injectors running 100% duty??

[yamaha227]

Finaly had the chance to take my GTR down the qauter last night, managed a best of 12.3 thought it was ok for my first outing and no mods done for the strip. Think i have finaly reached the end of my gear boxes life though... wouldnt select third at all 3 out of my 5 runs and now i have no 5th and reverse gear

but one thing i did notice is after each run, having a look at the peak hold status on th PFC hand controller my injectors were running at 100% duty cycle at some stage down the qauter.

I have 700cc sard injectors and a walbro in tank fuel pump, so any ideas on what it could be? Fuel rail or fuel regulator problem? it still has the stock fuel pressure reg on it so not sure if it can keep the pressure i need for the big injectors?

Now all i need is to try and find a new box...

[600hp]

could be the pfc but i would check the fuel pressure first. then get the injectors checked for flow rate.

[Amaru]

The injector lag times and duty cycle havnt been setup in the power fc correctly.

[yamaha227]

injectors have just been cleaned and are all good, PFC was set up by Ben at race pace so im guessing it should be right.

Will check the fuel pressure as soon as i get a chance, maybe it was suffering from a bit of surge with the G's at the strip?

[Amaru]

injectors have just been cleaned and are all good, PFC was set up by Ben at race pace so im guessing it should be right.

Ahh ok, it sounded like the typical problem where people wack in the injectors and expect them to work straight out of the box

[RPMGTR]

I think you'll find the injectors are actually 550's....

cheers

B.

[BHDave]

How much power? Walbro may be struggling at anything over 250atw

[Sydneykid]

Hi Yamaha227, assuming that Race Pace checked the fuel rail pressure at the time of tuning, then fuel pump, fuel lines, fuel pressure regulator etc are all irelevant. The only thing that makes an injector run at 100% is the ECU and that means the tuner programmed it that way. So either the tuning is excessively rich or the injectors do not flow enough. Without a rwkw number it is a bit hard to comment further.

[GTR-Ben]

And if your doing a 12.3 @ ?mph, and need 700cc injectors.. you are either driving really bad (missing 3rd wouldn't help) or not making anywhere near the power to run your injectors at 100%

[yamaha227]

Had a chat to ben yesterday and as it turns out they are 550's, silly me jumping to conclusions... or that was the impression the previous owner gave me anyway. so with 320kw@rw im guessing that's nearly about it for those injectors

Oh well, another thing that i can put on the list for future upgrading, sorry to lead you all down the garden path... and GTR-ben i promise i will try harder next time, my driving must really suck

[GTR-Ben]

A Fuel Pressure Reg would probably help you, a bit more pressure to the injectors.

Your fuel pump may not be able to keep up though.

Don't worry about the driving, was just joking with you