Even if you stay stock it is worth being able to modify the mixture.

As others post time and time again, the 2014 onward bikes have been tuned as lean as the MoCo dare. Richening the mixture makes a huge difference to how the engine runs.

 

Very true!!

 

 

Sad to hear... the world is becoming an enslavement... Evils like the EU run by Merkel - dictating to the car / bike industry... till they take away the freedom of travel and self protection. Luckily the WEST is waking up!!

 

A few months later and an update on the FP3 and uneven Sportster engine at lower rpm... The two things I reported on regarding the 2016 Forty Eight are the uneven engine at lower rpm and the "stability" issue .... I'm none the wiser despite many hours of trying out the FP3 - V&H custom maps, Auto tuning etc.etc....

I had a long conversation with my local HD dealer (120 km from me) and this guy knows his Harleys and tuning.... been doing that for many years. He has corrected the surging issue of Sportsters for long now and tomorrow I'm off to him. He does not like the V&H FP3 system and says it is gimmicky at best and explained to me why he has that opinion. Also say that most V&H pipes are no where near as good for HP as they claim.... So tomorrow he will get my 48 on his dyno and do a two run check to confirm his predictions regarding the surging (yes fueling - and HD unevenly fueling the cylinders up to a certain rpm and then switching the sequence after that... so when you tune for low down you get issues in the higher rpm and visa versa...)

As I understand he takes a full 6 - 8 hours of dyno tuning the Forty Eight - taking and making corrections for every 5% throttle... He assures me that the issue will be fixed after his "surgery" .... and if I'm not satisfied he will not charge me.... So let's see.....

 

Well when he is finished you will be able to see and post your table data for us all to see and compare with what we have.

 

For sure...but I've struggled so long with this "surging" issue that my guess is I'm not going to have to pay.... but, let's give the man the benefit of the doubt...

It is just plain bull %%^&t to ride these new Sportsters and not enjoying it because of this issue that comes directly from the HD factory. If this is not remedied, I'm selling the 48.

 

Guess I'm lucky or something, the FP3 worked fine on my bike. No dead spots, smooth idle, no surging, and is still pulling when I've unintentionally hit the rev limiter. I wasn't looking for every ounce of power as I could care less about that. All I know is the FP3 works fine for riders who just want to tune the bike to run with added pipes/mufflers, and hi flow air cleaner.

The FP3 was never was intended to replace a dyno, which is good cause I'd be damned if I'd let someone beat the **** out of my bike on a dyno for 6-8 hours.

 

Never used and FP3 so this is conjecture, but it seems to make me wonder if there might be a problem in the FI system itself on the JWC's bike. Software will not fix a bad injector or sensor, or even an ECU. Just something to consider.

 

The Forty Eight went onto the dyno at the local Harley dealership... and for sure it indicated that up to 3000 rpm the FP3 fueling for the two cylinders are out of sync... Thereafter the two cylinders become rather evenly fueled. This will have to be "hand" corrected with the help of the dyno (11 runs) - the dealer uses Dynojet systems that do not talk to FP3... and it looks like it is a rather better setup than the PF3 from V&H. I'm considering changing the FP3 to the Dynojet setup.... I had the Autotune function active for three tanks of fuel and finished the "learning" just before the dyno run.

There was another Sportster (1200)... basically the same setup as mine (just had a heavy breather - mine is a USA Machine big breather). This Sportster just came from the dyno the previous day - all nicely calibrated via the Dynojet ECU on the bike. The two cylinders were very much in sync but what was surprising was the HP and torque advantages it had over mine. It recorded 74hp while mine was on 58hp....