Optimum Rpms for Power
12-14-2007, 03:38 PM
#11
5th Gear Member
Join Date: Mar 2007
Location: Orlando, FL
Posts: 2,031
RE: Optimum Rpms for Power
maybe i'm not putting enough thought into this, but if you shifted at 4500k, where max torque is made, you may not be staying in the highest average torque per time range. yeah, the highest torque may come at 4500 rpm, but shifting at 6000 rpm may give you a better average torque than if you shifted at 4500 rpm as this may put youat a very low torque to begin with in the next gear, hence causinga less than optimal torque average for the amount of time in the gear. think of it as you get more area under the torque curve for each gear if you shift at higher rpms rather than at the max torque rpm. this is why it is better to shift at higher rpms.... I think. my dynamics are a little rusty.
12-14-2007, 03:47 PM
#12
4th Gear Member
Join Date: Mar 2006
Location:
Posts: 1,470
RE: Optimum Rpms for Power
ORIGINAL: rap87
I'm wondering where our cars start to make optimum power, and then dip off, so I can know, if and when I should downshift for power etc.
I'm wondering where our cars start to make optimum power, and then dip off, so I can know, if and when I should downshift for power etc.
These speeds are where the product of the engine's torque and the gear's mechanical advantage are the highest, and thus will produce the fastest acceleration.If your car has the optional 3.55 gears, then the above speedswill beabout 5mph lower.Also, if youprogram a redline that's lower or higherthan 6500, then ratio your redline with 6500 to calculatethe different speed ranges.
12-14-2007, 08:22 PM
#13
1st Gear Member
Thread Starter
Join Date: Dec 2007
Location: Virginia Beach, VA
Posts: 128
RE: Optimum Rpms for Power
ORIGINAL: ski
If you increaseredline to 6500rpm after installing the tune, and your car has the stock 3.31 gears, then the "sweet spots" for downshifting are approx.35-60 mph for 2nd(75 mph redline), andapprox. 70-100 mphfor 3rd(112 mph redline). Obviously, 1st gear is best for speeds up to30 mph, but it's almost never usedwhen d/s becauseofextreme difficulty involved, unlessone isgoing only 5-10 mph(But you knew that).
These speeds are where the product of the engine's torque and the gear's mechanical advantage are the highest, and thus will produce the fastest acceleration.If your car has the optional 3.55 gears, then the above speedswill beabout 5mph lower.Also, if youprogram a redline that's lower or higherthan 6500, then ratio your redline with 6500 to calculatethe different speed ranges.
ORIGINAL: rap87
I'm wondering where our cars start to make optimum power, and then dip off, so I can know, if and when I should downshift for power etc.
I'm wondering where our cars start to make optimum power, and then dip off, so I can know, if and when I should downshift for power etc.
These speeds are where the product of the engine's torque and the gear's mechanical advantage are the highest, and thus will produce the fastest acceleration.If your car has the optional 3.55 gears, then the above speedswill beabout 5mph lower.Also, if youprogram a redline that's lower or higherthan 6500, then ratio your redline with 6500 to calculatethe different speed ranges.
12-14-2007, 10:51 PM
#15
5th Gear Member
Join Date: Mar 2007
Location: Orlando, FL
Posts: 2,031
RE: Optimum Rpms for Power
I think he meant it is optimal to downshift to third at around 70 to 100mph, not that 100mph was the redline for 3.31s. In the () he has 112 mph for 3rd gear. With my 3.55s I have hit the rev limitor plenty of times at the end of the 1/4 mile and my trap is usually around 107, so Im guessing my redline is right under 108.
12-15-2007, 10:39 AM
#16
4th Gear Member
Join Date: Mar 2006
Location:
Posts: 1,470
RE: Optimum Rpms for Power
ORIGINAL: tonyharp
I have 3.31 in mine and swear I am no-where near redline at 100 mph. Maybe mine got the wrong sticker. lol.
I have 3.31 in mine and swear I am no-where near redline at 100 mph. Maybe mine got the wrong sticker. lol.
ORIGINAL: AmericanSpeed
I think he meant it is optimal to downshift to third at around 70 to 100mph, not that 100mph was the redline for 3.31s. In the () he has 112 mph for 3rd gear. With my 3.55s I have hit the rev limitor plenty of times at the end of the 1/4 mile and my trap is usually around 107, so Im guessing my redline is right under 108.
I think he meant it is optimal to downshift to third at around 70 to 100mph, not that 100mph was the redline for 3.31s. In the () he has 112 mph for 3rd gear. With my 3.55s I have hit the rev limitor plenty of times at the end of the 1/4 mile and my trap is usually around 107, so Im guessing my redline is right under 108.
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