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The LSD while drifting?

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tocoolat3810

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Discussion starter · #1 ·
First I have a 97 240 se 5 speed, cold air intake and 2.5" exhaust with a cat and straight through muffler, and some suspension work.
Now I have found a J30 diff for my car,the guy will sell to me for 75 bucks.(good deal).
I understand that the J30 diff will slow down my car a tad bit,do to the longer gear ratio, but!!!
Will it effect my drifting? Will it be harder for me to get a drift going?or by having the LSD will it help me get one going?

WHat im trying to say is by having the lsd my car will be slower,but will it be to slow for me to initiate a drift? or will the wheels still be able to have enough power that ill be able to spin them freely?

Please dont flame. My mom always told me "if you dont have anything nice to say, think of something"
 
#2 ·
Well it depends on how your car reacts now, because it'll make your ratio's longer, it'll give it a harder time w/ kicking the ass end out... You have to determine how it will affect your car, do some calculation w/ the different FD's on Speed and what not to determine if it'll hinder your ability to kick the ass out...
 
#3 ·
It's really not that much of a difference. If you were drifting in 3rd, it would be a bigger difference, but stock KA drifting should be pretty close to how it is now.
 
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#4 ·
Engine torque x Transmission gear ratio x Final drive ratio / Radius of tires = Ft.lbs at the wheels.

So lets say 156 ft.lbs (stock KA) x 1.902 (second gear) x 3.92 (J30 Ratio) with a 205/60/15 tire (12.3 inches) = 94.56 ft.lbs
Everything here ^ with the stock S13 diff (4.08) would give you 98.42 ft.lbs.
Hope this helps.
 
Discussion starter · #6 · (Edited)
so is 94 ft/lbs of torque going to be enough for me to get the ass to kick out when I need to or when I upgrade the diff am I going to need to add some power to the motor? Or maybe just some weight reduction? And take off some rotational mass(lighter flywheel, and other things)? I just dont want to do this upgrade and not have enough power to the wheels to get the ass to come out.
 
#7 ·
Let's see, I would look into an eGay header, Ditch that 2.5" for a 3", A LW Flywheel and Clutch would help, and what size tires are you running, because you have to be the one to determine that...
How does it react now, when is it easy, when is it hard, when does it only do it sometimes?
those are questions you gatta ask your self and think, ok now the ratio is longer, the hard ass kicks are gonna get harder, the easy ones are gonna start getting iffy, etc.....
 
Discussion starter · #8 ·
hmm well this is all good information thanks alot 240-kid, but i guess the best way to determine if this is gonna make a difference is by going out and trying it, ill just buy it and see what happens, I mean 75 bucks for a J30 diff you cant go wrong.
 
#11 · (Edited)
From what I read you can use the front diff from an 2001 "SE" Xterra. That would give you a final drive ratio of 4.636.
With those calculations you'd be putting 111.8 ft.lbs down. You shouldn't have any problems drifting then. From my understanding the diff from a 2004 Xterra will fit in the 240sx diff and is a whopping 4.90 ratio!
 
#12 ·
I think you mean Final drive Ratio, not inches.. (That number refers to the Ratio of teeth on the Ring and Pinion Gear)

And yes you can swap the 4.4, 4.6, and the 4.9 FD Ring & Pinion...

I also didnt realize that we could swap our stock Ring/Pinion onto the J30 :p
 
#13 ·
240-kid said:
I think you mean Final drive Ratio, not inches.. (That number refers to the Ratio of teeth on the Ring and Pinion Gear)

And yes you can swap the 4.4, 4.6, and the 4.9 FD Ring & Pinion...

I also didnt realize that we could swap our stock Ring/Pinion onto the J30 :p
Click to expand...
Yeah your right, I ment ratio not inches. I don't know what the hell I was thinking, lol. *edited*
 
Discussion starter · #15 ·
Yeah I used to own that red square 240, it had a 1600 hp jet engine in it, no big deal... lol just kidding it is a very nice car though. Is it a Bitch swapping the diff? it seems like a pretty straight forward swap for my car at least.
 
#20 ·
*ka24e* said:
Engine torque x Transmission gear ratio x Final drive ratio / Radius of tires = Ft.lbs at the wheels.

So lets say 156 ft.lbs (stock KA) x 1.902 (second gear) x 3.92 (J30 Ratio) with a 205/60/15 tire (12.3 inches) = 94.56 ft.lbs
Everything here ^ with the stock S13 diff (4.08) would give you 98.42 ft.lbs.
Hope this helps.
Click to expand...

Oh! I almost had a nose bleed on hat one. Haha! Kidding aside, this is a really useful piece of information for newbies like me. Thanks!

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