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Thread: Upgrade FMIC?

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    Question Upgrade FMIC?

    I will be getting my 1M in October and was wondering if you guys could help me out with something. I won't be tuning the car right away so do you think I need to upgrade the FMIC? If so, which one is the best? Which one keeps the IATs down but at the same time will not cause a loss of boost? Help, Im a noob with the N54.
    ​#Chuckstrong

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    If the FMIC isn't an upgraded unit to begin with then yes. No matter though the aftermarket will have a better solution. One the guys here who knows their FMIC's will help you out.

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    few questions:

    how far do you plan to go with the car? upgraded turbos? tune only? FBO? etc.

    once you have a goal then choose the intercooler that'll best suits it. you say you want little to no pressure drop, or the same amount as the stock i/c. no aftermarket i/c can provide that being they all have larger cores. you can get a small unit sure, but if down the line you plan on going for more power the unit you bought will not be able to flow for those numbers you want. so its best to choose the unit that best suits your goal, instead of having to buy another, better one and sell the one you have.
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    You can reduce the pressure drop... CPE shows a significant drop and I'm sure others will too, but it's not well documented. There is give and take between cooling efficiency and flow of course.

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    if it shares all the engine components and relatives with Z4 35iS, then you don't have to upgrade since the FMIC in 35is is an upgraded version and from what it seems, it's a good one.

    BTW is it necessary to change the FMIC in my dad's 740i? the temp has been a tad high in this summer so i thought i should upgrade it with 750i's to be in safe side.

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    OP, remove it and take a picture... or at least one from under the car. I'm curious.

    EDIT: same part # as the 335 according to real oem
    Last edited by JoshBoody; 08-29-2011 at 02:29 PM.

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    I'm interested in this for the d, as well. The primary tune I use has access to the Boost sensor as well as the ECU, so I'm thinking that the car would benefit from a better FMIC, and allow higher boost #'s....thoughts? And options? This is a shady area for me. Click here to enlarge
    Click here to enlarge

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    Click here to enlarge Originally Posted by JoshBoody Click here to enlarge

    EDIT: same part # as the 335 according to real oem
    that's odd. the N54T in Z4 35is and 335is has different cooling components, but all the part numbers according to RealOEM are the same as N54 cars.

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    RealOEM is incomplete.
    I was at the dealer last friday. He checked for performance brake set/disks.
    He had like 9 screens.to choose from, including performance rear disk screen. RealOEM has 3 screens, which yes, are also in the dealers info. It is just missing the rest of all the newer information.
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    Click here to enlarge Originally Posted by DavidV Click here to enlarge
    RealOEM is incomplete.
    I was at the dealer last friday. He checked for performance brake set/disks.
    He had like 9 screens.to choose from, including performance rear disk screen. RealOEM has 3 screens, which yes, are also in the dealers info. It is just missing the rest of all the newer information.
    Pretty interesting. I wonder why we can't get a screen like what the dealer has.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    I wonder why we can't get a screen like what the dealer has.
    if you knew what is wrong with your car and get every details about parts, would you still go to dealer?

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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
    if you knew what is wrong with your car and get every details about parts, would you still go to dealer?
    For warranty work, absolutely.

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    HPF has the highest cubic volume of the non stepped designs and also very nice core and cast end-tanks that should allow for great heat exchange and low pressure drop. Plus it has welded on mounting tabs that bolt to your car, very solid intercooler.

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    I think I am leaning towards AMS or cp-e. Anyone have any experience with these?
    ​#Chuckstrong

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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    HPF has the highest cubic volume of the non stepped designs and also very nice core and cast end-tanks that should allow for great heat exchange and low pressure drop. Plus it has welded on mounting tabs that bolt to your car, very solid intercooler.
    you sure? i thought the largest non-stepped was AA's.

    Click here to enlarge Originally Posted by KB Click here to enlarge
    I think I am leaning towards AMS or cp-e. Anyone have any experience with these?
    curious why you narrowed it down to those? also remember cp-e's version you get the additional oil cooler, i think a member here is selling his. trevor right?
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    Helix also makes a very good Intercooler, fits 100% every time.

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    Another Factor that is pretty sweet with the HPF unit is its C-Clip design, which makes for an easy installation and easily reversible should you ever have to put your car back to stock!


    Which unit is better I think boils down to budget, and function (what's most important for buyer, price, installation ect) they all have pros/cons.. .just depends on what your looking for

    If have any questions please feel free to shoot me an email, I've sold quite a few inter-coolers and we have installed a vast majority of these units so I can give you a pretty good unbiased opinion.

    Good luck!

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    Too many choices...I give up!
    ​#Chuckstrong

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    Click here to enlarge Originally Posted by oddjob2021 Click here to enlarge
    you sure? i thought the largest non-stepped was AA's.
    What are the AA's dimensions?

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    Click here to enlarge Originally Posted by KB Click here to enlarge
    Too many choices...I give up!
    No need.
    To answer your first question: there are only few FMIC that will do just that.
    As soon as you enlarge the FMIC it will introduce more lag, especcially if you do not compensate with another tune.
    The FMIC would normally not be the first component to upgrade.
    But if you do, one of the choices for better performance with no lag penalty would be the Forge FMIC. All aluminum, same size as original. They claim a cooler IAT of 15 C.
    From there on the FMIC's just grow bigger. Next step would be the Wagner Tuning, or in the US the Helix FMIC.
    They are stepped FMIC's which require no cutting to the innerside of the bumper. They are adequate for engines up to 450 BHP.
    They are about 4l. bigger than stock. This is equivalent to adding about 4ft. of tubing between the engine and FMIC. Space the turbos need to pressurize before the air reaches your engine, so they already introduce lag.
    From there on lag just gets worse as the FMIC's get bigger. Unless you help the engine with DPs which will help the turbos to spool up better.
    Most big FMIC's claim they can support upto 600+ BHP. A number an N54 is never gonna reach unless there is a single turbo setup with the long awaited fueling rail option available.
    But if you go for show, one of the big FMIC's is the way to go. That will require some cutting.
    That being said, for cooling purposes bigger is always better depending on the climate you live in. Deserts are hot places, so maybe you want to live with the lag for better performance. Living in Canada, I would not buy a very big FMIC...
    Just my Click here to enlarge
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    if you want something better than oem that does not require modding get the 5'' ETS . Anyway anything is better than stock.
    07 335i AT - MOTIV 750 - MHD BMS E85 - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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    Click here to enlarge Originally Posted by enrita Click here to enlarge
    if you want something better than oem that does not require modding get the 5'' ETS . Anyway anything is better than stock.
    Forgot about ETS. This FMIC is similar to the Forge FMIC.
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    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
    What are the AA's dimensions?
    17 wide, 11.7 tall, 3.5 thick
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    Click here to enlarge Originally Posted by oddjob2021 Click here to enlarge
    17 wide, 11.7 tall, 3.5 thick
    AA - 17x11.7x3.5 = 696cubic inches

    HPF - 20.25x5.75x7 = 815cubic inches

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    guess i was wrong, cool beans.
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