Fuel Regulator? SAFC? Piggy Back? Stand Alone?

[DJ-EVO3]

I just wonder how fuel regulator works...

if anyone knows please share ur knowledge...

but the thing is my mechanic said I don need it.. but frankly speaking..

only for this part.. they didn really explain why and I just felt like..

they didn see the condition for need of fuel regulator..

the reason why I feel like to have one...

back fire (miss fire) unburnt fuel sometimes..

engine feels bit heavy...

and sounds good.. so it makes me to have one.. :P

 

[bigboystoys]

a fuel regulator keeps your fuel pressure checked

your fuel pump would pumping a higher pressure that what your engine really needs, a fuel regulator is there to keep the pressure checked at the correct pressure. too high fuel pressure may result in a rich mixture which may lead to unstable firing.. loss of power...


:)

 

[DJ-EVO3]

oh... so fuel regulator is only to check how it goes???

not doing anything but check?

 

[bigboystoys]

it is not 'not doing anything'
the primary function of the regulator is to keep pressure constant
a fuel pump may vary in its 'output' pressure, by how much i won't know
but at least you have your regulator to keep it always at the correct pressure

example, for a sportsbike, they have internal fuel pump assembly, the regulator keeps the fuel pressure constant. it 'relieves' the excessive pressure by venting the fuel back to the fuel tank

:)

 

[alvin24]

Assuming the car's stock standard... then its not that necessary. The car's already fine tuned for its stock conditions. OEM cars also ALREADY has its own fuel regulator... just that its not adjustable. Adjustable fuel regulators allow u to adjust them to your desired (or more like required) fuel pressure rates... compliments the SAFC... thats why its advisable to get adjustable fuel regulator first if u're going to get an SAFC.

If u're driving an n/a... u might feel a slightly better response in your car. Turbo i think it does too little to be noticed.

 

[GSR5559]

jus a noob question here/..

is this Fuel Regulator is the alternative ways of SAFC..as in can tune it to the desired level of fuel ? i mean the adjustable fuel regulator le..
cus SAFC is so costly and i guess fuel regulator is the cheapest way..am i rite? :)

 

[WRX STI]

Originally posted by GSR5559@Dec 19 2004, 12:00
jus a noob question here/..

is this Fuel Regulator is the alternative ways of SAFC..as in can tune it to the desired level of fuel ? i mean the adjustable fuel regulator le..
cus SAFC is so costly and i guess fuel regulator is the cheapest way..am i rite? :)

;) nope..u still need a afc or something to monitor the fuel pressure after u installed a fuel reg...

 

[KeonG]

so it means that the Fuel Regulator work best for the N/A engine nor the Turboz? ;)

 

[flamefox850]

what have alvin24 told is true..stock injection car has OEM fuel regulator..but it is not adjustable.

the main propose of fuel regulator is to keep ur injector under fuel pressure. this fuel regulator sits between fuel rail (that attach to the injectors) and fuel return line. it will ensure only certain amount of fuel from fuel rail being pass to fuel return pipe and to tank..this by mean it will limit the fuel to return but will force the fuel to be inject by the injectors..more pressure being forced, more fuel being squirted by injectors
BUT,remember, this pressure will not built up if fuel pump is too weak

 

[ngwei2402]

how much for this thing?

 

[Speed Demon]

There are quite a few brands available with the most famous in Malaysia being the FSE. There are also cheap fuel regulators selling in N1 Racing and Amoil for around RM120, I think. Don't get those as they do not really hold the pressure constant beyond a certain psi. I think a mid-range(price-wise) fuel regulator is available from Aerospeed.

 

[DJ-EVO3]

So now.. anyone can clarify

the differences between those things...

inclusive with Good & Bad points, Price..etc.,


1. Fuel Regulator

2. SAFC1 and 2 (Separately... what are they? what's the differences..)

3. Piggy back (eg.SMT6-7, Perfect Power)

4. Stand Alone (eg. Haltec, Micro..)


All those things are somehow related to ECU and Fueling stuff..

and a lot of people saying different things and makes me

complicated...


Yo Dudes... I know where those web sites are thatI can find some

Info.. but I want Feed back from the users or any of ur

close friends having any experiences by using this...

Let's share ur precious knowledge with me..

 

[Speed Demon]

As mentioned above, a fuel regulator regulates the fuel pressure in your fuel rail. It cannot control how much fuel to flow.

I don't know much about the difference between SAFC1 and 2 but what the SAFC allows you to do is control how much fuel to flow at different RPM levels.

The SMT series come into the same category as that of the SAFC, which is they are piggy-back ECUs. The main difference is that the SMT allows you to control more than fuel levels and also at which rpm. For example using the SAFC I can set fuel levels at every 500rpm whereas SMT allows me to do it every 200rpm.

Piggy-back ECUs do not replace your ECU (hence, why they're called piggy-back).

Stand-alone ECUs totally replace your stock ECU. And thus they also give you a very wide range of what they're able to control and tune.

You can visit How Stuff Works for a good intro to car engines and the various components.

Hope this helps.

 

[flamefox850]

speed demon has explain a lot but i want to clarify...what safc does and fuel regulator for our engine.

ok...fuel regulator as said earlier is to keep the injector with fuel pressure. ok imagine ur house tap..if u dunot open it..then no water comes out right ? but the pressure is there right ? becos the pressure of water being supply by our water supplier. once u open the tap...water comes out flowing fast. if the pressure is high...u open a little only u will get a full cup of water in seconds. Opening the tap so much will flow MORE water and u will get a cup of water less than second.
BUT if the pressure is low, even u fully open ur tap, the water flows slowly and u only manage to get a full cup of water in a minute

so, did u see the different between the open an close of injectors and the pressure of fuel being regulate by FUEL REGULATOR ?

ok now...SAFC is a device to alter the signal from maf/map sensor to ECU. if u set the SAFC to +ve side...then u r cheating ECU that so much air/boost coming, and so ECU order the injector to inject more fuel. HOW ? yeah, by opening the injector longer. (injector work by on/off or bukak/tutup with certain duration..set by ECU). the longer the injector open...the more fuel can be inject into the combustion chamber.
BUT if the fuel pressure is low.....how can a fuel be inject so much ? even if the injector work on 100% duty cycle or always open, the fuel entering combustion chamber sooo little becos fuel pressure is too low.

so, when tuning, u need both. the fuel pressure and the 'longer/shorter duration of injector opening' device such as safc or other ems (haltech, motec etc)