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-   -   Adding a capacitor to the TPS to improve mpg (

R.W.Dale 05-22-2022 11:44 PM

Adding a capacitor to the TPS to improve mpg
I read a post recently on that social media site that referred to adding a 22-25mfd capacitor between the sensor ground and signal of the TPS sensor of a Saturn like mine.

The logic is sound. Essentially you are delivering a smaller acceleration pump shot (carb terminology) by dampening the signal to the pcm electronically. Also supposed to filter out foot jitter.

But my question to those of you more electronically savvy than me is would this make for any measurable difference in ultimate fuel consumption?

Ecky 05-23-2022 02:40 AM

This was a mod a few years back in the Insight community. Some swore by it. I installed it and it made the car feel just a bit lazy to respond to inputs, and I couldn't measure any difference over a few months, so I pulled it.

I imagine on any cable throttle vehicle, it's really just affecting tip-in fuel. Or, in other words, with this mod it's going lean when you get on the gas, and going rich when you get off.

redpoint5 05-23-2022 01:17 PM

Yeah, I don't know how making a sensor less sensitive is supposed to improve anything.

Maybe if someone has a jittery foot it could help something? Still don't think it would affect MPG in any measurable way.

serialk11r 05-23-2022 09:33 PM

Seems dubious, because the tip in enrichment will at most overshoot stoichiometric by a little bit for a tiny fraction of a second.

Vwbeamer 06-01-2022 06:37 AM

You really need a flux capacitor and even then it only really helps at speeds over 88 mph.

cRiPpLe_rOoStEr 06-02-2022 01:35 AM


Originally Posted by serialk11r (Post 668634)
Seems dubious

And potentially dangerous too.

OliverSedlacek 07-11-2022 06:22 PM

The numbers are pretty easy to do. If you multiply the capacitance by the resistance of the TPS across the capacitor terminals you get a time constant. At 1-2k ohm for the TPS (educated guess) and 22uF capacitance, you get a time constant of 20-50 msec. This seems quite short in mechanical terms, so I'd be surprised if the effect is significant.

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