Ok, so I bought a Supra Turbo pump from the Toyota dealership, and this is what someone had to say about the Supra pump:

"the nippon denso supra pump has a different amp draw which would make it the wrong choice of pump since the the fuel pump resistor was originally designed
to work with a different pump although the mazda pump is the same company. the difference is the internal electrical components of the pump, BUT you can use it as long as you run off battery voltage with of coarse an ign. signal & 12 volt relay with right amp rating"

He says I need a 12V relay? Sorry, this ones a bit over my head - electrics is not one of my better know-hows, hehe. I know that once a car is running, voltage fluctuates around 13.7v, right? How do I supply 12v to the pump? Damn, and I thought this was plug and play. =P

TIA!

 

Doesnt the stock pump run off 12volts? Just drop it in, I have been using it for years with no problems.

Jason

 

The stock system has an electronic two-speed setup. At idle and low RPM, a resistor runs in series with the pump, effectively lowering the voltage that the pump sees. In high-speed or high-load operation, a relay bypasses the resistor, giving full voltage to the fuel pump.

It makes sense that a pump with a higher amp draw could burn out the resistor, but I haven't heard of that happening to anyone. My BNR-32 pump draws a lot of power my resistor has not burned out.

The verdict: Don't worry about it, it will work fine.

-Max

 

I seem to have gotten confused through the posts.

Maxcooper: your saying that we have that kind of system? 6v to 12v transition? The same as the Supra or were you describing the Supra's? I know that all my friends with Supra's did the 12v upgrade as one of their 1st. If that's the same as we have then it's easy and should be done for sure.

 

Max was describing the RX7 system. It is 12V and lower voltage. You would have to figure the voltage based on the internal resistance of the pump and the inline resistor. The problem MIGHT BE that the rx7's inline resistor sees too much power .. current times voltage. I'll run the numbers here in a little while. I'm putting my pump in today anyway.

 

I've noticed something along these lines to be true. Ever since I installed the Supra pump in my car, I seem to get a very high pitched whistle emitting from the fuel lines under the car, whenever I start the car and it's been sitting overnight, and the temps are very cold(aprox. 20deg out). It only does it for about the first minute, and then suddenly disappears. After that it will never happen again in the same day. The morning after, after sitting (and probably cooling down) it will happen again, for the same 1 minute. Not sure why it does it, but it sounds like it could have to do with that two step resistor that you guys are talking about. I've had the pump in my car for about 3-4months now, and other than that, it works perfectly. Checked the pressure and it was over 95psi straight from the pump.