Hey guys I had a boosted b20b in my hatch im looking to just stick a stock b20 back in it and leave it all motor, am I going to be okay leaving the walbro pump in from my turbo set-up? Thanks guys

 

over 20 veiws and NO ONE knows this??

 

i think u might be running rich without a tune.

 

Yeah thats what I figured , are the stock injectors going to be okay with the 255 pump?

 

The answer to the OP's question is 'Yes'

Lets say i have a 50 lb/hr injector at 45 psi and WOT / max. load values in the fuel table are 80% duty.

50 x .8 = 40 lb/hr

So, as long as I don't change the fuel pressure or size of the injector - what difference does it make if my pump is putting out 400 lb/hr or 4000 lb/hr? The pump has nothing to do with duty cycle/tune.

 

wouldn't the fuel pressure increase in proportion of how many lph the pump puts out?

 

no, the pressure relief valve is what determines fuel pressure. you're just bypassing more.
doesn't matter if you have a weldon or a walbro, if you have an adjustable pressure relief valve, you can set fuel pressure to whatever you want.

now, if you put a monster weldon pump on it (like a 2345) with a stock pressure relief valve, the stock pr valve won't be able to bypass everything the pump puts out, and in that case you'd see a steady increase in fuel pressure the longer the car ran. But this will not be the case with a 255 + stock pr. you're fine.

 

Got it, thanks for the info!

 

people get tripped up on this quite often.

just keep pressure and volume separate.

You can have a system flow 1 lb/hr of fuel at 10,000 psi
or
You could flow 10,000 lb/hr at 1 psi

 

okay so im going to be fine with the pump , As long as i keep the dsm 450s??

 

no. if you're gonna run it stock (with walbro), with a stock ecu, put in stock injectors.

if you are running on a map tuned for 450s, then use 450s.