TPS and performance gains???

[RX-1snow]

I've been reading some posts from supertuner, which , I must say are very informative and I'm certain all viewers appreciate it. But.. I am confused about the throttle position sensor voltage test and its affect on performance.

I know where it is on the side of the carbs and you explained how to test it . What does this thing do exactly? I need to understand what I'm doing before I;m comfortable tweaking anything.

This probably a stupid question , but I had to ask. Also you say it may need adjusting. How?? ...to what voltage?? and why ? Somone mentioned rotating the sensor after you loosen it?? What will this do to the engine ??Does it affect timing at all?

Please help if anyone has anawers . Thanks again all.

 

[Toolman]

The TPS is the sensor that tells the computer how far open the throttle is. Nearly every motor vehicle uses one to monitor engine load. This info is used to control timing, transmission shifting and lock/unlock. They are also on diesels even though diesels do not have throttle blades. What they are doing is showing the engine it is under more load and has more airflow to fool the timing map and give it more timing sooner.

 

[RX-1snow]

What are normal values of TPS voltage??

 

[Toolman]

Initiall I saw .76 closed and 3.8 open. Now 1.04 closed and 4.09 open.

 

[1xr]

What does the new values on the higher level of voltage efect timing, will the higher voltage at w.o.t. advance of retard timing?

 

[Blue shadow]

Can I used a digital multimeter to do this? If so were does it have to be pointing at on the multimeter,Thanks

 

[Fergie]

yes you can use a multimeter to check . but what i'm wondering is will i have to run a higher octane fuel if i change from .76 to 1.07 ?

 

[race24x]

I was thinking the same thing Flyin. I know on my race car or any car you get more power from better fuel by advancing your timing otherwise you are throwing away your money. But if you advance timing to support the extra octane you can get power gains

 

[Toolman]

I don't believe that total timing will be affected, the timing will be added sooner in the curve but I don't think it will add more, just sooner.

 

[race24x]

But if you add timing sooner when there is more demand for power you can cause engine ping rather than later in the RPMs. Like going up a hill with a car or a heavy load you notice detonation with lower octane fuel and an improper timed engine. Not at peak RPM going down the highway

 

[snowbeast]

Hi toolman did you notice any more performance anywere thru the powerband after you reset the tps? And standing at the clutch side,did you rotate the tps left--cc wise or right--cc wise to change to higher numbers,and when done was it all the way it would go.

 

[Toolman]

Rode in the Cable, WI area this weekend. Got about 200 miles. Did notice increased low/mid range. Got out on the lakes though and would not pull past 110. Rpms stayed 10,400 to 10,500. Before they would begin to climb past about 110 due to my helix getting shallow and not shifting. Also the coolant light came on 2 times on packed, groomed trails but it has never come on in the past. I will be setting mine back to stock tomorrow.

 

[170plus]

tps

thanks for the info guys,will be leaving my tps right where it is,too many rr beds up here to lose much topend speed,we have about 10 inches of new snow here in aroostook county and it is still pounding ,supposed to go all day too,maybe up to 16 inches they predicted,gonna finally get the county into good shape for us sledders,more coming the middle of the week too by the sounds,thanks again for posting info