4g15+T Fuel Pump Upgrade?

donki

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When increasing injector size from stock to 275cc in a 4g15, is a higher flowing fuel pump necessary?

What does the stock fuel pump flow at?

What would be a suggested upgrade in terms of pump flow rate?
 
it will all depend on the flow rate of the stock. The fuel pump is normally higher in flow rate then the injectors so not to starve them.
 
275 cubic centimeter/minute = 16.5 liter/hour
what are you upgrading injectors to
 
hmm, unless my measurements are wrong :S

Stock injectors are definitely below 170cc
& definitely upgrading to 275cc injectors.

Not sure on the stock pump flow thoug
 
basing it of averages, when evos run 1050cc of 255l/ph pumps, 80 should be fine for 275. As long as the pressure is good
 
mdclear said:
basing it of averages, when evos run 1050cc of 255l/ph pumps, 80 should be fine for 275. As long as the pressure is good

That leads me to another question:

How do i find out the pressure, and will(should) it be enough?
 
I think this thread so far has confused injector flow and pump flow.

Keep in mind there are 4 injectors, and the pump has to deliver the flow plus more at a higher pressure. Look for an evo updated oem style pump. I have a Walbro 255(iThink) in my vr4, John has the same in his coupe
 
I upgraded my injectors to gsr. Still running stock pump with turbros. Am i crazy lol neh, its fine man, im not runnin crazy power.
 
unclepaulie said:
Keep in mind there are 4 injectors, and the pump has to deliver the flow plus more at a higher pressure. Look for an evo updated oem style pump. I have a Walbro 255(iThink) in my vr4, John has the same in his coupe

Any idea if an Evo pump is bolt up for the lancer/mirage setup? Im mainly after plenty of pressure in the fuel rail, to keep the injectors full or so they dont try to suck in nothing.

Joshy_morris said:
I upgraded my injectors to gsr. Still running stock pump with turbros. Am i crazy lol neh, its fine man, im not runnin crazy power.

Do you know if you're having fuel starvation issues or anything?

Or any idea if the 4g93 pump is a little higher flowing then the 4g15
 
Im using the stock fuel pump with the 94 swap if that means anything? I would say your safe with a basic 1.5 turbo swap tho. But you will want a wideband to see if your leaning out at any point while tuning. and they will tell you if its the pump/injectors or just the tune. I guess if your worried you could find a gsr/early evo pump?
 
th0m0mx83 said:
Im using the stock fuel pump with the 94 swap if that means anything? I would say your safe with a basic 1.5 turbo swap tho. But you will want a wideband to see if your leaning out at any point while tuning. and they will tell you if its the pump/injectors or just the tune. I guess if your worried you could find a gsr/early evo pump?

Definitely getting a wideband, its next on the cards once i get the ECU (the wideband will feed data into the ecu, for datalogging and a whole bunch of other stuff). I think im a little more confident with the g15 pump, but i think i'll still be looking if an upgrade pops up cheap enough.

Edit: Thanks all for the help and info!
 
I just bought an evo 4-6 walbro from meek, when i had a dyno run, it wasnt starving at all on the stock pump, i was only running 130kw approx though, stock tune, you'll have to tune the 1.5 turbo ecu though so probs need to upgrade the pump
 
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