Wow this is a great forum. Hey got a problem with Gas Milleage. It's never been right.

History:

Bought my 07 Street Bob used, the guy had all the service paperwork. At 400 miles he put on Rhinehart slip-ons, SE Stage 1 A/C, SE EFI Race Fueler (not Tuner), and had it dyno'd at his dealer.

I bought it with 800 miles on her and now she has 1400. At 1000 I put in SE Synthetic in all three places.

The entire time I've owned her (4 months now) I've only gotten about 25 MPG in the city. HW is about 35. Every post I've searched on this forum says people with similar mods are getting 38-45 city! What could be wrong?

I'm at 6500 feet elevation, the bike runs smooth, no bogs, no black unspent fuel fumes out the exhaust. My plug pictures are attached and so is the dyno chart. Hoping you can diagnose it from the pics and maybe someone could interpret the chart for me...it looks like a before only chart, am I right? If stock torque was 92lbs, why is this showing less with these mods?

Help...Dealer wants to redyno without even looking at it and that's 288 bucks!

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Based on your 25mpg & those plugs...I'd say you are running a tad rich....just a tad... Does the inside of your exhaust tips have any black soot? Now before you spend the $$ for the dyno..go get yourself a K&N air filter for your SE A/C and see if that changes anything. Just a thought.

FWIW I am getting 40 & 44mpg with the stage1 SERT and a Latus HD map.

 

Rubbed my finger in the tips of the exhaust and they came out pitch black soot on both.

Man, I really don't want to take it in and have them screw it up again like they obviously did the first time for close to 300 bucks. Do you think that between the 400mile and 1400 mile mark the break-in affected their dyno tune? Maybe I'll try to tackle the Fueler myself.

 

Start simple. Check your plugs and double check the gap.

 

The plugs don't really look all that bad. A little dark around the edges, but the ceramic looks near white on one and dark tan on the other. Have you checked your speedometer/odometer for accuracy? My buddies '08 seems to be off after having the dealer do the tune and stage 1. Don't worry too much about the soot on your finger, I get 38mpg with my LR and the pipes are still sooty.





Mike

 

If you want great milage.I would sell the race fuelerand add Xied from nightrider.com leave the slip ons and aircleaner. This would be something you could do yourself plug and play.

 

I checked into XIED. Seems like it would be lean at WOT or anything above Mid throttle with my SE1 A/C and Pipes. I'm seriously considering the Thundermax EFI Autotune package right now, I know that will fix it all (700 bucks though!) but won't have to see the dyno no matter what I mod or change. People seem really happy with that thing. I know they are at both ends of the spectrum, but can someone give me a comparison of the two (XIED vs Thundermax)?

 

Those plugs are black! Your running way rich. Dont even look at the ceramic part, that tells nothing. The ring at the botom of the threads is what you need to be reading, and yours are black!

Cheers... Ben.

 

You have to remember that the delphi FI is running closed loop under approx 40% throttle and 4000 rpm this is just about all riding conditions. When the ecm switches to open loop harley already has the engine running rich this area of the map is not tightly controlled by the EPA. Since emmisions testing is done in the closed loop portion. Thundermax has its own set of problems the main one is you lose the factory knock sensing abilty and fuel mileage is down with tmax as well. I am am running Xied on two bikes and its working great with both. I am just a happy customer. Most Harley dealers also don't support tmax if you break down away from home your on your own to repair.

 

I agree those plugs are very rich. You read the plug above the first thread as you stated. The fuel mileage also says the bike is too rich he should be getting in the 40's.