Max Speed of a Porsche 944 Turbo - 113317.4 W

  • Thread starter Thread starter tomboi03
  • Start date Start date
  • Tags Tags
    Max Speed
Click For Summary

Homework Help Overview

The discussion revolves around calculating the maximum speed of a Porsche 944 Turbo based on its engine power, drivetrain losses, and vehicle weight. Participants are exploring the relationship between power, force, and velocity in the context of automotive physics.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to apply the power equation P = F * v and are questioning the absence of the cross-section area in their calculations. They are also discussing how to calculate the force based on the weight distribution of the vehicle.

Discussion Status

Some participants have provided calculations related to power output and force, while others express uncertainty about the resulting velocity. There is an indication of progress as one participant claims to have resolved their confusion, although the specifics of that resolution are not detailed.

Contextual Notes

There is a noted absence of the cross-section area, which is crucial for a complete analysis of aerodynamic drag. Additionally, participants are working within the constraints of the problem as posed, without external references or additional data.

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!
 

Similar threads

What is the Maximum Speed of a Porsche 944 Turbo at Full Power?
  • · Replies 1 ·
Replies
1
Views
6K
Verify Answer- Porsche Power Question
  • · Replies 4 ·
Replies
4
Views
11K
Maximum acceleration of a Porsche on a concrete surface?
  • · Replies 4 ·
Replies
4
Views
5K
Sound Intensity and Power Calculations in a Conversation
  • · Replies 20 ·
Replies
20
Views
14K
Max power plant output w/o killing river smelt?
  • · Replies 10 ·
Replies
10
Views
3K
Exhaust and engine accoustics for asthetics and performance
  • · Replies 2 ·
Replies
2
Views
8K