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Thread: 4.0 to GTS 4.4?

  1. #1
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    4.0 to GTS 4.4?

    I read that the bore is the same for both the M3 and M3 GTS motors....so what will you need to do exactly to convert the B40 into a B44? IMO i think it would be worth it for owners that are trying to stay NA, but what do you guys think?

    B40
    4.0L
    414hp
    15% loss = 352rwhp

    B44
    4.4L
    444hp
    15% loss = 378rwhp

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    Well, you need to change the rods and crank.

    They increase the stroke by 7-8 mm. Not sure what exact figure is because it was never released but it is one of those.

    You won't be able to get these parts from BMW to make your own GTS. If you do want to increase your stroke better to just do it aftermarket and get more displacement anyway with a more aggressive crank and some extra bore with aftermarket pistons.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

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    or put a S/C on it
    Current: 964 WB, 993, Panamera Turbo

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