S15 HLSD is AWESOME!!!

[mmm240]

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

i gathered all that through reading part seven. i'm just curious about specs

[94_240sx]

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.

^^Yeah, I bought it on eBay and this is what I received. You must get with output shafts, otherwise you will have hard time sourcing them later. I learned about the bolts in the thread you mentioned in tires/suspension forum.

[seth]

anyone want to answer my question at all? about the different ring gears?

[e1_griego]

You probably need a new pinion to run it, which you probably don't want to mess with. Just run the whatever ring gear you have now.

I've seen number of 3.692 for the s15, dunno how true it is.

Alex

[seth]

Thing is I have an entire s15 diff with absolutely everything with it.I can change anything I need to, to make it work.I am hoping I can just use the bolts that come with the s15 diff instead of ordering those other ones.

[nonvtecaccord]

so do you need the s15 stubs or not to make this work...

[e1_griego]

Why would you want 3.6s? Granted, I don't have boatloads of power, but the 4.08s are fine.

As for output shafts, some say yes, some say no. I still can't believe I saw it all bolt together hahah but I've read a couple other posts on the vast intArweb that came up with the same result I did.

Most hlsds are sold with the output shafts anyway, so you get them regardless.

Alex

[seth]

wouldn't the 3.6 rev less when traveling down the highway?

[e1_griego]

Yeah, but you get longer gearing for all gears, not just the fwy.

Alex

[seth]

That would be awesome being as an sr with 350 wheel hp pretty much makes first and second gear last about 2 seconds.

[AmoebAssassin]

Oh you crazy kids and your helicals

[seth]

I sent you an e-mail..

[DuckyD]

That would be awesome being as an sr with 350 wheel hp pretty much makes first and second gear last about 2 seconds.

The 3.6xx gear ratio would widen your gear ratios, first gear would go to 50mph and second gear would go to 80mph (something like that).Acceleration would be slower with more (theoretical) top end.

[AZhitman]

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.

I'm not certain on the lengths. If you take into account that the passenger side AXLE is longer, then it stands to reason that the passenger side stub axle (output shaft) would be the shorter of the two.

If the S15 ratio is 4.08, then there's no difference in the ring gear.

I'd recommend putting the VLSD and the HLSD up for sale, buying an open diff for $20, dropping the spare HLSD into that, and enjoying the stack of cash and the new HLSD.

[AZhitman]

You guys are making this WAY more difficult than it has to be.

Here's a good rule of thumb: N/A cars will benefit from a 4.36 or even a 4.63 ratio. Boosted cars perform quite nicely on the 4.08 (or 3.96 VLSD). There's NO reason for anything higher (ratio, not numerically) unless you're trying to set land-speed records.

[seth]

If I go by what your saying the s15 ring gear will rev higher on the highway then a vlsd ring gear..Everyone else was saying different.I am just trying to figure out what one I should go with being as I have the option of both.

[e1_griego]

What? No!

The 3.692 will be lower rpm on the fwy than the 4.08 or whatever your vlsd is. You should make another thread about that instead of cluttering up the s15 hlsd thread.

Plus, I don't think it's recommended to remove and reinstall the pinion on your own, not without the right tools to measure preload and everything else.

Alex

[seth]

this is good info for the s15 diff .. as it has to do with choices of putting one in.. the guy that posted above my last post had the ratio's backward thats why I posted.I would prefer to rev less on the highway so I am thinking of going the s15 ring gears if its as simple as just swapping the diff from one pumpkin to the next.

[e1_griego]

The thing is (like I've mentioned 3 times or already), most s15 helicals don't come with the ring gear, so it's a moot point for most helical users.

Alex

[seth]

I know you have mentioned it however some people can get them.

question. If I want to put my vlsd ring gear on can i just use the s15 bolts that came in that my diff?

[Didderson]

ok so i'm sure everyone's asking, what about hte OTHER output shaft. The smaller ones may be the same, but does the other open diff shaft match the length of the s15 one?I'm not trying to be a jerk, i may have just misread ur post above about the 1/8 inch meaning so much .

[e1_griego]

The open diff output shafts are different lenghts as well.

Honestly, everything I've read says it doesn't work. Maybe my car is special?

Alex

[Fahaka]

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

Yeah I think Greg has that torque number beat by a few lb/ft...when he was running 10 psi...

[blackieblack]

i wonder how the lock out properties would compare to a kaaz or tomie unit.

[e1_griego]

What do you mean lock out properties??

Alex

[AZhitman]

this is good info for the s15 diff .. as it has to do with choices of putting one in.. the guy that posted above my last post had the ratio's backward thats why I posted.I would prefer to rev less on the highway so I am thinking of going the s15 ring gears if its as simple as just swapping the diff from one pumpkin to the next.

If you're dropping down to the 3.6 ratio, then there's really no need for an HLSD. Unless you're making MONSTER power, you won't ever have to worry about wheelspin with that ratio, so the type of diff will be irrelevant.

[blackieblack]

What do you mean lock out properties??

Alex

well considering the fact that the s15 unit is an oe unit and that tomie is aftermarket i am wondering as to how responsive they are in comparison to each other. some people say kaaz and tomie lock out with this slightest amount of tourq. they are more responsive than nismo. or should say they feel more responsive. that what i heard.

[blackieblack]

helical is better. thats what i want. im planning on doing drift this summer wich is going to be hosted by club fr in chicago. so iwas planning on going with kaaz or tomie. but i did a search awhile ago to see if the s15 was an option and didnt come up with much. now i here it is so im thinking of going with it. i want a unit that i can use for drift autox but also for the street and not have to go broke over it. a kaaz unit is fairly priced but i would have to get it profesionally installed as per rocommendations and that was quoted at 200-250. so its gonna be around 1000 all together and that alot. if i can go s15 then that would be awsome. i can do it myself.

[e1_griego]

A helical won't lock under deceleration so it's not ideal for drift. In terms of response though, it feels instant.

Alex

[blackieblack]

boohoo..................... ill be broke again then.