Max Speed of a Porsche 944 Turbo - 113317.4 W

  • Thread starter Thread starter tomboi03
  • Start date Start date
  • Tags Tags
    Max Speed
AI Thread Summary
The Porsche 944 Turbo has an engine power of 217 hp, with 70% of that power, or 151.9 hp, reaching the wheels after accounting for drivetrain losses. The total mass of the car and driver is 1530 kg, with two-thirds of the weight over the drive wheels. The calculated power output of 113317.4 W is used to determine the force acting on the vehicle. However, the derived velocity of 11.336 m/s is significantly lower than expected for a car of this caliber, indicating a miscalculation in the force or other parameters. The discussion highlights the complexities of calculating maximum speed without complete data, particularly the cross-section area.
tomboi03
Messages
74
Reaction score
0
A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the drive train, and 70% reaches the wheels. The total mass of the car and driver is 1530 kg, and two-thirds of the weight is over the drive wheels.

okay... sooo...

I know that P = F(car)*velocity = m*g*v+1/4*A*v^3
where A is the cross-section area.
But this problem doesn't have a cross-section area given.

Since the maximum power output is 217 hp and 70% of the power reaches the drive wheels.
P= (217hp)(0.70) = 151.9 hp

151.9hp * 746W/hp = 113317.4 W
and i don't know where to go with this.
 
Physics news on Phys.org
tomboi03 said:
A Porsche 944 Turbo has a rated engine power of 217 hp. 30% of the power is lost in the drive train, and 70% reaches the wheels. The total mass of the car and driver is 1530 kg, and two-thirds of the weight is over the drive wheels.

151.9hp * 746W/hp = 113317.4 W
and i don't know where to go with this.

113317.4 W reaches the wheels.The total weight of the wheels = 2/3 * 1530 * 9.8
I reckon that should help you find the velocity.
 
okay uh... the thing is...

I know P=F*v right?
so, if P= 113317.4
and F= 9996

i get v= 11.336 m/s...
and that is not nearly enough for a porsche to reach it's max speed... it's like the min speed if anything.
 
nvm i got it! hahaha ;) thanks!
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
View full post »

Similar threads

What is the Maximum Speed of a Porsche 944 Turbo at Full Power?
Replies
1
Views
5K
Verify Answer- Porsche Power Question
Replies
4
Views
11K
Maximum acceleration of a Porsche on a concrete surface?
Replies
4
Views
5K
Sound Intensity and Power Calculations in a Conversation
Replies
20
Views
13K
Max power plant output w/o killing river smelt?
Replies
10
Views
3K
Exhaust and engine accoustics for asthetics and performance
Replies
2
Views
7K

Hot Threads

Recent Insights

Back
Top