Originally Posted by KC native
I should have been clearer. Heat soak is a terrible problem with the Speed3's. If you want to keep the power consistent and you have been making modifications, then you have to go to the FMIC for them.
Also, the Speed3's go boom if you don't upgrade the fuel pump when making mods. Autotech sells a kit that uses the existing fuel pump's shell and basically replaces everything inside of it. If you don't upgrade the fuel pump and you start boosting the PSI on the car, you will destroy your motor.
I've spent a ton of time researching what I want to do to it. Fortunately, there are a couple really active Mazda forums with plenty of guys willing to post mod lists and dyno sheets.
I'm also not worried about Dyno expense. I have a college buddy that owns a tuner shop.
And that heat soak comes from the ambient temperatures inside of the engine bay, not necessarily by its design, but placement. Even then, there are ways around it and it isn't truly dependent on the mods, rather than the tune and the driving. If you tune for lower EGT's like a DSM, you'll cut the power loss through heat dissipation by at least 60% on a TMIC.
Also, that bit about the fuel pump is inaccurate. The MS3 isn't going boom because of a fuel pump, it is going boom because owners aren't knowledgeable and paying enough attention to what counts. Tuning. If you watch your duty cycle, AFR, Timing, and Knock, you'll never go "boom" but you'll surely see tangible information at your fingertips of you overextending the limit of your current fuel pump. Also, one of the first upgrades on the list of any turbo car is an upgraded fuel pump when you decide to up the boost, that one is a no brainer. You can't just add boost and make more power. You have to add fuel and add or reduce ignition timing, sometimes even drop to a 1 step colder plug to compensate. Literally everything you touch on a car, alters the tune and AFR one way or the other. That kit you are talking about, isn't upgrading the internals of the pump, its actually utilizing the factory "hat" so that the system is plug and play (it isn't really a shell, but utilizing something already made with their application, huge difference), or minimal alteration to the unit until the major companies can get through the R&D to produce their versions. The marketplace takes time to grow like that, and in some cases companies will refrain from producing parts for certain cars due to their design and the cost for them to make an applicable product.
As for your tuning hookup, there you go, for you that 1300 mark is going to be more like 650-750 bucks