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SVTPerformance's Chain of Restaurants
The Distillery
Bosch 105s on e85. Can they make 1000+?
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<blockquote data-quote="JeremyH" data-source="post: 14593376" data-attributes="member: 160292"><p>Indeed if your system can handle the higher pressure it will push the injectors farther. Its just not always ideal depending on your pump setup since pump flow starts dropping a lot north of 60-70psi when you throw boost in the mix. Most fuel pumps only flow their advertised rating at 39-42psi. So the higher your static or base pressure is and the more boost you run the lower the flow and power potential for the pumps. For your setup that Weldon pump (250gph/947lph at 40psi) putts out a lot of flow at higher pressure still (around 200gph) even at 80psi (758lph). But the average in tank pump sees a drop of 35-40% flow at 80psi. A gss 255lph pump for example that flows around 260lph at 39psi, only flows around 150lph at 80psi.</p><p></p><p>Looking at that weldon pumps numbers and the pressure your seeing at max boost, it is indeed capable of 1000rwhp on e85 with 105 injectors. But not much more maybe 1050-1100. Its defiantly not a linear curve up top, flow starts dropping a lot faster as you push pressure higher and higher. There comes a point where you have to lower boost, step up injector size and bring base pressure back down so the pump can flow the fuel it needs to support the power.</p><p></p><p></p><p>For reference a twin walbro dcss 465 setup is around 850lph of flow and is rated to 1000rwhp on corn with a 40psi base pressure and 30lbs of boost or less.</p><p></p><p></p><p>On my setup I was able to coax more power out of my setup and fuel system by keeping base pressure low and lowering boost some while adding timing with e85. Lowering boost allow the injectors to go further while not hurting flow of the pumps. I'm a fan of keeping base pressure at what the pumps and injectors are rated for. Each setup will be different and there's more than one way to skin a cat.</p></blockquote><p></p>
[QUOTE="JeremyH, post: 14593376, member: 160292"] Indeed if your system can handle the higher pressure it will push the injectors farther. Its just not always ideal depending on your pump setup since pump flow starts dropping a lot north of 60-70psi when you throw boost in the mix. Most fuel pumps only flow their advertised rating at 39-42psi. So the higher your static or base pressure is and the more boost you run the lower the flow and power potential for the pumps. For your setup that Weldon pump (250gph/947lph at 40psi) putts out a lot of flow at higher pressure still (around 200gph) even at 80psi (758lph). But the average in tank pump sees a drop of 35-40% flow at 80psi. A gss 255lph pump for example that flows around 260lph at 39psi, only flows around 150lph at 80psi. Looking at that weldon pumps numbers and the pressure your seeing at max boost, it is indeed capable of 1000rwhp on e85 with 105 injectors. But not much more maybe 1050-1100. Its defiantly not a linear curve up top, flow starts dropping a lot faster as you push pressure higher and higher. There comes a point where you have to lower boost, step up injector size and bring base pressure back down so the pump can flow the fuel it needs to support the power. For reference a twin walbro dcss 465 setup is around 850lph of flow and is rated to 1000rwhp on corn with a 40psi base pressure and 30lbs of boost or less. On my setup I was able to coax more power out of my setup and fuel system by keeping base pressure low and lowering boost some while adding timing with e85. Lowering boost allow the injectors to go further while not hurting flow of the pumps. I'm a fan of keeping base pressure at what the pumps and injectors are rated for. Each setup will be different and there's more than one way to skin a cat. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Distillery
Bosch 105s on e85. Can they make 1000+?
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