Cold air intake tips for S30Zs - the CRX solution... | Page 2 | The Z Club of Great Britain
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Cold air intake tips for S30Zs - the CRX solution...

Discussion in 'S30 (240Z,260Z,280Z) Tuning & upgrades' started by richiep, Mar 5, 2019.

  1. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    Depends what happened next.....strike 1, strike 2....

    I have the variable legth Emerald trumpets (thanks Pete and Steve) so will be getting it all just right with my Efi.
     
  2. richiep

    richiep
    Z Club Member

    DOH! thanks for the correction Pete! This is going to sound like an “oh yeah, pull the other one” moment, but I did know that - not sure what I was thinking putting it the other way around above... being a dumbass I suppose!
     
  3. johnymd

    johnymd
    Z Club Member

    My v8 lexus engine in the red car has active variable trumpet lengths, as do a few bike engines. It is pretty crude but basically the long trumpet (12" long) are used up to 4k revs to give high torque and then over that an air valve lifts these trumpets out of the way and it then just leaves short (1" long) to give maximum power and unrestricted air flow. On the 300hp lexus engine it still only make a small difference with the 12:1 ratio in length. On a zed engine I'm not sure that you would actually "feel" much difference so probably not something to get hung up about. The trumpet entry point shape is probably more important along with removing any ram air effect by diffusing the air as it enters the airbox. If you look at well designed air boxes then you will notice that air often enters under the trumpets so there is less preference to the from cylinders. The old ford cosworths, Datsun s2000 and reveire zolder are good example of a well thought out design. I'm not saying I don't like the design your using Richie as it has lots of good design features and also has to fit the engine bay plus keep away from the hot exhaust. It is probably the perfect option for a zed based on value for money. I would probably chose the zolder but at £600 it's a big step up in price for probably very little extra performance.
     
  4. franky

    franky
    Z Club Member

    They’ve more or less stopped using them on bike engines as a rule, there was a report somewhere that when over the 220bhp per/ltr (n/a) then they can help with how the torque curve is shaped. There’s also been variable height injection etc, which is amazingly cool to watch.

    Looks like a tidy install, bet it sounds nice also.
     
  5. jonbills

    jonbills
    ZClub Administrator
    Staff Member

    Here's a dyno pic from 2012.
    One of the big differences between the red run and the black run is that black has the air box on.
    DSC_0204.jpeg
     
    atomman likes this.
  6. Woody928

    Woody928
    Z Club Member

    Well the proof is in the pudding, amazing what a fibre glass box and a couple of ractchet straps can do!
     
  7. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    What filters did you have on before Jon or none at all ?
     
  8. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    There are other factors involved than 'merely a cold-air intake. In an airbox, air-flow is stabilised but there are also advents of retaining mousse 'sock' over the trumpets to further stabilise/equalise airflows into the inlet pipe.....
     
  9. jonbills

    jonbills
    ZClub Administrator
    Staff Member

    That was pre ratchet straps. They're worth another 100bhp :D
     
    Woody928 likes this.
  10. jonbills

    jonbills
    ZClub Administrator
    Staff Member

    For the red dyno run, the lid of the air box was off, so no filters (but ram runes were there)
    Before I had the airbox I had trad K&N filters.
     

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