malpassi fuel reg good or not?

[rev210]

a bad tradesman always blames his tools. The design of the malpassi has nothing wrong with it. The Application is always the reason it doesn't work the way it is supposed to.

I'm sure the people who have owned and correctly used the malpassi can guide you to a solution where this brand of regulator works perfectly, should you find another one lying around.

There are of course larger capacity regs in other brands if you need something that will flow a larger volume of fuel.

[dangerous_daveo]

Okay, let's up the ante... Why put one on at all?

Reading through the previous threads, the debate is still inconclusive as to whether the stock unit is just as good. It sounds like it is capable up to a point, but where is that point?

I have been given a fuel reg (I was told it's a Malpassi but it has no markings) and I really don't want to put it on because of all the problems being experienced by others. The car is my daily driver and reliablity for me is a bigger issue than having a fuel reg that may not be any better than the stock item.

Why fix it if it ain't broke?

Can we put this one to bed?

It aint broke, but it makes it better, so your not fixing your improving. I put one on and noticed the difference. Turned down the pressure a bit more, noticed it being even better, and fuel economy went up (from where it was previously set). I think they are a worth while investment/ way to waste more money on the car, as cars are a waste of money

[ylwgtr2]

a bad tradesman always blames his tools. The design of the malpassi has nothing wrong with it. The Application is always the reason it doesn't work the way it is supposed to.

I'm sure the people who have owned and correctly used the malpassi can guide you to a solution where this brand of regulator works perfectly, should you find another one lying around.

There are of course larger capacity regs in other brands if you need something that will flow a larger volume of fuel.

A friend of mine who was responsible for preparing the vehicle that took steven richards to his formula ford championship in the 90's in his team valvoline car swears everytime someone mentions malpassi.....they had numorous fail from new.......he also had one fail on an F3 car after 2 laps costing them the championship....after changing to bosch they never had a problem.....i have also had them fail myself......i guess either we are bad tradesmen,the quality control in malpassi is terrible or the product just plain old stinks

[T0nyGTSt]

I've had heaps of different shops say bad things about Malpassi. One or two shops I can understand... but in reality... who cares?

Regulators are a coupla hundred at best.

Spend a little more on a good one.

I'm using a Nismo/Apex unit and it looks like it's a OEM JECS/Unisia part. It cost less than a Malpassi.

T.

[knore]

What good is a different regulator if the engine is already getting all the fuel it needs? Considering most boosted engines run rich, how is this gaining any power?

Obviously it allows fine tuning of fuel pressure though...

[4door_Sleeper]

Krone - most of the rb engines run rich when they are off of boost, but if you start to increase the boost they can get too lean, which is dangerous at that end of the rev range and when under load.

The other reason for using an aftermarket regulator is that the std injectors are at there limit at a little over 200rwkw, so the regulator allows you to push it a little further without the expence of new injectors ($800 - 1000 for RB25). If you wanted bigger rwkw >250 you should be considering injecrors, but if you are only pushing 220 then the regulator is cheap insurance for your motor.

So you are right in that it wont give you any more power, but it will give you more scope to tune the engine and a little bit of insurance against a blown motor.

[awurth]

had one on my skyline and I know of another couple using them and a Turbo FTO. All is fine with the malpassi reg's.

[knore]

Krone - most of the rb engines run rich when they are off of boost, but if you start to increase the boost they can get too lean, which is dangerous at that end of the rev range and when under load.

The other reason for using an aftermarket regulator is that the std injectors are at there limit at a little over 200rwkw, so the regulator allows you to push it a little further without the expence of new injectors ($800 - 1000 for RB25). If you wanted bigger rwkw >250 you should be considering injecrors, but if you are only pushing 220 then the regulator is cheap insurance for your motor.

So you are right in that it wont give you any more power, but it will give you more scope to tune the engine and a little bit of insurance against a blown motor.

Well ive always looked at it like a bandaid to a real problem anyway..

If you have a big fuel pump and bigger injectors than theres no need for a regulator

[Guilt-Toy]

For sale - Malpassi Fuel reg Silver one with bracket for RB engines $150

[dangerous_daveo]

Well ive always looked at it like a bandaid to a real problem anyway..  

If you have a big fuel pump and bigger injectors than theres no need for a regulator

Mates car the injectors are too big, so yes the fpr is a bandaid, however in that case its to up the pressure so the injectors dont dribble. On lower pressures it wont idle properly.

He also has one on a lancer, as why get aftermarket injectors when all he needs is a bit more fuel pressure to handle some happy gas.

[Gonad Man]

As mentioned there's no need for an aftermarket fuel reg unless you're running out of duty cycle with the existing injectors. Upping the fuel pressure a bit can make the difference for a marginal setup but always best to go bigger injectors and retune. A fuel reg will make no difference if the fuel pump isn't up to the task.

Another reason an aftermarket fuel reg is handy is use a twin-outlet regulator to split the fuel supply into a pairs of 3 cylinder supply lines. Sometimes the last injector in the series can get an inadequate supply of fuel.

Getting back to topic Malpassi regs are probably best to avoid if you're pushing fairly critical A/F ratios for max power. They vary pressure a bit depending on temp or whatever, I just know a few people that suffered from inconsistent fuel pressure and A/F ratios and the problem was solved with a Sard or SX fuel reg.

...Ben