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E85 On Rb25 With Deatschwerks Pump?

midnight

By midnight,
in Engines & Forced Induction

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Legionnaire Collaborator

Legionnaire

Posted
Posted

Google around, these deatschwerk pumps have shown some pretty good results on EVOs running E85.

MA-dyno.jpg

Found this, precision 6262, 4x1500cc injectors, 624 American whp.

At 33 psi, hey. It's like what, 75-80psi at the pump?

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Depends on the base pressure. I run over 30psi with twin Walbro's on eflex with bosch 1000's. I dropped my base pressure to 35psi so it now only runs around 65psi at the top end. Keep your pressures as low as possible imo.

The only issue I have with the higher flowing fuel pumps (deatschwerks etc) is the current draw seems to go up exponentially with flow, to double the current the Walbro needs. Make sure you run good power cable with a high current relay install.

Legionnaire Collaborator

Legionnaire

Posted
Posted

Current draw should be kept in check, that's for sure. However I wouldn't say it grows exponentially, it does go up with more fuel pressure and voltage supply, but in more like a linear manner. Power cables, relay and alternator capability should be all considered.

Scotty nm35, I think there is something to be said for both high and low fuel pressures. High pressures can make injectors with lower nominal cc/min flow useful, generally give better spray pattern and fuel atomization, resulting in lower fuel consumption and better ltr/bhp ratios, but make injector coils work harder, increasing their latency and making them heat up faster in powered up state, make pump work harder, increasing its power requirements and noise and heating up fuel. On the other hand, lower fuel pressures can really make use of larger injectors working at relatively high duty cycles, super-high-pressure-and-high-volume expensive fuel pump is not necessary, but you have to be really clever about injector spray direction and shape in order to keep fuel consumption reasonable and avoid bore washing.

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