Porting the turbo on Bryson's 'Initial D' 1987 Mazda RX7 FC

This car pumps out 13.5 (or more) pounds of boost without any intervention from the turbo controller. I don't like that! So it's time to fix it. The spring cracks at 6 pounds and is all the way open at 10 pounds, so we must have inadequate waste. Let's tear into it!

[Go_Hojo]

Woo, more FC! Loving the path this car is taking!

[bookofjarom]

When Bryson returns from his church mission (hats off to him for dedicating these two years of his life to such a wonderful cause!), we gotta see a full, multiple-angle video of his reaction!

[typedrew]

If you can get a downpipe that incorporates a bellmouth right behind the gate so the flow isn’t a awkward 90 degree path to flow into the turbine exhaust stream I bet it would sort the last bit of your boost creep issue

Every old internal gated car I’ve done this with has resulted in massively improved boost control. With additional power as a side benefit

[ubeking]

Check out the bnr turbo upgrades-uses the oem turbo for parts. Extremely affordable comparable to precision/garett/holset($875 USD plus core and shipping). I'm running 10psi at 310whp(break in tune) with a streetport and other assortments.

[everzamora]

Now throw that s4 turbo onto the shelf. And get you the oem s5 one. And do the same thing. And watch the difference. It's going to be a peppy rotary for sure.