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  1. #11
    DeanS15's Avatar
    DeanS15 is offline My car is so clean you could eat off it.
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    Quote Originally Posted by TomK View Post
    A complete reinforced nismo gearbox for the bargain price of 3500, plus shipping, duty and tax.

    http://www.rhdjapan.com/nismo-silvia...ansmission-set
    don't forget this - taken from the nismo website on the s15 nismo gearbox information:

    {Durability Serviceability performance}

    Durability of Engine torque design value: 40kgfm (392N•m)
    Durability of Engine power: 350ps (257kW)
    Recommended Clutch: NISMO SINGLE PLATE CLUTCH
    *Please note: gears may be damaged by input beyond the design values.

    ^^if this is the case, then it's a pointless purchase. the standard gearbox copes with those figures comfortably......

  2. #12
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    Quote Originally Posted by AllanOrr View Post
    ....... as for affecting the drivability I cant see how it will apart from changing the fact it will be a 5 speed instead of 6........
    Thats exaclty my point, the ratios will be different. 6speeds are better for off the line and have the top end, 5speed compress the same length of gearing from 6 into 5speeds.

    The reduced number of gears and adjust ratios are going to effect the way the car drives, without a doubt.

    Dean, do we know the design values of the stock gearbox? i guess its only a pointless purchase is running power higher than those stated, if your stock box goes and you've no intention of running higher power, this is probably a fit and forget solution - although very expensive!

  3. #13
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    Quote Originally Posted by DeanS15 View Post
    don't forget this - taken from the nismo website on the s15 nismo gearbox information:

    {Durability Serviceability performance}

    Durability of Engine torque design value: 40kgfm (392Nm)
    Durability of Engine power: 350ps (257kW)
    Recommended Clutch: NISMO SINGLE PLATE CLUTCH
    *Please note: gears may be damaged by input beyond the design values.

    ^^if this is the case, then it's a pointless purchase. the standard gearbox copes with those figures comfortably......

    Nissan probably say the Durability of engine power for standard gearbox is 300ps, but it's generally considered as you said to be allright to 350 so in turn the nismo should cope with 400.

    But lets be honest, who here is really gonna pay in the region of 4.5 grand for a nismo box. Especially if its only good for 100 brake horse power more than standard.

    I'd take my 4500 save a little bit extra and go to a gearbox engineering specialist in the uk.

    I think the quaife sequential bren had for his sr was 5.5k, so i'm sure you could get a 6 speed synchro box capable of decent power for that kind of money.

  4. #14
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    Quote Originally Posted by craig8585 View Post
    I'd like to know why he has said this. People on SXOC are running OS Giken gearsets with silly power without problems. All of the failings I have heard of on these boxes are either shafts snapping or circlip failure which would surely be ironed out by a gearset?
    What Polo said to me Craig was the face there is not enough oil getting round the box this is why even the uprated gear sets fail, he has custom fitted a 7L sump onto the bottom on his gearbox so its running well more oil that it would be standerd

  5. #15
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    Quote Originally Posted by Topper View Post
    Thats exaclty my point, the ratios will be different. 6speeds are better for off the line and have the top end, 5speed compress the same length of gearing from 6 into 5speeds.

    The reduced number of gears and adjust ratios are going to effect the way the car drives, without a doubt.

    Dean, do we know the design values of the stock gearbox? i guess its only a pointless purchase is running power higher than those stated, if your stock box goes and you've no intention of running higher power, this is probably a fit and forget solution - although very expensive!
    Yea thats true though for the set up I am going for I would prefer to have a solid gearbox even if it has to be a 6speed as I wont be running the car on the strip its build to go sideways rather than a fast road + its hard enough these days to find a quiet road with out a speed camera to hit the limmiter so I dont think it will be that much of an issue

  6. #16
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    Quote Originally Posted by AllanOrr View Post
    Amazing Guide - http://forums.nicoclub.com/rb25-tran...s-t226812.html

    This shows how you mate a RB25 to a Z32 Rear Gearbox Case meaning you down need to cut any of the shifter hole as you would do with just a RB25 conversion
    This has been my bedtime reading the last few nights
    Not exactly... swapping around the parts as much as you can will still leave you with the same shifter problems as a straight rb25 or z32 conversion - that's because the bellhousing lengths are practically the same. You'd only what to do that if you had 2 broken gearboxes and wanting to make 1 good one. Otherwise it's a complete waste of time.

    EDIT: the z32 shifter problem can be solved if you use the alpha omega conversion kit
    Last edited by _Wing_; 09-01-2011 at 16:51.

  7. #17
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    Quote Originally Posted by craig8585 View Post
    I'd like to know why he has said this. People on SXOC are running OS Giken gearsets with silly power without problems. All of the failings I have heard of on these boxes are either shafts snapping or circlip failure which would surely be ironed out by a gearset?
    OS Giken don't make a gearset for the 6spd, neither does PPG and I have a OS Giken s14 box at work that's stripped a gear The 2 main players for 6spd gearsets are PAR and NISMO (there's also HPI that does an upgraded version of NISMO), and for the money you spend the results are... not what you'd expect.

  8. #18
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    Quote Originally Posted by I-nearly-bought-a-batty View Post
    Has anyone ever investigated fitting a 5 speed box from a JDM S15 Silvia spec S (SR20DE engine model)? Assuming the internal strength is the same as the s14 K's gearbox (maybe someone knows?); you'd assume it would be a straight forward swap without some of the adaptations required for the s14 K's conversion. I'll see if I can find out from some locals.
    The flywheel is the major difference between these boxes and the flywheel part numbers are different between non turbo 5 and turbo 6 - so highly unlikely. Besides, a s14/s15 5spd is a downgrade without the strength :P

  9. #19
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    Quote Originally Posted by _Wing_ View Post
    Not exactly... swapping around the parts as much as you can will still leave you with the same shifter problems as a straight rb25 or z32 conversion - that's because the bellhousing lengths are practically the same. You'd only what to do that if you had 2 broken gearboxes and wanting to make 1 good one. Otherwise it's a complete waste of time.

    EDIT: the z32 shifter problem can be solved if you use the alpha omega conversion kit
    Not exactly true because I am taking the rear of the Z32 casing and putting it on the RB25 bellhousing with RB25 internals and using Mazworx's short shifter kit for the Z32 rear casing means I wont need to trim any of the shifter housing where it comes through on the standerd 6 speed as their kit makes it come through at the same angle, I have been told this will work by one of the leading guys in the UK as he has done this before but will keep an up date on my members thread of how it goes

  10. #20
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    RHD sell another six speed gearbox thats been modified by HPI and its rated to 430PS, I know its a wee bit expensive but if my box ever goes bang this is what im thinking about

    http://www.rhdjapan.com/hpi-6-speed-...ia-180sx-58394

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