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View Full Version : Optimal RPM for shifting Gears ?

JapRulezz
03-05-2009, 09:39 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, 10:03 PM
you will get the feel of where the powerband lies as you get used to driving the car more.
turboyaris
03-05-2009, 10:11 PM
http://www.vettenet.org/torquehp.html

http://www.bgsoflex.com/shifter.html
Loren
03-06-2009, 12:04 AM
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, 11:37 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, 11:48 AM
i know about feeling ...... i want pure science and numbers !!
eTiMaGo
03-06-2009, 12:22 PM
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 :wink:
Loren
03-06-2009, 12:38 PM
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, 05:16 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.