TPS % and throttle Volts? - SRT Forums

AudioFan · 10-19-2009, 06:49 PM

Is the TPS % and throttle volts the same reading? From the same sensor?

I need to tune my W/I based on TPS signal, so I need to know if this are the same readings

Thanks

nutz · 10-19-2009, 11:10 PM

no throttle % should read the % of throttle (

)

TPS voltage will be the voltage of the sensor (its a 5v sensor) usually between .60v closed to 3.8v WOT (dont know exact I use the EMS soo...)

AudioFan · 10-19-2009, 11:32 PM

Quote: Originally Posted by nutz

no throttle % should read the % of throttle (

)

TPS voltage will be the voltage of the sensor (its a 5v sensor) usually between .60v closed to 3.8v WOT (dont know exact I use the EMS soo...)

Yeah I know, maybe my question is not that clear

I know % and volts, but I mean, they are taken from the same sensor? it is the same signal, just saying it in different terms, one is a conversion to a % and the other is the raw volts output of the sensor?

I'm just trying to figure my setting points for W/I based on the TPS, because something it's weird, my TPS on the scangauge goes from like 3/7% to only 65/70%, which could be normal

But the Throttle volts goes from 0.00 to just about 2.89 / 2.90, and I thought it should go much closer to 5 volts, 4.x something

So I have my meth progessive starting point too high (2.7 volts) and It's not reaching full potential since the full on point is at 4 volts!

So if the throttle volt reading of the scangauge IS the raw output of the TPS sensor, I have to make some changes on my W/I

Thanks, I hope it is more clear now

raul-01 · 10-20-2009, 12:41 AM

Quote: Originally Posted by AudioFan

Yeah I know, maybe my question is not that clear

I know % and volts, but I mean, they are taken from the same sensor? it is the same signal, just saying it in different terms, one is a conversion to a % and the other is the raw volts output of the sensor?

I'm just trying to figure my setting points for W/I based on the TPS, because something it's weird, my TPS on the scangauge goes from like 3/7% to only 65/70%, which could be normal

But the Throttle volts goes from 0.00 to just about 2.89 / 2.90, and I thought it should go much closer to 5 volts, 4.x something

So I have my meth progessive starting point too high (2.7 volts) and It's not reaching full potential since the full on point is at 4 volts!

So if the throttle volt reading of the scangauge IS the raw output of the TPS sensor, I have to make some changes on my W/I

Thanks, I hope it is more clear now

All I know is that when I spliced a wire from my CMGS controller into my TPS. I max at 3.58 volts during WOT. You can also test it by flooring it when the car has the key turned to the "on" position. I have mine setup at 2.7 volts and max at 3.0 volts. I believe thats when closed loop begins.

Check your wiring man... I don't think it should be that low. If needed, change it to 2.2 min and 2.7 max.

apexcrazy · 10-20-2009, 07:34 AM

ECU goes wot at 2.7 volts . My max is 3.2 volts a WOT . Both readings come from the Throttle Position Sensor . One is a calculation of the other .

AudioFan · 10-20-2009, 09:03 AM

Here are some pics (phone) from my Scangauge reading TPS % and Volts, car off, key on ON position, no throttle and WOT

So I guess I need to adjust my settings, is this normal, that at WOT the volts are so low?

**04blusrt_4** · 10-20-2009, 10:30 AM

Quote: Originally Posted by apexcrazy

ECU goes wot at 2.7 volts . My max is 3.2 volts a WOT . Both readings come from the Throttle Position Sensor . One is a calculation of the other .

Its different by ECU. I think stage 0 through 2 are 2.66volts, stage 3 is 2.33 volts.

Quote: Originally Posted by AudioFan

So I guess I need to adjust my settings, is this normal, that at WOT the volts are so low?

And the voltage shouldnt be that low, you either have A LOT of things spliced in that is taking up the voltage or your TPS sensor is installed poorly. When you install it on a new TB, you should be pushing it on and rotating it slightly into place, if youre rotating the wrong way you will bring down the voltage.

AudioFan · 10-20-2009, 01:20 PM

Quote:

Its different by ECU. I think stage 0 through 2 are 2.66volts, stage 3 is 2.33 volts.

I have a Stage 3 ECU

Quote:

And the voltage shouldnt be that low, you either have A LOT of things spliced in that is taking up the voltage or your TPS sensor is installed poorly. When you install it on a new TB, you should be pushing it on and rotating it slightly into place, if youre rotating the wrong way you will bring down the voltage

I´ll check on that, from what I remember I only have the WOT box spliced into the TPS signal, the Toybox I think it doesn´t connects to the TPS (if it does I also have it conected)

And I spliced the TPS signal for the Water Injection to the WOT box, so I didn´t have to go all the way to the motor and mess with the TPS again

WOT box works fine! no problem there

I will also check the conection of the sensor, maybe it wasn´t rotated after installed on the TB

moreause · 11-17-2009, 04:00 AM

nah voltage is normal

for some reason the aeroforce gage read 0V at closed throtle
when in fact it is around .7
if you want the real voltage use the % and multiply by 5V

apexcrazy · 11-17-2009, 07:54 AM

^^^ you are right . And I thought I knew everything

I checked my TPS raw voltage at my Wot Box (via computer interface) . Its seeing 3.96 volts , but my gauge shows 3.2 . I think the ECU assumes the lowest voltage is closed throttle , and compensates , rescaling to show closed throttle at zero .

Moral of the story ? dont set your Wot Box to what the ECU thinks is WOT voltage , its higher than the TPS voltage shown from the OBD-II port .

forcefedjunkie · 11-19-2009, 11:40 AM

There was a thread here discussing this a few years ago but I can't find it. There are two conversions for this data coming from the PCM. I don't recall why we chose the one we did, maybe because it agreed with a DRBIII, I don't remember. The current reading zero's out the offset, giving you the voltage span but not the absolute values. We can change this if it would be more useful to read the actual values. Let me know what you guys think.

Todd

moreause · 11-19-2009, 01:17 PM

i would say the absolte value would be better
it took me a a couple of minute before figuring this one out

and it was causing probleme to a couple of friend when they installed device that refer to the tps voltage... they were like

could be a good mod for futur use

by the ways still waiting for your aeroscan...to plug to my incarpc

AudioFan · 11-19-2009, 05:23 PM

After you know how it works, there is no problem, it's easy

But If you don't know that, people may think theres something wrong, with the sensor, with the gauge,, PCM or something

After knowing this, I Explained also to another person having trouble with the WOT box

So, In my opinion it would be better to show the raw output of the sensor

forcefedjunkie · 11-21-2009, 10:51 PM

I checked my gauges, which are version 2.6, and they read .82 at idle. Those with readings near 0, what version do you have? I think we changed this a while ago but I don't know exactly when. I've also added a new parameter called "Throttle Volts Raw", which actually is another separate parameter available from the PCM than what we have had, which is officially called "Throttle Volts After Diagnostics".

Todd

apexcrazy · 11-22-2009, 12:56 AM

^^ I just got my Dual Interceptor installed last night & I noticed that the throttle volts is a "raw voltage" (0.78v at closed throttle), as opposed to the older single version (0.0v at closed) I took out .
I am a SCT PRP user , and in a few areas of the ECUs programming there are parameters that deal with tps voltage . Im guessing that when the ECUs tables show a voltage value , that these values are post tps voltage offset .

And by the way , these new Interceptors are BEAUTIFUL ! I need to take pics & get them posted .