I have a 85 Mazda Rx7 GSL-SE that I have been using for hillclimbs, but will be re-purposing for rallycross. I am about to tear into the LSD diff to rebuild it but do not know how tight I should set the brakeaway for rallycross. If I where still hillclimbing the car, I would shoot for 100 ft lbs. 50-60 is stock I am told. It seems to me at 100 ft lbs on dirt you would have mass understeer when you didn't have mass oversteer. Should I go with stock settings or less that stock... say 25-30 ft lbs? As it is right now, I have 6 ft lbs at brakeaway, but it still ends up spinnning both rears when launched even on slicks.
mw
Dork
5/13/13 6:43 p.m.
My guess is go with stock or a little stiffer. I don't think turn in will be hurt by those settings.
As a side note, I'm got the same diff in my dwarf car. Where are you getting your parts for rebuild?
Did you ask over at specialstage? In my real life dealings with rally guys I have talked to a bunch of former rx7 drivers. I would ask over there and see if I could find someone with actual experience.
mazdatrix sells rebuild parts http://www.mazdatrix.com/G8LSD.HTM
I would go higher than stock. Mine is set around 100 ft lbs or so (not in a rx7)
Mine is set to something ridiculous like 200+. I can't really check it, but it doesn't really break away.
EvanB's Miata turns in a lot nicer than my car.
In reply to mw: like DaveEstey said mazdatrix is who I will be using for a parts supplier, You can get the Factory Sevice Manul fron foxed.ca it will give you all the specs and step by step instructions
In reply to mazdeuce: Will definatly check out specialstage thanks Mazdeuce
Bear in mind that stage rally has much different priorities than rallycross. I tried using a stage rally like setup and the car was awful to drive on course. A good rallycross setup will end up being a lot more skittish but this just means that the car is more disposed to changing direction.
Also, if you're not a Mazdaspeed member, become one. The prices for diff rebuild parts (as well as everything else) are loads cheaper than Mazdatrix, or even dealer cost.
Thanks for the tips I just finished filling out the app over at mazdaspeed. , In reply to Knurled:
