Results 1 to 15 of 15

Thread: Ztherapy S.U. conversion

  1. #1
    Registered User rclayton12's Avatar
    Member ID
    CZCC-7369
    Join Date
    Nov 2004
    Location
    Paris/Austin, TX
    Posts
    58

    Default Ztherapy S.U. conversion

    I have just bought a set of the S.U.s from Ztherapy for about $750 with the adapter for the air filter. They are going on a 73 240z that had the hitachi flat top carbs. How hard are they to install and what can I expect to encounter? anyone ever ordered theirs from ztherapy? How long does it typically take?

  2. #2
    Supporting Member ChrisA's Avatar
    Member ID
    CZCC-5906
    Join Date
    Feb 2004
    Location
    Lincoln, NE
    Age
    51
    Posts
    1,471

    Default

    Hi Richard,

    My 73 has ZT carbs. But I have the whole setup from a 72. Manifolds, air box, etc. Took me about 4 hours. Of course there was some beer drinking going on.

    Some of the other members will hopefully chime in here. I've heard there might be a spacing issue between the carbs using the Hitachi manifolds. But I may be all wet on that. I remember member "beandip" saying that the connector linkage between the carbs needs modifying.

    Try searching the forums for better answers than mine, I know they're there.

    Much luck,
    Chris A.
    1973 240Z HLS30-156693

  3. #3
    Z fever Fun_in_my_z's Avatar
    Member ID
    CZCC-5338
    Join Date
    Nov 2003
    Location
    Arkansas
    Posts
    3,965
    Blog Entries
    1

    Default

    The carbs should come with a Video that will help you. I have a extra set of round tops with most of the linkage. The carbs are pretty much shot but if you need linkage parts let me know.
    HLS30-217804 6/75 "The Unnatural One"

    One
    Big
    Ass
    Mistake
    America

  4. #4
    Registered User
    Member ID
    CZCC-4244
    Join Date
    May 2003
    Location
    Rio Rancho, NM
    Posts
    104

    Default

    I have the correct manifold that you need. You would have to find the linkage stuff but you will have the manifold and balance tube. Your cost? Nothing, just let me know you want them and it's yours. I feel like giving today.

    Art

  5. #5
    Registered User
    Member ID
    CZCC-2062
    Join Date
    Apr 2002
    Location
    Northern Virginia
    Age
    63
    Posts
    66

    Default

    Reading the posts brings up a question on my part. I have 2 sets of round tops and the manifolds are still attached. Should I replace the manifold that is currently on my 73 when I do the swap out?
    Thanks
    ZOT
    Last edited by alordzot; 03-29-2006 at 10:39 AM. Reason: Change name on the end

  6. #6
    Master of Weaponry Dtsnlvrs's Avatar
    Member ID
    CZCC-3591
    Join Date
    Feb 2003
    Location
    Junction City, KS
    Age
    49
    Posts
    421

    Default

    Whatever any of you do, KEEP the 73 and 74 manifolds.....just replace the balance tube with the earlier style. Nissan changed the casting on the later cars to improve the combustion mixture in cyl 2 and 5....if you doubt this....look down an original 70 intake and tell me how much intake you see for 2 or 5 then look down the intake of a 73 or 74. Dont know how much HP gains could be had but will say from experience that all 6 plugs will read the same as opposed to 2 and 5 being "off"
    Russell A. Buckwalter
    SFC US Army
    Aviation


    She now lives on a showroom floor.....I WILL BUILD ANOTHER ONE

    If Nissan Motorsports is NISMO, is Honda Motorsports HOMO?

  7. #7
    Registered User ZSaint's Avatar
    Member ID
    CZCC-7760
    Join Date
    Jan 2005
    Location
    Salem (Willamette Valley) Oregon
    Age
    79
    Posts
    683

    Default

    I used the N36 manifolds for my 3.0. I was told the same info about the manifolds. I have not seen anyone do a dyno test to see if these manifold flow better. They look better and seem to have more flow but no one will give me any dyno results to show they are better. I guess we will continue to believe that they are better.
    Z Saint, the vintage racer! I've traveled a long way and some of the roads weren't paved.

  8. #8
    Registered User d.a.thomas's Avatar
    Member ID
    CZCC-11131
    Join Date
    Mar 2006
    Location
    Glendora,Ca.
    Age
    59
    Posts
    4

    Default

    glad to see that you bouhght the "complete"set-up.i had purchased reworked
    throttle bodies(only) from z-therapathy(for my 6/72 L-28 n-42 engine)did you get new(looking)springs and things?

  9. #9
    Registered User Pop's Z's Avatar
    Member ID
    CZCC-8342
    Join Date
    May 2005
    Location
    Fort Collins, Colorado
    Age
    74
    Posts
    430

    Default Z Therapy carbs

    I just replaced my old round tops of undetermined age(on my 73) with a set from Z therapy. I got the linkage and new springs. What a difference!!! I took a run up into the mountains yesterday and the car seemed transformed. Power on after1500 rpms and no hesitations to 6000rpms. They also gave me different needles (at no charge) as I live at 5000 feet here in Colorado and most of my driving is done at higher altitudes. It may be my imagination, but the exhaust smell seems less obnoxious. It was not a hard thing to do and the video is very thorough and if you have problems Bruce at Z therapy is always helpful if not always available but keep trying.
    "Be happy in your work"
    Mike G.

  10. #10
    Master of Weaponry Dtsnlvrs's Avatar
    Member ID
    CZCC-3591
    Join Date
    Feb 2003
    Location
    Junction City, KS
    Age
    49
    Posts
    421

    Default

    Now if only my triples were that easy
    Russell A. Buckwalter
    SFC US Army
    Aviation


    She now lives on a showroom floor.....I WILL BUILD ANOTHER ONE

    If Nissan Motorsports is NISMO, is Honda Motorsports HOMO?

  11. #11
    Hakosuka sakijo's Avatar
    Member ID
    CZCC-7932
    Join Date
    Feb 2005
    Location
    Sunny Hawaii
    Posts
    528

    Default

    I bought the whole kit too. Still in the box though. Yes, new gaskets, hoses, new or replated linkage and springs.
    Miles

    1971 Skyline "Hakosuka"
    2002 Lexus GS 300

  12. #12
    Registered User rclayton12's Avatar
    Member ID
    CZCC-7369
    Join Date
    Nov 2004
    Location
    Paris/Austin, TX
    Posts
    58

    Default

    Yes came with replated springs, center linkage and everything. I have mounted them and have got it running. I need to get the timing checked because it is definately off. Does anyone have any tips on cleaning up the 240/260 balance tube?(clearing and jb welding all of the emission things) Has anyone removed the exhaust gas reticulation valve on thier z??

  13. #13
    Registered User xxjoeyxxeb's Avatar
    Member ID
    CZCC-9982
    Join Date
    Nov 2005
    Location
    San Luis Obispo, CA
    Age
    33
    Posts
    113

    Default

    Ya, anyone got any info on the balance tube with emissions crap?
    http://www.cardomain.com/ride/2228239 ZEEMEGO260Z is my member ID

  14. #14
    Registered User Victor Laury's Avatar
    Member ID
    CZCC-1303
    Join Date
    Oct 2001
    Location
    Los Angeles
    Age
    60
    Posts
    1,814

    Default

    ZT also sells a "Shaved" and polished balance tube. I bought one! Delish
    DatsunVic CZC1303
    ダットサンビク
    72 HLS30 94071
    72 510
    70 SRL311 13136
    71 PL521
    Los Angeles
    Visit My Other Photo Site

  15. #15
    Registered User ZSaint's Avatar
    Member ID
    CZCC-7760
    Join Date
    Jan 2005
    Location
    Salem (Willamette Valley) Oregon
    Age
    79
    Posts
    683

    Default

    I have disconnected everything on my Z. I have the balance tube and the brake booster line. Everything else has been deleted. It works just fine with my ZTherapy SU's.
    Z Saint, the vintage racer! I've traveled a long way and some of the roads weren't paved.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •