Fuel pressure with E85

Discussion in 'E85 Technical Forum' started by philosobrad, May 5, 2009.

  1. philosobrad New Member

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    Necessary to raise FP when changing to E85?
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  3. GNVYUS 1 A.K.A. DR.BOOSTER

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    Not unless you're going to cheap out and try to run an inadequate injector. If so and you're making decent power, you better have a huge pump that flows a ton of volume at your WOT pressure and not running it through the stock feedline.
  4. philosobrad New Member

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    Upgraded to 60's only for now, Walbro 340........but keeping the boost down. Curious about the wideband numbers though......it's idling at 14:1, is this ok?

    No knock on the Powerlogger thus far at 20psi.
  5. Rafs-T-Type Not so Senior Member

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    well i really have no idea as to the correct answer, but if E-85 requires 30% more gas with the same amount of air (so the story goes)..wouldn't it make sense to have to raise the fuel pressure then to get to the correct ratio of air to fuel :confused:
  6. novaderrik Active Member

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    not if you run a bigger injector and have a fuel pump that can put out more volume for a given pressure.
  7. GNVYUS 1 A.K.A. DR.BOOSTER

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    Stock injector is 28lbs, 28% larger is a 36lber, run them both to 70psi at WOT and which one will supply more fuel into the cylinder on the same fuel pump?

    So, get the correct injector and matched fuel pump for your POWER and you're in business. Relieving any bottlenecks will help push those components like bigger lines ( -10an etc ), bigger rail ID etc.

    Idling at 14:1 is fine, many like closer to 15:1 and even leaner while cruising but you're not hurting anything other than gas mileage at 14:1.

    Tune for power at high 10's and get ready to make some madd torque.
  8. philosobrad New Member

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    You're a gentleman and a scholar.........thanks!
  9. Hot Air E85 Moderator

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    Way to go guys! Great advice!! You are catching on.
    Hot Air
  10. GSmooth New Member

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    great info


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