I'm having trouble figuring out how to wire up mine to the factory harness. It would be extremely easy if Mazda elaborated the function of the four wires. I know the Green/Red and Black/Green wires are the narrow and full signal inputs. From looking at the diagrams it looks that the Brown/Black wire is the ground for the sensor. That only leaves the Brown/White wire to be the 5v input. I've hooked all of this up to only read 4.99 on both VAT1 and VAT2.

The q45 TB is read out be.

Red - 5V input
White - TPS signal
Black - Sensor return

It's been a really long day for me so hopefully it's something simple that I've overlooked. If anyone can figure this out I would be extremely great full.

 

I've done it, on an sr20 lol.

 

How does that help him?

 

Mazda does the FD TPS a bit differently - there are 4 wires to the TPS. 5v, ground, narrow signal, wide signal. The narrow signal outputs 0-5v to the ECU, but is full range at only 25% or so of throttle travel. The wide range goes the full way.

I know the FC only used a narrow range TPS, then added the wide range only for the electric oil metering pump. I don't think it's that case with the FD, since you need a wide range TPS input with a MAP sensor. But, that's what the ECU is wanting.

Dale

 

By bumping his thread cause I was curious also, thanks for the concern.

 

what exactly is the problem? you have 3 of the 4 connections that match up one-to-one. just use a transistor on the narrow range with the right gain so you hit saturation at 1.25v (25%)

 

bump

 

what upper intake are you useing to mate the Q45 up

 

I don't see the point of a Q45 TB on most applications. The stock TB is not a major restriction, and its progressively opening, 3 barreled design was to maximize intake velocity to the individual ports. I've seen over 500whp dyno sheets on the FC3S TB which is the same basic design as the FD but smaller bores.

 

I was successful!!! I'm using a custom upper intake manifold that I made. It was A LOT of work to get it all done right. The inboard velocity stacks (flush not protruding) are the best feature.

As for the q45 throttle body, most people wont need it. I'm using a 42r so I WILL be taking advantage of it. The factory throttle body flows pretty well but people have ported it and tapered the transitions to allow for nice increases. This shows it's not the best but plenty of people have the stock tb on 650whp+.

I honestly think anyone with a turbo flowing more than 85lbs per minute should be stepping up the throttle body size. I'll see if I can get some good pictures off my other laptop and post...

 

^ You definitely DO need it then.

 

Sorry to drag this old thread up but what was the answer?
Also my throttle body doesn't have the tps what year q45 tps will I need? or can you just modify it to take the FD tps?