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Old 20th December 2012, 12:24   #46
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Default Re: 6th Gear for a car ! Need, Criteria, Advantages & Disadvantages

Originally Posted by Shan2nu View Post
The same theory holds true for petrols as well.

The OHC VTEC comes with a very tall 4.058:1 FD. If it had a 6th gear, honda could have used a 5.06:1 FD, so that the car can benefit from a shorter overall gearing for quick acceleration, while still maintaining a relatively low cruising rpm for better FE.

So a 6th gear is as important for a petrol, as it is for a diesel.

Let me rephrase that. A turbo diesel can make 'better' use of a 6th gear than a similar size engined Non turbo charged petrol can.

For example.

Swift Petrol vs Swift Diesel.

Swift Petrol is dead as a duck in 5th gear after 145 plus, hence a 6th gear would be of value only if rest of the gears are closely spaced.

Swift Diesel pulls like it was on rails from 85 in 5th gear to around 160 on the speedo after which the progress slows down till it touches 175 arounds.

Turbo kicks in at 2000 rpm in 5th gear at 85 kmph and at 120 kmph the car is ticking at 2900 rpm and after 3400 rpm arounds the torque starts tailing off.

A 6th gear which makes the turbo spool at 2000 rpm in 6th gear would make for an excellent cruiser on the highway, lowering the engine rpm's at 140 kmph or even 120 kmph for that matter with the engine being able to sustain that those speeds because of maximum torque of the DDIS kicking in at 2000 rpm.

Hence a 6th gear in a Swift diesel would not only improve kmpl but also impart it to be a better highway star.
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Old 20th December 2012, 14:17   #47
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Originally Posted by Ricky_63 View Post
You have said the right things, but I still feel the 6th gear would help to ride smooth & easy once over the 100 kmph mark.
I fully agree with you that it will be a boon once you cross 100 kph. :-)
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Old 22nd January 2016, 14:05   #48
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Default Re: 6th Gear for a car ! Need, Criteria, Advantages & Disadvantages

Absolutely love the 6th gear on my Lodgy. Renault has perfectly mated the gearbox to the K9K engine and this enables effortless cruising in 6th. By effortless, I mean the ability to speed up without downshifting when the need arises. From 90 kmph, I can engage 6th and any time I need to go higher, it's just a dab on the accelerator. Due to the low RPM, high speed cruising in 6th, it's easy to attain high speeds without realising it.

It's not just about high mileage but also the ability to keep the engine relaxed and right in the turbo zone for quick overtakes. Given the choice, I would pick a 6 speeder over a 5 speeder any day.
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