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  1. #1
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    GUIDE: Fitting Subframe Alloy Locking Collars

    Ok folks,

    I've always wondered how the metal subframe collars were fitted to an S15 so when I did mine the other day with a mate, I took the chance to take pics so hopefully, those who wanna give this a go will know it's not too difficult. I purchased my set of subframe alloy collars from Driftworks


    Jack the car up and get the rear section on axle stands. Then ensure you put a jack underneath the diff centrally.

    Well first pic below shows what the stock subframe front bush looks like when the nut and bracket holding it in place is removed from underneath:





    Basically there are two front subframe mounting points (where the rear suspension bolts to) and two rear mounting points (more central and closer to rear of diff). We got to work by loosening all the nuts/bolts for the brackets on the front mounting points so there's enough room to prise the subframe and bush down so the top collars can be slipped in place. Don't remove these nuts/bolts entirely in case the subframe might fall off!! Well, we were paranoid about this anyway




    As above pic shows, use 14mm socket to loosen the bolts that hold the bracket to the sides of the car and a 17mm socket to loosen the main nut which holds the bracket to the subframe etc. Do this for both sides of the front subframe mounting points. At this point you must ensure the diff is still being firmly propped up by a jack (as mentioned at beginning). Once all nuts/bolts are loosened then VERY SLOWLY drop the jack holding the diff. Only by a couple of centimetres. It's unlikely the subframe will drop cos of the bushes so use a pry bar to prise the subframe downwards - on both sides. You should then have a gap that's big enough to slot the top collars like so:





    Next to finish off the front mounting points by fitting the bottom collars (completely circular collars without the cut-out section) jack the diff up so it should then move the subframe back up and leave you more thread to get the bottom collars underneath the existing bushes. Then completely remove the nuts/bolts for the bracket, slot in the bottom collars and then put brackets back on underneath:




    If you have the same issue as my bottom collars then this is a real tight fit which means they don't go on flush against the stock bush. So get another jack and force the bracket to be pushed against the new collar plus bush etc until it's all nice and flush - sorted!!




    Tighten all the nuts/bolts for brackets and the front subframe is now completed. Moving onto the rear mounting points, these are not as fiddly because there is no bracket. So again, with the car on axle stands and separate jack holding diff, take off the brace (or whatever it's called) that joins the two rear mounting bushes for the subframe. Once this brace is removed, put the original nuts back on the threads - in case the subframe might drop out (but it shouldn't!!). Once the nuts are in place, drop the jack a few centimetres and then with pry bar, prise downwards the bushes so there's enough of a gap to slip in the top collars like before. Then jack the diff up again and fit the bottom collars, put the brace back on, nuts back on and it's all finally done!!




    I'm hoping I got everything right but please feel free to comment/correct.

    Nice1 - J

    BTW - I know the underneath of my car doesn't look as nice as Dean's and yes, it really needs a good session of jetwash and underseal!!
    Last edited by LuPix_S15; 12-04-2010 at 01:04.


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  2. #2
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    not a bad lil write up tbh

    i now feel better knowing sombody has a rustyer s15 than me
    only got a lil bubbling on rear archs :P

  3. #3
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    Front bushes look the same as mine. Perhaps I should have another go at fitting my set.

    Do they make that much difference to the drive?

  4. #4
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    Nice write up James! I undid all the nuts/bolts and the subframe didnt fall off haha - could hardly move it even with a prybar when trying to slot the top collars in

    Dan - makes loads of difference mate, the front and rear of the car feels somewhat more connected lol only negatives are a bit of a harsher ride and some diff whine/vibration but who cares about that? do it!

  5. #5
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    Cheers guys


    lol Si - yeah I know I'd deffo win 'the most rusty' S15 award on the owners club

    Dan - yep hope that confirms you have an original subframe bush etc. Give it another go mate.

    James - my mate and I are a little paranoid about stuff dropping off whilst working under the car so took extra precautions although I did remember you telling me it won't drop off haha Getting a bit more vibrations now and then from diff but it's not overly harsh to me and backend does feel tighter. So much so it's making the front feel more sloppy so can't wait to get ARB's sorted


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  6. #6
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    Nice write up mate! Im looking forward to gettings some ARBs


    [SIGPIC][/SIGPIC]


  7. #7
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    Cheers mate - take it you're on the same SXOC/Apex group buy now for the ARB's??


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  8. #8
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    I am on there for the coilovers mate yeah! Im just seeing how things go at the moment for the ARBs.... you know what its like though, i will more than likely buy the ARBs too lol


    [SIGPIC][/SIGPIC]


  9. #9
    craig8585 is offline I'm so cool, I have my own fan thread :p
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    Good write up James, I'll add it to the useful threads as the link we have doesn't seem to work anymore

  10. #10
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    Hopefully when I do get mine fitted, the car will feel a bit more like my old 180sx. With poly bushes in the subframe, hubs and front and rear lower arms, DW CS1's, whiteline anti roll bars, a full compliment of rose jointed arms, and a rear roll cage it used to handle really positively.
    At the minute I don't feel my silvia handles as well as the 180 did, but I have only got DW CS2's fitted at present. I don't want to go quite as far as I did with the 180, as in I don't want a cage, but hopefully the extra bracing on the spec R will make up for this

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