S15 HLSD is AWESOME!!!

[e1_griego]

The whole gear thing only matters if you're using the s15 ring gear (which I'm assuming is different) instead of the s13 ring gear. I'm also assuming that you have to get a different pinion if you want to use the s15 ring gear, though I'm not sure.

Either way, I'm running the s13 one and it's fine. In terms of install, I had mine installed (because I'm lazy, and don't have easy access to a lift. Mostly, you just have to keep the stock shims sorted (as in, make sure to remember which shims go where-- left side or right side), and then put them back in the same order with the s15 internals.

Alex

[S3t0_S13]

sorry dude, can u kinda walk me through it? drivetrain is not my expertise...

so u can buy only the pumpkin of the helical and have it "dropped in" the S13 stock diff?

basically have the gears pulled out, and nothing else needed? or am i missing a halfshaft or output shaft here

thanks

[zalfano]

has anyone run the OBX H-LSD? or is the stock s15 one better? is just the LSD unit required? what else...?

thanks. (picking up my first 240 on wednesday, will post pics when i get it.)

[thenillaz]

has anyone run the OBX H-LSD? or is the stock s15 one better? is just the LSD unit required? what else...?

thanks. (picking up my first 240 on wednesday, will post pics when i get it.)

Might want to research and use the SEARCH button before you get flamed. Just looking out for you... BTW we were just talking about what you had to ask...

[mksue3240sx]

is that obx unit any good?

[e1_griego]

sorry dude, can u kinda walk me through it? drivetrain is not my expertise...

so u can buy only the pumpkin of the helical and have it "dropped in" the S13 stock diff?

basically have the gears pulled out, and nothing else needed? or am i missing a halfshaft or output shaft here

thanks

Basically the only way to find the s15 helical is to buy the internals--all the auctions on ebay are just the interal helical unit itself, not the entire pumpkin. That means you have to swap out the s13 guts to put the s15 stuff in.

The vast majority of the s15 units that I've seen don't have a ring gear attached, so you have to use your stock s13 ring gear with them as a result. You need an impact gun to break the bolts loose--I'd imagine it's a giant pain in the *** by hand. The ring gear is what determines your rear end ratio, and I'm pretty sure you have to swap out the pinion to run a different ring gear.

Anyhow, if you're intent on getting one, I'd probably just spend the money and have it installed and then not worry about it.

As for the Obx, it runs around $400 shipped on ebay, and from the few reviews I've read it's fine. I know that the Honda guys who use the obx units like to disassemble them and retorque everything down (since obx does a so-so job of quality control, apparently). Honestly, if I were to do it again, I would go with the s15 unit again, since it's a direct bolt on with no hassle. However, I also picked up my helical for $340 shipped (for everything) which is an unusually good deal, as far as ebay goes.

Alex

[AZhitman]

I'd encourage everyone asking questions in this thread to go back and RE-READ what's been posted.

S3to, you're kinda missing the point.

Here's the main components:

Punkin (housing that holds everything). Same, regardless of WHAT you put in it.

Differential (Assembly INSIDE the punkin).

Ring gear (Most typically swapped to change ratios).

Pinion gear (Leave it the hell alone).

Stub axles / output shafts (Some say they have to be swapped, some disagree - it's still unclear).

You asked: "wait, so i can get a S15 hsld gears and drop it into the stock S13 open diff?"

NO. What you want when you buy the S15 helical is the differential (see above). The diff will drop into your stock punkin, and you will re-use your stock ring gear.

The bolt issue is irrelevant, since the ring gear is "hubcentric" (centers on the diff)... the bolt holes will be aligned regardless.

You will NOT need to change speedo gear, as you're NOT changing ratios.

You don't need to worry about an S15 ring gear, because you won't GET one. The diff usually ships without it, you have no need for it.

I would stay away from the OBX. They're not a significant enough savings to warrant using sub-standard parts.

Lastly, drifting with an HLSD would be silly.... I have a hell of a time getting mine to "step out" now, and there's MORE than enough power. It just grabs and GOES.

[e1_griego]

Yup, it's hard to *really* coax the rear end out, especially with an anemic single cam and 255/40/17s lol. You can pop the clutch and get it to come out, but mostly it's just a hold-on-for-the-ride affair.

Can't get enough.

Alex

[Driftless240]

Yay, got all my info!!! Also +100 that the Yellow Arrows are back up to show threads with new posts.!! I am excited, I want to get one of these, my buddy is like all "But dood they suck for drifting," he is all Drift, and doesn't understand that I am not the same way. As long as I can get it sideways sometimes that is all that matters, I am not going to be competeing with it, so I do not need a get completely drift ready LSD.

[mmm240]

Lastly, drifting with an HLSD would be silly.... I have a hell of a time getting mine to "step out" now, and there's MORE than enough power. It just grabs and GOES.

i have a 400hp LS6 on the way that says i'll get that b*tch to "step out" whenever i please, regardless of differential!good thread though, lots of usefull info

[e1_griego]

Methinks Greg's car is not so slow.....

Alex

[AZhitman]

What makes you think I'm not putting down that much?

I can certainly make it pivot on the front wheels and do the hula in a cloud of smoke, but under normal aggressive driving, the VLSD would fishtail like hell. The HLSD sticks n' grabs, tho.

[thenillaz]

Thanks for the info hitman, I was about to scan the exploded view of the open diff from my FSM to give an illistrated idea, but I don't think its necessary since those with questions should always look their themselves. Or at least I answer alot of my questions from looking in the FSM...

[S3t0_S13]

yea i think i got it now, thanks a bunch guys

as for me, i think the $100 viscous im gettin should be ok, i dont wanna upgrade from a open straight to helical, ill learn a few things, wear out the viscous, then uprgade to the helica

You asked: "wait, so i can get a S15 hsld gears and drop it into the stock S13 open diff?"

sorry, i meant into the stock S13 pumpkin, lol

[AZhitman]

[98koukile]

I heard from some shop, can't remember who, that with the stock output shafts the helical acts like an open diff because one S15 shaft is slightly different in length and design and that's what caused it to engage.I don't know maybe they both work that's just what I heard

[e1_griego]

Look about the same to me....

Alex

[zalfano]

i understand everything that was posted. im asking if anyone has used the OBX LSD, because this thread is on the s15 LSD., and if the stock input shafts would work with the OBX. Im assuming they would, otherwise the OBX unit isnt worth the money.

[thenillaz]

Well, there's this big *** huge thread about some one who is testing it, ever since 2005 I think, and if you searched you could find it. Excuse me for saying, but I'm not gunna go back and find it. You are however correct, the stock open diff output shafts will work on teh OBX.

[ishkabibble]

Methinks Greg's car is not so slow.....

Methinks a tuned LS6 makes over 300 ft/lb of torque throughout the powerband. That's probably why he said "whenever I please".

[S3t0_S13]

Look about the same to me....

Alex

methinks the one on the left is longer

[e1_griego]

Yup, because that 1/8" makes a HUGE difference!

Not to be a d!ck, but I actually have the diff, in my car, with the open diff output shafts. If you're really concerned about it, just buy the s15 output shafts I have for sale.

Alex

[S3t0_S13]

i have teh good eyez

just wanted 2 be annoying and correct you

[e1_griego]

Ha, fair enough.

Alex

[seth]

I have the s15 shafts in by garage right now. I have a vlsd as it is.. I know for a fact that the s15 shafts are two different lengths. Tho sadly I forget what one goes on what side I hope they have a little L or R on them.

As for the s15 ring gear.. what is the difference.. I bought an entire s15 diff so I have absolutely everything from an s15. But I also own just the s15 diff. I have one for a spare.

Should I go s15 ring gear or go s13 ring gear being as it appears I have the choice.

[mmm240]

What makes you think I'm not putting down that much?

I can certainly make it pivot on the front wheels and do the hula in a cloud of smoke, but under normal aggressive driving, the VLSD would fishtail like hell. The HLSD sticks n' grabs, tho.

I still don't know what you have done to your car!I'm waiting for part 8!

[Jookmasta]

greg is ka-t...............not LSX............cliff notes for thread: helical FTW.

[Edub1]

So, when shopping we should look for an S15 diff with shafts? Then buy what bolts?

[thenillaz]

Usually the sharfts will be sold with the diff, but remember to make sure. Then you need these Nismo bolts, they are 12mm thread with 13mm thickness. On the first page of the tires/suspension page there is a thread that has more details on the bolts.

[e1_griego]

Or buy the output shafts from meeeee

Seriously though, I highly recommend this upgrade. And I probably wouldn't worry *too* much about the bolts.

Alex