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Old 28 Jul 2005, 13:11 (Ref:1365562)   #16
1200Datto27
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1200Datto27 has a lot of promise if they can keep it on the circuit!
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Originally Posted by johnh875
Heeltoe the word you are looking for is "billycart"

After reading the article it is not like the system I thought of earlier.

I wonder what the shift time of the Holinger gearboxes used in V8 Supercars would be, on upshifts they don't use the clutch or lift their right foot from the firewall, they just bang it through - I wouldn't be surprised if what happens inside the gearbox is essentially the same as the Zeroshift mechanism really.
The Holinger H6 gearboxes are quite slow in comparison to the quickshifts, with shift times limited to the speed of the driver (around .6 ~ .7 of a second for a good in plane shift) and how hard he's pushing it. They use a spark cut mechanism as well, that allows for the flat shift to be done, with out over reving the engine.
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Old 30 Jul 2005, 07:56 (Ref:1367080)   #17
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R59 should be qualifying in the top 10 on the gridR59 should be qualifying in the top 10 on the grid
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Originally Posted by THR
gunna add say wot 1sec to a 0-60 in a 1.2 litre hatchback??? for free nearly?!!
I'm sure you meant take off, rather than add.

So that would bring back the 0-60 time to standard after fitting sixteen 1000W amplifiers, 20 speakers that weigh 2Kg each, a mahousive wide arch kit, stupid Lexus style rear lights, and some silly shiny wheels with things that spin in the middle to show off standard 1.2 brakes. Yep. A barry if I ever saw one!

In fact, nope, you wouldn't fit one, you'd spend that 5000 on more stereo equipment, bigger wheels, and more junk inside the car to slow it down further.

Or am I being cynical?

Yes, I like this zeroshift idea. Can it handle 600lb/ft of torque?
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Old 30 Jul 2005, 09:08 (Ref:1367120)   #18
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1200Datto27 has a lot of promise if they can keep it on the circuit!
Those diesel marine engines would be putting out more than that I would hazard to say. Same as with the stadium/off road machines.
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Old 30 Jul 2005, 15:37 (Ref:1367496)   #19
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hmm, I think this gearbox would be loved by the drifters.
mid-drift gear changes, mmm...

and when you are racing/not drifting, just use the clutch,
then you wont get that massive jolt during gearchanges and it is still faster than conventional boxes !

but I dont like those "automatic" versions
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Old 5 Aug 2005, 19:26 (Ref:1373204)   #20
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I read about Zero Shift in Racecar Engineering a month or so back. Pretty ingenious really but my main concern is the durability of the whole thing. It should be reliable enough for racing but for production cars - I dont think so.

You don't find any production cars with dog boxes because the dogs wear quite rapidly (you only have to look inside a Hewland box after only a few races to see this), the Zero Shift will suffer from this same wear issue. Motorbike do however have dog boxes but the life expectancy of a bike engine/gearbox is typically only 30-40k miles. This is way short of the 200k+ a car manufacturer would require.
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Old 6 Aug 2005, 08:59 (Ref:1373614)   #21
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From what I understood in 'Racecar', the dogs on the Zeroshift are in pairs, only one of which is loaded at any time. The unloaded dog is disengaged from one gear and engaged in the next while there is no load on it - it is just gently slid from one position to the other with no side load as the load is carried by the other dog. Only once in the new position is the load switched over to the newly positioned dog, as the previously engaged dog is slid out while the torque from the engine is 'momentarily' removed. So it too has no side load at the time of being disengaged. Because of this I imagine that wear would be significantly less than on a dog box, where the dogs are crunched into position very crudely whilst under load (if you are not using the clutch). In fact, they used to be called 'crash' gearboxes, didn't they?
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Old 7 Aug 2005, 22:06 (Ref:1374528)   #22
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I dont think the zeroshift will suffer from wear.
actually, I think it would be slightly superior to the ubiquitious sync boxes we now have due to:
less wear; no brass against steel braking of high velocity heavy cogwheels.
and less parts; the sync rings is rendered osbolete

and as a bonus we can do super quick mid-drift shifts without the tires gaining grip as we depress the clutch
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Old 22 Sep 2005, 09:36 (Ref:1413751)   #23
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but how is the shock, when jumping gears, negated?

i mean, when 2nd overruns 1st there has to be a sudden change in speed . what do they do abt this?
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Old 22 Sep 2005, 09:46 (Ref:1413758)   #24
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Quote:
Originally Posted by effuno
but how is the shock, when jumping gears, negated?

i mean, when 2nd overruns 1st there has to be a sudden change in speed . what do they do abt this?
In the Racecar Engineering article they describe a number of methods to dissipate the shock. They include:
  • Briefly slipping a clutch
  • Cutting fuel or spark to the engine
  • Installing dampers on the driveshaft

The engine torque is cut briefly but the intertia existant in the system keeps the acceleration going for this short period. They state in the article that a spike in torque is easier to smooth than a gap in torque is to fill.
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Old 5 Oct 2005, 18:13 (Ref:1424617)   #25
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Originally Posted by Heeltoe
hmm, I think this gearbox would be loved by the drifters.
mid-drift gear changes, mmm...

and when you are racing/not drifting, just use the clutch,
then you wont get that massive jolt during gearchanges and it is still faster than conventional boxes !

but I dont like those "automatic" versions
In drifting though you still use the clutch on a regular basis, called clutch kicking, useful in underpowered cars, such as the AE86. Mid-drift shifting isn't that hard, it's not like I have to go down four gears, usually just switching one, MAYBE two. A paddle shift as seen in a WRC car, would be the trickest bit you could put on.
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