How smooth is low RPM supposed to be

[Firebolt Pal]

This is my second year with my Buell and second year overall riding. This year I have finally been getting into some modification and restoration (previous owner screw ups) efforts. So far I have added HID headlights, breather re-route and some minor cosmetic touch-ups.

Some background that I can gather from the previous owner is that it has a race ECM, race exhaust, and should be it.

My question is how smooth should low RPM riding be, such as leaving my neighborhood. When in first it seems like I have to be consistently accelerating in order to feel any sort of smoothness. Now I am not sure if it is because I need a TPS reset that I keep reading about and have no idea what exactly it does. But I feel the bike should be a little smother than this.

 

[Stevenc150]

When in first it seems like I have to be consistently accelerating in order to feel any sort of smoothness.

That's a V-twin, Harley-hearted Buell. Custom mapping is your best bet for smoothness & keeping RPMs above 3K.

 

[ct1200]

Its a BIG twin, anything below 3k is going to be shaky.
And its like that with just about any liter twin, some more some less.
But the timing on the old sporty motor doesn't help either.

 

[Firebolt Pal]

Yeah I know getting into a buell, it would be a beast with the v-twin, guess I just underestimated it. Any suggestions on what kind of mapping??

 

[ich]

no problem to ride a cold engine at 20 mph in 2nd if mapped correctly.
get ego corr as close to 1.0 as possible.
increase decel fuel cut region to min rpm > 2000.
reduce spark advance @ 2k rpm to ~12-15.
adjust idle corr, idle spark adv as required if low temp and high temp idle engine speed differ too much.

 

[anrkizm95]

That's a V-twin, Harley-hearted Buell.

[up]

 

[Firebolt Pal]

Thanks ich, once I get a cable I will have to play with ECMspy, but just got that downloaded today and looks a little confusing.

 

[CBi]

Remember, the race ECM was originally designed for track use.

It's going to chug, spit and cough a little at low RPM once in a while.

Keep the revs up, around 3k like others said.

 

[williegoat]

My XB9 is relatively smooth and perfectly useable anywhere above 2000 rpm in the first three gears and my S3 is useable, though somewhat less smooth than the XB, above 2200. Both have "race only" maps.

 

[Firebolt Pal]

Does the race ECM really add that much power?? I generally take my bike out to the store, gym and general errands around town. I am not a racer by any means, just a day to day rider that loves the sound of the v-twin.

 

[wolfo68]

It doesn't add power, it's just a map designed for better airflow and it smooths out the ride.

It is a noticeable difference.

 

[ct1200]

I actually think the EBR Race ECM made a huge difference in street drive ability to my xb.
It made the entire usable rpm range much smother, but thats also what you want at a track, consistent predictable power delivery.

 

[CrazyTexan]

Harley Davidson...Keeping Lock-tight in business for over 100 years.

 

[williegoat]

Harley Davidson...Keeping Lock-tight in business for over 100 years.

 

[Xb12armyguy]

Mine runs smooth at 2200 rpms in 2nd gear, first is jerky below 2500