about TPS voltage..

TheRedBlur · Jun 28, 2006

I know how to set it when the tb is in the car. But my car is out of commission and my throttle body is sitting in the next room. I was wondering if there is any way of setting it when it is off the car?

urban96 · Jun 28, 2006

the 94/95 tb dosent need to be set

it takes a base reading when the car is turned on and works from that

bill302 · Jun 28, 2006

urban96 said:
the 94/95 tb dosent need to be set

it takes a base reading when the car is turned on and works from that

he's talking about setting the throttle position sensor(tps) without the throttle body(tb) being installed in the car... the tps does need to be set but i don't know a way to do it unless the tps is installed on the throttle body and the tps plugged into harness on vehicle...i think urban96 misunderstood the question....

BlackVert · Jun 28, 2006

nope, urban96 is right. when you turn on the car, the computer reads the voltage and takes that as the closed value

bill302 · Jun 28, 2006

BlackVert said:
nope, urban96 is right. when you turn on the car, the computer reads the voltage and takes that as the closed value

o.k are you saying when installed the tps is automatically set at .98-.99 volts if not can you explain i'm a little confused...or does the computer read where the volts are at and calls that voltage closed and/or is it not recommended to set tps at .98-.99 volts and i thought this is what urban96 was talking about...setting the tps at .98-.99 volts without throttle body being in the car.

HISSIN50 · Jun 28, 2006

This is always a nice source of debate. The 94-95 computers baseline the TPS reading upon start-up (so long as it's within tolerance - if not a limit code is generated). This IS TRUE ON MAF FOXES too, though no one ever believes it (per Probst).

Some guys think the car performs a little better when the TPS is dialed-in right on the edge of the closed throttle voltage limit. It's free to do, so I say go for it. It is necessary to do? Shouldnt be.

TheRedBlur · Jun 28, 2006

BlackVert said:
nope, urban96 is right. when you turn on the car, the computer reads the voltage and takes that as the closed value

that's crazy, but wouldn't the sensor peg at WOT if the voltage was a bit high when closed?

TheRedBlur · Jun 28, 2006

oh yah, I should add that I've done H/C/I and installed an aftermarket throttle body.

HISSIN50 · Jun 28, 2006

TheRedBlur said:
that's crazy, but wouldn't the sensor peg at WOT if the voltage was a bit high when closed?

It would require pressing less far into the gas pedal to achieve WOT TPS values.
Not sure on SN's, but they used to sell a harness for foxes that basically required less pedal depression to achieve WOT (on a fox, this happens at about 2.7 volts above the baseline setting).

BlackVert · Jun 28, 2006

TheRedBlur said:
that's crazy, but wouldn't the sensor peg at WOT if the voltage was a bit high when closed?

ok then. think what you want.

here's an example. let's say the tps reads .81 at startup. that is .19 below 1.0, the "reference" value. in its main loop, when the eec reads the tps, it takes the value it gets (e.g. 1.34) and it adds .19 to it, to get 1.53. that is the value it uses.

if the initial value is, say 1.17, then the eec would subtract .17 from whatever it reads and use that.

doesn't seem too crazy to me.

TheRedBlur · Jun 29, 2006

right, although I am drunk as hell, I see your point. however, my engine runs waay to rich at idle, rich to the point of stall. which means it wouldn't go under, it would read WOT at 3/4 instead of 4/4.. can you dig? I do understant that the 94-95 computer is adaptive, but if the sensors are out of range, yet still funciton, th ecomputer will have a hell of a time. Can I set my TPS (regeardless if it needs to be done or not), can I do it wthout the connector disconnectged? w/o wire probes?

BlackVert · Jun 29, 2006

TheRedBlur said:
right, although I am drunk as hell, I see your point. however, my engine runs waay to rich at idle, rich to the point of stall. which means it wouldn't go under, it would read WOT at 3/4 instead of 4/4.. can you dig? I do understant that the 94-95 computer is adaptive, but if the sensors are out of range, yet still funciton, th ecomputer will have a hell of a time. Can I set my TPS (regeardless if it needs to be done or not), can I do it wthout the connector disconnectged? w/o wire probes?

i don't know how you would do that, sorry.

but you would probably also have to elongate the bolt holes because they are not designed to support adjusting the tps

your rich condition is most likely the tune. did you get a chip burned or are you doing it yourself?

OT: is your sig an excerpt from "Catcher in the Rye"? Great book! Good old Holden ...

mo_dingo · Jun 29, 2006

TheRedBlur said:
right, although I am drunk as hell, I see your point. however, my engine runs waay to rich at idle, rich to the point of stall. which means it wouldn't go under, it would read WOT at 3/4 instead of 4/4.. can you dig? I do understant that the 94-95 computer is adaptive, but if the sensors are out of range, yet still funciton, th ecomputer will have a hell of a time. Can I set my TPS (regeardless if it needs to be done or not), can I do it wthout the connector disconnectged? w/o wire probes?

You have to have the tps installed, as well as the connector installed. YOu also have to backprobe the wires. No other way.

Remember, anything over 2.7V is considered WOT, so even if you are at 3/4 throttle, it's considered WOT. So a little tweaking of the tps won't change that. The little bit you can adjust the TPS will not make it go out of range. And this will not change your a/f ratio by any means.
Scott

HISSIN50 · Jun 30, 2006

Does it only require 2.7 TPS volts to be considered WOT, or is it 2.7 volts in addition to the baseline reading (like as on a fox, as I posted above)? 2.7 total sig return volts seems a bit low to me.

I had read that the two WOT thresholds (fox and 5N95) were very similar, but it wouldnt be the first time bad info was floating around.

tmoss · Jun 30, 2006

I know Probst put it at 2.7v but I don't recall that he qualified if that was on top of the base setting or if it was total voltage (including base setting).

HISSIN50 · Jun 30, 2006

Here's a post by S&2B's (I don't know him, nor have I talked with him, but he seems to have a decent handle on things). He indicates that it's 2.7 volts plus "turn on" voltage (turn-on voltage = the baseline ~1 volt, I presume).

http://forums.stangnet.com/showpost.php?p=5869635&postcount=8

I'd note that all the info in this post is fox-specific, in case someone knows the 94-95 TPS function to be different.

TheRedBlur · Jun 30, 2006

interesting stuff. I thought it might be a good idea to set the tps because I knew a couple of people who set them and had much better driveability. but really, the problem is having a cam with 274in and 282ex durations on a stock chip lol.

TheRedBlur · Jun 30, 2006

oh yah, the quote is from catcher in the rye. I like his style of writing, very conversational.

mo_dingo · Jun 30, 2006

HISSIN50 said:
Here's a post by S&2B's (I don't know him, nor have I talked with him, but he seems to have a decent handle on things). He indicates that it's 2.7 volts plus "turn on" voltage (turn-on voltage = the baseline ~1 volt, I presume).

http://forums.stangnet.com/showpost.php?p=5869635&postcount=8

I'd note that all the info in this post is fox-specific, in case someone knows the 94-95 TPS function to be different.

Hmmm...well I guess I need to datalog w/ my tweecer and see where the threshold lies....
scott

FlyBy763 · Jul 1, 2006

If the computer automatically sets to the voltage why do I get check engine lights about my TPS voltage? It doesnt happen at startup, just while driving. Not trying to argue, just curious.

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