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Old 01-14-2014, 05:41 PM   #1
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Default MSM Engine Managment

My brother is in the market for a new Miata and asked me to take a look at this one:
2005 Mazda Mazdaspeed Miata

According to the description, it has had some minor upgrades done to it, but what has me concerned is the blow off valve. Doesn't the Mazdaspeed Miata use a MAF based engine management? Is there some trick to preventing the engine from stumbling and going stupid rich every time you lift the throttle that I am not aware of?

My cursory google search for answers seemed to indicate that is was a common modification, and that rough running may be fixed by moving the MAF sensor. But even if this helps the idle, I don't see how it helps keep your AFR's from diving when you change gears...

is it worth looking at? I am concerned what constantly going that rich would do to the cylinders. I am also wary of other modifications that may have been done if the owner seems to not know what he was doing.
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Old 01-14-2014, 05:52 PM   #2
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I'm pretty sure that model of blow off valve can be recirculated into the air behind the MAF.
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Old 01-14-2014, 05:53 PM   #3
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I'd say that the BOV is less worrisome than the horrible lean conditions that the factory ECU causes in the first place.


Also: That's the FM intake kit. BOV will be set up for full recirculation.
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Old 01-14-2014, 06:10 PM   #4
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you want proper engine management for that car either way, the stock computer is terrible at best
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Old 01-14-2014, 06:12 PM   #5
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Tell your brother i'd be happy to sell him my MSM which has been modified correctly and doesn't need a new top.
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Old 01-14-2014, 09:41 PM   #6
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Quote:
concealer404 Tell your brother i'd be happy to sell him my MSM which has been modified correctly and doesn't need a new top.
I would be glad to, how many miles does it have and where are you located?
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Old 01-14-2014, 09:59 PM   #7
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I'm in Indy. Car has 88k on it, 2004. I can't take $8k for it though, so if that's the budget, it'd probably be better to not waste everyone's time.
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Old 01-21-2014, 10:35 AM   #8
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Concealer404, clear out your PM's. I want to talk
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