Optimal RPM for shifting Gears ? - Toyota Yaris Forums

JapRulezz · 03-05-2009, 08:39 PM

How can i get the most acceleration out my car during shifting gears
should i just push the rpm to the redline or what?

i am asking because whenever i read some cars specs i find (4 example )maximum Hp @ 3600 RPM or maximum torque @ 5500 RPM
and which translates acceleration more torque or hp ?

AlexNet0 · 03-05-2009, 09:03 PM

you will get the feel of where the powerband lies as you get used to driving the car more.

turboyaris · 03-05-2009, 09:11 PM

http://www.vettenet.org/torquehp.html

http://www.bgsoflex.com/shifter.html

Loren · 03-05-2009, 11:04 PM

Maximum acceleration will always come from revving as far as the engine will rev without hitting the rev limiter. The torque TO THE WHEELS will always be lower after you shift to the next higher gear than it is at the top of the lower gear, even though torque and horsepower decrease significantly at the top end.

The common misconception is that shifting earlier puts you at the torque peak after the shift into the next gear, which is great... but you'd still be putting MORE torque to the wheels if you'd stayed in the lower gear longer! Do the math if you need to prove it to yourself, but that's the way it is.

CASTREX · 03-06-2009, 10:37 AM

Some first hand experience...

I did some testing on my car with a G-tech device (measures acceleration)

And I always achieved better times on the 1/4 mile by shifting at 6,400rpm (red line) in comparison to shifting at 5,900-6,000 rpm

JapRulezz · 03-06-2009, 10:48 AM

i know about feeling ...... i want pure science and numbers !!

eTiMaGo · 03-06-2009, 11:22 AM

long straight road/drag strip, friend with a stopwatch, go over and over, each time at different shift points, you'll see the results right there

Loren · 03-06-2009, 11:38 AM

Engine HP x Gear Ratio x Final Drive Ratio x Factor for tire diameter = Effective HP

Fill in the blanks and do some math.

Ferret_san · 03-07-2009, 04:16 AM

1st ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline>

2nd ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline>

3rd ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline>

4th ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline>

5th ... is for pussies.

03-05-2009, 08:39 PM	#1
JapRulezz Drives: yaris sedan 2NZ-FE Join Date: May 2007 Location: Egypt Posts: 75	Optimal RPM for shifting Gears ? How can i get the most acceleration out my car during shifting gears should i just push the rpm to the redline or what? i am asking because whenever i read some cars specs i find (4 example )maximum Hp @ 3600 RPM or maximum torque @ 5500 RPM and which translates acceleration more torque or hp ?

03-05-2009, 09:03 PM	#2
AlexNet0 View User's Garage Drives: '07 Yaris 3dr Join Date: Nov 2008 Location: Rockland, ME Posts: 1,638	you will get the feel of where the powerband lies as you get used to driving the car more. __________________ ---------- MI-YW ----------

03-05-2009, 11:04 PM	#4
Loren What? Drives: 2007 Yaris LB Join Date: Nov 2008 Location: Safety Harbor, FL Posts: 1,006	Maximum acceleration will always come from revving as far as the engine will rev without hitting the rev limiter. The torque TO THE WHEELS will always be lower after you shift to the next higher gear than it is at the top of the lower gear, even though torque and horsepower decrease significantly at the top end. The common misconception is that shifting earlier puts you at the torque peak after the shift into the next gear, which is great... but you'd still be putting MORE torque to the wheels if you'd stayed in the lower gear longer! Do the math if you need to prove it to yourself, but that's the way it is. __________________ ----------------------- Loren@InvisibleSun.org -----------------------

03-06-2009, 11:22 AM	#7
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	long straight road/drag strip, friend with a stopwatch, go over and over, each time at different shift points, you'll see the results right there __________________ The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ...

03-06-2009, 11:38 AM	#8
Loren What? Drives: 2007 Yaris LB Join Date: Nov 2008 Location: Safety Harbor, FL Posts: 1,006	Engine HP x Gear Ratio x Final Drive Ratio x Factor for tire diameter = Effective HP Fill in the blanks and do some math. __________________ ----------------------- Loren@InvisibleSun.org -----------------------

03-05-2009, 09:11 PM	#3
turboyaris Drives: 2007 Yaris Sedan Join Date: Jan 2007 Location: Southern New Jersey Posts: 459	http://www.vettenet.org/torquehp.html http://www.bgsoflex.com/shifter.html

03-06-2009, 10:37 AM	#5
CASTREX Who said Yaris was slow? View User's Garage Drives: Yaris T-Sport 2008 Join Date: Nov 2006 Location: Costa Rica Posts: 1,287	Some first hand experience... I did some testing on my car with a G-tech device (measures acceleration) And I always achieved better times on the 1/4 mile by shifting at 6,400rpm (red line) in comparison to shifting at 5,900-6,000 rpm

03-06-2009, 10:48 AM	#6
JapRulezz Drives: yaris sedan 2NZ-FE Join Date: May 2007 Location: Egypt Posts: 75	i know about feeling ...... i want pure science and numbers !!

03-07-2009, 04:16 AM	#9
Ferret_san Hack.... What hack ?? View User's Garage Drives: 07 YR Join Date: Aug 2007 Location: Australia - BrisVegas Posts: 285	1st ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline> 2nd ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline> 3rd ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline> 4th ... 1-onethousand...2-onethousand...3-onethousand...4-onethousand...5-onethousand...6-onethousand...<change!>...<redline> 5th ... is for pussies. Last edited by Ferret_san; 03-07-2009 at 04:17 AM. Reason: That's RPM not seconds you skirts !

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