Icculus88

to me hp and tq are a general misconception to the public. both have some sort of "power" meaning but yet its entirely more complex(obviously) than the general public realizes. And the term tq gets you going hp keeps you going is the easiest way to level the playing field.

i think we should leave it at that.

Oh, im in the mids of ME right now btw.

ski

Stick with it! We need more engineers and scientists to help solve the world's energy problems. Now, if we can just keep politicians out of the equation.

AmericanSpeed

Problems are what keeps us engineers employed!!!

JasperGT

Very true! Engineering FTW!!! Anyways back to work...

07musclemustang

um wow ok my brain kinda crampped up a bit
NORM please break it down to like a grade 12 level science knowledge, not all of us are engineers but we still wanna learn.

07musclemustang

ok took a swig of beer and feel much better now

Norm Peterson

F = M * a

You know what the car mass "M" is.

Figure out what all the individual forces are that make up the total force "F" and which way they act (use + for acceleration forces, - for drag forces). Add them up considering sign to get result "F".

Solve for acceleration "a".



(take a breath now)

A somewhat better solution involves a few rotational inertia terms "I", their rotational accelerations ("a"), and the torques "T" required to make that happen.

Those rotational accelerations need to be consistent with the straightline acceleration "a" calculated by F ÷ M above (which sounds a lot more complicated than it really is, since you already know the gearing and the tire revs/mile that relate road speed to the wheel and other powertrain rpms).


Norm

07musclemustang

ha ha duh yeah i got it Force equals Mass Times Acceleration I knew that.. (i did take physics) so ok but what about the TQ to HP?
Mass is a set variable
Acceleration your gonna need some formula to figure out from gear ratio/ trans ratio/ hp/ tq/
SO how does hp/tq effect the equation??? NORM help me out, does a guy really want to gain 5hp if it means loosing 5ft/lb tq per say? Ive heard TQ is better and I kinda gotta agree but what does it really mean.
Does the TQ only affect the lower end of the eqation and Hp the top?
AHHH brain cramp.... Wheres some BEER

07musclemustang

and sorry forgot to add force would dictate how fast the car could go against the wind and rolling resistance.. I think ive got that down.

Again norm come move up to alberta and be my neighbor.. Kinda like Wilson and Tim the Tool Man Talylor....HhhHhHHHAAHHAHAHAHA.

Norm Peterson

Pop quiz:

[Torque] x [TrannyGearRatio] x [AxleGearRatio] x [SomeKindOfEfficiencyNumber] ÷ [TireRollingRadius] = ?


Depends. If you never get to see the rpm where the extra 5 HP is gained, or only see that rpm briefly you want to keep the torque (maybe think autocross or road-racing on a course with mostly slow corners). If whatever your use is keeps your revs up near peak HP rpm once they get up there, you need the peak HP more than the midrange torque that you don't use much (think NASCAR at Daytona).


Linky


Norm