Mazda Rotary Club

I\'m getting ready to change my secondry injectors to 1600\'s and was wondering about some of the options available

I\'ve read a bit about parallel set ups were each rail has a seperate feed from a \'y\' splitter and separate returns to the FPR . What are the advantages of this set up over a normal set up and at what point would this be needed ?

The FPR I have is an FSE one , is this a 1:1 type or a 1:1.5 rising type ? If this is a 1:1 type when would the rising type be needed ??

What is the general consensus on resistors in the injector circuit ? I always thought they were needed because you\'d fry the injector driver in the ECU but I have just read in a seperate post that Clive says they are not needed , I\'m guessing Pip thinks they are needed as I bought my bits off him and he included them

Lastly fuel pumps , opinions on new parallel wiring to the fuel pump . Pip has assured me that the Walbro pump is a good pump when fitted properly and will meet myt fueling needs ( I dont have the pump yet so I could get a bosch one )

That\'ll do for now

Cheers

Paul:wave

Quote from: TintinI\'m getting ready to change my secondry injectors to 1600\'s and was wondering about some of the options available
 
I\'ve read a bit about parallel set ups were each rail has a seperate feed from a \'y\' splitter and separate returns to the FPR . What are the advantages of this set up over a normal set up and at what point would this be needed ?

Advantages of this kind of setup are that the pulsations from the secondary injector circuits will not interfere with the primary injectors - as each fuel circuit is regulated on the return. You still have to ensure that your fuel pump (s) can deliver the fuel required - you can either have one pump splitting to a Y and feeding each set of injectors, or 2 pumps from the tank - one for each circuit and regulate to a common return.
 

Quote from: TintinThe FPR I have is an FSE one , is this a 1:1 type or a 1:1.5 rising type ? If this is a 1:1 type when would the rising type be needed ??

Not too sure on this - rising rate generally used to compensate for the increased boost / additional air - more fuel pressure - more fuel - but the ECU should also be able to map this
 

Quote from: TintinWhat is the general consensus on resistors in the injector circuit ? I always thought they were needed because you\'d fry the injector driver in the ECU but I have just read in a seperate post that Clive says they are not needed , I\'m guessing Pip thinks they are needed as I bought my bits off him and he included them

Resistors are generaly required when the injectors are the low impedance type - 2-3 Ohms (the high resistance types are 12 ohms or more), however, some aftermarket ECU\'s don\'t need the resistors and will work with hi or lo impedance type. I would go with what Pip says to be honest - he knows his stuff.
 

Quote from: TintinLastly fuel pumps , opinions on new parallel wiring to the fuel pump . Pip has assured me that the Walbro pump is a good pump when fitted properly and will meet myt fueling needs ( I dont have the pump yet so I could get a bosch one )

The stock wiring to the fuel pumps is not very good - the cable is quite thin and the voltage drop introduced can be significant - about 1-2 volts - which means the pump isn\'t working at optimum. The Walboro\' pump is pretty good for stock fuel pressures - but will struggle to provide fuel for very large injectors - if you are sticking to 550 primaries and 1600 secondaries then it should just about cope - but the pump struggles at higher fuel pressures, and if you are going with bigger primaries get a beefier pump - you can\'t pump too much - that\'s what the FPR and return lines are for !!:)

Walboro nasty noisy pump imo much better options out there.

I run two seperate fuel lines, one Bosch 044 pump per line both running  off a swirl pot, apexi BNR 33 lift pump feeding the swirl pot, one fuel line per rail, return pipes going into a single Aeromotive FPR then back into a single fuel return back to the tank.

No resistors on secondary injectors on my setup

Mine is a nice simple system. Walbro 255ltr in tank fuel pump feeding primary and secondary rails.
Its up to you what you go for but this set-up made me achieve 470 fwhp.

Here\'s some pics I lifted from another forum.

Fish

Cheers fellas , I\'ll do some more thinking about it all

I\'d replace the FSE with an Aeromotive as they\'re far better. They stick sometimes which is not what you want :)