quick fuel pump question

[Thomas91169]

i hear about people rewiring the stock fuel pump so they can upp the boost a little bit more and still be on the safe side. what about aftermarket pumps though? i am installing a 190walbro tomorrow and was just wondering if a rewire would make a difference or if i would need it. mods will be evo16g@20psi, 550cc injectors, 190 pump, safc2 and pocketlogger.

 

[truwarrior]

I'm running 190fp with a evo16g...so far no problems but I havn't opened it up all the way yet to get any good logs...but ya...so far no knock counts boosting around 16-17 psi until it creeps and I have to cut the throttle.

 

[BOOSTn20psi]

i hear about people rewiring the stock fuel pump so they can upp the boost a little bit more and still be on the safe side. what about aftermarket pumps though? i am installing a 190walbro tomorrow and was just wondering if a rewire would make a difference or if i would need it. mods will be evo16g@20psi, 550cc injectors, 190 pump, safc2 and pocketlogger.

Yes, you will still need to rewire the pump if you want more boost. I installed a 255 it run abit better than stock, but after rewire I went from stoich to super rich even at idle. With out rewire I was still hiting fuel cut at17psi.
But from the a/f/r reeding, I can tell that the pump is actually working too well.
Got 550cc and FPR and SAFC2 car runs great now.

 

[Thomas91169]

umm im hoping youre basing those stoich/rich readings from something other than the a/f gauge, unless its wideband.

 

[XtremeGST]

if you rewire the stock fuel pump u wont need a new fuel pump for that turbo. your just gonna waste some money.

 

[PaleDSM]

With out rewire I was still hiting fuel cut at17psi.

Fuel cut has nothing to do with what fuel pump you are running or if it is rewired or not. It is based on airflow only.

 

[PaleDSM]

Original poster: Most likely at that level you will not exceed the flow limit of the unwired 190lph pump. The only way to really be sure is to watch a fuel pressure gauge as you run the car at full boost watching to see if the fuel pressure continues to rise at a steady 1:1 ratio. The fuel pressure reg. will keep that ratio as long as the pump can supply fuel.

For as easy as it is I would just rewire it while you are doing the install.

 

[BluemeanieTSi]

if you rewire the stock fuel pump u wont need a new fuel pump for that turbo. your just gonna waste some money.

you're kidding right

 

[BluemeanieTSi]

Original poster: Most likely at that level you will not exceed the flow limit of the unwired 190lph pump. The only way to really be sure is to watch a fuel pressure gauge as you run the car at full boost watching to see if the fuel pressure continues to rise at a steady 1:1 ratio. The fuel pressure reg. will keep that ratio as long as the pump can supply fuel.

For as easy as it is I would just rewire it while you are doing the install.

some 190 pumps (3kgt ones) won't operate correctly unless rewired