Tuning SERT for better gas mileage?

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Nov 4, 2009 | 05:28 PM

jimclaypool

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From: Virginia

Tuning SERT for better gas mileage?

Is there something simple to tune a SERT for better gas mileage? My '07 Ultra (SEAC and SE exhaust) gets in the 40-45 mpg range on country roads running 45-50 mph. Get on the Interstate doing 75-80mph and my gas mileage drops to 35mpg or less. That is what I experienced this summer on a 7,000 mile trip over 21 days out west. I just uploaded the one canned map for my set up. Bike runs great, but I would like better mpg on the Interstates. I think I just need to change a few of the a/f ratios on the map, but not sure where to start. Any help?

Jim
07 Ultra

Nov 4, 2009 | 08:07 PM

Shovelhead Bob

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You need to have the VE tables and the CLB tables dialed in....

Best way to do it is to invest in a QUALITY Dyno Tune session...

A canned map is just a STARTING POINT... for optimum power, performance and economy, you need to get it tweaked in...

Nov 4, 2009 | 09:02 PM

producer

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From: Mnpls MN

Quote:

Originally Posted by Shovelhead Bob

Ditto to you Bob.
I want to add something. If you have the time and some extra money, maybe consider porting your stock heads and a slight bump in the cam. you will be surprised at how much better gas mileage you will get with that extra power.

I'm very happy with what I did to mine. Just an example and I wouldn't recommend this as a test for mileage; but this past summer I ran one leg of a trip at 80-89 miles per hour and I still got 42 miles per gallon. Now, I'm running a 6 speed SE transmission too. But when you consider my big fat ultra fair sail that's pretty good.

Nov 5, 2009 | 09:33 PM

jimclaypool

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From: Virginia

Quote:

Originally Posted by Shovelhead Bob

Bob, I hear you, BUT, is there not something that I could try that may help. I am very happy with the power and performance of my Ultra currently. It is loaded with the canned map #78. I am thinking that if I just lower the CLB table values for both cylinders in the 2000 & 2500 rpm in the 30-60 kPa range that I should see an economy improvement on cruising on the interstates. What do you think about that?

Thanks for any help

Jim

Nov 6, 2009 | 06:52 PM

Shovelhead Bob

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Quote:

Originally Posted by jimclaypool

You don't lower the CLB numbers, you raise them to get a fatter, but more responsive Closed Loop area.... That still gets good mileage...

But... The VE's still need to be accurately dialed in to maximize the effect...