Increasing top speed

Posted by Ken Sadler On 2012/3/27 2:04:47

Some advice please.....

I'm a bit concerned about getting an appropriate speed out of my 745. Obviously there's no rev-counter so I dont know what the engine speed is but I am reluctuant to take the car above 40 mph as it does seem to me that the engine is screaming at that speed.

The speedo reads about 5mph high (speed check camera local to me confirms my speed is 30mph when the speedo reads 35)

The thing is, with the speed of modern traffic I'd like to think I could travel at 50-55 mph (although the others near my home would prefer 90 -100 mph!!

Can anyone tell me what revs this engine would be doing at 40mph?

Is there a reasonably priced solution for a higher ratio differential or an overdrive or what?

Thanks chaps