power boost valve

[mdm123]

currently my civic (b16a2) is fitted with a power boost valve. but it's due to get a nice wee t3 turbo introduced to it.

so heres my question, am i right in thinking that a power boost valve isn't the same as a rising rate fuel pressure regulator.

say with 10 psi of boost it won't increase the fuel pressure by 10 psi etc.

[stevieturbo]

I think it rises at a rate higher than 1:1

Never actually monitored pressure from one, although have used them many times on turbocharged cars

[marfgtti]

If its an FSE get rid of if, you only need to search FSE on scoobynet and GTR.co.uk to pick up some horror stories.

Most aftermarket regulators are 1:1, i.e. 1psi increase in intake pressure gives 1psi increase in fuel pressure, however some are 1:1.7, i.e. 1psi increase in intake pressure gives 1.7psi increase in fuel pressure.

[GreenV8S]

mdm123 said:

am i right in thinking that a power boost valve isn't the same as a rising rate fuel pressure regulator.

say with 10 psi of boost it won't increase the fuel pressure by 10 psi etc.

The ones I've seen are exactly that - the fuel pressure rises by more than the manifold pressure so it goes richer as you open the throttle. Not a very scientific approach to engine tuning, might be beneficial if your engine is leaning out under power, but otherwise just likely to make it run too rich.

[mdm123]

i think it is a FSE one, i remember looking into them a while ago, and they were rubbish then, it came fitted to the car so i just left it on.

when i do fit the turbo on, i'll be tuning it with a full mappable ecu and a wideband, but yea i just wonder were they the same as the likes of a sard rising rate fuel pressure regulator like i had on my starlet gt turbo. just wasn't sure if they were the same as or what a FMU FUEL MANAGEMENT UNIT is.

[MarfGTti]

Yeah go the Sard, quality item compared to the FSE and not expensive.

The Vortech FMU is a 1:1.7 rising rate regulator.

Good to hear you'll be doing things properly with an ECU and wideband

[stevieturbo]

And if you have an ecu to control fueling, the FSE will work fine.

But as some say, it is not as good a quality item as other brands, but to date, Ive used 20-30 of them, and never had a problem myself.

The Vortech FMU's can be had in many different ratios.