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Old 11-05-2020, 08:29 AM   #166
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Join Date: Jan 2005
Posts: 192
Default Re: WQ Fiesta XR4/ST150 with Mazda SP25 engine

I had a brief chat with an Engineer out going 2.3L. It still requires a certificate but it doesnít require all the testing of things like brakes etc.

Personally Iím keeping a lazy eye open for a 2.3. Then it will either have a piggyback cam controller or Iíll have to disable the VVT. Itís my ďif it popsĒ plan.

Thatís a two two stage trick with a non-VVT cam gear required as well as a blanking plug in the head. The stock 2.0 ecu and injectors have sufficient latitude to run the 2.3, but the 60mm throttle body would be handy ;)

I keep thinking about the gearbox though. Mazda G35M-R and G36M-R (5 and 6 speed respectively) seem to look a bit more fitment friendly than the MTX75. In particular the end housing that has to work in the same space as the frame (even on an IB5).
Aaron is offline   Reply With Quote