Fuel pressure?

[oneupmotogarage]

I'm running an aftermarket tank on a custom RC390 with an external adjustable fuel pump and regulator. I'm running the pressure at 50psi right now because I had read that was stock but I just stumbled upon something that said 2.7 bar which equates to about 39psi. So I was hoping someone on here could clear that up for me. What PSI should I have my regulator set to.



~2015 RC390,
~K&N pod filter
~handmade exhaust w/ Lossa Engineering muffler
~1,000ft elevation
~PCV
~Wide Band 2

 

[green_bread]

Sounds like a great question for Chad Wells at KTM Performance. Give him a call... +1 (502) 568-2666

 

[chevaliernoir]

It should be between 2.5 and 2.9 bar (36 to 42 psi), as stated on
https://drive.google.com/file/d/0B_bSQZLvs537LUJsaUJGZG5DRWs/view?usp=sharing

 

[chevaliernoir]

By the way, instead of changing injector for higher flow (this is quite expensive, and I would check the targetting (direction an shape of the spray) before a change, and the atomisation is surely worse than the original one)
why not changing the fuekl pressure regulator, as it is cheap, and the deviation expected is well known :
Going from 2.7 bar to 3.5 bar increase the flow by 14% (Maybe this is enough for engine prepared and extended rpm range?