Learn me on Fuel pump duty cycle

[CanuckSnake]

Hey, just figuring out how to Data-log for the first time. Trying to figure out why its falling on its face around 5000rpm under full throttle. What should my fuel pump duty cycles be, whats normal at idle ,under throttle and whats bad. Its all new to me so go slow. What else should I data-log?
Thanks

 

[Tractionless1]

40's normal at idle and for pump longevity I wouldn't go North of 95%.

 

[CanuckSnake]

Thanks, is the % how hard the pumps are working, 0 off, 100% max?

 

[GodStang]

Thanks, is the % how hard the pumps are working, 0 off, 100% max?

Let me google that for you

 

[Tractionless1]

Thanks, is the % how hard the pumps are working, 0 off, 100% max?

Precisely Captain.

 

[TVSCobra]

Like some have already said you need to keep your FPDC under 85-90% at WOT full load conditions. Most have no idea their duty cycle is too high until they develop a problem, or if system voltage begins to fall to low.

 

[ra03svtcobra]

How can you calculate the duty cycle %? I look at my datalog and I don't see a column for duty cycle, so you must have to figure it out?

 

[TVSCobra]

How are you logging? Handheld or using Livelink? If you are using your handheld, what tuner device do you have? Your programmer may not be configured for FPDC.

 

[ra03svtcobra]

How are you logging? Handheld or using Livelink? If you are using your handheld, what tuner device do you have? Your programmer may not be configured for FPDC.

I'm using the xcal 2 plugged into the laptop running live link I believe (an sct program just not sure of the name). I use the configuration that the tuner (VMP Tuning) sends me and it captures everything he wants to monitor.

 

[CanuckSnake]

I have the same set up and I'm almost positive that there is an option to view duty cycle.

 

[bubblehead93]

RTLS FPUMP DTYC outputs as a decimal between 0 and 1, multiply by 100 and that is your duty cycle in percent.

 

[04sleeper]

RTLS FPUMP DTYC outputs as a decimal between 0 and 1, multiply by 100 and that is your duty cycle in percent.

This.

 

[ra03svtcobra]

Found it. Mine hits 88.9999 at approx 6500 rpm's. Looks like I am at my limit.

 

[2003cobraguy]

im at 97% at WOT lol

 

[VincodeY]

88.9 at redline is gravy.

 

[ra03svtcobra]

88.9 at redline is gravy.

So does that mean I have room for improvement? That can be a good thing.

 

[spitin venom]

Mine were maxxed at 100% and now I have a bap and it is hitting right around 76% at redline. At idle i am right around 36%. If you are at 90% u should be okay but it is a little to close for comfort for me. Make sure you change your fuel filter pretty regularly.

 

[ra03svtcobra]

Funny you should mention that, I changed my fule filter and installed the MAFia and did a log. Now my max is 84.68%. Not sure if that is because of the filter change or maybe the tune revision. We'll see.

 

[theunseenclass]

Even with a BAP my FPDC was 100% from 4000-6500. i guess im starving for fuel even though my A/F are fine. pump out?

 

[racin4ds]

My car is hitting what seems like a rev limit or fuel cut right around 5000rpm as well, I just got my Diablo Predator and logged my FPDC and it seems to max at 50.000% so I'm guessing my fuel pumps are fine, what else can I do? If my fuel filter was clogged, wouldn't my FPDC be way up? Plugs are fresh TR6's gapped at .034. Tried it with the stock tune and the diablo tune and it still does it??