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Old 10-04-2020, 04:56 AM   #131 (permalink)
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Quote:
Originally Posted by JulianEdgar View Post
Interesting! I wonder if most of that 50 ohm variation is noise? You can be sure the ECU filters the TPS input.

At this stage, I'd just go ahead and do some aero testing like windows up/down and see what happens. If you are consistent in the change in speed, and the change in speed makes sense, then do some more subtle aero mod testing.
I was also thinking about how the ECU uses that sensor. It doesn't directly determine anything. So if that sensor has a little bit of variation (not necessarily all of what I am finding) then it won't bother the ECU because it is only looking for major changes. I.e enrichening at WOT.

I need to grease the 2 rear regulators up then hopefully some testing will be done. I still don't have a great road found, but I have 2 that show some promise. The speed limit on one of them is pretty low though. Only 45 mph the other is 55 posted, so "60-65" mph to the general public

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Old 10-04-2020, 05:17 AM   #132 (permalink)
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Quote:
Originally Posted by M_a_t_t View Post
I was also thinking about how the ECU uses that sensor. It doesn't directly determine anything. So if that sensor has a little bit of variation (not necessarily all of what I am finding) then it won't bother the ECU because it is only looking for major changes. I.e enrichening at WOT.

I need to grease the 2 rear regulators up then hopefully some testing will be done. I still don't have a great road found, but I have 2 that show some promise. The speed limit on one of them is pretty low though. Only 45 mph the other is 55 posted, so "60-65" mph to the general public
No, it will also be vital in providing the right acceleration enrichment and transient timing advance during throttle changes.

Probably has (my guess only) 1/10th of a second filter.

What are the rear regulators?

(Addition: In the very old days - like the late 1970s - EFI cars in fact ran throttle position switches rather than sensors - just idle and full throttle contacts. My 1977 BMW 3.0si with Bosch L-Jetronic had that.)

Last edited by JulianEdgar; 10-04-2020 at 05:33 AM.. Reason: addition
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Old 10-04-2020, 12:30 PM   #133 (permalink)
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I meant in this specific case. If I go to pass someone and open the throttle 2.3% its not going to enrich (I have watched the wideband). Which means it should be close.

Rear window regulators

My 86 300zx is like that. For the manual transmission anyway. The auto has a variable rate one.
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Old 10-05-2020, 11:33 AM   #134 (permalink)
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Had to go back 4 pages to see what the op issue was. Tps are no longer a constant resistance strip like an audio amp potentiometer, they are more like a wire wound resistor such that each decrement is an additional series resistor added. You cant get to 25 more (half spacing) ohms linearly. The steps are close together, sometimes within the width of the wiper so that it is conceivable that .003" wiper arm movement makes or breaks contact with an element. Won't even go into noise and dirt in the measurement system affecting values. The actual values are readable but I will not attempt to tell you where they are PID'ed in Torque. The software types know about this issue so they use a bunch of sensors to decide engine load requirements and adjust accordingly.

Suffice to say: engine load is reasonably close ratio to throttle position, and probably within the users measurement system error bucket. Unfortunately, you might have to live with using engine load instead of throttle position.

Last edited by Piotrsko; 10-05-2020 at 11:44 AM..
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Old 10-05-2020, 05:48 PM   #135 (permalink)
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Quote:
Originally Posted by Piotrsko View Post
Had to go back 4 pages to see what the op issue was. Tps are no longer a constant resistance strip like an audio amp potentiometer, they are more like a wire wound resistor such that each decrement is an additional series resistor added. You cant get to 25 more (half spacing) ohms linearly. The steps are close together, sometimes within the width of the wiper so that it is conceivable that .003" wiper arm movement makes or breaks contact with an element. Won't even go into noise and dirt in the measurement system affecting values. The actual values are readable but I will not attempt to tell you where they are PID'ed in Torque. The software types know about this issue so they use a bunch of sensors to decide engine load requirements and adjust accordingly.

Suffice to say: engine load is reasonably close ratio to throttle position, and probably within the users measurement system error bucket. Unfortunately, you might have to live with using engine load instead of throttle position.
TPS is just being used to check that a constant throttle is being held - no more or less.

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