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2006 Honda Civic Si - World Warrior

Canadian-built race car takes on the globe in Pirelli’s World Challenge Series.

Joey Lee
Sep 21, 2011

The ongoing argument regarding “function” and the proposed functionality of parts has gotten a little ridiculous as of late. Road race and time attack events have increased in popularity, spawning a devout following within the motorsports crowd, and even influencing show-goers in search of that “track/race car look.” Many of these track-inspired builds never see any actual race events, which in turn has produced a legion of online anti-hard-parkers. This dedicated group carefully stalks any possible offenders and is quite vocal about race parts being used correctly, oftentimes demanding photos of the car in question on track. The irony in this parasitic relationship is that the ones who complain the loudest often have never built, driven, or even sat in an actual race car. Nevertheless, there are a number of show car builders who do make the transition and beat on their cars at the track, helping to up their street cred, warding off antagonists…for a little while at least.

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There are show car guys turned weekend racers, haters who disguise themselves as the function police—and then there are those who care very little about the two sides because they’re far too busy building actual race cars. These guys have better things to do than worry about petty online debates over who does or doesn’t attend track events. It’s no coincidence that this is the annual Race Issue and we’re bringing you a magazine full of abused track vehicles. Don’t get it twisted, we love bringing you the best of the best in Honda street cars and show-quality builds month after month, with a taste of race vehicles in between. However, this month we’re not worried about wire tucks, wheel fitment, custom paint, or JDM parts. This ’06 Civic Si has none of your usual aesthetic add-ons. In fact, with the exception of the graphical livery, the exterior of this is as plain Jane as it gets. It retains the original factory appearance because it has to. The purpose of this Civic’s existence is to take part in the Pirelli World Challenge, which is a North American racing event sanctioned by the Sports Car Club of America (SCCA). The Touring Car (TC) class that the Si competes in places heavy restrictions on engine size and drivetrain, as well aerodynamic modifications. One of the main restrictions being that the body must retain its OE configuration, meaning no aerodynamic enhancements of any kind. This places a larger emphasis on handling and suspension upgrades, and of course driver skill.

2018 Honda Civic
$18,940 Base Model (MSRP) 28/40 MPG Fuel Economy

“We picked up this Civic from Lombardi Honda earlier this year along with the contract to race it in the ’11 World Challenge Series to analyze the effectiveness of overall build costs versus the prize money won from the event,” Patrick Seguin, owner of Segs Motorsport and pilot of this ’06 Civic, explains. “At the time we first picked up the car it was equipped with a K24A2 that made just under 300 whp, and had custom front and rear aero upgrades. The transmission, suspension, and brakes were also heavily upgraded in such a way that made it impossible to fall within the rules of the World Challenge Touring Car event. To make it work within the rules of that class, we had to take everything off the car and rebuild to their specifications.”

Htup 1109 02+2006 honda civic si+side view Photo 3/5   |   2006 Honda Civic Si - World Warrior

The K24A2 was removed so that the K20Z3, a motor found originally in the ’06 Si chassis, could be reunited with the FA5 chassis. Auto Electrique Campeau (AEC) from Quebec, Canada, was commissioned to assemble and upgrade the K-series engine for Segs Motorsport. “The boys at AEC did a great job of putting the motor together, and it made some impressive numbers on their dyno. It’s basically just a K20Z3 with stock internals, 60mm throttle body, and tuned on Hondata K-Pro. Along with some other minor details that help to safeguard the engine, the K20Z3 made 224 whp and 161 lb-ft of torque,” Patrick says.

Knowing that the Civic would lack any serious aerodynamic enhancements, Seguin and his team spent much of their time upgrading the suspension in a collaborative effort with Honda Performance Development, Inc. (HPD). HPD, for those who aren’t familiar, is Honda’s North American race division. HPD provided a custom 25.4mm rear sway bar and front/rear bushings made entirely out of Delrin, a high-strength thermoplastic. For stopping power, the only aftermarket big brake upgrades allowed in the World Challenge rulebook are Stoptech four-piston units. If a team chooses to run these, however, they would be required to have an additional 50 pounds added to their base weight. The Civic came from Lombardi Racing with AP Racing brakes, which aren’t allowed, and Seguin didn’t want the added weight that came with the Stoptech upgrade, so he opted instead to run Acura TSX front calipers and DBA 4000-series rotors.

Htup 1109 03+2006 honda civic si+track Photo 4/5   |   2006 Honda Civic Si - World Warrior

The interior hosts a rollcage from Compass360 Racing, a single OMP racing bucket, and Schroth six-point safety harness. An AiM Pista digital dash displays all essential engine information while a Race Keeper data-logging system records all onboard racing with two video cameras. The only element inside the cockpit that would even remotely be considered a “show” piece would be the Mugen steering wheel, mounted to a custom steering column extension.

Htup 1109 04+2006 honda civic si+full view Photo 5/5   |   2006 Honda Civic Si - World Warrior

“Overall, my team and I are very happy with the Civic,” Patrick says. “We will continue to improve as I get more seat time in the car. I’m currently driving it in the World Challenge Touring Car Series, and my best finish this season was third place at St. Petersburg.”

Bolts & Washers

Propulsion
K20Z3
Reinforced front lower engine mount
ARP rod bolts
ARP head studs
Horchels Industries harmonic damper crank pulley
Custom Supertech pistons, balanced and blueprinted rotating assembly by AEC
Hytech baffles
K20A2 oil pump with balancer shafts removed
Tuned with Hondata K-Pro, Sunoco GTX260
Custom PRM Jet Stream intake with velocity stack
Base RSX throttle body with K-Tuned adapter plate, 60mm max
Hondata heat shield intake manifold gasket
Custom Hytech header
Skunk2 Racing exhaust
RDX 410cc injectors
K-Tuned fuel rail
Russell oil cooler system
Mishimoto full radiator
Hydraulic power steering conversion
Red Line Oil 40wt race oil
Optima battery
JDM 5.062:1 final drive
Red Line 75W90-NS gear oil mixed with Heavy Shock Proof
KAAZ 1.5-way limited-slip differential
Hybrid Racing shifter cable and bushings
Custom 14-lb AASCO flywheel
Bully Hybrid Stage 1 clutch kit
Power
224hp and 161 lb-ft
Stance
Moton 2-way shocks with custom top plates
Hypercoil springs from ANZE suspension (700, 800, 850, 900, 950 lb)
Base 4-dr front 24.2mm or Si 2-dr 28mm sway bar, HPD bushings
HPD 25.4mm rear sway bar with custom aluminum holders
HPD front lower control arm Delrin bushings
Custom inner fender brace
ASR front sway bar end links
ASR rear sway bar end links
Custom rear arms and Delrin bushings
Skunk2 rear camber kit
Resistance
Euro Civic SI master cylinder
Acura TSX front calipers
DBA 4000 front brake rotors
Hawk DTC70 front brake pads
Goodridge brake lines
Custom DIY brake duct
Tilton adjustable proportioning valve
ABS delete
Brembo rear brake rotors
Hawk HP+ rear brake pads
Motul RBF660 fluid
Wheels and Tires
245/620-17 Pirelli P-Zero racing slicks
17x8.0 +40 offset Fast Co. FC01 Competition
20mm front wheel spacers
5mm rear wheel spacers
ARP extended studs
Exterior
World Challenge Touring Class rules mandate OE configuration of exterior
Interior
Rollcage courtesy of Ray Lee from C360R
AiM Pista digital dash system
Race Keeper data-logging with two-camera system
Custom fuel cell
2-way fire extinguisher system
Mugen steering wheel and custom steering column extension
OMP seat
Schroth Racing 6-pt safety harness
Schroth Racing driver and passenger window nets
Props
My family for always supporting me; Auto Electrique Campeau, they’ve successfully built and dyno-tuned every engine I’ve raced with and have built every transmission; My team manager Danny Dasilva for allowing me to chase my dream; My three major sponsors: Theberge Homes, capsparts.com and K-Tuned

Owner Specs

Favorite Website
world-challengetv.com
Screen Name Or Nickname
Segs
Building Hondas For How Long
Since 2005 when I purchased my first EK Civic and did a JDM B18B swap
Your Dream Car
’11 Porsche 911 GT3 RS
Build Inspiration
Racing in World Challenge—what I’ve wanted to do since I saw my first WC race on SpeedTV ’06; I chose to race a Honda because I know and trust them
What’s Playing In Your iPod/CD/MP3 Player Right Now
City and Colour
Greatest Movie Of All Time
Gladiator

Connect

Pirelli Tires
www.us.pirelli.com
Segs Motorsport
www.segsmotorsport.com
SCCA Pro Racing World Challenge
www.world-challenge.com
Bully Performance Clutch
www.bullyclutch.com
Hondata
www.hondata.com

Sources

Hondata
Torrance, CA 90503
310-782-8278
http://www.hondata.com
Pirelli
Rome, GA 30161
800-747-3554
http://www.us.pirelli.com
SCCA Pro Racing World Challenge
http://www.world-challenge.com
Bully Performance Clutch
http://www.bullyclutch.com
By Joey Lee
243 Articles

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