FPR Base pressure

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Ryan S
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FPR Base pressure

Post by Ryan S »

So, car is just about ready to fire up, had an issue with a knackered fitting resulting in not getting to start her up yesterday, very frustrating after waiting 4 years to hear it ha!!

Anyway, What should i be setting the fuel pressure at? It's currently on stock fuel pump and stock turbo (i won't be running any boost until it's run in) but 800cc injectors.
androo007
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Re: FPR Base pressure

Post by androo007 »

42psi buddy. Can up it if you need to squeeze more out the injectors later (bodge)
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Ryan S
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Re: FPR Base pressure

Post by Ryan S »

androo007 wrote:42psi buddy. Can up it if you need to squeeze more out the injectors later (bodge)


Ah great man cheers. Na 800s should be fine for my goal :)
C35Rob
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Re: FPR Base pressure

Post by C35Rob »

3 bar/43.5 psi is the correct base fuel pressure with the vacuum line NOT connected to the regulator.
EX MR2 owner, currently on a '00 Honda CBR600 Follow me on Instagram @c35rob
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Ryan S
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Re: FPR Base pressure

Post by Ryan S »

I do have the vac line connected Rob, Should I disconnect it?
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Re: FPR Base pressure

Post by C35Rob »

Ryan S wrote:I do have the vac line connected Rob, Should I disconnect it?


Yes, while you set the base pressure, then reconnect it. The whole point being at atmospheric pressure your fuel pressure is 43.5psi/3 bar, and for every psi of positive manifold pressure your fuel pressure increases by the same amount to keep the differential pressure between the fuel in the rail and the air in the manifold the same.
EX MR2 owner, currently on a '00 Honda CBR600 Follow me on Instagram @c35rob
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Ryan S
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Re: FPR Base pressure

Post by Ryan S »

Ah sorry I misunderstood, cool man thanks for that! I'll report back as soon as this fitting arrives!
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