Results 1 to 3 of 3

Racing Flat Top Carbs

This is a discussion on Racing Flat Top Carbs within the Open Racing Discussions forums, part of the RACING AND HISTORY category; Has anyone had any experience or tips for tuning these carbs for specifically for racing? I recently bought a ITS ...


  1. #1
    Registered User
    Member ID
    CZCC-25887
    Join Date
    Dec 2011
    Location
    Oregon
    Age
    28
    Posts
    10

    Default Racing Flat Top Carbs

    Has anyone had any experience or tips for tuning these carbs for specifically for racing?

    I recently bought a ITS prepped 260z with the flat tops. All the emission stuff is plugged and the choke removed. The car has EGTs which show about 1100F at WOT on the straights. Last weekend we had a test and tune day at Oregon Raceway Park. The track is at about 2300ft elevation and the temperature was in the low 40 to mid 40's that day.

    We pulled the carbs and measured the needle at 45mm. We tried moving the needle to 45.5mm, 46.5mm and backwards to 44mm. EGTs still read 1100F except for the 44mm which was at 900F.

    Tomorrow we're planning to check the valves and do a compression test.

    What oil do you guys run in your carbs? How much oil? Got any other suggestions?

  2. #2
    Registered User 5thhorsemann's Avatar
    Member ID
    CZCC-22854
    Join Date
    Nov 2010
    Location
    maryland
    Age
    48
    Posts
    1,398

    Default

    If you want a spare set, I'll sell you the ones I pulled off for their scrap value. I was thinking of making a set of lamps out of them. Get a set of 3 screw round tops and go racing on race day, instead of tuning every day.

  3. #3
    Registered User Jeff G 78's Avatar
    Member ID
    CZCC-7975
    Join Date
    Mar 2005
    Location
    Northville, Michigan
    Age
    48
    Posts
    1,884

    Default

    "Tony D" says he can make flat tops out perform round tops. He is on this board, but it's easier to find him on zcar.com or hybridz.org. I too have a box of flat tops. I went with round tops for my 260Z race car.
    Jeff
    Northville, Michigan
    IZCC #1285
    '78 280 10:1 CR, Arizona Z Car header, urethane bushings, Tokico springs, Illumina struts, Panasports w/Hankook R-S2 225/50R16 tires, Maxima 105 amp alternator
    http://www.classiczcars.com/photopos...00&ppuser=7975
    '74 260Z BRE look-alike crap can for Optima Batteries ChumpCar World Series Racing racing
    https://www.facebook.com/Jeff.Grauer

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Flat top carbs. Myth, or.........
    By Dobber in forum Introductions and Z Stories
    Replies: 6
    Last Post: 02-04-2011, 04:32 PM
  2. Flat tops to SU Carbs - Help
    By H3nrY in forum Carburetors (S30)
    Replies: 3
    Last Post: 05-10-2010, 08:29 AM
  3. Flat top carbs
    By RIP260Z in forum Carburetors (S30)
    Replies: 18
    Last Post: 08-04-2006, 05:37 PM
  4. Flat top carbs
    By aldersonr in forum Help Me !!
    Replies: 17
    Last Post: 06-30-2006, 07:09 PM
  5. Flat top carbs and I need help
    By alordzot in forum Carburetors (S30)
    Replies: 34
    Last Post: 05-25-2003, 07:22 PM

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
  •  

Search Engine Optimization by vBSEO ©2011, Crawlability, Inc.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87