Hitachi v "Original" SUs | The Z Club of Great Britain
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Hitachi v "Original" SUs

Discussion in 'S30 (240Z,260Z,280Z) Tuning & upgrades' started by Nmd14, May 4, 2017.

  1. Nmd14

    Nmd14
    Z Club Member

    Hi All,

    I wondered if anyone with an L28 engine has swapped from Hitachi carbs to SU HS6 for the better / easier parts supply?

    If so, was there any noticeable drop off in performance?

    Le Mans is getting close and I fear my chances of having my existing Hitachis reconditioned in the next few weeks is pretty remote but I could buy some SUs.

    Cheers,

    Nick D.
     
  2. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    Nick,

    Not a cheap option but speak with Ztherapy, they may be able to hit your timescales.

    Their product TRANSFORMED my car and they set up the right needles in them for your engine / cam etc - super friendly and helpful.

    http://www.ztherapy.com/

    Ali
     
  3. Nmd14

    Nmd14
    Z Club Member

    Thanks Ali,

    I spoke to them today and there is a 3 month wait!

    Cheers
     
  4. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    Wow! Sorry to hear that! At least if you go 2" SUs and change your mind they won't break the bank and there is a good secondhand market for them. I know people have put them on Zs to great effect.

    Can't imagine why you would drop power if set up right, but then again, I'll leave that to the experts to comment on.

    Good luck buddy!

    Ps. There is this of course :evil grin:

    https://www.ebay.co.uk/itm/331133982952
     
  5. uk66fastback

    uk66fastback
    Z Club Member

    That exact ebay auction is in my watched, not because I am looking to buy them, or could afford them, but they are so damn nice to look at!
     
  6. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    LOL I hear that! It is automotive porn. :thumbs:
     
  7. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    Attached Files:

  8. status

    status
    Z Club Member

    Is there anyone over here that would be able to sort them out in time
     
  9. AliK

    AliK
    Z Club Member
    Staff Member Moderator

    In spite of their sexiness Sean, did you find any performance benefits/issues over hitachi ones?
     
  10. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    Don't be silly. Triples are much much sexier. (But 45s, not them piddly 40s)
     
  11. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    They give a broader power/torque range. The L28 on the orange Z in the photos was doing 30 mpg for 202bhp and that included motorway speeds of +85mph.
     
  12. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    Correction - EFi is sexiest - carbs are now for old gaffers.:p
     
  13. jonbills

    jonbills
    ZClub Administrator
    Staff Member Moderator

    And is this club not dominated by old gaffers? QED!
     
  14. AliK

    AliK
    Z Club Member
    Staff Member Moderator



    It's all about electronic $ex with you Sean!! Have to beg to differ, digital may well be accurate and reliable but analogue will always have more soul / art about it!!

    On a more serious note, interesting what you say about 2" SUs. I had "heard" that before but no personal experience of it.
     
  15. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    Triples is all about showing off a bigger sinep than SUs which can easily deliver all the road power needed. EFi is knowing that one's sinep is bigger but keeping it zipped up discreetly.

    Drive both before staking your soul on the argument.;)
     
  16. Al Douglas

    Al Douglas
    Z Club Member

    Sorry Sean. Triples every time.
     

    Attached Files:

  17. Al Douglas

    Al Douglas
    Z Club Member

    :devil:
     

    Attached Files:

  18. Nmd14

    Nmd14
    Z Club Member

    Cheers All,

    I do like the look / sound of those 2 inch SUs. Need to check what else I would have to change though to run them, starting with air filters.
     
  19. Rob Gaskin

    Rob Gaskin Treasurer Staff Member Moderator

    I used 2" SUs and they are a simple swap but your inlet manifold might need opening-up to match the bigger carbs. I used air-filter socks on the 'trumpets' not the best solution but it worked fine until the foam dried out and crumbled.
     
  20. Nmd14

    Nmd14
    Z Club Member

    Thanks Rob,

    Seems like 2" carbs and spares are more difficult to get hold of than the HS6 version and as I'm not doing track days etc, it seems going down the HS6 route with appropriate jets and K&N filters may be the way to go.

    Cheers,

    Nick D.
     

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