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Z Cars at the 2021 Mitty: Friday Edition

Z Cars at the 2021 Mitty: Friday Edition

The Z car count seemed to be down in the paddock and infield, possibly due to Covid along with the forecast of rain on Saturday, the most popular day for the Mitty. Here are most of the Z cars I saw today with a couple of Skylines and a 200SX thrown in for fun.

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    • I would probably do them in pairs, then each pair goes to a common shaft.  
    • Part of running a single shared throttle shaft was for a super clean look- like how datsun_tokyo linked above has it.
      I also still haven’t decided on the manifold- but was planning on the TWM one- seems to be the cleanest and allows me to run without all the linkages. 
      With that said I’m interested- I’ll shoot you PM.
    • I have common under mount bar mount I could sell you, with either teflon or brass bushings. You would need arms, but it would be the best for actually balancing them. Just a thought.
    • That car is one of the main reasons I’ve even considered this. I have been in touch with him- unfortunately the language barrier is tough. Might need to recruit an old autox friend who is in Tokyo now to translate. The owner of that car did express that he much preferred the HSRs over OERs and that he was never able to find the right tune with OERs. Looking back through his thread he had PHH 50s on there at some point - but that is a very built engine - 3.1 I think with custom head etc.
      Did a little more digging and thinking on this last night - I think mechanically the hardest part will be the common throttle shaft - it looks like each carb has 3-5 holes on the shaft. 2 for pins for to hold the throttle stop and accelerator pump levers; at least 1 maybe 2 for the return springs; and the main threaded one for the slide lift.  With some patience and precise measurements it’s shouldn’t be to terrible, but not a cheap if you mess one up and have to start over on a new stainless shaft.
    • https://www.instagram.com/p/Czs3Cpqys-Q/?igshid=NTYzOWQzNmJjMA==
    • For the sake of keeping this in the same thread. I found a little more info on the car in the photo- unfortunately it seems the owner passed away last year.
      But this post on hybridz says he replaced his Weber 45s and actually saw better gas mileage and great throttle response 
      “I decided to try my own setup with 6 HSR45 Mikunis. I had previously run Weber 45's.  I used the original linkage so that I could return to the Webers if I wasn't happy with Mikunis.  Because of the shape of my extracters I had to add some extensions as The bowl of carb 4 was hitting the exhaust.  Apart from that it was pretty straight forward with the carbs being quite straight forward to tune. The throttle response is very good and although I wasn't looking for it the mpg ismuch improved over the Webers.”
      This of course does not help my decision process… on one hand it says to me it works! But on the other hand it makes me wonder if I should do 45s? I do believe it was a “built” engine but to what extent I don’t know. 
    • Gave them a try - says they haven’t done a 6 pack on a Z. But need to follow up with a few questions 
    • This place might be worth a contact.  Looks like they sell a 6 pack of them.  
    • I’ll definitely keep everyone posted- and if I go with 6 I’ll probably start a thread on it so there is hopefully some long term info on it.
      really wish I could get in touch with one of the few people who have done it.
      But I’m thinking 6 42s should do it and hopefully be ok.
    • First I asked them about Mikuni jet compatibility; since I was considering using their jets instead of Weber and had been told mikuni jets would fit- the answer is no they wont
      “Mikuni genuine main jet cannot be used for OER products.
      2. Only Mikuni genuine Air Jet 40φ can be used for OER
      3. All OER Jet can be used for Mikuni”
      I had better luck with a quick response, responding back to that email asking if they had any jetting recommendations for an L28 as a starting point.
      To which they gave me the linked their product page and what jets come stock and said 
      “Jetting and other settings will vary depending on your vehicle, engine condition, climate, environment, and the features you require.
      Please enjoy the setting through trial and error!”
      I can’t really fault them to their response to the jetting suggestions but I had heard they could help. 
      So they is some communication there. Just not ideal- but also not too surprising considering the language barrier.
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