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Thread: This Is Why A JZ Manifold Cannot Be Used On A 7M

  1. #1
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    Default This Is Why A JZ Manifold Cannot Be Used On A 7M

    I've seen this question asked so many times and answered incorrectly just as many times so I thought I would put this together so I can just post a link and save everyone the time of repeatedly answering it.

    The JZ intake manifold will not and does not fit on the 7m, nor will the upper half of a JZ manifold bolt to the lower half of a 7M intake and here is why.

    The JZ lower manifold (right) is completely different from the 7M (left) in the placement of fuel injector galleys, bolt pattern, and runner/port shape.


    Another picture of the JZ (left) manifold and the different shape of the runners and bolt patterns from the 7M (right)


    I hear a lot of talk about welding a JZ upper manifold to a 7M lower manifold, please look at this before considering doing it.

    Here is a 2JZ (TOP) intake and a 7M (BOTTOM) intake. These are the top halves only.



    They look fairly similar right? Now look at a 2JZ gasket laid over the 7M intake.



    Not only are the runners in different positions, so are the mount points.

    This is the same JZ gasket laid over the lower runners of the 7M intake. Here you can really see how different they are.



    The last picture shows how far off they would be from lining up and that is more mismatch than any port job could fix. Not to mention that if you welded around the outside of the runners you would have no way to get in and weld the bridges between the runners. That would allow all kinds of F'ed up cross cylinder air flow and pressure gaps that would ruin the efficiency of the intake.

    If you absolutely have to have a FFIM then buy a legitimate one or have one fabricated for you. Either way it's not going to be cheap but do you really want your car to be built as cheap as possible? If you can't afford it, please please stick with the stock intake.
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  2. #2
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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    Props.

  3. #3
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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    Ive seen the welded flange ones.... Id hate to test how the velocity works on that lol

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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    FFIM on a 7m is purely a bling factor anyway. There was a guy running mid 9's with a stock 7m upper and lower intake manifold. We all know who he is. You can make power, and go fast with the factory manifold.

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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    Well put, OP.

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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    Stickied.
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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    Great input Mr. Bo. Thank you very much, very helpful info indeed.
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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    very good advice
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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    Seems like plenty of material for extrude hone...
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    Default Re: This Is Why A JZ Manifold Cannot Be Used On A 7M

    I agree, the FFIM is bling and easy on intercooler piping routing. If you look at the direction of air flow on the stock set up it is far more superior as it can evenly flow into the cylinder chambers from the top unlike the the FFIM where it goes in through the front and has to travel alll the way to rear.

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