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Thread: Question about Speed 3 into a sedan swap

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    Default Question about Speed 3 into a sedan swap

    Am I nuts to think it would be just cut/paste? My 2007 speed 3 is dying and I'd love to swap front body panels, engine, seats, interior bits, all onto a sedan but I fear starting it and finding out the car lines don't work with a sedan back and hatch front or something.

    What are your thoughts?

    I'd be looking for a true red 2009 sedan hopefully gt without a sunroof if you know of one at a dealership...

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    Default Re: Question about Speed 3 into a sedan swap


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    Default Re: Question about Speed 3 into a sedan swap

    Panels won't swap perfectly, you could trim to fit but it won't be direct bolt. Engine is tied to ECU which is tied to gauge cluster...might be tricky. You'd also need to swap exhaust/transmission/driveshaft/hubs/brakes.

    For once at least you're starting with a MS3 rather than an MZ3 and thinking about just dropping in an engine.

    What's wrong/dying on your MS3? You'll need almost all the mechanicals from the MS3 to do it, so if something is going, it won't do you much good.
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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by SomeGuy View Post
    Panels won't swap perfectly, you could trim to fit but it won't be direct bolt. Engine is tied to ECU which is tied to gauge cluster...might be tricky. You'd also need to swap exhaust/transmission/driveshaft/hubs/brakes.

    For once at least you're starting with a MS3 rather than an MZ3 and thinking about just dropping in an engine.

    What's wrong/dying on your MS3? You'll need almost all the mechanicals from the MS3 to do it, so if something is going, it won't do you much good.
    turbo, driver's side ds, door bottoms rusting out for starters. That's why I'd be interested in a clean 2009 to swap into, but thought it would make for a fun swap to do the sedan. I don't mind swapping the whole gauge cluster/loom with the engine in fact I assumed it would have to go. As you said that's the beauty of having an actual ms3 for the donor. I would get new driveshafts but at least would have a sedan to drive around as I got the parts since this speed likely won't last another year without something significant happening as is. 318k km at the moment.

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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by 2012mazda3hatch View Post
    Great thorough read thanks for the link!

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    Default Re: Question about Speed 3 into a sedan swap

    How do you insure something like that?

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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by m_bisson View Post
    How do you insure something like that?
    As a Mazda 3 sedan...

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    Default Re: Question about Speed 3 into a sedan swap

    Yeah, if you're interested in a lawsuit.

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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by m_bisson View Post
    Yeah, if you're interested in a lawsuit.
    For what? You are insuring the car...swapping in a different drivetrain isn't illegal.

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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by SomeGuy View Post
    For what? You are insuring the car...swapping in a different drivetrain isn't illegal.
    Well, what's the normal insurance difference between a Mazda 3 and a speed 3?

    If you're driving around with more power under the hood, you can expect to pay a higher premium. Your insurance might drop your coverage if you don't disclose the engine swap. And I'm guessing if you do disclose it, you'll be paying quite a bit more.


    Thats why I asked. It's not just "it's a sedan".
    @CloudPump any idea?
    Last edited by m_bisson; 12-02-2017 at 05:35 PM.

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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by m_bisson View Post
    Well, what's the normal insurance difference between a Mazda 3 and a speed 3?

    If you're driving around with more power under the hood, you can expect to pay a higher premium. Your insurance might drop your coverage if you don't disclose the engine swap. And I'm guessing if you do disclose it, you'll be paying quite a bit more.


    Thats why I asked. It's not just "it's a sedan".
    @CloudPump any idea?
    Having owned both a MZ3 and MS3...my insurance actually went down when I got my MS3 (same provider). As far as I can tell, it's treated as a trim level and not as a different car, so it's no different than owning a GX or GT, the only thing that plays into it is purchase price.

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    Default Re: Question about Speed 3 into a sedan swap

    I don't know how each insurance company would differentiate between an engine swap (n/a or turbo) and engine modifications. They could see it as one or the other based on their individual rules.

    Engine mods:
    Most insurance companies don't want to insure any type of engine modifications. If engine modifications went against their filed rules for refusing to provide/decline coverage then they could cancel the policy and try to get off risk.

    Worst case scenario is if you got into a claim and these modifications were not disclosed, they could cancel your policy for nondisclosure/material change in risk and in certain cases decline portions of the claim.

    Best to inquire if your insurance company will insure n/a to turbo engine swaps / engine modifications at all or shop around for one that does. Some companies are generally very strict around engine mods and some are not.

    You just need to be concerned about being covered in a claim and not being cancelled for misrepresentation (most companies won't insure a person like this for 3+ years).
    Last edited by Kiewan; 12-03-2017 at 09:47 AM.

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    Default Re: Question about Speed 3 into a sedan swap

    On the other hand...it's an OEM engine into the same car. It's not like it's an LS swap.

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    Default Re: Question about Speed 3 into a sedan swap

    Still... Better to get insurance sorted out first. Otherwise you might end up with a car that you can't even drive.

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    Default Re: Question about Speed 3 into a sedan swap

    Why waste time swapping the ms3 engine... just turbocharge the regular mz3 engine and even get forged pistons and rods

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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by m_bisson View Post
    Still... Better to get insurance sorted out first. Otherwise you might end up with a car that you can't even drive.
    Pretty sure it would fall under a hot rod class of insurance.
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    Default Re: Question about Speed 3 into a sedan swap

    Quote Originally Posted by m_bisson View Post
    Well, what's the normal insurance difference between a Mazda 3 and a speed 3?

    If you're driving around with more power under the hood, you can expect to pay a higher premium. Your insurance might drop your coverage if you don't disclose the engine swap. And I'm guessing if you do disclose it, you'll be paying quite a bit more.


    Thats why I asked. It's not just "it's a sedan".
    @CloudPump any idea?
    There's a fine line here, you're going to see the word "Technically" a couple times.

    Technically insurance companies won't insure vehicles "customized or modified for speed"

    Technically you should disclose to your insurance company that you're replacing the engine.

    You don't technically have to say "I put in a way more powerful engine" into the car. You could just say that "The old engine went bad and we put in another Mazda 3 engine" which would be technically correct.
    If a serious claim were to come up, you could technically plead ignorance and say that you just needed a running engine and this one fit.

    Side note: "Running around with more power under the hood" doesn't really jack up insurance rates. You are required to obey all traffic laws and safety requirements when operating a car. If you are intentionally doing something wrong/stupid you don't technically have insurance. (Good luck proving the intent to do something wrong/stupid though)

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