PZtuning and William Au-Yeung’s Record-Crushing RSX
RSX driving on track
Even with popping the transmission, the RSX at William’s hands managed a 1:30.4, which was not only good enough to take the LFWD lead, but also the LFWD record! Who needs 2nd gear anyway?

But PZtuning and William wouldn’t stop there, even though their 1:30s run wouldn’t count.

That’s right – the passenger-side window was not down, per the rules. So the team panicked and decided to take the RSX back out for another go. In an effort to prevent any more transmission failures, the lowest boost setting was used. In spite of the lack of power, the tires continued to get better throughout the session. With things going OK, William added some extra boost and ticked off a 1:28.5 – just over a half second from the Overall Limited Record!


the PZtuning crew and team
Victory tastes sweet.

As we said before, it takes a village, and (left-to-right) Ryan Kulafofski, Alex Vongnhay, William Au-Yeung, Noreen Au-Yeung all work tirelessly together to get it done. And get it done they were about to… do.

With one session left, PZtuning decided to go for broke (and hopefully not the car). “one lap, max boost, full send it,” says William. And send it he did, with the rear side stepping here and there, including an almost full sideways moment through turn 12! Crossing the start/finish, the clock showed 1:27.745. Not only was the time a new Limited FWD record, it was a new Global Time Attack Overall Limited Class record at Road Atlanta! William, in yet another chassis, had beaten the RWD and AWD cars, again.

Global Time Attack has given shops a place to compete on design, fabrication, and engineering in an era when an increasing amount of homologation and standardization has almost all but eliminated “building” cars. When road racing means ordering a GT-spec car from a catalog, today’s generation of Smokey Yunicks, Brock Yatess, and Carrol Shelbys find themselves not racing door-to-door, but toes-to-timer. Perhaps William Au-Yeung is our generation’s version.


    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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