Toyota Yaris Forums - Ultimate Yaris Enthusiast Site
 

 


 
Go Back   Toyota Yaris Forums - Ultimate Yaris Enthusiast Site > Technical Forums > Performance Modifications
  The Tire Rack

 
 
Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 12-20-2015, 09:14 PM   #8
invader166
Pumpman
 
Drives: 2019 Kia Soul EV Base
Join Date: Dec 2014
Location: Langley, BC
Posts: 434
Quote:
Originally Posted by tmontague View Post
There is no way that your rpm's dropped by 200. Gear ratios are a fixed thing that will not be changed regardless of air flow (unless wheel size or other is affected).

Your engine could very well be working less hard but the rpm's should be the same. Someone please correct me if i'm wrong
Yes way! While the gear ratios are constant (like you said), it's been demonstrated that it is possible to drop the RPM at which the engine reaches it's torque peak!

For example, Tooter was able to do this with his intake manifold spacer design:

http://www.yarisworld.com/forums/showthread.php?t=49609

Quote:
The intake valves on your engine open and close. They are abruptly starting and stopping the incoming air. Now the incoming air has inertia so starting and stopping creates pulses, or pressure waves that travel back and forth inside of the intake manifold runners. If the runners are made longer the pulses will resonate harmoniously at a lower frequency because they have a longer distance to travel to get to the other end. A lower harmonious frequency means reaching peak torque at a lower rpm. More torque at lower rpm means the engine pulls stronger without needing to rev higher.
__________________
"I would rather loose by a mile in a car I built myself, then win by an inch in a car that was built for me." - Moog
invader166 is offline   Reply With Quote
 

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
SIMOTA Carbon Box intake vs AFE short ram Intake walt101786 Performance Modifications 17 10-05-2012 03:01 PM
OEM Air Intake System bad Items for Sale by private party 2 04-04-2012 10:03 PM
Cold Air Intake geniusmusicman General Yaris / Vitz Discussion 4 02-17-2010 08:28 PM
simota cf cold air AlexNet0 Performance Modifications 10 04-29-2009 09:10 AM


All times are GMT -4. The time now is 09:29 PM.




YarisWorld
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2026, vBulletin Solutions Inc.