Need help in calculating high speed run potential...

95mustanggt · 06-06-2001, 01:11 PM

As a relitively educated person, (BSc. Engineering) I will tell you that buddy is on crack.

At high speeds his "weight advantage" will mean nothing. There are 2 things that will limit his top speed.

1. Maximum Engine speed in top gear. This can be calculated from the gear ratios, engine RPM and tire diameter.

2. Wind resistance. Consider the Porsche 911 has a top speed of 174 mph and has 300 HP. Ignoring the HP advantage I'm pretty sure that the areodynamics of the Porshe are far superior to that of the CRX. The sudden "drop" at the rear of the CRX creates severe "pull back" pressure and will actually create a force that will act towards the rear of the car. Then there is the drag friction. The frontal friction will yet to add to the overall forces against the cars forward speed.

Remember you have 3 basic friction forces acting at the same time each incresing non-linearly with the speed. So you have 3 non-linear forces acting at the same time, giving yet an even more complex (and larger) non-linear resistance to movement. And there is still the matter of road friction etc. yet to enter the calculation!

Technically speaking, it is impossible for this guy to hit 175mph.

Get ready to make your $100 (or $65 US

)

The fastest I've ever had my stang to was 220-225 km/hr. In 4th gear, and yeah i had a little more room but not much. 5th gear is an overdrive and is too steep to contribute (atleast in my car).

------------------
Driving: 1998 F-150
Far way in Edmonton==>

1995 Mustang GT

[This message has been edited by 95mustanggt (edited 06-06-2001).]

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06-06-2001, 01:11 PM	#1
95mustanggt Registered Member Join Date: May 2000 Location: Kamloops, BC Posts: 2,875	As a relitively educated person, (BSc. Engineering) I will tell you that buddy is on crack. At high speeds his "weight advantage" will mean nothing. There are 2 things that will limit his top speed. 1. Maximum Engine speed in top gear. This can be calculated from the gear ratios, engine RPM and tire diameter. 2. Wind resistance. Consider the Porsche 911 has a top speed of 174 mph and has 300 HP. Ignoring the HP advantage I'm pretty sure that the areodynamics of the Porshe are far superior to that of the CRX. The sudden "drop" at the rear of the CRX creates severe "pull back" pressure and will actually create a force that will act towards the rear of the car. Then there is the drag friction. The frontal friction will yet to add to the overall forces against the cars forward speed. Remember you have 3 basic friction forces acting at the same time each incresing non-linearly with the speed. So you have 3 non-linear forces acting at the same time, giving yet an even more complex (and larger) non-linear resistance to movement. And there is still the matter of road friction etc. yet to enter the calculation! Technically speaking, it is impossible for this guy to hit 175mph. Get ready to make your $100 (or $65 US ) The fastest I've ever had my stang to was 220-225 km/hr. In 4th gear, and yeah i had a little more room but not much. 5th gear is an overdrive and is too steep to contribute (atleast in my car). ------------------ Driving: 1998 F-150 Far way in Edmonton==> 1995 Mustang GT [This message has been edited by 95mustanggt (edited 06-06-2001).]