Need Advice for fueling

[oneupmotogarage]

New to this forum, hey everyone!

I'm just starting a custom RC390 for a client and this is the first FI KTM I've messed with, so I am looking for some specs on the fuel delivery system. I'm not running the stock tank and I can't graft the pump assembly into the custom tank due to its size and shape. So I'm left needing to run an aftermarket pump and FPR. The pump I'm not too worried about, I plan to just run a small high pressure one. It doesn't need to put out more than about 50psi correct? Most I've found are capable of about 100psi.

My main question for today is about the FPR. It is built into the pump assembly in-tank, yes? Is it liner or does it adjust based on intake vacuum or input from the ECU? I'm thinking vacuum, or linear would be nice but I don't expect it is. What are the bar or psi specs for the stock regulator with bike off/ idle when warmed up/ and under throttle? Can it be separated from the pump assembly and ran external of the tank?

My second, somewhat related question is about tuning. I'm running a K&N pod filter (no stock airbox) and a hand made mid pipe terminating into some Lossa Engineering mufflers. So it will need a piggy back programmer, which would be recommended for these mods? I've heard mixed reviews on the "autotune" ones. I can have it dyno'd and a map made for it but just want to know what hardware would be the best to work with on that. I do plan on keeping the header stock with the o2 sensor location untouched. The biggest change will be from the pod filter, as air inlet will be much more than stock and I know these ran lean from factory already.

Thanks so much to anyone who reads this and has some advice/ info!

 

[oneupmotogarage]

No one knows? Maybe I can run the stock pump and FPR outside of the tank?

 

[Fasteddy]

Pretty sure it is a linear fuel pressure regulator, I have the manual, it states 46 to 54 PSI with the special tool that appears to be a pressure gauge with a tee into a sized nozzle...

 

[Deleted member 452]

I gotta ask- How did you get someone to pay you to work on their bike when you know noting about how it works?

 

[CDN Duke]

I gotta ask- How did you get someone to pay you to work on their bike when you know noting about how it works?

Brett, probably part of the process for both Taylor, the builder, and the customer...

Lots of one-off custom builds: http://www.1upgarage.com/

At least he's here researching, as we all recognize how sensitive these bikes are to AFR. Lack of airbox with only a pod should be interesting to tune for too...

 

[KTManny]

I gotta ask- How did you get someone to pay you to work on their bike when you know noting about how it works?

It's called fake it till you make it

 

[Deleted member 452]

It's cool that he's doing research but this is also why I don't trust most "tuners" that don't specialize in my vehicles. Technically, you could call me a tuner without customers...

 

[CDN Duke]

It's cool that he's doing research but this is also why I don't trust most "tuners" that don't specialize in my vehicles. Technically, you could call me a tuner without customers...

Yup, agreed 100%. And it's exactly why I chose to buy my Power Commander and the accompanying maps from Chad at Commonwealth Moto aka KTM Performance!

 

[Deleted member 452]

Chad saved my ass today! He helped me figure out that I didn't transfer the oil jets from my old clutch cover to the new one when building that new motor. My low oil pressure issue was fixed as soon as I swapped the jets to the new case so now I can ride when it stops raining : )

 

[CDN Duke]

Chad saved my ass today! He helped me figure out that I didn't transfer the oil jets from my old clutch cover to the new one when building that new motor. My low oil pressure issue was fixed as soon as I swapped the jets to the new case so now I can ride when it stops raining : )

Oh, that's good news!

 

[oneupmotogarage]

Finally got the pump assembly out of the tank today and it looks like you're right. There is nothing to indicate the regulator can vary. That's great, this makes things very simple!

 

[oneupmotogarage]

Yea I'll try to remember to post the maps when I get it dyno'd with the intake/ exhaust set up and PCV installed and tuned.

 

[oneupmotogarage]

The client owns some of our work already and knows/ trusts us. He wanted a retro custom based on an RC390 and that's what we're creating. I wouldn't say I know nothing about how it works...I am just asking some bike-specific questions to help with preliminary research.

Thanks for the question.

 

[CDN Duke]

Yea I'll try to remember to post the maps when I get it dyno'd with the intake/ exhaust set up and PCV installed and tuned.

Look forward to seeing those.

Any idea why customer chose RC390 vs Duke? Or was it simply what was available at the time? They're similar but some fundamental differences....

 

[oneupmotogarage]

Well he originally wanted an RC200 but he didn't know those aren't sold to the states so the 390 was what we settled on. Since the Duke and RC are basically the same base it didn't matter what I started with so I just went with what I found first/ closest/ cheapest. I am running a Duke's upper triple, so I can use aftermarket clip ons and use the stock bar mounts to hold the speedo bracket we'll make.