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Thread: What about 40's?

  1. #1
    Resident Wino Zvoiture's Avatar
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    Default What about 40's?

    Yes, the world's biggest FI fan is starting a thread on carbs...get over it! It is out of necessity.

    I am curious what a Z runs like on triple 40 dcoe's or Mikuni's. I've been around and in quite a few cars with 44's and 50's, so I have a pretty good idea of what THAT is like. Several people have told me not to consider anything under 44. I never realy had paid attention to anything under 44 before, and now that I have started shopping, have discovered 40's are quite plentiful and reasonable. I know without dyno charts, this is an extremely subjective conversation, but am hoping to glean SOME sort of input. What is the performance gains--if any--of triple 40's over twin round-tops (stock or re-worked). Sound, feel, top/low end......?

    steve77
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  2. #2
    Registered User gramercyjam's Avatar
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    Default

    Here's my thoughts on it. It depends on what you are going to do with the car. Since Solo II rules for an FP 240Z limit carb size to 45mm, that's what you go with. If you are driving competitively and don't have that limit (such as some track cars and other non-stock Solo II classes), and you have the budget for the bigger carbs, bigger is better. If you are not driving competitively, and are just going for a quick street car with the triple bling factor and sound, 40's will do just fine. Quite a few "experts" say that triples aren't worth it if you don't have a hot cam and a lot of head porting, and of course all that helps, but just going to a 2 1/2" exhaust with a good flowing muffler will really bring the triples to life and you can notice a substantial increase in power over twin SU's throughout the RPM range.
    --John B
    '73 FP 240Z

  3. #3
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    Default Well Ill say this

    They look great sound awesome and are a nice addition to any engine bay.

    Now if you dont have the cam and head work needed to use them your one, throwing your money away and two, wasting gas. At the same time as with the prior post, you will get more out of the triples, but why spend the money for a small gain.

    Its the same with an FI engine, you dont need more fuel or larger injectors unless you have more engine to use it.

    On another note, the su's can be made to put out great power as well. Point in fact is on person I know thats running 12's in the 1/4 with a 2.9 dual su motor.
    Last edited by ZmeFly; 11-18-2003 at 02:50 PM.

  4. #4
    Resident Wino Zvoiture's Avatar
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    Default

    Thanks, guys....Yes, I failed to mention these would be going on a fairly modified motor. At LEAST built to the limit of ITS and possibly on something a bit hotter. Of course, bigger is better, but what I think I am hearing is they are just about equal to a well-worked set of SU's. Agreed?

    steve77
    "Auto racing, bull fighting, and mountain climbing are the only real sports ... all others are games." -EH
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  5. #5
    Registered User gramercyjam's Avatar
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    Possibly. But I didn't think triples were allowed in ITS, are they?
    --John B
    '73 FP 240Z

  6. #6
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    Nope, no triples allowed in IT or EP in road racing. The only class they would be allowed in would be GT or SP.
    Solo is a different matter, but the lower classes only allow stock induction, so you'd probably have to go into a Modified class.
    "If it weren't for fools, the rest of us could not succeed." Mark Twain.

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