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Idea for better FMIC plumbing

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  • #46
    Originally posted by sambb View Post
    Just had the car in a thousand pieces doing a cam cover gasket and a timing belt. With everything more or less exposed I was able to run a tape measure over the intercooler pipework route for a SEAT Sport FMIC. The length of the inlet tract is 3.4m!!!! and that was a flexible ladies sewing tape measure to properly trace it and I measured the double pass turn around at the end tank of the IC as half its height. 50mm pipework (say 48mm ID) over that length comes out at 6153 cubic cm's. think that's right. That seems like a lot of pipe to fill. DV relocation helped big time for me but there's got to be a lot of lag in that.
    As always the maths is fun, a 1.8 litre engine (at zero boost) will consume the 6,153 cc's of air in around 7 revolutions of the crankshaft, at 6,000 rpm that's about 0.14 seconds. At 1 bar of boost that's 0.07 seconds etc. That doesn't seem very long but it's surprising how noticeable it is when driving, especially when controlling the handling via the throttle.

    Cheers
    Gary
    Golf Mk7.5 R, Volvo S60 Polestar, Skyline R32GTST

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