05-17-2009, 03:50 AM
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Sequential Gearbox
I was trawling YouTube and saw this clip....
What do you think of it?
(If the link doesn't work then someone who knows how to do it can re-post it.)
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05-17-2009, 01:18 PM
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Lightest 105 clutch/flywheel ever? Look like a specially machined item with integral ring gear to accept a tiny clutch pack. Pretty cool, but I imagine a biatch to drive in regular traffic.
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05-17-2009, 02:17 PM
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The picture of the internals shows a dog engagement (instead of synchromesh) gearset. Colotti made these, and Steve Schwitters makes these in the US using Hewland gears and the Alfa case but they are both still H pattern. Sequentials usually have a ratcheting drum to select gears and it would shift like a motorcycle (move lever up or down, not H).
with proper match rev, you don't need the clutch other than to get started as shown in the video. You can use a clutch as well. Great for the track and close ratio, fast shifts. Large RPM drops between shifts is more challenging.
I have no actual knowledge of what product is in this video, I am merely sharing experience and speculation.
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05-17-2009, 02:25 PM
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 Quote:
Originally Posted by andyb6
The picture of the internals shows a dog engagement (instead of synchromesh) gearset. Colotti made these, and Steve Schwitters makes these in the US using Hewland gears and the Alfa case but they are both still H pattern. Sequentials usually have a ratcheting drum to select gears and it would shift like a motorcycle (move lever up or down, not H).
with proper match rev, you don't need the clutch other than to get started as shown in the video. You can use a clutch as well. Great for the track and close ratio, fast shifts. Large RPM drops between shifts is more challenging.
I have no actual knowledge of what product is in this video, I am merely sharing experience and speculation.
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With some practice you can shift a traditional syncro box without a clutch pretty quickly. I'd advise not practicing this on a car with hard to find gearbox internals.
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05-17-2009, 02:47 PM
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05-17-2009, 04:33 PM
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How do you get away with running these things in historic races, as they are not "period" items?
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05-17-2009, 04:40 PM
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Oh my god, Wolfgang ...
I thought your car couldn't get any quicker!!
But now ?!!
Can't wait to see some tracktime video
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166 3.0 V6 24V - 1999
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05-17-2009, 04:53 PM
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Now THAT'S interesting. More details please, Wolfgang!
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05-17-2009, 06:22 PM
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Good question
Quote:
Originally Posted by dretceterini
How do you get away with running these things in historic races, as they are not "period" items?
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I am all for trick stuff in modern racing but this pursuit mystifies me in Historic racing.
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Bob
1965 RHD GTA Corsa Ex Horst Kwech 1966 Trans-Am and B-Sedan Champion
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05-17-2009, 08:05 PM
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Quote:
Originally Posted by CanAmBob
I am all for trick stuff in modern racing but this pursuit mystifies me in Historic racing.
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Just sad  . Rather see the cars motionless in museums than destroyed by people trying to do things that just shouldn't be done.
Pete
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'71 1750 Series 2 GTV: http://www.alfabb.com/bb/forums/showthread.php?p=208078
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05-17-2009, 08:40 PM
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Wolfgang,
What are you doing for the rear mount? are you modifying the transmission crossmember? Also, what are the ratios and what final drive are you running?
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Anthony Rimicci | 64 Giulia Spider | 65 GTA | 68 GT Jr.
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05-17-2009, 08:53 PM
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Quote:
Originally Posted by italcarguy
Wolfgang,
What are you doing for the rear mount? are you modifying the transmission crossmember? Also, what are the ratios and what final drive are you running?
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Some modern race cars are not that expensive and need bigger grids, that is where we should go if we feel the need for this sort of stuff .
Best
Pete
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ps: Remember it's all just opinions
'71 1750 Series 2 GTV: http://www.alfabb.com/bb/forums/showthread.php?p=208078
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05-17-2009, 09:34 PM
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Quote:
Originally Posted by PSk
Mate, please don't ruin your GTA with this mod, or ruin the concept of historic/classic racing by pursuing this very modern application.
Some modern race cars are not that expensive and need bigger grids, that is where we should go if we feel the need for this sort of stuff .
Best
Pete |
However, my GT Jr. already has a 2L and lots of other trick stuff so this would make it a little more interesting
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Anthony Rimicci | 64 Giulia Spider | 65 GTA | 68 GT Jr.
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05-17-2009, 10:25 PM
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Quote:
Originally Posted by italcarguy
However, my GT Jr. already has a 2L and lots of other trick stuff so this would make it a little more interesting |
I've heard that in the UK modern shock internals are being installed inside the old Koni shells to fool scrutineers ... on really important old single seaters. Just sad that somebodies ego is that delicate that they would resort to this sort of stuff..
Best
Pete
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'71 1750 Series 2 GTV: http://www.alfabb.com/bb/forums/showthread.php?p=208078
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05-18-2009, 01:49 PM
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Did my eyes deceive me or did the driver toe and heel on the down-shifts which would, I think, completely confuse a trick gearbox. I saw no drum selector either which is integral to a mechanical sequential box so can only assume he was driving by "ear".
By the way, Wolfgang, the box you have fitted to the GTA bell housing appears to be very small.....what is the method of gear selection and does the blue cable do it?
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Stuart
'56 Giulietta Spider, '57 Giulietta Spider Veloce, '57 Giulietta Lightweight Sprint Veloce, '60 SZ, '68 GTA, '76 2000 Spider
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