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[lilcoot]

I have a '12 SESG with a TTS Mastertune that I had dynotuned a couple months ago.  Before the tune, I rode it several hundred miles on a canned map that hd_dude (Jim) provided, and it ran pretty well.  Since getting it dynotuned, gas mileage dropped to 31-32 mpg.    I've checked the tire pressures, which are good. 

It never did get good gas mileage;  averaged about 38 mpg when new, with 44 mpg being the best I ever got.  Got about 37-38 with the canned map.  I tend to be a little heavy handed. 

Has anyone else noticed a big change in mpgs after a dynotune?  I was hoping the gas mileage would get better, not worse.

I suspect the A:F ratio is a little lean, because I've noticed a little backfiring on decel, and the oil temps are running 10-20 degrees hotter than before (but not nearly as hot as it ran stock).

Thanks,

Dan

[murphy]

Mine got worse after tuning also.

[Cvostu]

well you are adding more gas,,,

[timo482]

look at the map - is it running closed loop most of the time? or open loop rich most of the time?

makes a gigantic difference in milage

of course my personal experience is that the throttle position makes the most difference in milage. if i cool my jets i get wayyyyy better milage than if im even sort of hot dogging.

to

[Dead_Reckoning]

I have a '12 SESG with a TTS Mastertune that I had dynotuned a couple months ago.  Before the tune, I rode it several hundred miles on a canned map that hd_dude (Jim) provided, and it ran pretty well.  Since getting it dynotuned, gas mileage dropped to 31-32 mpg.    I've checked the tire pressures, which are good. 

It never did get good gas mileage;  averaged about 38 mpg when new, with 44 mpg being the best I ever got.  Got about 37-38 with the canned map.  I tend to be a little heavy handed. 

Has anyone else noticed a big change in mpgs after a dynotune?  I was hoping the gas mileage would get better, not worse.

I suspect the A:F ratio is a little lean, because I've noticed a little backfiring on decel, and the oil temps are running 10-20 degrees hotter than before (but not nearly as hot as it ran stock).

Thanks,

Dan

I am thinking "You Tuned it for Performance" di you not? Were you looking for Fuel Economy?
My SERK got 40 to 44, depending on whom i rode with before Dyno Tune.
Now I am in the 35 - 40 Range, depending on whom I ride with. I do have a bigger smile though.

[Midnight Rider]

If I were guessing, I'd say your tuner set the bike up to run in open loop ALL the time.  A lot of "old school" turners are apt to do that...

[SDCVO]

I had the same issue. My tuner did a amazing job getting me 95HP and 121 TQ with just a SERT and Fatcatz with amazing throttle response and overall fantastic performance. I am thrilled with everything he did with 1 exception, my gas mileage sucks.. I am running between 30-35 mpg pretty much anyway I run. When I am by myself, I could care less. The difference on a couple of bucks in gas really means nothing to me for the performance I am getting with virtually no mods The problem I have id that I ride with my brother in law 90% of the time and he is getting 8 mpg better then me and it is a nuisance that we always have to "get gas" long before he has to.
Looking to talk my brother in law to get a S&S 124 with me so we will both "have it all"..

[hbens]

My mileage went down with the mods too. I generally get between 32-36 when I ride by myself. I love the acceleration and mileage is simply something to keep tabs on.
When I ride with my wife on and in a pack I am not leading I tend to get 38-40 mpg. My throttle hand has the biggest affect on fuel mileage. 

[GtreetSlide]

Mine got worse after tuning also.

Just did a tune on a 2011 trike (Lambda system) and the more I tuned the worse it got.... Turned out both the O2 sensors were in the wrong pipes... a better tune should mean richer, running cooler, and most cases better mpg and power....

[warwick]

a better tune should mean richer, .........., and most cases better mpg

Flies in the face of logic IMHO 

[North Star]

Mine got worse after tuning also.

...could be your tuner....

[cvobiker]

I was averaging 42-44 with my passed 131 putting out 130/132.  If I was you I'd go back to your prior tune.   Who did your dyno tune?   You must of instructed tuner for full out power. 

[grc]

Find a top notch fully trained professional tuner, not the kid at the local Harley shop who got the one day class from DynoJet on how to hook the bike up to the drum and run the machine.  A REAL tuner can give you good cruise economy AND good acceleration and wide open throttle peformance at the same time.  Never forget a basic truth; anyone with the cash or credit can buy a dyno, the dyno company doesn't require proof of competency before selling anyone their machine.  There are a whole lot more dynos out there than there are fully qualified tuners.  There are dyno operators, then there are tuners.  Anyone can be taught to hook a bike up and run the bike through the gears and produce a chart.  Not everyone can be easily taught combustion theory and proper tuning methods. 

Jerry

[sadunbar]

I have a '12 SESG with a TTS Mastertune that I had dynotuned a couple months ago.  Before the tune, I rode it several hundred miles on a canned map that hd_dude (Jim) provided, and it ran pretty well.  Since getting it dynotuned, gas mileage dropped to 31-32 mpg.    I've checked the tire pressures, which are good. 

It never did get good gas mileage;  averaged about 38 mpg when new, with 44 mpg being the best I ever got.  Got about 37-38 with the canned map.  I tend to be a little heavy handed. 

Has anyone else noticed a big change in mpgs after a dynotune?  I was hoping the gas mileage would get better, not worse.

I suspect the A:F ratio is a little lean, because I've noticed a little backfiring on decel, and the oil temps are running 10-20 degrees hotter than before (but not nearly as hot as it ran stock).

Thanks,

Dan

I see you're in So Cal.  If you can travel a bit north, one of the best tuners in the business is located in Hayward, Ca.  Bob Lobenburg at RC Cycles... 

[SBB]

I see you're in So Cal.  If you can travel a bit north, one of the best tuners in the business is located in Hayward, Ca.  Bob Lobenburg at RC Cycles... 

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