Guys is it ok to unplug this and leave it unplugged if your running a power FC, and you've done the 12v relay mod to the fuel pump? Or do the wires still need to be grounded/bypassed etc

 

Denso TT pump FTW!

 

You need to install all a jumper on the harness connector.

 

Thanks banzai, ps the upgraded starter I bought from you guys is awesome!

 

Just curious, what is this for? I am in middle of single conversion with walbro pump, will resister have to be removed?

 

From what I understand it was added by Mazda to try save fuel to make the rotary a little more economical. So at idle the the resistor relay will limit the voltage sent to the pump on idle for example so it doesn't flow at max (which would be 12v) to save on fuel. As engine load increases so would the voltage to the pump supplying fuel faster.

When we mod for power this isn't our friend as lower voltage to the pump under harsh loads (if anything went wrong) could lean out the system.

My query was if running a power FC and the pump off its own 12v source would this resistor relay be able to be left unplugged as technically it shouldn't work if not running factory Ecu. I might unplug it and see what happens. If it runs crappy I'll jump it like banzai boys said.

 

couple of minor corrections.

Mazda has this system set up so that under 1psi of boost, the fuel pump is running on ~9v. since fuel demand is low, this has no effect on fuel economy, as fuel pressure stays the same. what it does do, is make the fuel pump quieter, they say it lasts longer, but more importantly is that you're not heating up the fuel by pumping it around the car at full stream all the time.

secondly the default for this system in the FD is 12V to the pump, the relay has to switch ON to go through the resistor.

if you do a little searching a lot of the high HP guys are actually putting this back on their cars...

 

.....and I stand corrected! Hehe, so what would be the benefit of bypassing it as so many do if high hp guys are reconnecting?