Quick questions regarding fuel pumps

[FSAE_Newbie2011]

Hello, =) I'm working on a dead head fuel system for a 2005 R6 engine. At the moment, I'm thinking of using Walbro GSC 404 (the one that goes with PFA) with build in 330 kpa pressure reg. I don't know if that will work. Has anyone had any experience using that pump for an R6? I've talked with an engine tunning specialist. He recommended a factory VE fuel pump with pressure reg. Because I'm a noob, I didn't know what he was talking about. What is a factory VE fuel pump? What does VE stand for? Is it a type of configuration? I tried google and couldn't find any useful info. Thanks a lot.

[FSAE_Newbie2011]

Hello, =) I'm working on a dead head fuel system for a 2005 R6 engine. At the moment, I'm thinking of using Walbro GSC 404 (the one that goes with PFA) with build in 330 kpa pressure reg. I don't know if that will work. Has anyone had any experience using that pump for an R6? I've talked with an engine tunning specialist. He recommended a factory VE fuel pump with pressure reg. Because I'm a noob, I didn't know what he was talking about. What is a factory VE fuel pump? What does VE stand for? Is it a type of configuration? I tried google and couldn't find any useful info. Thanks a lot.

[Kirby]

are you from australia?

[FSAE_Newbie2011]

Yeppers, and we are on the same team. I'm Joe, the guy that's working on this year's fuel system. I didn't get a lot of info on the system used in the previous year so I'm not quite sure.

[carbon_black]

He'd be referring to Holden's current Commodore generation - http://en.wikipedia.org/wiki/Holden_VE_Commodore


Whether or not it'll be a suitable pump for what you want - no idea.

[wweissin]

Look at a BMW S1000 RR fuel pump. It appeared to be a standard fuel pump. The control is the important part though. The BMW did not have a fuel pressure regulator and we could not add one because of the rules. So what we instead is run a high speed relay and changed the duty cycle on a PWM output to achieve our desired fuel pressure.

[Kirby]

<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by wweissin:
Look at a BMW S1000 RR fuel pump. It appeared to be a standard fuel pump. The control is the important part though. The BMW did not have a fuel pressure regulator and we could not add one because of the rules. So what we instead is run a high speed relay and changed the duty cycle on a PWM output to achieve our desired fuel pressure. </div></BLOCKQUOTE>

How did you go regulating this pressure over the full RPM range (e.g. variable and non-linear properties of flow vs. pressure)

[wweissin]

I guess I should start off by saying it was done with a SQ6 ECU which has PWM tables that can have the X and Y axis user defined. Those where then set like an Alpha-N map with boundaries that mimicked the base fuel and IGN tables. We then mapped the duty cycle not only for RPM but load as well, since that would affect injector open time, to get close to our desired fuel pressure. After that we setup our closed loop parameters and the rest is history as they say.
The reason the load axis was fairly important for us is because the bike runs staged injection so we had to keep fuel pressure stable when the secondary injectors turned on and off.