as the title states...i am looking to switch from a dual to a single fuel pump setup...do i need to retune my haltech if i switch?

 

if the pressure remains the same, no you shouldn't have to.

ideally, yes you should to be sure that the volume under that pressure is remaining constant.

 

j-rat is running ~500HP with a single walbro, i am 100HP less than that so 2 pumps is definitely overkill...the supra pump outflows a walbro IIRC...i also have an aeromotive FPR...i guess the whole volume vs pressure thing has me second guessing myself.

 

well, you have 2 pumps that produce X amount of volume at Y PSI, now you have a single pump doing twice the work. it's hard to explain but i would still suggest having the tune checked out, not like it should need much adjustment if any at all but you are modifying the starting point of what keeps a turbo engine together, that is fuel supply.

 

there is no way i'm even closing to maxing out the walbros...so if the single can flow as much as the two are currently flowing (the same LPH @ the same pressure) it should be the same? or am i missing something?

 

don't think about it in the simplest of terms. you have 2 people blowing into 2 straws which merge into 1, now you have 1 person blowing through just the one straw. effectively there will be some differences between the 2 somewhere somehow, if you want to trust that it will be 100% equal then you can be the judge, i just am offering my opinion, which is usually on the safe side of the fence.

perhaps there is someone who has run 2 pumps and went back to a single but chances are pretty high that they also did a retune afterwards before assuming it was ok.

alternative is to leave the 2 pumps in, do a run with a wideband and note your results. now switch to the single pump and ramp up your runs from 3rd gear pulls to 5k on up to redline then the same in 4th while monitoring your AFRs to be sure they are the same.

i will be blunt, only an idiot will come here and say "yes, it is 100% safe". because if anything does happen, they get the **** storm. just like fools who share maps for standalones and think they are safe with the same setup, there is always variables.

 

understood, thanks a lot

 

np, added some after also if it helps your decision.

 

If your using AI. WOuldnt that take some work out of your MAIN fuel system? Injector duty cycle goes down? ANd so would your pump duty?

Possibly meaning that J-rat makes 500+ out of one pump all thanks to his AI?

What if you 'r to make 500+ out of fuel in you gas tank alone. 2pumps for sure?