Contour Enthusiasts Group Archives Forums Modifications General Mods TPS Adjustment mod... has anyone done this?

I am wondering if anyone has tried re-adjusting the Throttle Position Sensor (TPS) voltage. Mustangs take very well to this and so do other cars in the way of better throttle response and a slightly different Air Fuel (A/F) mixture under Wide Open Throttle (WOT).

I am trying to do any free mods to the Contour and wondering if any of my classic Mustang tricks will work here. Has anyone tried this before, if so, then where do I set it to?

I won't believe that until I see proof.

I'm not trying to start an argument here... just asked a simple question. It has been proven to do so on late model Mustangs and other cars, so I figured it was worth a shot on the Contour, so I'm just asking the question. Is there anyone out there that has tried this mod before?

Please explain to me how altering the TPS voltage would effect WOT settings?

Since the PCM uses a specific throttle percentage to read WOT and runs off a preset table; what difference would a few more hundreths (even a tenth or 2) of a volt mean to anything. Once it reaches said voltage level the PCM thinks it's at WOT and acts accordingly. It does not care if it's 92% 93% 94% (etc) they all equal WOT.

Now above a certain percentage it cares because the high & low voltage ranges are used by the PCM to see if the TPS is bad.

I also would like to see this proof since I have 2 magazines that have tried this mod on both a Mustang & Camaro and show no change at WOT. The only change they showed was an slight increase in fuel flow (rich spike in A/F ratio) for a split second at throttle tip in.

What it does is make the "driving" or partial throttle range (and voltages within that range) much closer to the idle position which increases the responsiveness of the throttle for low/mid range RPM's. It also brings the WOT setting down a little bit so if you aren't matting it, you get more bang for your buck with the throttle you are giving it. I am not saying that if you press the throttle 3/4, your fuel tables go into WOT mode, I'm just saying that it make's the car a little more responsive.

Again, I am not trying to argue here, I just wanted to bring something into perspective that I have not seen on this forum yet. I wasn't the one who thought up the idea 10 years ago or the one who does dyno tests because does it add HP, probably not, but it makes the car feel a little more responsive.

As far as 1-2 tenths in voltage, that can mean a whole world of difference in a great deal of sensors. It is possible that the sensor would go out of range if you went too far, that's why I asked. As far as changing the A/F ratio... there is a range in which WOT registers. Depending on the minor voltage differences within that range, it acts differently, it varies the tables slightly, so if you alter the position of the TPS, you are altering the voltage that the computer reads under full throttle conditions.

Like I said, it was a question, I didn't want to start a war or get knocked down. I just simply said, "has anyone done this?" That?s all I said. I didn't engineer the computer or sensors on the car, but I have a very good understanding of how automobiles work, both mechanically and electronically. With that said, I can't tell you any more than that as far as what it does or what happens, because that is the extent of my knowledge on it, I have done it on MANY mustangs and other cars, and it is noticeably peppier as long as you know where to go with it or you have yourself a good digital voltage meter and stay within reason and keep testing and re-trying it over and over. I am new to Contours as I just bought mine, but I am in no way new to automotive performance. I did searches like everyone says to do and I didn't come up with anything, so I thought I would ask if anyone had tried it.

WA2FAST is right. On 5.0's, setting the TPS output voltage to as close to 1.0V as possible does signifigantly improve throttle response. I never thought of trying it on my duratech, but I don't see why it wouldn't have the same effect.

I understand the logic behind it.

Your are making the PCM dump a little extra fuel at throttle tip in (like a carburetors accelerator pump) to help with part throttle throttle response. Thus effectively richening up your part throttle settings.

My advise is just use more throttle when you want more acceleration.

Again this will not effect WOT settings at all.

BTW - OBD-II will trim out this mod as it has it's hands all over part throttle settings.

Never thought about the OBD-II aspect. Good point.

I had this done earlier this morning at the Car Care Center. The mechanic over there use to work on Fords and also he worked on race cars as well. He did increase the voltage on the tps sensor. And I did feel the difference from the start. Good throttle response.

Thanx MCJ777. Do you have any idea what voltage he set it at? Can you find out if not?