Ford RS Cosworths

Erm, Simon and Jelly you are both Wrong! The Top speed can be effected by many aspects due to weight, mainly rolling resistence of tyres, which if you ask any race engineer, depreciates top speed! now we are not talking a lot but to say it has no effect is wrong [as this post has a lot of people using a lot of facts;)]
 
Thats assuming you dont have significant aero lift at higher speed where the close to irrelavent rolling resistance becomes even more insignificant. Also the higher speed of the tyre means the centripedal tyre forces resist sidewall deflection better, and thats where your going to lose energy.

1/2.ro.V^2.A.Cd, familarise.
 
well if weight is no issue, then why when my transit van is empty does it top out at 95[ish] mph but stick a couple of pallets on the back and its more like 80? [and no its nowt to do with acceleration as the engine is still running at the same speed]
 
robbi187 said:
Erm, Simon and Jelly you are both Wrong! The Top speed can be effected by many aspects due to weight, mainly rolling resistence of tyres, which if you ask any race engineer, depreciates top speed! now we are not talking a lot but to say it has no effect is wrong [as this post has a lot of people using a lot of facts;)]
Click to expand...


Most road cars produce lift anyway if you wanna get anal ;)
 
robbi187 said:
well if weight is no issue, then why when my transit van is empty does it top out at 95[ish] mph but stick a couple of pallets on the back and its more like 80? [and no its nowt to do with acceleration as the engine is still running at the same speed]
Click to expand...


So putting pallets in the back changed the gear ratio?

Awesome
 
robbi187 said:
well if weight is no issue, then why when my transit van is empty does it top out at 95[ish] mph but stick a couple of pallets on the back and its more like 80? [and no its nowt to do with acceleration as the engine is still running at the same speed]
Click to expand...

As Simon said; at a set rpm in a given gear, the wheels are rotating at a set rpm.

In order to lose 15mph, your tyres must be shrinking at speed...Which is impossible.

*n
 
Just had a thought; putting a load in a transit will make it sit lower which will slightly lower the CoD, negating any effects of increased rolling resistance...

*n
 
It would lower the frontal area rather than Cd but yeah same effect.

I imagine transit will get to 95 eventually, just takes longer and any slopes will have a greater effect on the vehicle speed.
 
penski said:
Completely inferior to a Kadett C/Chevette ;)

*n
Click to expand...

Wrong. There is a good reason why the mk2 is still well known as the world's favourite racecar. ;)

But they are going missing in massive numbers at the mo. One guy last week had the tiles removed from his garage so the thieves could climb through and get to the car.
 
bigchez said:
Wrong. There is a good reason why the mk2 is still well known as the world's favourite racecar. ;)
Click to expand...

Don't get me wrong. They are supremely capable cars if you spend a fortune on them...

But from the factory, they get their arses kicked at everything other than 'having a Ford badge' by the T-car platform.

Macstruts versus twin wishbones.

Leaves versus coils.

No competition tbh. Especially if the T-car is a saloon, coupe or estate.

The Kadett even came as an RS2000-beater in GT/E guise.

*n
 
penski said:
Just had a thought; putting a load in a transit will make it sit lower which will slightly lower the CoD, negating any effects of increased rolling resistance...

*n
Click to expand...


Either that or he is running 120 profile tyres with 5psi of air :D
 
You must log in or register to reply here.
Back
Top Bottom