power @ RPM Torgue @ RPM

[zerfiro]

hello recently i m into cars
and saw there was a sign that said

Horse Power @ Revolution Per Minute and Torque @ Revolution Per Minute

let say
(175 horsepower) @ 6400 revolution per minute or 166 foot pound torque @ 5200 rpm
does this mean i get most power at 6400 revolution per minute and power fall short after that?
i need some1 clear this up for me plz
thanks


EDIT: woops wrong forum sorry might go under GT5p Tuning or Cars in general or something

 

[nd 4 holden spd]

First, can I ask that you type the full words.(It's part of the GTP Code of Conduct)

Now, yes it means that's where you're getting peak power, and after that power will begin to drop off. In your example, peak power is at 6400rpm, and peak torque is at 5200rpm.

 

[sladey121]

YES you are right.

 

[peter_vod69]

Yes, BUT you should take the car to the redline in most cases (Dodge Viper being a possible exception) because you want the revs in the next gear to be as close to the peak torque as possible.

(in a racing/absolute performance situation anyway)

 

[niky]

Depends on the torque curve. On many new turbodiesels, it pays to short-shift, because at 4500-5000 rpm, most diesels make absolutely nothing in the way of useable power so high up in the powerband.

In most cases, though, generally you want to shift at redline, even if it feels like the car isn't making as much power.

 

[Paulie]

YES you are right.

Was that worth the thread revival?

 

[sladey121]

He wanted an answer, so i gave him one. No need to get smart about it!!!

 

[Kryz11]

YARR!!! Everyone was right YARRRR!

Another good way is look at the Torque and HP graphs. and see when it's best to shift and try it out for your self. I remeber driving the old custom tuned Corvette in GT5, I noticed going into RedLine seemed the Speed was getting slower and slower, and changing gears before it made it go fast. But for most cars shift at redline or even after redline to the point the engine can not take it, so just split second before it.

 

[premhz]

Have you tried revving out the evo x and latest STi to redline? The evo begins to struggle at 6500(max power is 6600) holding it to 7000 is such a waste of time,it barely gains anymore speed,same for the Sti,it has a 8000rpm redline but it`s best work is all done by 6500rpm,not only can your hear the engine note begin to taper off and feel the engine start to strain but you can also feel the power tapering off and observing how the speedo begins to stop gathering speed,then when you change up a gear and you observe it again,you see how consistant it rise`s untill you hit max power rpm and then it begins to taper off again...holding the gear untill redline is costing you time,short shift them and you`ll see the difference.

 

[corporatesteve]

Have you tried revving out the evo x and latest STi to redline? The evo begins to struggle at 6500(max power is 6600) holding it to 7000 is such a waste of time,it barely gains anymore speed,smae for the Sti

thats becuase of the turbo

full boost is hit at like 35000 rpm ... any higher means nothing ... oh wait are we talking about real life?

 

[NLxAROSA]

He wanted an answer, so i gave him one. No need to get smart about it!!!

He already got an answer, EIGHT months ago. Reviving this thread was pointless. Add to that he hasn't visited these forums since November 2008...

 

[PAPPACLART]

YARR!!! Everyone was right YARRRR!

Another good way is look at the Torque and HP graphs. and see when it's best to shift and try it out for your self. I remeber driving the old custom tuned Corvette in GT5, I noticed going into RedLine seemed the Speed was getting slower and slower, and changing gears before it made it go fast. But for most cars shift at redline or even after redline to the point the engine can not take it, so just split second before it.

You are correct:tup:

Just to clarify, with very large engines (at a low state of tune) Turbo Diesels and petrol turbo's with a torque curve that tails off shaprly, short shifting can yield better results but this is not always the case in every gear.

Rather than looking at power and torque curves, the best way to determine 'in-gear' performance at any speed or any rpm point is to look at thrust curves which are measure in lbs.

The vast majority of cars that have gear ratios that match the engine performance very well; you will find that although the torque curve tails off near to the redline, (equally will thrust) wheel thrust should still be greater than if you was to change up to a new gear.

I will find a my Spreadsheet/calculation which is for motorcycles and edit it for cars, if you input your torque curve/gear ratio info it will work out the thrust in each gear, tho you also need wheel measurments too.