E36 325 BMW 325I M50 no rev limit??
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  1. #1
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    BMW 325I M50 no rev limit??

    Hi all,

    Just come back from a test day with the race car, testing a few bits before the next outing, mainly my new 3.91 LSD diff

    However, strange side effect i have found is that it revs of the rev counter, i.e past 7000rpm??

    I never pushed it that hard before, but as it revs so quick its hard to keep it below 6.5k now.

    Its a 2.5 Non vanos M50 that i beilieve has been chipped in another life...... could this have raised the rev limiter?

    I know for sure they are 6 cylinder clocks, will m3 ones fit (that have an 8k rev gauge) so i can see where the limit is?

    Cheers guys

    Lloyd

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    yeah, very easy to do.

    my remap was raised to 7350rpm but the skies the limit - till the engine blows!

    i've actually edited mine and lowered it back down, it is now at 6900rpm.

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    Chipped it sounds like it has been!

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    Lloydie123 (21-08-2012)

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    this is mine and my mates car with remapped 7350rpm

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    Lloydie123 (21-08-2012)

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    Thanks guys, i think i will swap in some clocks from a breaker i have bought. They are M3 clocks, it would be nice to see were the limit is.

    P.S id recommend the 3.91 to anyone with a track/race car 117 mph max is all you need

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    Quote Originally Posted by Lloydie123 View Post
    Thanks guys, i think i will swap in some clocks from a breaker i have bought. They are M3 clocks, it would be nice to see were the limit is.

    P.S id recommend the 3.91 to anyone with a track/race car 117 mph max is all you need
    That has certainly killed your top speed...

    Didnt notice that the M3 clocks went up to 8k and standard is only 7k?

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    Yeah, its defo been chipped, my E34 has been and I had the red-line raised to 7k The roar is amazing at 6.5


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    There is a limit to how much you can raise the rev limit. If it is too high i.e. then you will have a problem with pistons slamming into valves and busted engine. Mine was raised to just over 7000. You can raise the limit even more if you go into very expensive territory and you won't see any gain. I believe shrick do something which does something which means the valves won't clash with the pistons....still I don't know what the point of that is except to have a way higher than necessary rev limit..............

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    A bigger bang, or more bangs per minute, that's the old adage about engine tuning.
    The faster an engine can run, the more air and fuel it can burn, and that's the reason why F1 cars and motorbikes have more power from engines that aren't all that big.
    For the majority of engines though, power starts to drop off before the rev limiter as it simply can't get the ever increasing amounts of air into the engine.
    Bigger valve and ported heads would help, but that's a lot of money, especially compared to the "bigger bang" method, such as turbos or just a larger capacity.

    On regular engines, increased rev limiters are there for fun, and they also give the possibility of avoiding a gearchange if you are coming in fast to a corner, and your options are pause for a second to change gear, or bounce it off the limiter for a short while until you go back on the brakes, or at least slow down.

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