with the throttle so open..

I am NOT saying I or you should turn 5 grand in traffic,,follow me ?

You dump/burn LESS fuel for each acceleration between street lights
and such because you are on acceleration throttle position for a
shorter time duration and at a lesser/lower throttle pos.....

I still cruise at the same rpms as we all do...
I go for 5th gear at 55 But I will drop to 4th if I need anything
more than cager crawl acceleration..

Shifting/accelerating with 1,000 rpm's MORE on tap gave me
consistantly more MPG's to the tune of about
10-12% at all speeds and in all conditions.

When you operate the bike especially In traffic It will be more efficiant
in the middle of It's power/torque range and that my friends
is ABOVE 3,500 rpms....

REMEMBER what I say applies ONLY during acceleration NOT cruising along....

Look at the 1200 gear chart and look at the rpm in 4th at 45 mph and then
without a gear change look where the rpm Is when you accelerate to 50 mph.
I see Riders use these throttle positions and gears at 40 mph,,,

Now look again at the same speed range and rate of change and RPM range when you downshift to 3rd.....

Now yer talkin,,thats where my engine want to be,,
Not Grunting my fried chicken eatin ass up faster but
Spinning up with less effort..

Here Endeth The Lesson...

Yeah Yeah I know, I'm an arrogant S.O.B. ain't I
Attached Images
File Type: jpg 1200MPHCalc.jpg (50.0 KB, 15 views)
File Type: jpg 883MPHCalc.jpg (49.7 KB, 10 views)

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post #36 of 37 (permalink) Old 12-08-2012, 11:03 AM
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kinda new here on the forum but one surefire way to ssstretch

your gas dollar some would be to do a 1200 to 883 conversion , just bring your low mileage '12 1200 to my local HD and we'll work a swap.
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post #37 of 37 (permalink) Old 12-08-2012, 02:01 PM
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Originally Posted by Ralph in La. View Post
your gas dollar some would be to do a 1200 to 883 conversion , just bring your low mileage '12 1200 to my local HD and we'll work a swap.

Thats Like going to the doctor and complaining that your 'Tool' is too big.......

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