Some NEWB E85 Questions

Discussion in 'Mazdaspeed 3/6 E85/CornFed' started by rang-a-stang, Mar 9, 2021.

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  1. Sho

    Sho Greenie Member

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    Sounds like you're relief valve is failing. Hpfp active pressure should remain 1600+ under load.
     
    Sho, via a mobile device, Mar 8, 2022
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  2. Awafrican

    Awafrican Moderator Silver Member

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    Glad you're enjoying the ethanol also the "Cobb" set of hpfp internals = autotech. Options really are autotech or corksport with them being similar enough. I know Raider had his autotechs fail and swapped to CS.
    Definitely worth testing your PRV

     
    Awafrican, via a mobile device, Mar 8, 2022
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  3. rang-a-stang

    rang-a-stang Greenie Member

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    I replaced my PRV less than 10k miles ago with a new Mazda factory part. Just ran out and ran the test again. it went to 1835 before it popped off but it took F O R E V E R to get there. Like 20 mins. When I ran the test last time, I thought I remembered it taking less than 5 mins.

    I understand why we run this test and why it is valid, but I do not understand how it works. I don't understand how pressure climbs without the cam turning and pumping the HPFP. Is it purely the fuel heating up in the rail?
     
  4. Enki

    Enki Motorhead Platinum Member

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    Yes. That's why having a hot engine is important for the test.
     
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