The King of Speed, PZ Tuning's Amazing Time Attack Civic

By Mike Kojima

William Au-Yeung has been changing the course of history as of late, time attack history that is, with his amazing 2012 Honda FG4 Civic Si. Not only has William been dominating the FWD Unlimited class, but he has been taking the overall top times at GTA's Buttonwillow and Road Atlanta events.

William burned up Buttonwillow configuration 13 CW, the North American time attack standard bearer with an unbelievable lap time of 1:37.308 at GTA's Round One on March 2018. William followed up this amazing performance with a blazing time of 1:19.509 which is in the realm of IMSA GTLM speed and faster than the IMSA's GTD class, amazing speeds for a full unibody production based car!

Is the PZ Tuning Civic full of exotic technology? Is its body shaped with CFD and verified in a wind tunnel? Is it an untouchable works level effort? The answer is a resounding No!  The PZ team is pretty grassroots and the car is buildable and obtainable by people of reasonable means, like William!

Minutes before, William had just smashed the Buttonwillow lap record with a history-making time of 1:37.308. When we witnessed this run we were amazed at the speed the car displayed. We had never seen a car go as fast through the Bus Stop and Talladega as the PZ Civic. 

PZ Tuning's powerplant is a K24A2 originally from a TSX. The engine is not an all exotic monster but one built of pretty normal off the shelf parts that anyone can get, albeit high-quality ones.

The engine's list of modifications starts with the turbo system, which you cannot see unfortunately due to the K series engine having the turbo on the firewall side with the engine leaning back towards the firewall.  PZ Tuning built a custom 4-1 turbo manifold using fabrication parts from Vibrant Performance.  A huge Turbosmart IWG 75 external wastegate helps control boost pressure and a Turbosmart Kompact BOV helps reduce compressor surge. 

A Borg Warner EFR 9180 turbo is hung on the exhaust manifold.  We love the EFR turbos due to their advanced performance enhancing features like a low friction ball bearing center section, a lightweight titanium aluminide turbine wheel and an extended inducer tip compressor wheel in a surge reducing ported shroud housing. These features work to improve response and fight lag over conventional turbos while still flowing enough air to make the engines over 840 whp output. 

The engine's bottom end is put together with forged CP pistons hung on Brian Crower 625 rods.

The stock crank is used, nothing special. King XP bearings are used for the crank and rods. A Skunk 2 Ultra Race Intake manifold and throttle body are used to handle induction duties. 

The cylinder head was mildly ported by PZ Tuning and is equipped with Brian Crower camshafts, Brian Crower big valves, valve springs and titanium retainers. 

A Cometic MLX head gasket keeps the combustion pressure sealed and the head is held down with Speed Factory L19 studs.  Ignition Products multi-spark high output coils are used to keep the fire lit, even with high boost pressures. 

To keep the engine lubricated under high G loads which can approach 3 G's in some turns, a Hytech high capacity baffled pan is used with addtional modifcations for improved oiling by PZ Tuning. 



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Wednesday, June 06, 2018 5:50 AM
This is simply an amazing car! Amazing team! Awesome driver!
Well done.
Wednesday, June 06, 2018 9:46 AM
Love this car and watching battle between Will and James. Amazing aero for resources they have.
Big Red
Big Redlink
Wednesday, June 06, 2018 10:37 AM
FB6 is sedan, this is a FG4
Mike Kojima
Mike Kojimalink
Wednesday, June 06, 2018 1:08 PM
@big red, fixed it.
Wednesday, June 06, 2018 2:08 PM
So much carbon. Any left for F1 cars? I need to carbon my rear floor area too including the Gastank area.

Wednesday, June 06, 2018 3:28 PM
Will, if you're reading this, you should get some PC wiring nerd to clean up the wiring for you in the pic at the top of page 3
Johnny Mac
Johnny Maclink
Wednesday, June 06, 2018 9:12 PM
Very nice build.
Wednesday, June 06, 2018 9:37 PM
I'm impressed the wet-sump system (while improved) still works with that level of grip.
Mike Kojima
Mike Kojimalink
Wednesday, June 06, 2018 10:54 PM
@czubaka, me too!
Thursday, June 07, 2018 8:23 AM
Thursday, June 07, 2018 10:28 AM
great article. I'm also super impressed the wet-sump handles it! great read overall and thanks for sharing!
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