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Thread: Help on N/A Power Mod recommendations for NB1 Miata

  1. #1
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    Default Help on N/A Power Mod recommendations for NB1 Miata

    UPDATED the info below in RED .

    I am looking for power mod recommendations, Emilio's questionnaire is answered below. I'm hoping for 140 whp.

    -Autocross, what class? No
    -Wheel to wheel racing or HPDE only, what class? HPDE only
    -Street only? Street/track
    -Does it need to be emissions legal in any state? (what state) Yes, Houston Texas. Moving there soon, I looked up the requirements looks you can do anything but need to kep the CAT and a Yearly OBD2 test
    -Must it be able to run on pump gas and if so, what octane? Yeah 91
    -Must it run in a street car, (A/C, OEM alternator, col start driveability etc) ? All this yes
    -Actual budget for everything connected to engine/power making hardware? Enough, but i like value/$ lol
    -Tuned by a pro or semi-knowledgeable amateur? Pro
    -You cool with the additional tuning/set up hassles of an IRTB set up? No
    -Does the car need to be quiet? Yes
    -Do you have a shop in mind that is familiar with race BP series builds? No

    Car is a 99 NB1 (97k miles) w/ full suspension, racing beat Intake and the usdm NB2 header, I have been tracking it since I got it 5 yrs ago. Kind of want more power now.

    Given the information above Iím thinking of the following mods:

    Square top (just got it)
    BP5A cam (since I need to do a timing belt soon)
    Racing Beat Header (if I can find one or the jdm NB 4into2into1)
    Flying Miata Midpipe w/ Cat (looking for a good high flow cat, i've been searching but NB midpipes info is hard to find POWER FIGURES, anyone got a good recomendation?)
    Racing Beat muffler (debating about a corns b/c of a deal)

    MegaSquirt/tune (I believe it can easily be switched out for the yearly OBD2 scan)
    Innovate MTX-L Plus Wideband Gauge (has a Narrow band to swap over when i need the stock ECU)
    MAF DELETE




    Any recommendations to the above will be great, a do not bother w/ this part or get this instead would be greatly appreciated.
    Last edited by PeTeToTe; 03-13-2018 at 08:31 PM.

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    Senior Member bellwilliam's Avatar
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    You should be right around 140whp with that build (with CAT and muffler). E85 will add another ~7whp
    S1 Supermiata - 220whp
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    Senior Member bellwilliam's Avatar
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    But you wonít pass smog with the Megasquirt.
    S1 Supermiata - 220whp
    13 Tesla, ma: no engine !!
    17 GT350R
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    96 NSX
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    Senior Member bellwilliam's Avatar
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    Since you already have NB2 header, I say forget RB header, it will only net you few whp. And passing visual will be impossible.
    S1 Supermiata - 220whp
    13 Tesla, ma: no engine !!
    17 GT350R
    03 Miata Club Sport
    96 NSX
    06 EVO MR
    15 Mini Cooper S
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    You might also like to consider:

    Electric water pump
    Crank scraper


    No emissions/compliance hassles with these mods either.

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    I never noticed a shortage of info for anything NB related. I'd recommend the roadstersport midpipe as another option, I had one on mine for about 4 years or so with an older rs rear section. 2.5" and very quiet with an excellent tone. I've heard using an nb2 block will allow for some additional power as well. And don't forget about rotating mass. I went with an 949 1.6 clutch and lightweight flywheel.
    Last edited by eyeballs; 03-13-2018 at 05:30 AM.
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    JJ1
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    I thought the new trackhq standardized answer was... c5 vette. No?

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    http://www.trackhq.com/Banners/yellowsitesponsor.gif emilio700's Avatar
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    Emission legal = cat back and CARB legal intake. That's it. Around 130whp on CA91.
    Built engine will get you another 15whp but it's not really cost effective unless you are actually racing.

    You picked the wrong car and state if you want big emissions legal power.
    Last edited by emilio700; 03-13-2018 at 02:11 PM.
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    The Real Captain Slow Red_5's Avatar
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    Have you looked at the FM221 Ecu that fits in the box of the stock ecu? I guess a plug-n-play standalone wouldn't be difficult to swap out for Smog tests.
    99 Mazda Miata SuperMiata #515 - AKA Sparky SOLD
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    Quote Originally Posted by Red_5 View Post
    Have you looked at the FM221 Ecu that fits in the box of the stock ecu? I guess a plug-n-play standalone wouldn't be difficult to swap out for Smog tests.
    The FM221 is bascially another flavor of MS that fits inside the stock case.
    Still needs an aftermarket wide band, doesn't return OBD codes.

    Not really helpful in this situation, I'm afraid, except the mounting location.

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    The Real Captain Slow Red_5's Avatar
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    Quote Originally Posted by Schmoe Money View Post
    The FM221 is bascially another flavor of MS that fits inside the stock case.
    Still needs an aftermarket wide band, doesn't return OBD codes.

    Not really helpful in this situation, I'm afraid, except the mounting location.
    Oh yeah, forgot about the OBD2 stuff. It will trigger the CEL on startup then turn off on earlier cars which is what I have.
    99 Mazda Miata SuperMiata #515 - AKA Sparky SOLD
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    Good to know!

    How about if i'm only concern w/ keeping a CAT and swapping the ECU for OBD2 testing?

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    Thanks everyone for all the input so far, i'll look into the FM221.


    Quote Originally Posted by emilio700 View Post
    Emission legal = cat back and CARB legal intake. That's it. Around 130whp on CA91.
    Built engine will get you another 15whp but it's not really cost effective unless you are actually racing.

    You picked the wrong car and state if you want big emissions legal power.
    Good to know, How about if all i'm concern w/ is keeping a High Flow CAT and easy things like swapping back the ECU/MAF for the yearly OBD2 testing?

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    Pete,

    Since you'll need to swap ECUs anyway I'd recommend an MS3 over the FM221.
    You can pick one up from forums sponsors like 949 Racing/Super Miata, and Trackspeed too!

    The FM221 has it's advantages, mainly for folks who don't have to worry about OBD2.
    But if you're going to swap anyway, I wouldn't limit yourself to a small, boutique ECU that was made over the pond and only supported by one company here in the US.
    The Megasquirt family has thousands of more units out in the wild.

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