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Author Fuel Pressure Regulators
VrsTurbo
Premium Member

Registered: 8th Jun 10
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1st Mar 15 at 17:58   View Garage View User's Profile U2U Member Reply With Quote
As standard the Megane uses a fpr in tank so there is no return from the rail.

I am fitting a swirl pot with a 044 pump and pressure regulator. Would you put the regulator by the fuel rail or keep it near the tank?
Generation
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Registered: 7th Jul 09
Location: Essex
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1st Mar 15 at 21:35   View User's Profile U2U Member Reply With Quote
Mine was near the fuel rail
gazza808
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Registered: 30th Jun 08
Location: Peterborough
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1st Mar 15 at 22:25   View User's Profile U2U Member Reply With Quote
Depends of your putting a return on the fuel rail?
Or leaving it with no return?
VrsTurbo
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Registered: 8th Jun 10
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1st Mar 15 at 22:42   View Garage View User's Profile U2U Member Reply With Quote
quote:
Originally posted by gazza808
Depends of your putting a return on the fuel rail?
Or leaving it with no return?


The return will be from the fpr
gazza808
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Registered: 30th Jun 08
Location: Peterborough
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1st Mar 15 at 23:22   View User's Profile U2U Member Reply With Quote
Moving it to the bay will make it easier to run a vac/boost ref line to it.
so the fuel pressure rises with your boost pressure. DDon't know how the standard one did this?

[Edited on 01-03-2015 by gazza808]
VrsTurbo
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Registered: 8th Jun 10
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1st Mar 15 at 23:23   View Garage View User's Profile U2U Member Reply With Quote
It's fixed not rising rate regulator.
Generation
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Registered: 7th Jul 09
Location: Essex
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1st Mar 15 at 23:47   View User's Profile U2U Member Reply With Quote
No problem
Kyle T
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Registered: 11th Sep 04
Location: Selby, North Yorkshire
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2nd Mar 15 at 08:27   View Garage View User's Profile U2U Member Reply With Quote
Might have got my terminology wrong here, but doesn't a fixed rate FPR still raise with boost pressure - but just on a static 1:1 rate?

So if baseline fuel pressure is 40psi, it'll add 1psi for every 1psi of boost so at 20psi boost you'll have 60psi fuel pressure.

A rising rate is on a ratio of 1:1.2 for example.

Either way would still need a vac/boost tap I would have thought.

I'd also stick it as close to the rails as possible - as the more pipework you've got between it and the rails - the more scope you've got for the pressure to bleed off.

Lotus Elise 111R

Impreza WRX STi
VrsTurbo
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Registered: 8th Jun 10
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2nd Mar 15 at 08:44   View Garage View User's Profile U2U Member Reply With Quote
Nope it's just a static 3.5bar system non rising. A lot of newer cars are like it.

Just is a pain having it in the bay as I'll need to run an extra line.

How I see it if you have 3.5bar at the regulator anything after it should be 3.5bar as its a pressurised system.
VrsTurbo
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Registered: 8th Jun 10
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2nd Mar 15 at 20:24   View Garage View User's Profile U2U Member Reply With Quote
ive put it in the bay and ran an extra line under the car.
gazza808
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Registered: 30th Jun 08
Location: Peterborough
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2nd Mar 15 at 23:39   View User's Profile U2U Member Reply With Quote
3.5 bar with 2 bar boost means you effectively have 1.5 bar fuel pressure.

And it's anything before the reg is under pressure, the fpr is the restriction causing the pressure to build up.

[Edited on 02-03-2015 by gazza808]
VrsTurbo
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Registered: 8th Jun 10
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2nd Mar 15 at 23:59   View Garage View User's Profile U2U Member Reply With Quote
I only run a small turbo. So the 3.5 static is ample can run 330bhp at 3.5 static with 1.5bar boost
VrsTurbo
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Registered: 8th Jun 10
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3rd Mar 15 at 00:26   View Garage View User's Profile U2U Member Reply With Quote

 
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