Fuel management
Hey ppl i just registered to this site.
I have questions about fueling underboost. But first let me share my vission. So i got myself a gt28 garrett disco potato. Putting in forged pistons and rods lowering compression to about 8.5:1 and also putting in titanium valve springs because i plan to raise rpm limit to about 9000rpms. Now having said that i can say im planning on running 25psi of boost before i get falmed from everyone thinking im running that much boost on stock internals loll... i will be running megasquirt and putting in 850cc bosch injectors and ill have a 300lph fuel pump supplying fuel load. Now my question is how do i figure out how much rail pressure ill need and if ill need to upgrade my rail or regulator. In conclussion what do i need fuel pressure wise to support 25psi of boost. Im also willing to run meth injection to take care of any potential pingage. Need expert help please and thank you!!!! |
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rc injectors calculator should tell you pressure @ rail based on Target crank horse power https://www.rceng.com/technical.aspx
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A GT2860 should be able to spin to 25psi fine, probably won't make much power at higher boost levels then that though.
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Originally Posted by Forrest95M
(Post 1314508)
rc injectors calculator should tell you pressure @ rail based on Target crank horse power https://www.rceng.com/technical.aspx
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Play with the numbers and you should get your answer
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Originally Posted by Forrest95M
(Post 1314684)
Play with the numbers and you should get your answer
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Originally Posted by Mohanad A Reda
(Post 1314695)
Ok heres another question. Based on the calculations its telling me i need 850cc injectors at 43.5psi at rail to support 400hp. So does injector flow rate compensate for pressure at rail then?
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Originally Posted by Forrest95M
(Post 1314720)
your stock fuel pump should be able to flow enough up to 300whp with at least a replacement unit. I'm not 100% sure but I think its flowing enough to maintain the 43.5 psi @ the rail. Also yes using bigger injectors means you wont have to run any sort of bandaid to rail the rail pressure
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I'm on a stock fuel rail @ 75psi base pressure with an adjustable fpr. The rail will definitely take more than 43psi if you need to raise the pressure.
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Originally Posted by pdexta
(Post 1314769)
I'm on a stock fuel rail @ 75psi base pressure with an adjustable fpr. The rail will definitely take more than 43psi if you need to raise the pressure.
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Originally Posted by Mohanad A Reda
(Post 1314795)
can the stock regulator work within higher fuel pressures as well?
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Originally Posted by Girz0r
(Post 1314796)
It tends to get overwhelmed with the higher pressure, but a FPR like the one I linked to earlier solves the issue.
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Originally Posted by Mohanad A Reda
(Post 1314795)
Sweet good to know pdexta. How much boost are you running? And can the stock regulator work within higher fuel pressures as well?
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