87nitefc

As everyone knows fc tps is pos I was thinkin could it be possible to fab up a manifold that you could put a tb from a different car that has a similar tps and works better any input

87nitefc

I know it's going to alter the car performance in many ways but could this idea work maybe jus fab a adapter that could fit the oem manifold and on top the new tb

w0ppe

Sure... that would be a hell of a fab job. The TB is not just a valve and has multiple number of hoses, springs, a dash pot, etc. Could you? Of course, but what's going to tell the ECU what throttle you're at? It works via resistance and if your resistance is off (Due to different TPS), the ECU will be highly confused.
What's to stop you from getting a better or working TPS to need a custom throttle body?

clokker

iTrader: (2)

If you could find a better working, similar TPS, it'd be far easier to adapt it to the stock throttle body.
The fact that you don't see a sticky about the swap should tell you something.

KompressorLOgic

iTrader: (6)

is this a na or turbo car?

for turbo cars theres an adapter to use the fd upper and throttlebody. the fd tps doesn't seem to give people as much greif.

or you can use s5 manifolds which have a full range tps (if you had s4)

Aaron Cake

iTrader: (1)

Seems a bit like killing the patient to cure the disease.

There is no direct bolt on throttle body or manifold replacement. As mentioned, the FD manifold can be made to work but that requires a lot of other changes as it moves the fitment around. And this is only valid for turbo cars as the NA uses an entirely different manifold design.

Retrofitting another TPS is easy and commonly done. Check in the Haltech section for the Ford part number of one that fits over the throttle shaft. HOWEVER, this is a modification for standalone ECUs only where you can calibrate any TPS you want. The stock ECU expects a specific rate of change and will cause all kinds of issues (as I'm sure you well know) when the TPS isn't giving a reading it expects.

Just to nit pick, the FC TPS is hardly a POS. These cars are knocking on 30 years old. The TPS moves constantly as the vehicle is driven. It's bound to wear out at some point. Consider how often EGR valves wear out on many other vehicles. The failure mode is often the pot inside.

87nitefc

It's a turbo s4 so the best option would be to find a ford tps with a full range

87nitefc

I'm planning on installing a apexi safc gen 1 would it be best to leave as is or actually go with the swap

87nitefc

Ok so my next question would be would a apexi safc be able to control the tps

2-N-D-pink

iTrader: (27)

Ms2 are pretty cheap. Specially used ones. Then, sell the afc and get some money back. That way you can do what you want...bigger tb, wire tuck (with all new non corroded 25+ yr old mazda connectors) sounds pretty sweet to me.

rx7jocke

get a s5lower then a fd upper with fd TB if u are going with aftermarket ecu, its easy to weld/port to match!
if useing stock ecu/piggyback then stay stock intake!

87nitefc

Your telling me the s5 lower and the fd upper manifold fit on a s4 TII

87nitefc

Like what your thinkin jus confused in wat exactly it is that u mean could you elaborate for me

Aaron Cake

iTrader: (1)

Why not just find a good used TPS?

The S4 ECU really only uses the TPS for on/off idle detection and some accelerator pump input so it is more forgiving than the S5. Still, all kinds of drivability problems are created if the TPS reads out of the range the ECU is expecting. It may be difficult to figure this out with a different full range TPS as the S4 TPS basically reads 100% after about 1/4 throttle. Most other TPSs are designed to read across the entire range of throttle movement.

The S-AFC is a piggy back. It just reads the factory sensors, it does not alter them except for the AFM signal. Won't help you in this case.

I actually don't even recommend the TPS be used as an S-AFC input. I recommend using a GM MAP sensor to give the same 5V output signal but manifold pressure based instead.

2-N-D-pink

iTrader: (27)

Megasquirt v2 is a standalone and about 300 new. A stand alone is really the way to go if you plan on modifying your car IMO. You can sell the afc and get some money back on the over all cost of upgrading your car.

Our cars have old connectors and connection is really important for any ECU. With a standalone you can have brand new harness with new connectors and fresh non corroded connection. I did mine but also made my own chassi harnesd. Heres a pic of behind my dash..I have a MS3x





I didnt do this because i wanted to use a different tps. Im actually using the stock s5 t2 but i did it simply because i dont want any of the factory old mazda wire. I just run what i use and nothing more (power windows, headlights, park lights, blinkers, radio, sunroof, brake switch...etc) Then ofcourse my engine harness is new so i made it run through the firewall/tranny tunnel for a cleaner/shorter wiring. All connectors new and with the ECU ive spent about a grand

Or just getting a new TPS like Aaron
says. Because doing all this work just to change a broke TPS seems a bit much. You can find them for a good price here in the classified section and on S4's, the TPS is the same for both turbo and non turbo. I have one if you need one to drive your car.

joeylyrech

iTrader: (11)

The afc wont control the tps.......the ecu controls the tps well it reads the tps voltage and no you cant use a ford tps if you dont have a standalone.

87nitefc

So in to sum everything up there is really no alternative to the tps unless I get an aftermarket ecu where I could alter the the tps range

87nitefc

Thanks to everyone I believe that's the end to this thread until I get a standalone