S30 strut-brace bars | Page 2 | The Z Club of Great Britain
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S30 strut-brace bars

Discussion in 'Zstory' started by SeanDezart, Jul 4, 2020.

  1. franky

    franky Well-Known Forum User

    I was on about the m3 engine! Its not about reading, its about having had a few in bits and measuring what they use as std.
     
  2. status

    status
    Z Club Member

    Thought you was on about our old Datsun lumps,
     
  3. status

    status
    Z Club Member

    Got an M 3 engine in my z4 m coupe
     
  4. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    My engine then : CFM = 3.1ltrs (189 cubic inches) divided by 3464 times max revs (7000) = 382......? A long way from 130cfm....!

    I've been advided to have a 120mm airtube to an airbox which ideally should be 5ltrs air per cylinder (so 30ltrs in capcity) or calculated by gross bhp / 10 ...so again, 30litres. Going to be complicated to get that much under the bonnet etc so we're going to settle for at least 20 ltrs from a custom-made box.
     
  5. franky

    franky Well-Known Forum User

    you're over thinking it all, otherwise engines like the s50b32 or the s2000 would be mostly airbox under the bonnet.
     
  6. Turn & Burn

    Turn & Burn
    Z Club Member

    Sean, re-read the post, its 130cfm per 100bhp, so your maths says that you’ll be at about 280bhp which seems to make sense
     
    SeanDezart likes this.
  7. SeanDezart

    SeanDezart
    Z Club Member
    Official Trader

    Ah yes, I would be expecting something the better side of 260, thanks.
     

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