danny11 Posted January 28, 2011 Share Posted January 28, 2011 My car has 7 speed forward automatic, it is amazing refine as the engine barely goes pass 2000 rpm and changes so smotth you barely it was changing gear, at 70mph cruising speed the engine is doing 1800 rpm and i get 50+ mpg from a big car Link to comment Share on other sites More sharing options...
Cyclone Posted January 28, 2011 Share Posted January 28, 2011 I suppose the most efficient (and astronomically expensive!) solution would be a car that is constantly changing the gear ratio as the speed changes - if such a thing were physically possible at all, that is. I wouldn't know, but I'm pretty sure that even if it is possible it would be hopelessly impractical on cost grounds. I've heard of cars with seven forward gears, but never before of one with 8. That would be a cvt or constantly variable transmission, they exist but aren't that popular for some reason. Link to comment Share on other sites More sharing options...
Cyclone Posted January 28, 2011 Share Posted January 28, 2011 Our 1.4 litre engined Vauxhall Meriva can reach over 50mph in second gear, if ever we were daft enough to want to do it. I don't suppose it has to be a monstrously powerful engine to reach 70mph in second. I don't think it's that unusual for any car with sports pretentions. Link to comment Share on other sites More sharing options...
Grandad.Malky Posted January 28, 2011 Share Posted January 28, 2011 What car has 8 forward gears? My current car has 6, purely for efficiency reasons as it can break the motorway speed limit in 2nd. I thought the idea was to alter the ratio of the other gears rather than give greater speed in the top gear. A close-ratio type of transmission is designed to allow an engine to remain in a relatively narrow operating speed. Alternately, a wide-ratio transmission requires the engine to operate over a greater speed range, but requires less shifting and allows a wider range of output speeds. Close-ratio transmissions are generally offered in sports cars, in which the engine is tuned for maximum power in a narrow range of operating speeds and the driver can be expected to enjoy shifting often to keep the engine in its power band. Link to comment Share on other sites More sharing options...
ASPGuru Posted January 28, 2011 Share Posted January 28, 2011 The latest model Range Rover has 8 forward gears (without considering high/low ratio) in an automatic gear box. Link to comment Share on other sites More sharing options...
SHYTOT Posted January 28, 2011 Share Posted January 28, 2011 In the early 1970s I drove a Plymouth Barracuda that would do 120 MPH in 2nd gear. Link to comment Share on other sites More sharing options...
Frank Sidney Posted January 28, 2011 Share Posted January 28, 2011 What car has 8 forward gears? My current car has 6, purely for efficiency reasons as it can break the motorway speed limit in 2nd. mm, sounds good, you'll have to take me for a spin some time... Link to comment Share on other sites More sharing options...
Cyclone Posted January 28, 2011 Share Posted January 28, 2011 I thought the idea was to alter the ratio of the other gears rather than give greater speed in the top gear. I suspect both unless you actually have a race box fitted. Most road cars, even sporty ones can expect to be driven for some distance at motorway speeds and be expected to achieve some measure of economy. I can't imagine that I'd get above 4th on a track very often. Something which I do intend to try so I'll let you know when I can verify that. Link to comment Share on other sites More sharing options...
Uptowngirl Posted January 28, 2011 Share Posted January 28, 2011 I suspect both unless you actually have a race box fitted. Most road cars, even sporty ones can expect to be driven for some distance at motorway speeds and be expected to achieve some measure of economy. I can't imagine that I'd get above 4th on a track very often. Something which I do intend to try so I'll let you know when I can verify that. Track day? Have you got rid of the hairdressers car? Link to comment Share on other sites More sharing options...
Cyclone Posted January 28, 2011 Share Posted January 28, 2011 Never had one. Link to comment Share on other sites More sharing options...
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