Diff ratio for Bathurst
Posted 22 December 2013 - 08:13 PM
We see about 200 in rally trim but there's no Conrod straight in a rally so not sure what we need to prepare for.
I know some of you guys have run there before so any advice appreciated.
Posted 22 December 2013 - 08:20 PM
Whilst speed down Conrod is important you can't forget about the big climb up mountain straight and even worse the 1 in 8 climb out of the cutting which is 2nd gear low revs and pull from there up to Reid Park and then onto Macphillamy.
A big trap for young players is to worry about Conrod and forget about the climb up the hill.
I would take a 3.9 and a 4.1 and go with the 4.1 first and if to short drop to the 3.9.
Posted 23 December 2013 - 12:23 AM
On GearCalc program thats 245 down Conrod, but the 4.1 gives pretty good climb up the hill.
3.9 or less gets a bit boggy
Posted 23 December 2013 - 07:57 AM
Posted 23 December 2013 - 10:15 AM
I am stuck with a 3.6 diff in my car so the climb up through the cutting is very interesting, should be better this time then at my last visit when I was running a 3 speed auto as I now have a manual box fitted.
Check out this video taken at this event in 2013, you will see that the driver actually selects first gear to pull up out of the cutting, and he averages lap times just on or under the 3 minutes.
May see you there.
Posted 23 December 2013 - 10:46 AM
If I could crack a 3 min lap I'd be thrilled, happy to just lap up the experience and bring it home in one piece.
See you there.
Posted 23 December 2013 - 06:58 PM
Posted 23 December 2013 - 07:37 PM
That was in a Historic category Group S car, very unmodified and poor aero, and 6" rims.
compared to the majority of sprints entered S30 Zeds, running triples, 8" rims, low profile sticky rubber etc
Posted 02 January 2014 - 01:19 AM
Great to hear you're off to Bathurst at Easter, you're in for a great time.
My son and I have taken the Zed there twice (double entered), we usually run a 4.11 ratio but for our first Bathurst run we fitted a 3.5 to allow for the run down the hill which was fine but we lost out enormously going up and it didn't really work across the top so for our second attempt we fitted a 3.9 which was perfect, it left us with enough power up the hill, worked well across the top and didn't overwork the motor on the way down.
I was happy with my times but unfortunately for me my son was even happier with his best of 2.55.3, while the car is not group s spec but was on 6" rubber, for you to get an idea of how your car will rev with a 3.9 ratio diff I've attached a link to his hot lap.
Hope this helps in your decision making.
Posted 02 January 2014 - 06:52 PM
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