fuel pump for 450bhp
#11
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Fuel regulator won't help. Oversizing the pump, would cause over-fuelling at wide open throttle (open loop uses the map). Idling/part throttle uses the closed loop/oxygen sensor compensation.
Rough pump size calculation: MAX HP x 0.65 (petrol turbo) divide by 1.585 = ?lph
Rough pump size calculation: MAX HP x 0.65 (petrol turbo) divide by 1.585 = ?lph
#12
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I have been running a Bosch 044 from 280bhp right up 400bhp as I have upgraded various components all while using the factory pressure regulator with no I'll effects.
Not disagreeing as I don't know myself, genuine question.
cheers.
#13
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my wrx standard pump leaned out at around 430, think the pump was rated 190lph also may have been on 20%meth at the time but memory not good now.
granted fpr no good if pump can't supply the fuel.
Trev
Last edited by trevsjwood; 10 October 2018 at 02:11 PM.
#15
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How does oversizing a pump cause over fuelling? Would the fuel pressure regulator not keep the fuel at the desired pressure?
I have been running a Bosch 044 from 280bhp right up 400bhp as I have upgraded various components all while using the factory pressure regulator with no I'll effects.
Not disagreeing as I don't know myself, genuine question.
cheers.
I have been running a Bosch 044 from 280bhp right up 400bhp as I have upgraded various components all while using the factory pressure regulator with no I'll effects.
Not disagreeing as I don't know myself, genuine question.
cheers.
#16
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Current draw is minimal really, plus it's not at wide open throttle that much realistically and I have it running through the standard Subaru fuel pump controller but thanks for the explanation, still trying to understand open and closed loop fuelling lol.
#18
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I have an external bosch 044 which is part of a swirl pot system I have connected up for track only, the intank pump acting as a lift pump to swirl pot. With swirlpot/bosch 044 connected up the fuel pressure rises by about 0.3bar over when just using the normal system, that's at tickover. I adjust it back to the required pressure but the over supply must be causing the pressure to rise in the first place?
Trev
Trev
Last edited by trevsjwood; 10 October 2018 at 09:42 PM.
#19
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Hmm, I have a walbro 255 (genuine, from lateral), and also a genuine 044 pump on the shelf .. I was going to swap them before mapping (and run the 044 in tank), but are we now saying a 255 will support up to 450bhp?
im only aiming for 400, so for hassle factor, I'd like to stay with the current setup, as mapping is a week and a bit away.
im only aiming for 400, so for hassle factor, I'd like to stay with the current setup, as mapping is a week and a bit away.
#21
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the pump most would have at that level is bang in between the two you have lol.
It's got to be a personal choice but if the 255 was in good shape I personally would keep your present set-up, rather than running the big Bosch all the time.
If at a later date you decided up the power with meth for instance re consider then.
Trev
It's got to be a personal choice but if the 255 was in good shape I personally would keep your present set-up, rather than running the big Bosch all the time.
If at a later date you decided up the power with meth for instance re consider then.
Trev
#22
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Primary pump is fine / any higher or indeed taking the car on track then a lift pump with a swirl system would be advised or you could hunt for a spec c anti surge pump assembly
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