Rotary Car Club - 4.10 vs 4.3 in 20B N/A FC

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Rotary Car Club (https://rotarycarclub.com/index.php)

- 20B/3 Rotor Conversion.. (https://rotarycarclub.com/forumdisplay.php?f=132)

- - 4.10 vs 4.3 in 20B N/A FC (https://rotarycarclub.com/showthread.php?t=2630)

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 (Post 28614)

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.

:icon_bs:

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 (Post 65803)

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

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