when you're driving your S2000 do or don't
11-02-2007, 04:01 AM
#21
I don't think I ever get out of 3rd gear until I'm over 50mph, and I only use 6th when cruising at 80+ on highways with not much traffic.
I do skip from 1st to 3rd when the car is cold and I can tell it's not going into 2nd properly. That's more of a winter thing, and with the morning temps in the 40s, I'm starting to do it at least once within my first couple of miles in the morning.
I do skip from 1st to 3rd when the car is cold and I can tell it's not going into 2nd properly. That's more of a winter thing, and with the morning temps in the 40s, I'm starting to do it at least once within my first couple of miles in the morning.
11-02-2007, 08:59 AM
#23
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There appears to be much misunderstanding of how a manual gearbox works mechanically and what is actually happening when you skip shift.
When a transmission is in gear, the rotational speeds of the layshaft (connected to the input shaft) and output shaft is related by the ratio of the gear set selected. When going to the next gear, either shaft needs to slow down or speed up to match the ratio of the next gearset before engaging them. This change in shaft speed is done by the syncros using friction which is derived from the force you use to manipulate the gear selector. When skipping gears the difference in required shaft speed is greater and the shafts needs to speed up or slow down more than when selecting the gears sequentially so the syncros have to work much harder and wear out faster.
Yes, the gearbox will physically allow you to skip gears, but your syncros wear faster. When the syncros wear, it cannot adjust the shaft speed to match and the "crunch" you hear are the gear dogs skipping and slamming against each other instead of mating.
The good news is that the syncro materials are so good these days that a typical gearbox survives despite this ill-practice.
Hear is the official word from Honda about Skip-shifting.
http://www.in.honda.com/Rjanisis/pubs/SN/A060100.PDF
When a transmission is in gear, the rotational speeds of the layshaft (connected to the input shaft) and output shaft is related by the ratio of the gear set selected. When going to the next gear, either shaft needs to slow down or speed up to match the ratio of the next gearset before engaging them. This change in shaft speed is done by the syncros using friction which is derived from the force you use to manipulate the gear selector. When skipping gears the difference in required shaft speed is greater and the shafts needs to speed up or slow down more than when selecting the gears sequentially so the syncros have to work much harder and wear out faster.
Yes, the gearbox will physically allow you to skip gears, but your syncros wear faster. When the syncros wear, it cannot adjust the shaft speed to match and the "crunch" you hear are the gear dogs skipping and slamming against each other instead of mating.
The good news is that the syncro materials are so good these days that a typical gearbox survives despite this ill-practice.
Hear is the official word from Honda about Skip-shifting.
http://www.in.honda.com/Rjanisis/pubs/SN/A060100.PDF
11-02-2007, 09:10 AM
#24
Registered User
ok, there it is in honda print. i do it, i have always done it, never had a gearbox go bad yet, or syncro issue. do it carefully, ease the lever, never force it. i do it every day with all my cars...your mileage may differ.
11-03-2007, 09:08 PM
#25
I go through the gears.
12-14-2019, 03:18 AM
#30
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Mr
I have never deliberately skipped gears while upshifting but frequently do so from 4 to 2 while downshifting . I always double declutch when down shifting and can say that 4 to 2 is absolutely smooth.
Upshiifting from 1 to 2 used to be really rough but since l have started changing only at minimum 4000 rpm and being decisive l need only flick my fingers to effect the shift. Using finger pressure only minimises the chance of any damage. NB, the clutch must be totally disengaged before shifting though and the gearbox must be warm