This is being cross-posted from the Facebook Milwaukee 8 group because of my fear of damage that might be occurring to my bike.

• 2019 FLHTK
• Screamin' Eagle Ventilator Extreme Air Cleaner
• SVT Boneshakers
• Originally dyno'ed at:
  • 85HP and 112ft/lbs. torque

I was lucky enough to get myself a Christmas present of the SE-447 Torque Cam. When the dealership installed it, they overwrote the dyno mapping with HD's own mapping for a similar setup, "rode it for 30 minutes" and re-adjusted the tune. I've ridden ti a couple hundred miles of highways and backroads, keeping track of different things and I am disturbed with a couple findings:

• The engine is getting really hot between my legs
• the MPG has gone UP (way up. I WAS getting 38-40MPG with the dyno tune (at least 80% highway). Now, I'm getting 41.5 MPG in mixed city (40%)/highway (60%) riding and 48MPG strictly highway (as measured by the GTS)!!

The only way I figure that the MPG could have gone up that drastically is that the map they used it really, really lean.
I have the SE Pro Street Tuner and the cable kit, but the dealership has stated that the Pro Tuner is now highly restricted on what it can do (e.g. adjusting the air/fuel mixture is a no-no).
So:

1. How dangerous is this situation? Could I damage the engine?
2. Is it possible to get the bike tuned without screwing up the extended warranty I have?

Thank you for taking the time to read this post.

 

see if I understand this as it's a bit confusing..you added after market slip-ons and SE Ventilator and had it dyno tuned...using SEPST?
then had the HD dealership install the SE 447 cam kit with the SEPST ecm Stage 2 calibration for that?
then ""rode it for 30 minutes" and re-adjusted the tune....meaning they then dyno tuned it with the SEPST?
it now runs great and gets great mpg..but you are concerned they may have messed things up doing the dyno tune?

if this is correct;

I think the SEPST Stage 2 ECM calibration would be very close to performing the same with the SVT Boneshakers instead of their Street Canons but suppose it could behave differently which is why they tuned it afterwards..I don't know how much opportunity exists for them to screw things up badly enough with the SEPST but guessing it would have to run poorly to start with in order to suspect "dangerous engine damage" from becoming a potential issue...you should be running your concerns by the Service Manager and if they had a competent, capable and experienced dyno operator work on it then I would not have any concerns

 

I would say there's zero to worry about. They installed the cam and a tuner with the proper calibration. Then they (apparently) ran a SmartTune session to dial the tune in properly for your intake and exhaust. The result is a strong performing bike that gets even better gas mileage because the tune is properly adjusted.

As far as getting the bike dyno tuned, it all depends on what tuning device is used. If someone tunes it using your HD tuner, then the warranty won't be affected because of it. But if they use any other tuning device, your warranty is gone.

 

Use the SEPT auto tune feature if you're that concerned.

 

Sorry for the confusion. My bad.

I previously had a 2008 FLHTCU with V&H from the exhaust port all the way out and when I put the 255 cams on and had it dyno'd, it pulled like a SOB!! I know the the map never got leaner than 12.5:1 on that bike. The MPG was around 35-38 MPG, but it was so much damn fun to ride!

So, I bought the 2019 FLHTK (December 2018), I had the exhaust/intake put on and then the selling dealer "dyno'd" it. Not sure what they used to tune the bike (this was done by the dealer in Ohio). I assumed the SEPT, but after my current dealer in Tennessee pointed out that the SEPT and associated software could not adjust the air/fuel mixture, timing, etc. using the SEPT, I have no idea what they used or how it was calibrated. Feel like such an airhead now . . . I should know better. My excitement over a new bike blew my whole common sense out of the water. Crap.

So, to reiterate, the original dyno session on the new FLHTK was in Ohio about 1 year ago.

Last week, I had the SE8-447 put on by my new dealer in Nashville. After they put it on, they "downloaded a tune from HD" (yea, probably a Stage II calibration for what closely matched my physical setup). They then road it for about 30 minutes and then ?? the data from the SEPT allowed them to adjust the tune??

I really don't care about the MPG. Having "good" MPG does not necessarily make for a damn fun ride.

It's running hotter than it was and the MPG jumped dramatically. How could the MPG jump if you allow an engine to breath so much better? Wouldn't it need a richer air/fuel mixture to take advantage of the new hardware?

So, let's speculate that it's air/fuel mixture is now a EPA pleasing 14.1:1 to 14.5:1 (which I believe are factory specs). Other than using something like a Power Commander (which will probably blow the extended warranty out of the water) is there anything that can be done to improve the performance of the ride?

Thanks again for your help.

 

Well, the first thing to do is figure out what the first tune was done with. If it wasn't an SE Pro Street Tuner, then your warranty is already gone...

 

sounds like they loaded the Stage 2 base calibration then ran an autotune with the SEPST then loaded that data to the ECM in which case not only would it not cause any problems, rather would make improvements over the base calibration..the only thing left re: "is there anything that can be done to improve the performance of the ride?" would be to have a competent dyno operator tune it with your SEPST or aftermarket tuner if you don't care about warranty...the only aftermarket performance parts you have are the slip-ons and the SEPST can handle adjustments for that

 

a more efficient motor uses less fuel, go ride it

 

I would take it back to the Nashville dealer and voice your concerns, to me with the increase in heat and the extreme change in MPG it does sound like it is running lean.

Make them verify they have the right tune.

it is possible they choose a wide band tune in error