Throttle %

[droppinbottom]

I have been tuning my car the past couple of days and I noticed that with th car just at idle my logger shows about 11% throttle and my afc shows 0% throttle. Even while driving the two are off by about 10%. Does anyone else's do this?

 

[ericmetcalf11]

Yes.
Logger should read 10% on TPS.

Eric
no sig

 

[alex99gst]

The SAFC shows idle as being 0%. It's fine.

 

[droppinbottom]

I figured it would be alright but just never noticed it before. You would think they would both be the same since they are both getting the signal off the ecu.

 

[steve]

The SAFC scales it's TPS value. Whatever the lowest and highest voltages it's seen are used as 0 and 100%

Steve

 

[ken06]

So if the tps is 95% under full throttle, does that mean I need to adjust my throttle body or is that the maximum?

 

[steve]

So if the tps is 95% under full throttle, does that mean I need to adjust my throttle body or is that the maximum?

Depends. If the TPS is correctly adjusted according to the FSM and there is nothing under the pedal keeping it from full movement then what the TPS reads at WOT is what it reads. The fact that it's not 100% doesn't matter.

On the othe hand I thought 2G dataloggers scaled their outputs like the SAFC, which means it has seen higher voltages at some point in the past and the throttle is not opening as far now as it did. That doesn't mean adjust the TPS but it does mean investigate why.

You should only adjust the TPS based on what it's doing closed on a 1G and by where the IPS switches with the feeler gauge inserted on a 2G.

Steve

 

[droppinbottom]

Thanks steve. On my logger the higest it will read is 96% and on the safc it will read 100% at wot.