I just bought a 280Z in California ! | Page 3 | The Z Club of Great Britain
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I just bought a 280Z in California !

Discussion in 'General' started by SeanDezart, Jun 7, 2020.


Which wheels please ?

Poll closed Oct 7, 2020.
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    4 vote(s)
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  1. jonbills

    ZClub Administrator

    You should probably start your own thread, but I do think your premise that you can compensate for greater air flow on an EFI engine by fitting bigger injectors is flawed.
    TBH I suspect a change of air inlet routing and exhaust manifold won't significantly change the amount of air the engine flows and so you should leave the EFI stock.
    M-j-b likes this.
  2. SeanDezart

    SeanDezart Well-Known Forum User

    Are you changing the cast manifold? I read there isnt much difference between the cast L28 manifold compared to replacements (weight maybe?) And a little better flow via separate pipes.. ?

    Well, I have to change it since I produce stainless-steel versions, along with the line. Of the two that I know to have been dyno-ed, both returned 160bhp at the flywheel compared to a stock factory-new figure of 140 but more importantly increased the low-down torque and advances it by 500 revs !

    The remainder of the engine is stock, even the air-intake for the moment.

    Finally a stock euro front lip fitted.

    Attached Files:

    Mark N likes this.
  3. Mark N

    Mark N
    Z Club Member

    Increasing the exhaust flow is probably the easier of the two, with just a manifold and system required.
    Fitting a cold air intake will not make that much difference.
    The inlet is then restricted, firstly, by the AFM followed by the runner size on the plenum.
    If you just run larger injectors, the OEM ECU will just dump fuel at a fixed ratio of the old:new injectors.
    If you really want larger injectors, a stand-alone ECU is the best way to handle fueling and an aftermarket fuel rail with FPR will give you a larger choice of injector sizes.
    M-j-b and jonbills like this.
  4. SeanDezart

    SeanDezart Well-Known Forum User

    Agreed - if you want to improve the induction - you MUST upgrade the ECU.

    Personally, I would do the minimum of upgrades*, enjoy as is and see over time how (and if) you want to improve the power.....you might just want to fit triples instead !

    *brakes, suspension, diff ratio, lightened flywheel ie all the things that improve the drivability and would need doing if the power was increased and won't need doing twice if you do decide to uprgade the engine !
    M-j-b likes this.

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