PZtuning and William Au-Yeung’s Record-Crushing RSX
PZtuning K20A2 engine view
At the heart of the Vibrant / PZtuning RSX is tastefully built but stock-displacement LA Sleeves-equipped K20A2.

The motor was refreshed and upgraded as part of the 2018 build, and CP Pistons attached to Brian Crower 625 rods handle the squish, spinning on King Racing Bearings cradling a stock honda crank. Brian Crower springs, valves, and retainers ride the bumps on stage 2 Crower cams when it comes to the suck and blow, fed and evacuated by a PZtuning in-house custom-ported head. A Cometic MLX head gasket is compressed by ARP head studs which ensures that the combustion gases stay separate from the coolant and lubricant. Motul 300V Racing Oil ensures that things move smoothly.


Turbo behind engine near firewall
Hidden behind all of the heat shielding is a new Borg Warner EFR 9174 turbocharger.


PZtuning twin wastegate turbo manifold
A twin set of 16PSI spring-equipped TurboSmart HyperGate 45s are employed as a part of the boost control system.

This new PZtuning-redesigned turbo manifold is assembled from Vibrant Performance fabrication components and guides the hot gas away.

While the engine management system controls the HyperGates to ensure that the appropriate amount of boost reaches the combustion chamber, a TurboSmart Kompact blow-off valve ensures that the boost doesn’t beat the heck out of the throttle body or compressor.


Downpipe viewed from wheel well
Here again, Vibrant Peformance components come together via PZtuning’s hand in the downpipe section of the exhaust, terminating in titanium-spec Vibrant Performance exhaust components.


    1. Lol, that’s where those spacers are … now I remember, needed them for the ZE40’s (they’re actually 24 offset, and minus 3mm for the spacers, so 21 offset). We usually run 57FXX’s that are 22 offset (and no spacer)

  1. You guys did an excellent video + article on fixing the EP3’s steering issues. Did they do any similar work on this car? I imagine they had to.

    1. All we have in our steering rack is a custom rack slider (which we had made), otherwise its all oem steering gear in it.
      That being said I’m sure there’s room for improvement there in this car – we actually retired the RSX in 2014 and have been slowly bringing it back up to competitive form, so we’ll keep developing it as we can!

  2. Well, you’ve got a lot of development to do. Here’s some freebees.

    Honestly, I don’t know why I bother, but whatever…when I get back on track, it will make the competition interesting.

    First of all..

    Why do you have the stock radiator mounting core? this is a freebee. but if you have hood locks, you don’t need all that shit, cut it out…save some weight, i did it on my car.

    bumper support? worthless…drop 20 lbs, right there. another freebee.

    Not the greatest cage…but, maybe your spring rates are not high enough?

    Factory crash bars? worthless 10 lbs.

    You got your spring rates all wrong, on on FWD, you run soft fronts, and stiff rears. Don’t need sway bars, for the rear, either. Run some neg camber, and some positive caster, and you’re golden on a Mac-Strut. Saves weight, too.

    If you had a ‘proper’ splitter you would be able to use those soft front spring rates to your advantage, because under brake dive you would get more grip. But, you need to have a front diffuser/splitter to do that. Which, obviously, you do not have, otherwise you would not have such a huge front splitter because you don’t need it because a front diffuser makes much more downforce, and far more efficiently. Look it up, on LMP1 cars.

    Wank, rear wing should be mounted to the rear frame rails. Period.

    Rear diffuser is beyond basic. For one, double decker. Secondly, lateral diffuser. Third, blown diffuser. If you know racing, you shouldn’t even have to look those terms up.

    Wank, lame side skirts. How about sliding skirts, FTW…maybe you can catch up to 1980’s F1 technology. Or are you that slow?

    Horrible front bumper design, you should have radiused inlets, obviously.

    1. You don’t need a double deck diffuser if you have enough room to make a large one. Also the golden rule of all things aero: you design to the rule set. Just because something is “the best” in one series of racing does not necessarily make it correct for another series.

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