Go Back   EcoModder Forum > EcoModding > EcoModding Central
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 05-23-2022, 12:44 AM   #1 (permalink)
EcoModding Lurker
 
Join Date: Aug 2013
Location: Arkansas
Posts: 57

The silver bullet - '01 Saturn S Sohc 5 speed
90 day: 40.84 mpg (US)
Thanks: 0
Thanked 24 Times in 15 Posts
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?

__________________
Too much junk to list. From a 10mpg caddy limo to a 5 speed Saturn



  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 05-23-2022, 03:40 AM   #2 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 4,845

ND Miata - '15 Mazda MX-5 Special Package
90 day: 41.06 mpg (US)

Work Vehicle - '17 Toyota RAV4
90 day: 32.28 mpg (US)
Thanks: 2,748
Thanked 2,405 Times in 1,489 Posts
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.
  Reply With Quote
The Following 4 Users Say Thank You to Ecky For This Useful Post:
EcoCivic (12-27-2022), mpgmike (06-04-2022), pgfpro (07-11-2022), redpoint5 (05-23-2022)
Old 05-23-2022, 02:17 PM   #3 (permalink)
Human Environmentalist
 
redpoint5's Avatar
 
Join Date: Aug 2010
Location: Oregon
Posts: 11,081

Acura TSX - '06 Acura TSX
90 day: 28.24 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 25.39 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)
Thanks: 3,779
Thanked 4,096 Times in 3,107 Posts
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.
__________________
Gas and Electric Vehicle Cost of Ownership Calculator







Give me absolute safety, or give me death!
  Reply With Quote
Old 05-23-2022, 10:33 PM   #4 (permalink)
Master EcoModder
 
Join Date: Jan 2012
Location: United States
Posts: 1,742

spyder2 - '00 Toyota MR2 Spyder
Thanks: 104
Thanked 402 Times in 309 Posts
Seems dubious, because the tip in enrichment will at most overshoot stoichiometric by a little bit for a tiny fraction of a second.
  Reply With Quote
Old 06-01-2022, 07:37 AM   #5 (permalink)
EcoModding Apprentice
 
Join Date: Jan 2009
Location: Macon,GA
Posts: 176

Ruint Taco - '19 Toyota Tacoma SR Double Cab
90 day: 23.76 mpg (US)
Thanks: 124
Thanked 43 Times in 34 Posts
You really need a flux capacitor and even then it only really helps at speeds over 88 mph.
__________________

  Reply With Quote
Old 06-02-2022, 02:35 AM   #6 (permalink)
It's all about Diesel
 
cRiPpLe_rOoStEr's Avatar
 
Join Date: Oct 2012
Location: Porto Alegre, Rio Grande do Sul, Brazil
Posts: 11,573
Thanks: 0
Thanked 1,460 Times in 1,303 Posts
Quote:
Originally Posted by serialk11r View Post
Seems dubious
And potentially dangerous too.
  Reply With Quote
Old 07-11-2022, 07:22 PM   #7 (permalink)
EcoModding Lurker
 
Join Date: Jul 2022
Location: South Bucks
Posts: 14
Thanks: 5
Thanked 4 Times in 4 Posts
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.
  Reply With Quote
Old 12-16-2022, 10:07 AM   #8 (permalink)
Not Doug
 
Xist's Avatar
 
Join Date: Jun 2012
Location: Show Low, AZ
Posts: 11,642

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 35.35 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 34.2 mpg (US)

Gramps - '04 Toyota Camry LE
90 day: 35.39 mpg (US)

Don't hit me bro - '05 Toyota Camry LE
90 day: 32.98 mpg (US)
Thanks: 7,137
Thanked 2,147 Times in 1,647 Posts
I am supposed to be sleeping, but my book on tape ended right after I went back to bed, so I decided to restart it and Meat! I'll give my sister a box of Christmas meat! Best I can do!
NOW GET ME MORE PICTURES!

Of course, nothing is working right, and while kicking against the pricks, I saw this thread.

The guy on Robot Cantina installed an electronically-controlled throttle body in front of the throttle body in his Saturn and wired it to even out airflow.

When it reduced airflow the car reduced fuel to compensate, overriding the cable throttle:




Now, to stare into the void once more.

__________________
"Oh if you use math, reason, and logic you will be hated."--OilPan4
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2023, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com