Newbie confused???? 5sfte, Numbers and how everthing relates! Options

[urbandork]

Ok im slowly doing a 5sfte. However when it comes to the fuel delivery system i get conused.

Things that im confused about
FMU's
Boost Contorller
Boost timing managment.
225 lph pump
330cc injectors

Ok how do they all relate and work together? What would happen with out them? which ones can i do with out asap and which ones can i put on later?

So far Im confused on the whole fmu thing. What are the ratio numbers representing and how does this relate to me? i suspect they are fuel compression numbers or something? How does it change the fuel flow?? if it even does that? How does a 2 bar map sensor get into this equation.

Boost contorller? what does it do i assume it has something with controlling boost but how and in what way? Fuel ??? Does it jsut mess around with the a/f mixture isnt this what a fmu does? Is it the same as an FMU? im so lost?

Whats all this talk about how much load is on the injectors and the % numbers? what r these number?

BTM retards boost right? can i jsut redo the timing myself? Or does it only retard it when there is boost? Can i run 8 psi with out retarding my timming?

225 lph pump. This just pumps more fuel into the chamber right?

330cc injectors. These allow for more fuel to be sparyed into the chambers right?

I have searched both this forum and google and i seem only to get more confused. I dont like putting something in my car i dont understand or explain how it works. Thus y im asking and want to understand how these things work.

Thanks a million in advanced cus omg im so confused.

This post has been edited by urbandork: Mar 11, 2005 - 10:34 PM

[presure2]

sorry i was away all weekend pretty much..the guys pretty much have it covered, ill add my 2 cents, too..lol

ok, a FMU is used to raise your fuel pressure according to boost. the ratio #'s work like this. for instance say you have a 12:1 fmu. what that means is that for every 1 pound of boost, it will raise your fuel pressure 12lbs. so say you start with a base fuel pressure of 42lbs. and your running 10lbs of boost. the FMU unit would raise your fuel pressure by 120lbs. that would give you a total fuel pressure of 162. (just so you know, you dont ever wanna have that high a fuel pressure, thats just an example)
with the combo of the larger injectors and BTM and SAFC or whatever to control fuel, you dont need the FMU. IMO the FMU is somthing that i would use if i was doing it old school and just adding a injector in the intake path.
a boost controler is exactly what it says, it controls boost. you use the boostcontroler to control the amount of boost you want to run.
the BTM(boost timing management) unit is a product thats made by MSD. its made to retard your timing a set about for every pound of boost.
when you introduce a turbo onto the 5sfe, you have a few inherit problems that you have to overcome.
you need to add more fuel to compensate for the extra air your forcing in to the motor, so the first thought is to pop in bigger injectors, BUT when you put in the bigger injectors, you need t have a way to take out some of that extra fuel you dont need when your not boosting, and to add more in the places you need it.
thats where units like the SAFC come in. what that does is intercepts the map sensor signal going into the ECU and "tricks" the ecu into thinking there is less or more air coming into the engine than there actually is, so the ECU adjusts the amount of fuel acordingly. now, when the ecu does this, it controls the timing at the same time, advancing and retarding the timing according to how much fuel&air are going into the engine.
as your RPM's increase, the ECU natrally adds timing, and when you add boost to the mix, you get closer and closer to detonation. that is bad. lol thats where the BTM comes in, you use that to take out some timing to help keep u in that "safe "range.
the fuel pump is just that it pumps fuel from your tank to the fuel rail. the bigger pump pumps more fuel. simple. and no its NOT safe to run without it.
the injectors, theyre 315's NOT 330's are to add more fuel like i said to compensate for the extra air your cramming into the engine with the turbo.
all the above things work together...you really need to use them in unison, as a big "combo" so to speak...if you have AIM hit me up, man, we can chat about it.

This post has been edited by presure2: Mar 13, 2005 - 12:48 PM