is it really neccessary to remap?

[kouie]

i own a 2009 harley davidson nightster...i just finished putting on a screamin eagle heavy breather and vance and hines full exhaust kit...it backfired on me a couple of times after my first ride...i talked to vance and hines and they said i had to remap my bike...i read somewhere that it isnt neccessary to remap with newer bikes...which one is it?

[mscuddy]

Yes, you have to re-map the ECM, TPS & MAP sensor to take into account more air flowing through the motor. Backfiring could either indicate an overly lean condiiton, or an exhaust leak somewhere in the system (most likely where the head pipes slip into the collectors). Also check the exhaust pipe flange at the exhaust port. Engine control modules make tiny adjustments for opened up intake and exhaust systems, but not enough to make any difference where roasted valves are a defenite possibility.

Failing to do that might void the warranty, and burn up some exhaust valves down the line. You can lessen this issue by clogging up the pipes with steel wool, but you want that neat ear splitting, car alarm tripping rolling thunder sound, now dontcha...

[Kenneth_Moore]

Originally Posted by kouie

i own a 2009 harley davidson nightster...i just finished putting on a screamin eagle heavy breather and vance and hines full exhaust kit...it backfired on me a couple of times after my first ride...i talked to vance and hines and they said i had to remap my bike...i read somewhere that it isnt neccessary to remap with newer bikes...which one is it?

You need the remap or a Power Commander replacement ECU. If the exhaust change is a one-time deal and you don't plan further mods, go to the HD shop and pay them to do it. They'll charge you for a stupid cartridge that has the new map on it, which they use once and throw away. If you plan further changes to the engine, pony up the $300-$400 for the Power Commander and you can do the same thing with a PC.

[SmokeU]

Originally Posted by Kenneth_Moore

If you plan further changes to the engine, pony up the $300-$400 for the Power Commander and you can do the same thing with a PC.

Assuming he can operate a PC.

[kouie]

Oh...how to operate a pc? Hmmm...sounds tough. Why don't u go **** yourself. If you're not gonna answer my question don't post a reply jackass!

[Kenneth_Moore]

Originally Posted by SmokeU

Assuming he can operate a PC.

I think he has the PC part down ok.

[SmokeU]

Originally Posted by Kenneth_Moore

I think he has the PC part down ok.

I don't know, that has yet to be determined.

[seruzawa]

I think kouie could fit right in here.

[acecycleins]

Kouie- typing in a forum and operating a PC or laptop for re-mapping is just a bit different from one another.
Ultimately, you need to dyno-tune the bike while re-mapping: Why- says the young jedi student?: Because maps are different and your state of tune is everything. Say for example you want peak HP because you like riding at a flat out pace. That map will be different than the map that drives that torque curve. So, ask yourself this question: Do I have enough experience with EFI and a computer to do this without having to put it on a dyno? You may well have that experience, but from your earlier post I'd say you need professional help to sort it out.

[The_AirHawk]

I gotta remap every time I go on a trip - I hate foldin' them things up, and usually end up tearing holes in 'em. Good thing most States have 'em for free at them "Welcome Centers"..............