4.10 vs 4.3 in 20B N/A FC

Roen · 06-12-2008, 09:30 AM

You might break the Torsen with that much power and the added torque of the 3 rotor. I would still test it and if that doesn't work, there's always the viscous. How's the condition of your viscous LSD though? How many miles?

You can do the math, the 4.33/4.10 = 1.056 so 5.6% increase in acceleration and a 5.6% penalty in top speed.

Though, it'll feel quicker, because you spend less time in the low end.

Which 4.3 R&P are you getting? I think Mazdatrix's or Racing Beat's is a 4.375:1.

Christopher W. · 06-12-2008, 10:15 AM

I edited my first post because I wasn't sure if we are talking about the same thing. The stock n/a 4.33 rear end is coming out for sure. I bought a 90 TII to go in. The TII rear has 85,000 miles and is getting a good check tomorrow. I was saying I might just keep the TII stock diff in and see how it goes. If I upgrade I was thinking about the Guru Torque Biasing Differential.

As for the R&P I was probably getting Mazdatrix. Racing Beat's is 525.00. I haven't spoke to Mazdatrix yet. Their website is getting upgraded or something and don't know the price yet. I have dealt a lot more with Mazdatrix.

Thanks Roen, that formula puts in a more tangible perspective. I think the 4.3 is what I want.

Fidelity101 · 01-04-2009, 08:17 PM

Quote:

Originally Posted by Roen

You might break the Torsen with that much power and the added torque of the 3 rotor. I would still test it and if that doesn't work, there's always the viscous. How's the condition of your viscous LSD though? How many miles?

You can do the math, the 4.33/4.10 = 1.056 so 5.6% increase in acceleration and a 5.6% penalty in top speed.

Though, it'll feel quicker, because you spend less time in the low end.

Which 4.3 R&P are you getting? I think Mazdatrix's or Racing Beat's is a 4.375:1.

Torsons are planetary gear sets, stronger than any clutch or viscous diff by design.

The GM turbo 400 trans is basically some fluid, a case, and 2 planetary gear sets and people use them in 1000hp drag cars because of the durability of a planetary gear set.

RETed · 01-22-2009, 05:41 AM

Quote:

Originally Posted by Fidelity101

Torsons are planetary gear sets, stronger than any clutch or viscous diff by design.

You're right if the gears don't walk...
This is the problem with the FD stock Torsen LSD...
The case flexes and all hell breaks loose.

-Ted

06-12-2008, 10:15 AM	#2
Christopher W. Rotary Fan in Training Join Date: Mar 2008 Posts: 98 Rep Power: 18	I edited my first post because I wasn't sure if we are talking about the same thing. The stock n/a 4.33 rear end is coming out for sure. I bought a 90 TII to go in. The TII rear has 85,000 miles and is getting a good check tomorrow. I was saying I might just keep the TII stock diff in and see how it goes. If I upgrade I was thinking about the Guru Torque Biasing Differential. As for the R&P I was probably getting Mazdatrix. Racing Beat's is 525.00. I haven't spoke to Mazdatrix yet. Their website is getting upgraded or something and don't know the price yet. I have dealt a lot more with Mazdatrix. Thanks Roen, that formula puts in a more tangible perspective. I think the 4.3 is what I want. Last edited by Christopher W.; 06-13-2008 at 08:26 AM.

06-12-2008, 09:30 AM	#1
Roen Evil Club Mod Join Date: Feb 2008 Posts: 183 Rep Power: 18	You might break the Torsen with that much power and the added torque of the 3 rotor. I would still test it and if that doesn't work, there's always the viscous. How's the condition of your viscous LSD though? How many miles? You can do the math, the 4.33/4.10 = 1.056 so 5.6% increase in acceleration and a 5.6% penalty in top speed. Though, it'll feel quicker, because you spend less time in the low end. Which 4.3 R&P are you getting? I think Mazdatrix's or Racing Beat's is a 4.375:1.