Sequential shift gear box!!??
Im posing this question to people that may have more technical insight than myself. Why haven't any of the hi perforce car manufactures installed a sequential gear box? I know If there were something like that on the market it would catch my eye! They are used in rally cars and motorcycles with great success. They shift faster than the typical H pattern type shifters. I have wondered this for a really long time... Everyone is always taking dual clutch PDK SMG or what ever BMW is using now. Im talking 3 pedals not some computer operated clutch deal... A regular manual transmission only difference being it's a sequential shift instead of H.
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The mechanism required for sequential shifting probably lacks the long term reliability and ease of use manufacturers want for a production car.
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And they are noisy and clanky and expensive. I think they would be fun though.
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Originally Posted by 96ss#80
(Post 1588192581)
Im posing this question to people that may have more technical insight than myself. Why haven't any of the hi perforce car manufactures installed a sequential gear box? I know If there were something like that on the market it would catch my eye! They are used in rally cars and motorcycles with great success. They shift faster than the typical H pattern type shifters. I have wondered this for a really long time... Everyone is always taking dual clutch PDK SMG or what ever BMW is using now. Im talking 3 pedals not some computer operated clutch deal... A regular manual transmission only difference being it's a sequential shift instead of H.
Racings another story; closely spaced gears for a peaky torque engine, but the straight cut spur gears would make a radio useless! |
Originally Posted by 96ss#80
(Post 1588192581)
Im posing this question to people that may have more technical insight than myself. Why haven't any of the hi perforce car manufactures installed a sequential gear box? I know If there were something like that on the market it would catch my eye! They are used in rally cars and motorcycles with great success. They shift faster than the typical H pattern type shifters. I have wondered this for a really long time... Everyone is always taking dual clutch PDK SMG or what ever BMW is using now. Im talking 3 pedals not some computer operated clutch deal... A regular manual transmission only difference being it's a sequential shift instead of H.
Minus the clutch, of course. |
Originally Posted by Curahee
(Post 1588195704)
Isn't the A6/A8 tranny essentially a sequential box when in manual mode?
Minus the clutch, of course. |
Also, there's no torque converter in a sequential shift transmission.
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Ferrari, BMW and Aston have all had SMG transmissions in their cars and every one of them were great on the track and horrible on the street. Granted, they were automanuals with computer controlled clutches but regardless they were not ideal for road use.
The C7.R uses a sequential box with paddle shifters and a clutch. Again, great for the track, not so good on the road. The $10k+ price tag doesn't help. |
Probably because a good one, like the Hollinger (I got to experience one of those in a C6 Z once, pretty amazing) cost like 35k. Plus the maintenance.
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I have long wondered why a sequential box can't be done in a car. Motorcycle shifters are essentially a sequential shifter and you can buy an entire motorcycle for what you would pay for just the sequential gear box for a car. If skipping gears is that important, declutch, shift a couple of gears, then let the clutch out.
It would make missed shifts more of a rarity and blown engines from selecting a lower gear than intended almost an impossibility. |
http://www.s1sequential.com/
The bolt on sequential shift conversion changes the standard H pattern gear box to sequential action allowing you to simply push forwards for a down shift and pull back for up-shifts eliminating the chance of missing the 2-3 and 4-5 shifts . This conversion simply bolts on there is no need to machine of change any internal parts of the gearbox . The unit has been specifically designed to work with a syncro gearbox ( but will work just as well with dog gear conversions ) and does not need any form of electric assistance to get the job done there for it is still the driver 100% in control and getting all of the feel of the shift through the lever . This was an important part of the design as I think most owners choose the manual gearbox for that feeling of being in total control of the car . Gear selection is simple as pull back to change up gears push forwards to change down , neutral is half way between all gears like normal and reverse is selected by putting the gearbox in neutral pulling the lever then pushing the lever forwards to engage the gear . |
Originally Posted by mittens
(Post 1588727970)
http://www.s1sequential.com/
The bolt on sequential shift conversion changes the standard H pattern gear box to sequential action allowing you to simply push forwards for a down shift and pull back for up-shifts eliminating the chance of missing the 2-3 and 4-5 shifts . This conversion simply bolts on there is no need to machine of change any internal parts of the gearbox . The unit has been specifically designed to work with a syncro gearbox ( but will work just as well with dog gear conversions ) and does not need any form of electric assistance to get the job done there for it is still the driver 100% in control and getting all of the feel of the shift through the lever . This was an important part of the design as I think most owners choose the manual gearbox for that feeling of being in total control of the car . Gear selection is simple as pull back to change up gears push forwards to change down , neutral is half way between all gears like normal and reverse is selected by putting the gearbox in neutral pulling the lever then pushing the lever forwards to engage the gear . |
Originally Posted by canyon vette
(Post 1588728319)
This shifter still requires the use of the clutch. No real benefit in gear change speed if you're left foot is still involved.:thumbs:
Sure there is a benefit. With a sequential you move the shifter an inch or less each time as opposed to the 4-5 inches for an H pattern. This is if the shifter itself acts like the one in a Hollinger. |
But that would kill off the CAGS! :leaving:
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Originally Posted by Curahee
(Post 1588195704)
Isn't the A6/A8 tranny essentially a sequential box when in manual mode?
Minus the clutch, of course. |
Originally Posted by redzone
(Post 1588731879)
Sure there is a benefit. With a sequential you move the shifter an inch or less each time as opposed to the 4-5 inches for an H pattern.
This is if the shifter itself acts like the one in a Hollinger. Sequential and dog ring gear boxes are faster at shifting and a great benefit in racing, because they don't require race driver to cordenate hand and foot movements by removing the need for clutch depression and the extra time it takes. So there is no real benefit at all with street car's.:thumbs: |
I had read I guess it's been 5-10 years ago the BMW M3 had the sequential transmission.
I understand they don't have it now.I guess people didn't like it.I'd sure like to give it A try. |
True sequential boxes are great for racing with clutch less up and down shifts. However on the road they are utterly ****! Clunky and difficult to operate at light engine loads and when not hammered home. Even the electronic sequential boxes, see mark 1 Aston Martin vantage, are crap and they have propped torque management throughout the shift.
DSG style dual clutch boxes offer all the benefits of a sequential with the smoothness that the sequential a just could never have. They are astonishing and I hope GM get on the bandwagon and soon!!!! |
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