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Thread: S14 Q's to S15 HLSD Conversion Questions

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    S14 Q's to S15 HLSD Conversion Questions

    Hi everyone,

    I've been looking into updating my diff in my Q's to the Helical LSD from an S15 Spec R.

    My question is this: has anyone done this conversion and/or knows exactly the differences in diff internals/output shafts/pumpkin of the S14 and S15?

    As far as I am aware, the only parts needed for this conversion are the HLSD itself and output shafts of the S15 which SHOULD match up to my existing axles, while the ring gear bolts right onto the HLSD.

    This my first time touching the diff of an S chassis, so please bear with me!

    Many thanks!

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    Have a read of this topic where I was looking at a Quaife Helical and the S15 conversation came up.

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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Hi, be careful as I'm pretty sure the S14 Q's came with an R180 rather than an R200, so nothing is going to swap over. Better off buying a complete diff if you can.

    For the money you really can't beat the S15 HLSD on a road car.

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    Cheers for the link!

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    Okay, I'll look further into that. There seems to be a real lack of information when it comes to Q's differentials.

    Am I correct in thinking that if it is an R180, the axles and hubs will need replacing as well as the entire diff?

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    Hi again, so I got under the car and tried to take a few pictures (not the greatest, sorry). I'm almost certain it's an R180, but can anyone confirm this? Obviously, this will mean I can't get an S15 HLSD without swapping subframes and getting an R200 and propshaft (probably won't do that).




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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Yes, that's an R180, subframe swap required.

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    I've heard R180s are okay for acceptable power if you upgrade the internals; been looking at KAAZ's offering and considering just keeping what I've got and getting their 2 way diff?

    The plan was to swap in the SR20DET once I've got one ready and keep my drivetrain, if that's advisable. I'm not going to go for a ton of horsepower (no more than 250-300) or torque.

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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Personally I'd swap the subframe and take the opportunity to replace the bushes at the same time.

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    Okay, say I did that, would I be able to keep my propshaft and axles? As in, would the R180 axles and propshaft bolt directly onto the new R200 assembly? It's surprisingly hard to find info on this, so thanks for your help

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    bump

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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Axles yes.

    It looks like yous is an ABS diff, so any ABS prop should fit.
    Last edited by Actual_Ben_Taylor; 27-03-2021 at 07:13.

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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    I wonder if offset diff bushings are available anywhere, that would be an easy option

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    Quote Originally Posted by Actual_Ben_Taylor View Post
    Axles yes.

    It looks like yous is an ABS diff, so any ABS prop should fit.
    Hmm okay, you don't happen to know if R200 axles would work with my 4 lug hubs, do you? Just worried about the spline count.

    And yeah, I do have an ABS diff.

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    Quote Originally Posted by Actual_Ben_Taylor View Post
    I wonder if offset diff bushings are available anywhere, that would be an easy option
    It would be an easy solution, I'll have a dig

    Cheers for your help buddy!

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    Quote Originally Posted by oliverredick View Post
    Hmm okay, you don't happen to know if R200 axles would work with my 4 lug hubs, do you? Just worried about the spline count.

    And yeah, I do have an ABS diff.
    Yes, they're all the same.

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    Quote Originally Posted by Actual_Ben_Taylor View Post
    Yes, they're all the same.
    Gotcha. So the order is R200 diff, subframe and output shafts? Then a different prop, probably from an S14a?

    Thanks again

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    I <3 BBS LM Actual_Ben_Taylor's Avatar
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    Quote Originally Posted by oliverredick View Post
    Gotcha. So the order is R200 diff, subframe and output shafts? Then a different prop, probably from an S14a?

    Thanks again
    Yes - complete diff with output shafts and subframe. You should be ok with your prop.

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