Eu Pclll

you don't need it just for a K&N filter. that is a myth.
the stock bikes run very lean from 1000 to 3500rpm.
the PCIII or PCV will tune this back to the best AFR for
the bike to run at, with out getting hot spots internally.
when you change the stock exhaust, you de-tune the
fuel injection, and end up with rich and lean spots in
the AFR. if you have a big lean spot you can over heat
a valve, or piston crown. so it is more about the AFR
of any mod's you do. the EU bikes are tuned different
than the USA bikes and have a CAT in the 3rd volume.
so this also comes in the play when you retune.
you don't want to plug or supper heat the CAT
when you adjust the AFR.

 

if you let more air in, IE K&N Air Filter, you can end up leaning out your air fuel mixture. Saying you "don't need a fuel management system" is insane IMO.

 

Insane???? Do you mean by that my engine will for sure run so lean with my Supertrapp exhaust and KN filter and stock EFI,that it will overheat and wear pistons,valves etc faster than normal?

 

Sounds like you answered your own question, if that is what you are asking. The insane comment is my opinion that's all. I wouldn't do it, but you can do what ever you like with your bike.

 

My Supertrapp exhaust does NOT have open header. I changed spark plugs last week and comparing the plugs against photos and analysis on the net and i would say that the engine does not run on a lean mixture-quite the opposite in fact. The spark plug had a black and grayish tone which indicate a mixture to the rich side from what i could tell. Remeber the there are differences i fuel here in Norway from the US.Here we fill up with 95 octane,and this i guess could compensate a bit the lean problem.

 

This is the same setup I have... K&N, V5 Suppertrap. the only difference in our bikes is mine has the wide tire.
I don't know how the bike will run at all with out one of the maping computers. I ran mine just for the heck of it without the PCIII, it ran but realy realy bad. I can send you the map I ended up with, it is a comprimize but runns real good and still gets 40 Miles Per Gallon.

 

Awsome twogo! Please send me the map
Still wondering about one thing.The map Dynojet has got for downloading on their site for the Supertrapp V5 is for a stock V5 i guess(?). This means 12 discs in it and closed endcap if i'm not mistaking.I mailed Supertrapp and asked if it would be a great difference if i ride 12 discs with closed endcap contra open endcap.They answered that removing the endcap would be like adding 10 more discs,vica versa if i ride 2 discs and open endcap this will be about the same as 12 discs with closed endcap.So...- if i choose to remove the endcap and keep 12 discs,does this mean i will need another map than the map which is downloadable from Dynojet? i guess this map is for stock V5 with 12 discs and closed endcap.

 

I know this is an old post, but does anyone still have a map for a supertrapp v-5 with a K&N for an 1130cc?

I'm on a VRSCR

 

We highly suggest that when you replace your Stock Exhaust with ANY New Exhaust to have your bike dialed in with a Tuner, (good) or Power Commander (better) or even better a ThunderMax Auto Tuner (best).

And if you get the HD "Tuner" then you have to have your bike to a get it Dyno Tuned (expensive).

With the Power Commander's you don't have to use the Sensor Bungs as they are not needed!

But these Systems actually "dial" the computer to the New Exhaust you put on it, and give you the MAXIMUM Performance for your Bike!

Without doing this you Risk Damaging your Pipes if they are Too Lean or Too Rich! Not to mention what it may do to your bikes Engine.

Replacing your Air Filter with our K&N Filter especially on an "older" bike will also be a good idea as well.

GR