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Old 28-07-2003, 02:54 PM   #11
globalautomotive
Junior Member
 
Join Date: Jul 2003
Location: Melbourne
Posts: 14
FSE FPR

Hi guys,

Seen as i have been getting a few hits from this site i thought I would pop past and see what all the fuss is about.. Your chatting about my FSE products. That’s great, i like you guys already.

My name is Adam and can help you with any questions you may have regarding the FSE FPR's if you so require. You guys seem to know what you’re on about though. Here's some information that you some of you may have been confused about.

FSE is an Italian brand that manufacturer's Malpassi Fuel Pressure Regulators (FPR). There are a few types available. The one most useful to us modifiers is the High Rate of Rise Regulator (HRR). Basically this means it has a higher air:fuel ratio than that of the standard 1:1. A HRR unit rates at 1:1.7 meaning for every 1lb of manifold air pressure you will receive 1.7lb of fuel pressure. When you press the accelerator the slowest thing to respond is the Fuel Pressure Reg. With a HRR regulator the speed of response is 1.7 faster than factory. This explains the expedited throttle response off the line and between gears.

The HRR unit is also good because it is Rising Rate. Contrary to popular belief, the majority of efi FPR's are in fact rising rate. However they seem to reach max fuel pressure at about 3500 revs and fail to hold any more, leaving the injectors on their own to increase duty cycles in an effort to supply fuel. The FSE HRR increases pressure as required by the engine is allot higher, essentially allowing the injectors to retain duty cycle lengths although supply more fuel.

With rising rate regs of this nature we all understand that fuel pressure in a system is constantly changing to match the air flow through the manifold. They use vacuum/boos to determine the amount of air flow at any one time and will determine the fuel pressure to match this air flow. A correctly adjusted fuel pressure reg will not waist excessive amounts of fuel unless the car is thrashed. Why i say this is because fuel delivery with this mod is like no other in that it will only give you the fuel when you ask for power, however will remain at stock levels when cruising. No other fuel based mod can offer this.

Rising rate Regs are like a safe guard for your engine. By richening up on increases in air flow you can be sure that your engine's combustion chamber is not running dry. A lean mixture especially with a forced induction engine will not take long to crack a compression ring. A friend who just bought a S15 with a badly tuned aftermarket piggy back computer has just discovered that his cylinder 1 is down to 90psi instead of 140psi just because of lack of fuel. What a headache..

As mentioned this unit is adjustable. All adjustments to the FPR's are made at idle. Your factory fuel pressure may be approx 28psi and depending on you air based mods you may end up finding max power at 35psi. Very marginal difference in fuel pressure but that would be the difference between running lean or stoichiometrically rich (rich side of correct mixtures). The easiest and most accurate way of describing the theory behind the use of these regs is as follows. When you modify your engines intake and exhaust, essentially what you have done is increased the air flow volume. The air flow pattern remains the same. Therefore the fuel delivery pattern should remain the same, just increased. Adjusting the fuel pressure up does exactly that.

Fuel pressure adjustment is only meant to be marginal. Quite honestly you should only waist fuel when you thrash your car, otherwise fuel pressure pretty much sits at factory. The reason your closed loop system doesn't make drastic changes to the fuel curve is because of 2 reasons. 1. the fuel curve can only be trimmed up or down marginally to lean out or richen the supply. and 2. these adjustments are only sensed at idle not during the rev range. Seen as fuel supply is essentially the same at idle, no change or very little change is made to the curve.

Finding the correct pressure without a dyno is still pretty accurate and easy (although try to get it on a dyno if possible). 15 minutes of test driving will be enough time for you to increase the fuel pressure up in stages until you find which level has given you the highest power improvement. Increasing the level too high is of no benefit as an over rich mixture will result in loss of power.

As someone mentioned earlier, you will not need fuel unless you have air.
If you don't need fuel then you won't get power. You will find yourself probably be trying to turn the pressure up too high wondering were the power is and consequently waisting fuel. Your response when asked about the product would be... 'ah it gave me no power and it waists lots of fuel.' Not the sort of thing we really benefit from hearing. What makes it worse for us is when that person goes and puts on a air-filter/exhaust and can't believe the power he has gained. :roll:

When supplied to a car that has had no other fuel chips or aftermarket computers currently installed on it we can guarantee your power increase. We can do this because the product operates to specifically provide the amount of fuel required by your engine (twice as fast), therefore providing the maximum power obtainable from a fuel based mod.

The FSE Power Boost Valve (PBV) is a FPR kit. It is made by FSE Malpassi, and offers us all a bolt on solution. The problem with modern efi systems is that the factory regulators position is now usually found bolted to the end of the fuel rail instead of between 2 hoses. So FSE has gone to the trouble of designing little fittings that bolt to the fuel rail to replace these regulators. In the kits you also receive all hoses/fixing items/the FPR complete with a gauge and also instructions so you can do the job yourself. Rebirthing the product in this way has really paved the way for huge sales of Malpassi Fuel Pressure regs.

FSE also offer a range of Motor sport fuel systems, such as H.Vol fuel pumps internal and external and the recent release of the Bullet Cleanable High Flow Fuel Filter.

Hope this helps..

And the winner of the longest message reply goes to.... :arrow:
__________________
Adam Dalton
Globalautomotive.com.au
FSE - Fuel Systems Enterprises.
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