1997 840ci sport (M62) - more power

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  1. 1997 840ci sport (M62) - more power 
    #1
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    VortexRing's Car Details
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    Hi guys, quite simply I'd like more power. Induction kit, chip (with limiter removed), new spark plugs and leads is the stage at the moment. Superchips are local to myself - has anyone used them? Induction kit wise, I'm looking at viper (friend has a lotus with one just kitted and quality looks good). Spark plugs and leads I'm at a loss - I've been informed that bosch are probably the best to keep in there. I'm looking at simple increases in power i don't want to start bolting on turbo's etc!

    Any recommendations would be greatly recieved.

    Many thanks

    Alex
     
     

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    not so much you can do with these engines. speak to smiles in the 8 series section, he's got an induction kit. i've got chips and k&N in mine, just waiting for new coils and leads, to replace broken parts.

    and that's about it. i reckon weight saving is the next best thing. felt the weight of the rear seats lately? AND you can't even get anyone in them. chuck 'em in the bin hey presto. 0.03 perceived bph increase, probably.

    infact, a diff change would greatly increase the perceived bhp. get a lower geared one. who ever does 186mph anyway?
    I once owned the greatest BMW ever.
    Neiljewell's 850Ci back from the grave project
     
     

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    ha! i have access to a runway anytime.....would love to!
     
     

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    Quote Originally Posted by VortexRing View Post
    Hi guys, quite simply I'd like more power. Induction kit, chip (with limiter removed), new spark plugs and leads is the stage at the moment. Superchips are local to myself - has anyone used them? Induction kit wise, I'm looking at viper (friend has a lotus with one just kitted and quality looks good). Spark plugs and leads I'm at a loss - I've been informed that bosch are probably the best to keep in there. I'm looking at simple increases in power i don't want to start bolting on turbo's etc!

    Any recommendations would be greatly recieved.

    Many thanks

    Alex
    viper are ok or cda are another good one, keep it an enclosed kit as these will make the most power, plugs just go for good quality, there is no gain in fitting so called performance ones, and arent they individual coil on plug on those engines?
    how many cats does your car have as i know ditching precats and replacing the standard cat with high flow ones usually works well with a full sports exhaust, top this lot with a good remap done on a rolling road and fine tuned live mapping on the road/track should see you some healthy gains
     
     

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    I would have said NGK plugs, they tend to be the factory fit ones from BMW, and most people are happy with them, and in cases have found other brands to be lacking a bit.

    As Mark says, there isn't much need to go for anything fancy, plugs either work or they don't, and as long as they work, you can't do much else.

    One little tip to try out is resetting the throttle, just switch the ignition to the run stage, and let it sit for 15-20 secs, and you'll hear the throttle plate swing open and closed and record the max and min settings.
    This will recalibrate the throttle to adjust for any wear in the position sensors over the months and years (you'll have an electronic throttle)
    It's not something you need to do every week, but once in a while, if you have a few seconds to spare, it won't hurt getting it bang on.
     
     

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    Quote Originally Posted by VortexRing View Post
    ha! i have access to a runway anytime.....would love to!
    LETS GO!!!!


    186 is more than possible in a de-limited 850, ask Talyinka he cruises autobahns in his.

    stopping is more of a problem! i think the brakes are lacking a bit.
    I once owned the greatest BMW ever.
    Neiljewell's 850Ci back from the grave project
     
     

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    Thanks for the infomation guys. I don't want to muck about too much with it but an induction kit is something i want, plugs and leads i'll also do. My brakes have been stripped and cleaned with black diamond drilled disks and pads with new braided hoses (M6 alloys although id like some alpines). Im also running a full stainless exhaust system with 2 racing/sport cats i got from a mate (racing team).

    Remap - maybe one day.
     
     

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    #8
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    a remap would get you the biggest gain and compiment everything else, much more than that you are going to be into some serious wedge
     
     

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    I don't mind the "wedge"
     
     

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