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Thread: Looking for WRC gear ratio data
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20th January 2009, 00:09 #1
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Looking for WRC gear ratio data
I am trying to collect any data on the gear ratios used in WRC cars. Any car, any year, any gearbox any event.
I'd really like to know what typical ratios are for the Impreza WRC S7 - S14 speed.
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20th January 2009, 03:10 #2
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Originally Posted by cougarrange
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20th January 2009, 03:12 #3
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they always change it depending on the road surface
=----------------
Full time four wheel drive. The front, center and center differentials are electronically controlled. 50%-50% F-R torque distribution.
Five speed Peugeot/X-Trac non synchronized, sequential shift gear box longitudinally mounted. Carbon triple plate clutch.
High ratio rack and pinion, power assisted steering.
Final drive ratio: varies depending on the surface
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25th January 2009, 10:44 #4
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gear ratios
if you buy the homologation books for each car you will get all the ratios and final drives
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25th January 2009, 11:07 #5Originally Posted by midgary“Don’t eat the yellow snow” Frank Zappa
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25th January 2009, 19:47 #6
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Originally Posted by OldF
Homologation papers that Sub-a-rat, or Ford or Opel or whoever prepares and submits where every specification of the basic car and all the fun bits that make it a rally car are detailed with dimensions, ever weights and the "Variant Options" are supplied in detail.
If they are talking about a final drive they will state the tooth count like 9:42 and the ratio of 4.67 or if its a connecting rod they list the length center center to center, the width, the weight etc., cylinder head port dimesnsions ---plus their tolerance of + and - this many tenths of a mm etc.
It's used in checking compliance---rememeber Tomi and somebody else getting disqualified for flywheels out of spec weight by a few grams or way back when Per Eklund had his excellent 3rd OA taken away on an RAC cause the original untouched as-cast intake manifold was 0,3mm "too large" even tho it is a sand cast part.
Homologation papers usually can be bought---for stupid money, maybe 65-150 dollars----from your National Federation like Svenska Bilsport Förbundet or
or OMK or RACMSA or equivalent.
Not so in USA where the organisers of the rival 'Champignonskit' are both private corporations and homologation is not a concern.John Vanlandingham
Sleezattle WA, USA
Vive le Prole-le-ralliat
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25th January 2009, 19:55 #7
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Ford Escort WRC
1... 15/27
2... 19/24
3... 22/21
4... 23/18
5... 24/16
6... 24/14
Reverse... 14/30
Final... 18/29, alternative 16/27Stupid is as stupid does. Forrest Gump
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26th January 2009, 01:05 #8
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Originally Posted by 'Mirek Fric [Cze
The final drive was very often 4.44:1 (Ford PN 9092448) I don't have the tooth counts,, wait........here it is 9:40
If you do the math none of the gearbox ratios make any sense unless multiplied by the ratios you have as "final drive" as none are more than 1.9:1 and 3rd thru 6th are crazy overdrive.
I believe you have posted a "drop gear" ratio which is the ratio from the inputshaft gear down to the bottom cluster gear.
Then 1st comes out about 2.88:1 and top about 0.94 or 0.96.John Vanlandingham
Sleezattle WA, USA
Vive le Prole-le-ralliat
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26th January 2009, 01:23 #9
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You're right, it's input ratio accoding to Escort WRC manual. Sorry
Stupid is as stupid does. Forrest Gump
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26th January 2009, 02:02 #10
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I have the homologation papers for Corolla WRC here.
They don't list the gear ratios other than the std ratios of the base car.
Lists all of the homologated final drives - 33 different ratios for the front (from 5.1 down to 2.6) yet only 6 for the rear.
Also lists the transfer case ratios.Never do anything you wouldn't want to explain to a paramedic.
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