PZtuning and William Au-Yeung’s Record-Crushing RSX

PZtuning's RSX on track at Road Atlanta

William Au-Yeung is no stranger to extreme FWD performance, especially when it comes to Hondas. He and PZtuning (Point Zero), an automotive performance store and full shop in Canada, are also not strangers to setting Road Atlanta records, having completely crushed it at Global Time Attack at Road Atlanta in that same Unlimited class Honda Civic with a 1:19.509. They also brought their Limited class Acura RSX, proving that they’re no strangers to Acuras, either.

But this feat was almost not meant to be. At Super Lap Battle at Buttonwillow, after earning a 2nd-place finish in the RSX and securing the 2017 GTA Championship Pro Title, the car suffered an oil fire that fortunately only took out some of the vehicle’s wiring and other little things.

For 2018, PZtuning decided to attack the RSX, refreshing and upgrading it in the hopes of doing well at Global Time Attack at Road Atlanta. However, with the lion’s share of PZtuning’s efforts focused on their Unlimited Civic, the RSX was completed but didn’t even get a proper tune before Global Time Attack at Road Atlanta. William and the PZ crew used data logs from on-track laps to dial in the tune! Apparently it worked.


Will Au-Yeung
William Au-Yueng happens to be the talented wheelman behind PZtuning’s operation. But he’s not just that.

He’s also the fabricator and part-time tuner on the RSX. I’ve heard he’s also the cook and bottle washer. William has been actively track driving since 1997, and has been involved with competitive wheel to wheel racing in the past (2003/04 in an EG).


Crew working on engine bay
However, we all know that it takes a village and that very few shops or racing efforts happen completely solo.


    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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