More fuel pressure means more fuel flow with the same pulsewidth. The only disadvantage is you will also increase idle fuel flow, and it'd be possible to get way too rich at idle with no way to correct. In my experience that won't happen with flow force injectors, not even a 1.6 on gasoline.
You have 42.5psi base pressure at atmospheric, run it up to 72psi or 4 bar and you get free 800cc injectors. You just have to make sure your fuel pump can flow enough at that higher pressure. Remember the rail is manifold referenced, so if you are running 20psi of boost you need a pump that can flow enough volume at 92psi, otherwise your pressure will drop and your injectors will shrink where you actually need em. Edit: Maths for volume to horsepower... Numbers.. .91BSFC for e85, 350hp for 80%dc at crank= ~318lbs/hr 318lbs/hr / 6.59lbs/gal = ~49gal/hr 72psi + 10-14 pounds of boost = ~90psi at WOT You'd need a pump that does ~45 gal/hr@92psi to run 72psi, the warb is really the only single pump solution I know of at the moment. |
Walbro450 is beast. Check my build thread, I'm about to drop one in next week probably. I'm controlling it with PWM so I don't have to run it at full tilt all the time.
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Originally Posted by aidandj
(Post 1338793)
Walbro450 is beast. Check my build thread, I'm about to drop one in next week probably. I'm controlling it with PWM so I don't have to run it at full tilt all the time.
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Not really, the fuel just circles around over and over again. The walbro runs more amps with more restriction from the FPR from increased rail pressure. At 43.5psi it's around 180W, up to 240W at 90 psi. Since the FPR is manifold referenced actual current draw will vary.
For a comparison a walbro 190 would be turning around 70W at 43 psi. |
If you get a proper fpr, its fine.
Stock fpr is on borrowed time with a 450. plenty of people here have splooged their stock fpr with even a wally 255hp. even if it doesn't get overwhelmed I'd imagine it would be unstable pretty often trying to bleed off all that fuel. just a thought |
Originally Posted by 18psi
(Post 1338908)
If you get a proper fpr, its fine.
Stock fpr is on borrowed time with a 450. plenty of people here have splooged their stock fpr with even a wally 255hp. even if it doesn't get overwhelmed I'd imagine it would be unstable pretty often trying to bleed off all that fuel. just a thought |
Yeah lot's of newer OEM's use that now too
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FYI, this is the only accurate map for E85 stations around me: Alternative Fuels Data Center: Ethanol Fueling Station Locations
Maybe it's accurate for you as well. Every other one I've tried is either outdated, or just plain wrong. |
Originally Posted by acedeuce802
(Post 1338918)
FYI, this is the only accurate map for E85 stations around me: Alternative Fuels Data Center: Ethanol Fueling Station Locations
Maybe it's accurate for you as well. Every other one I've tried is either outdated, or just plain wrong. |
Originally Posted by 18psi
(Post 1338915)
Yeah lot's of newer OEM's use that now too
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