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MG MGF Technical - Performance

Does anyone know what the weight in lbs is for a 98 MPI MGF?
What is the torque in lbs/ft?
Peter Burgess Website - using this information one can workout top speed and acceleration.


Have a look at

This should give you what you want, but you have to do a bit of metric/imperial converting!!!

Billy Bob

Thanks Billy Bob.

You really need the kerb weight of the car with driver, fuel etc - this is usually significantly higher than that given in manufacturers literature.
You also need the torque at the wheels - this is going to be less than that given (usually quoted at the flywheel)

Of couse, if you put your car on a rolling road, and/or a weighbridge you'll have some of the data. The easiest figure to get is the acceleration


Steve is right. You do need to factor in these differences.

When I did the calulation I got a 0-60 of just over 7 secs. For a standard MPi (except for the K&N).... I don't think so.... :)
Billy Bob

What value of bhp increase did you give for the K&N?


I gave mine a conservative estimate of 3bhp. I know some will say it can give 5+bhp but unless I get it on a rolling road I can't be sure
Billy Bob

Doesn't air drag become important for calculating top speed?
David Bainbridge

Air drag I think would be a factor even in calculating acceleration figures, however that's for someone more intelligent than me to figure out. I can't remember any of my A-Level physics!!!!
Billy Bob

Air drag and tyre loss.

Also the shape of the power/speed and torque/speed curve

Sounds like too many factors for an easy calculation.


I'd guess that the calculation is something like solving the following for velocity, as at maximum speed there is no acceleration:

force exerted on road by tyres = friction forces acting on car

Working out what those terms actually are is, of course, the difficult bit. I seem to recall that air drag increases as the square of velocity, which is why it is disproportionately more important at high speed. I'd suspect that tyre friction is linear, but not sure.

I seem to remember someone saying that the Cd of the MGF is pretty low - more aerodynamic than an Elise, for example. I think the most aerodynamic production car ever built was in the 1930's - a bizarre kind of teardrop shaped thing. And I don't think it's just the general shape of the car that's important - seams and protruberances increase drag quite considerably.
David Bainbridge

This thread was discussed between 13/08/2002 and 14/08/2002

MG MGF Technical index

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