4.10 vs 4.3 in 20B N/A FC - Page 2

Christopher W. · 09-19-2008, 05:34 PM

I think you are right Gordon, especially with higher horsepower. But I am going to be below 400rwhp. Remember, it is a N/A... I have listen to some different theories on the subject. I figure the best way for me to make a decision is to try it first. Like I said earlier, if it isn't what I want I will just change it.

By the way, I spoke to Logan today. I am going to get my car to Defined Autoworks in the next two months. He said that I should be able to have it back by summer. That works for me...

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.

Roen · 01-13-2009, 08:32 PM

Perhaps generally speaking, but when discussing FC's, we usually assume talking about S4 Clutch-type diffs vs. S6 Torsen diffs.

I'm sure you can find out which one is stronger.

Fidelity101 · 01-13-2009, 10:15 PM

Give me both for free and I will let you know.

Roen · 01-14-2009, 10:53 AM

Or you can read about the countless S6 Torsens being destroyed with high power turbo FD's and their owners being much happier with the S4 clutch diff replacement.

Read some threads in the FD sections of the many RX-7 forums out there, you'll see what I mean. Don't take my word for it, take the FD owners'.

StarSpeedRacing · 01-16-2009, 11:10 PM

If you rev up to 10-12 grand RPM the your gears wont feel so short.
Get everything Cryo treated and performance coatings applied to give yourself a little more insurance.

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

01-13-2009, 10:15 PM	#19
Fidelity101 Reliable Source Join Date: Nov 2008 Location: Michigan/Illinois Posts: 336 Rep Power: 17	Give me both for free and I will let you know. __________________ My Rx-7 Vids

01-16-2009, 11:10 PM	#21
StarSpeedRacing StarSpeedRacing Join Date: Dec 2008 Location: California Posts: 34 Rep Power: 0	If you rev up to 10-12 grand RPM the your gears wont feel so short. Get everything Cryo treated and performance coatings applied to give yourself a little more insurance. __________________ StarSpeedRacing Parts Development & Discount Parts! GB:FD Intercooler Kit GB:Stainless Non Turbo Headers Contact: StarSpeedRacing@gmail.com

09-19-2008, 05:34 PM	#16
Christopher W. Rotary Fan in Training Join Date: Mar 2008 Posts: 98 Rep Power: 18	I think you are right Gordon, especially with higher horsepower. But I am going to be below 400rwhp. Remember, it is a N/A... I have listen to some different theories on the subject. I figure the best way for me to make a decision is to try it first. Like I said earlier, if it isn't what I want I will just change it. By the way, I spoke to Logan today. I am going to get my car to Defined Autoworks in the next two months. He said that I should be able to have it back by summer. That works for me...

01-13-2009, 08:32 PM	#18
Roen Evil Club Mod Join Date: Feb 2008 Posts: 183 Rep Power: 18	Perhaps generally speaking, but when discussing FC's, we usually assume talking about S4 Clutch-type diffs vs. S6 Torsen diffs. I'm sure you can find out which one is stronger.

01-14-2009, 10:53 AM	#20
Roen Evil Club Mod Join Date: Feb 2008 Posts: 183 Rep Power: 18	Or you can read about the countless S6 Torsens being destroyed with high power turbo FD's and their owners being much happier with the S4 clutch diff replacement. Read some threads in the FD sections of the many RX-7 forums out there, you'll see what I mean. Don't take my word for it, take the FD owners'.