First BRZ Performance Mod?

[euroshark]

more than likely i will gut a good portion out of it.

[Skywaffle]

What about doing anything like altering the final drive ratio? Granted, it would be at the expense of lower top speed. But that's always been a good way to squeeze a little better acceleration out of any car. I am also curious how well the stock limited slip differential will be compared to the aftermarket. I know on other cars, people would talk about upgrading to the Quaife limited slip differentials because the stocks weren't as good, although I never have experienced the difference myself.

[2_slo]

IMHO you will never find a better differential than the torsen for driving control and grip. Obviously, if you intend on drifting the car a 2 way clutch type diff would probably be the way to go. I suppose if you start pushing a lot more power through it the stock one may not hold the power, but as for the type of diff. I'd say TORSEN all the way! As for that final drive thing, I cant imagine that a new ring and pinion would be the easiest to come by. A 4.10 is a pretty steep final drive anyhow.

[Skywaffle]

Interesting. There is a lot I am unfamiliar with. I used to read a lot about all the different differentials when I had my 350z (the factory setup was a viscous coupling), but when considering the cost of upgrading, it seemed better to try putting the money towards something else. Granted, with more horsepower, I could see something stronger being necessary.

You're correct about the final drive being pretty short from the factory. Although I had read about people with similar car types (S2000 and Miata) being able to go higher (from 4.3:1 to 4.7:1)
Considering the similarity in power and weight, you could really improve the acceleration tremendously, just at the expense of top speed and fuel economy.