FAZ
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Registered: 24th Nov 07
Location: Coventry
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f13 f15 f20 f28
what different about each etc?
whats on my '99 x12xe?
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jibjob
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Registered: 6th Apr 08
Location: Elworth, Cheshire
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F13 F15 are small block, F16 F20 are 2.0 and the F28 is 4wd iirc.
The differences are the ratios. Meaning one gearbox will be set up for quick acceleration but low top speed and the other gearbox will be the other way round - slower acceleration but higher top speed. Then you can also get close and wide ratios in each box so you can get F13cr and F13wr.
More than likely your gearbox will be an F13.
I think what i've said is right 
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Mertin
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Registered: 12th Oct 05
Location: Scotland
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F28 is a 6 speed. Isnt the numbers related to the torque rating?
My 97 1.2 had an F13CR
If you look on top of the gearbox then it should be stamped on it although some aren't for some reason
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Ian
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Registered: 28th Aug 99
Location: Liverpool
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Number is the torque rating.
There are generally numerous variations of each box and you need to dig a bit deeper to see what ratios and final drive will be installed, based on the car, original engine and a few other factors.
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Mike
Organiser: North West and North Wales
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Registered: 20th May 06
Location: nr. Skipton, North Yorkshire
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I believe the one that comes on an X12 is the F13cr, although I've never actually bothered to check
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Terry12
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Registered: 24th Sep 07
Location: Manchester
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Probably of no relevance but the f17 in my vectra has the f17 stamped on the side of the gearbox by the input shaft cover plate. I looked for ages on the top by the selector.
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oceansoul
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Registered: 19th Jun 06
Location: Sunbury, Surrey
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F means FWD.
In the Omega (and senator/carlton etc) is the R25 or R35. Then there are the AR25 and AR35, the A meaning Auto 
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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Why does the 4WD F28 have an F then? Genuine question by the way.
[Edited on 07-01-2011 by alan-g-w]
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scottyp1989
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Registered: 29th Jul 07
Location: Warley, West Midlands
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quote:
Originally posted by alan-g-w
Why does the 4WD F28 have an F then? Genuine question by the way.
[Edited on 07-01-2011 by alan-g-w]
because its still front wheel drive aswell
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oceansoul
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Registered: 19th Jun 06
Location: Sunbury, Surrey
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I'd imagine because its a FWD style design (if u know what i mean) as opposed to fitting to a longitude engine.
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alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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Good point oceansoul.
scotty, fair enough but if they've got different ones for FWD and RWD you'd expect them to have a different one for AWD.
[Edited on 07-01-2011 by alan-g-w]
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oceansoul
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Registered: 19th Jun 06
Location: Sunbury, Surrey
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Wonder what gearbox the Frontera use then? Vaux/Opel or Izuzu?
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AlexW
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Registered: 25th Oct 08
Location: Essex
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Unless 8v all corsa's came with CR boxes.
CR meaning close ratio, WR meaning wide ratio (Basically, short and long).
You can get CR and WR boxes of each (So F13CR, F13WR).
For instance, a F13CR will top out at 130mph with 15inch wheels and a 6500 rev limit, whereas a F13WR will top out at 145mph (iirc!) if you have the power to get there (doubt it).
But because a F13 tops out higher, your revs at 70mph are lower.
You also get different ratio final drives, Which affect the speed too. A 3.74 (most common in corsa's) give it a fairly quick acceleration, while a 4.53 (Rare anyway!) gives a slower acceleration but faster top end etc. The best final drive (And thus expensive) is a 4.18 which is bang in the middle and gives you good acceleration but also keeps the top end reasonable.
That help? lol
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ianofbhills
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Registered: 10th Feb 01
Location: newcastle
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quote:
Originally posted by AW06
You also get different ratio final drives, Which affect the speed too. A 3.74 (most common in corsa's) give it a fairly quick acceleration, while a 4.53 (Rare anyway!) gives a slower acceleration but faster top end etc. The best final drive (And thus expensive) is a 4.18 which is bang in the middle and gives you good acceleration but also keeps the top end reasonable.
That help? lol
Wrong way round a 4.53 final drive gives the best acceleration but sacrifices top speed.(hits rev limiter)
A 3.74 will give a higher top speed (if you have the power to get it there) but wont accelerate as quickly.
Its worked out as a ratio of the crownwheel and pinion final drive.
So on a 4.53 every revolution the crownwheel on the diff turns the pinion on the gearbox shaft will have turned 4.53 times. 4.53:1
so at 70mph a car with a 4.53 fd ratio will be at a higher engine rpm then an identical car with 3.74 fd ratio
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Scotty C
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Registered: 6th Nov 05
Location: Kidderminster Drives: 1.6 16v Sport
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What about Astra VXR gearboxes then? They're FWD but the gearboxes are like M32 aren't they?
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ianofbhills
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Registered: 10th Feb 01
Location: newcastle
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M stands for More then likely to break.
Dont know good question??????
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