Originally Posted by FRSBRZGT86FAN (Post 2649370)

Why do drifters lock their axles together?
Because drifters care very little about handling, they want both wheels locked together so they spin at the same time and at the same speed. Alternatively they may go for 2 way LSDs

Come on dude, you're pushing it, in what world would the Diff fluid effect over-steer on this car? have you owned other cars that induced over-steer because of the fluid? What led you to that conclusion?

Also your mclaren and lotus examples don't even apply here

McLaren P1: They use frictional balancing with brakes/electric motors so they don't need an LSD system as they can be more precise without it.

Mclaren MP4,670s, 570 etc: Use brakes on the inner wheels at times moments, also the suspension is adjusted on the fly, they also have NO sway bars everything is connected electronically or hydraulically and adjusted in split second intervals (this is in the P1 as well)

For the lotus: A limited slip differential matters more in wider, heavier cars than it does in narrow lightweight cars, FYI, because the different radius paths of travel are smaller, and the distribution of weight left-right during a corner is smaller as well. They are famous for saying it here:
http://www.lotustalk.com/forums/f25/...06/#post552007

Originally Posted by ansibe (Post 2649479)

I think the oil you run in your diff will affect the way it reacts, and therefore the car's balance.

Originally Posted by irax (Post 2649460)

LOL changes springs and doesn't understand that it will affect handling characteristics.

Your brain fluid needs to be changed.

Look, from the fact that you know the FRS springs are stiffer and you changed them on the rear it should be no surprise to you that it would induce oversteer.

Why would you even think that its related to the fluid ?

Originally Posted by mav1178 (Post 2649489)

You don't know how a Torsen diff works, hence the misunderstanding.

Originally Posted by ansibe (Post 2649494)

If you're not contributing to the discussion, go troll another thread.

Originally Posted by ansibe (Post 2649526)

That video is awesome! Thank you. This is just the response I needed. I guess as long as the diff fluid 'lubricates', I'm good. I wonder why there are different specs for transmission and Diff oil. Must be materials ...

Originally Posted by cdrazic93 (Post 2649537)

Im sorry if what you dont want to hear is critism and you assume its trolling. Welcome to the internet.

Originally Posted by FRSBRZGT86FAN (Post 2649553)

This is the type of person I wouldn't want modding the car, does everything all at once and then blames the wrong thing for oversteer.

Originally Posted by ansibe (Post 2649453)

We have almost identical setups. The Koni's seem to have far less compression damping than OE, which may be allowing the front to drop with corner loads.

Your alignment is more aggressive than mine, but you don't seem to be having any trouble. What tires are you running?

Originally Posted by ansibe (Post 2649494)

Of course I knew FRS springs would move grip to the front. Because I'm using BRZ fronts (also stiff), I'm still softer (relatively speaking) at the rear than the FRS.

Originally Posted by FRSBRZGT86FAN (Post 2649370)

Why do drifters lock their axles together?
Because drifters care very little about handling, they want both wheels locked together so they spin at the same time and at the same speed. Alternatively they may go for 2 way LSDs

Come on dude, you're pushing it, in what world would the Diff fluid effect over-steer on this car? have you owned other cars that induced over-steer because of the fluid? What led you to that conclusion?

Also your mclaren and lotus examples don't even apply here

McLaren P1: They use frictional balancing with brakes/electric motors so they don't need an LSD system as they can be more precise without it.

Mclaren MP4,670s, 570 etc: Use brakes on the inner wheels at times moments, also the suspension is adjusted on the fly, they also have NO sway bars everything is connected electronically or hydraulically and adjusted in split second intervals (this is in the P1 as well)

For the lotus: A limited slip differential matters more in wider, heavier cars than it does in narrow lightweight cars, FYI, because the different radius paths of travel are smaller, and the distribution of weight left-right during a corner is smaller as well. They are famous for saying it here:
http://www.lotustalk.com/forums/f25/...06/#post552007

Originally Posted by CSG Mike (Post 2649674)

Don't confuse traction control with a "simulated electronic limited-slip differential"

Originally Posted by ansibe (Post 2647650)

I made several changes to my BRZ at once, and now I have a slight oversteer problem. Mods:

-dampers changed to Koni Yellow
-rear springs swapped to OE FRS (stiffer)
-Aligned to -1.5 camber and 0 toe all around.
-Diff fluid changed to Amsoil 75w-90 GL-4
-No change to the sways. I'm on OE BRZ

I Think the component changes are pretty conservative, so I'm surprised how much more oversteer I have. It's fun, but I'm not a drifter so I want grip.

Could this be caused by the diff locking early because of the fluid I'm using? I think I should have used GL-5.