shankeroid Posted October 13, 2019 Share #1 Posted October 13, 2019 Just acquired a 260z with triple Mikuni 40PHH's and would like to learn proper tuning techniques for these carbs. I've done numerous searches for any kind of manuals dealing with the subject, and the only one I've found is the "Mikuni PHH Carburetor Service Manual." Anyone have any leads on any other manuals that deal specifically with tuning these carbs? Link to comment Share on other sites More sharing options...
madkaw Posted October 14, 2019 Share #2 Posted October 14, 2019 Might read this thread - might help https://www.classiczcars.com/forums/topic/42960-triple-mikuni-thread/ Link to comment Share on other sites More sharing options...
duffymahoney Posted October 15, 2019 Share #3 Posted October 15, 2019 Here is the original.Pm I can send you one, that I would rather not share. http://www.tuning4performance.com/documents/Mikuni -44-PHH-SM.pdf Link to comment Share on other sites More sharing options...
shankeroid Posted October 15, 2019 Author Share #4 Posted October 15, 2019 Thanks, Madkaw and DM.......a lot of threads to sift through!! I do have Mikiuni's PHH Carb Service Manual, but looking for a manual or guide (if one exists) that can start me from the beginning at step one. I know the process is a lot of trial-and-error, but where to begin? This is all new to me, but I have the time and patience to learn. Link to comment Share on other sites More sharing options...
240260280 Posted October 15, 2019 Share #5 Posted October 15, 2019 Not Mikunis but close enough that you may pick up some helpful data: http://240260280.com/Tech/Carbs/Weber/DCOE Theory Operation and Tuning.html Link to comment Share on other sites More sharing options...
Mike Posted October 15, 2019 Share #6 Posted October 15, 2019 From what I've seen, tuning Mikuni's is a 'process' of its own. When I had mine installed, the guys at Ztherapy had to play around a bit with jet sizes to get them to work correctly. Steve had a small kit (with different jet sizes) and was experimenting until it was tuned properly. My car has a mild cam upgrade and a L28 block. He was able to tune it to work with my driving style. Results will vary depending on what you want to do with the car. If it's a daily driver, you'll use one set. But, if you are racing track, there will be a different set. I don't know where to get the different jets, or even a kit, but, it may be worth a call to someone experienced with the carbs. That said, after the main tune up, I haven't had to touch the carbs since. Link to comment Share on other sites More sharing options...
Mike Posted October 15, 2019 Share #7 Posted October 15, 2019 I did find this website with more information about recommended jetting. It does have recommendations for 240z-280zx. https://www.upgrademotoring.com/performance/mikuni/mikuni_jettingparts.htm 1 Link to comment Share on other sites More sharing options...
shankeroid Posted October 15, 2019 Author Share #8 Posted October 15, 2019 Excellent, Mike. Grassy-arse! Link to comment Share on other sites More sharing options...
240260280 Posted October 15, 2019 Share #9 Posted October 15, 2019 Interesting: 240/260Z/280Z have same Mikuni Settings for 40mm's. Weber and Mikuni are close for same choke: Link to comment Share on other sites More sharing options...
madkaw Posted October 16, 2019 Share #10 Posted October 16, 2019 Buy a wideband O2 sensor and install - it will make life much easier for you Link to comment Share on other sites More sharing options...
Yarb
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