Does anybody know the maximum fuel pump flow rates on these trucks. I just cannot seem to find that data anywhere.

 

There's a guy on here running a whipple w/ no fuel system mods to speak of (larger pump or boost a pump or upgraded wiring or larger lines) and he's putting down around 400rwhp or more..

I asked about his fuel pump setup and whether they datalogged fuel pump duty cycle and what the wideband read but didn't get much info.


What are you trying to do w/ the pump or your setup?

 

I have tuned the truck to run only E85 Ethanol. At the top of second gear, my datalogging shows fuel pump flow rate hits 3.99 lbs / min. The 3.99 is accurate and I think the measurement is Lbs / Min. The parameters for this setting seem to be from 0 to 8. So, this is where my question lies. My air fuel trends lean up to .86 or .88 lambda, for 3 datalog ticks (each is .6 or .7 seconds). Following the shift, I no longer have this problem. I am going to datalog fuel pump duty cycle next. I should have done this before. It seems I should know this; but, I don't.

Thanks for the help.

 

I'm not sure what datalog parameter shows fuel pump flow rate, which one is it? Its been a long long time since I've messed w/ my pro racer stuff and I have yet to datalog anything w/ my xcal2. If it were me I'd prefer to read the output of real wideband 02 versus the ticks of the factory 02 swinging.. final thought is what is stoich w/ E85? We know straight gas is 14.6 and I don't think its the same for blends is it?

 

9.85 to 1. This; however, is calc'd stoich. Normal driving I run 11.82 to 1. Much leaner; but, the burn characteristics of E85 allow this without generating too much heat or emissions. This is never my issue. I only experience a leaning issue under WOT at the top of second gear. That is why I am trying to learn what our max flow rate is. I think I will play with it and see if I can get past 3.99 flow rate. The datalog parameter is in the livelink software under the returnless fuel pump or fuel system category. I am going to look at my Pro Racer Software and see if I can adjust this.

 

Sounds like your on the right path, good luck with it and please keep us posted on your results!

 

Have you datalogged your fuel injector duty cycles? You might want to give a run at that as well.