PZtuning and William Au-Yeung’s Record-Crushing RSX
Hasport K-series engine mount
When it comes to ensuring that all the power generated by the K-series mill meets the road, Hasport comes to the rescue via its motor mounts.

But it still requires a competent drivetrain behind the motor and those mounts. The RSX transmission is actually a hand me down from the Civic, featuring a mishmash of gears from Albins, GearX, MFactory and an always-dependable OS Giken SuperLock differential. Motul Gear 300v 75w90 LSD gear oil keeps everything appropriately lubricated.


Hondata ECU on firewall
A Hondata K-Pro v4 ECU is the brains behind the operation – well, the engine’s brains at least.

Sasha Anis from On Point Dyno is usually the tuner but William has handled the tuning duties on the record-setting RSX at the track. The K-Pro is used not only for engine management but also for boost control, from the 16 PSI wastegate setting all the way up to 22 PSI at maximum boost.

Usually an AiM Solo DL is used for track performance datalogging, pulling engine and other parameters from the K-Pro. Unfortunately, the AiM Solo had recently broken, so William was using his built-in data logger (brain) to watch the A/F meter and remember what changes to make after the laps.


Hondata Traction Control unit
The traction control unit is tied in with the Hondata K-Pro ECU and monitors wheel speed via the factory ABS sensors. If it detects slip, it intervenes via the ECU and certain adjustable parameters.

William and PZtuning are one of the first time attackers to make use of this traction control unit, and William has custom tuned it to work for his needs.


PZtuning RSX cabin
For a car that gets around so quick, one might be surprised at how simply modified the PZtuning RSX’s cockpit is.


    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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