Go Back   EcoModder Forum > EcoModding > Hypermiling / EcoDriver's Ed
Register Now
 Register Now

Reply  Post New Thread
Submit Tools LinkBack Thread Tools
Old 05-17-2022, 09:10 PM   #1 (permalink)
EcoModding Apprentice
Join Date: May 2008
Location: Ohio
Posts: 109

Silver EP3 - '02 Honda Civic Si
Thanks: 2
Thanked 1 Time in 1 Post
2019 Civic Si, shift points?

Any thoughts on sifting techniques for small turbo 4 bangers? It seems to not mind being short sifted, even as low as 2000 rpm.

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

Old 05-18-2022, 01:02 AM   #2 (permalink)
Master EcoModder
freebeard's Avatar
Join Date: Aug 2012
Location: northwest of normal
Posts: 24,769
Thanks: 7,005
Thanked 7,887 Times in 6,454 Posts
I don't have a 'small turbo 4 banger' but my N/A three-cylinder XFi has a shift light that prompts you to short shift. Any tachometer with a shift light should give the same functionality.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster


Back in my day there was so much toilet paper and eggs that we would throw them at the houses of our enemies

  Reply With Quote
Old 05-21-2022, 11:19 PM   #3 (permalink)
Master EcoModder
Ecky's Avatar
Join Date: Dec 2011
Location: New Zealand
Posts: 4,833

ND Miata - '15 Mazda MX-5 Special Package
90 day: 40.81 mpg (US)

Work Vehicle - '17 Toyota RAV4
90 day: 31.89 mpg (US)
Thanks: 2,735
Thanked 2,394 Times in 1,482 Posts
The K series in my Insight delivers the best fuel economy when I shift extremely early. Basically, if I'm above idle in the next gear, I'll get better economy by shifting at that point. Dropping it into 6th at 27mph and cruising along at 800rpm ends up being better at the pump than holding onto the gear longer.
  Reply With Quote
The Following 2 Users Say Thank You to Ecky For This Useful Post:
MetroMPG (06-11-2022), slurp812 (05-22-2022)
Old 05-22-2022, 02:42 AM   #4 (permalink)
EcoModding Apprentice
Join Date: Apr 2022
Location: California
Posts: 166

Cx9 - '18 Mazda CX9 Grand Touring
90 day: 31.41 mpg (US)

Prius - '10 Toyota Prius III
90 day: 57.8 mpg (US)

Tundra - '00 Tundra V6 long bed base work truck
90 day: 19.4 mpg (US)
Thanks: 95
Thanked 87 Times in 60 Posts
There is no one-size fits all shift point template. If you're accelerating using 25 horsepower, your most economical shift points will probably be lower than if you're accelerating at 50 horsepower or 75 or 100hp. Studying a BSFC map can help you see when to shift at various loads.

A scangauge can help, but the numbers on the display lag what is happening in real time
  Reply With Quote
The Following User Says Thank You to Drifter For This Useful Post:
slurp812 (05-22-2022)
Old 05-23-2022, 10:39 PM   #5 (permalink)
Master EcoModder
Join Date: Jan 2012
Location: United States
Posts: 1,741

spyder2 - '00 Toyota MR2 Spyder
Thanks: 104
Thanked 402 Times in 309 Posts
With a turbo engine I would drive with some instrumentation to start with so you build muscle memory for various rpms and torque request. You basically just do not want the engine to run super rich at high boost, and you might be surprised how easily it will get to the enrichment zone if you haven't watched a lambda gauge.

Shift point is mostly unimportant as long as you keep the engine efficiency high as much as possible. That means a little below the highest torque you can get while still running stoichiometric, and use as high of a gear as needed to avoid running at low load.

If that wasn't concrete enough, get Torque + an OBD scanner, stick your smartphone on the dash, and learn to back off if the AFR drops below 14.7.

  Reply With Quote
The Following User Says Thank You to serialk11r For This Useful Post:
Ecky (05-23-2022)
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