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Location:
SOR, Perth
Registered:
October 2003
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Dog Box questions
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Fri, 14 November 2003 09:10
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Do Dog engagment gearboxes (straight cut) need the clutch to be used on every gearchange or is it only when shifting down?
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Location:
Adelaide
Registered:
June 2003
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Re: Dog Box questions
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Fri, 14 November 2003 09:31
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shifting down and taking off in 1st
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Dog Box questions
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Fri, 14 November 2003 10:24
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not all dog boxes are straight cut, but if you go to the effort of making a dog box, then you are probably looking for ten-tenths and need to reduce friction losses in the box.
to be honest you don't need to use the clutch for a normal gearbox, but it means that you don't need to rev match if you use the clutch.
with a race car, you have lightened engine bits, so the revs drop quickly, and as the dog bits are very strong, you can just shove the gear in.
if you do that with a normal box, you are more likely to break the teensy bits that match the gears speed....
a few bike buddies hardly ever use the clutch on their bikes except when stopping and starting off..
Cya, Stewart
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Location:
Brisbane
Registered:
October 2002
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Re: Dog Box questions
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Sat, 15 November 2003 23:53
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i've gotten lazy lately and am not using a clutch, a bit of getting used to and i can go up or down
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Location:
Newcastle
Registered:
August 2003
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Re: Dog Box questions
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Sun, 16 November 2003 01:26
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HOLD UP!!!!
let me get this right.... Yous aint using the clutch when changing gears? Like jamming it out and in wihtout using the pedal? WTF???? Doesnt is stuff it?? WHY?
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Location:
Brisbane
Registered:
July 2003
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Re: Dog Box questions
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Sun, 16 November 2003 01:41
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You don't actually need the clutch.
Say you do 3500 rpm at 60 in 3rd... You can pull it out of 4th without the clutch, take the revs up to 3500 and slot it straight into third as if it was a hot knife in butter.
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Location:
Brisbane
Registered:
July 2003
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Re: Dog Box questions
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Sun, 16 November 2003 01:41
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And I never use the clutch  Auto!
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Location:
Brisbane
Registered:
October 2002
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Re: Dog Box questions
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Sun, 16 November 2003 11:25
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u cant just slam it back and forth, it just wont work, u have to pull it out of gear, then give iut slight rev and it'll just nicely slot it, when u do got for the shift it may not go, just lightly let it off and try again, quickly tho, not 1 every 3 seconds, and keep tapping the throttle to alter the speed lightly, if u ram it home it'll crunch
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Location:
Brisbane
Registered:
May 2002
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Re: Dog Box questions
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Sun, 16 November 2003 13:31
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This sort of thing is hell on the synchros, unless you rev-match it PERFECTLY every single time, which is basically impossible. Synchro boxes just aren't designed for this sort of treatment!
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Location:
Montrose, VIC
Registered:
May 2002
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Re: Dog Box questions
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Mon, 17 November 2003 01:24
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No it's not good for boxes, but it's something you SHOULD be able to do if you've got a vague inkling of how to drive a car. Surprising how many people find it impossible to learn though 
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Location:
Brisbane
Registered:
October 2002
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Location:
Brisbane
Registered:
May 2002
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Re: Dog Box questions
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Mon, 17 November 2003 11:21
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Good thing you can pick up W40's for almost nothing. 
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Location:
Brisbane
Registered:
October 2002
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Re: Dog Box questions
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Mon, 17 November 2003 11:22
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| Norbie wrote on Mon, 17 November 2003 21:21 |
Good thing you can pick up W40's for almost nothing.
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damn straight
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I supported Toymods
Location:
Oyster bay NSW
Registered:
May 2002
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Re: Dog Box questions
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Mon, 17 November 2003 11:43
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I got to get through 10 gears each time I have to take off in Kenworth truck, only use the clutch twice, to put it in first and to take it up or down range on the splitter box.
Most times I am lazy and don't use the clutch in the car either.
Just let the engine rev drop back it self on the up shift by taking a 1 sec or so to shift it, and give it a little rev on the down shift.
Once you have done a few times it comes natural
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