Project EF Civic Racecar: Redheaded Stepchild

Around a decade ago, Clint Boisdeau bought a 1990 Honda Civic to use in the former MotoIQ Pacific Touring Car Championship.  That car had a wonderful, revvy B18C engine, a factory Type-R 5-speed transmission, Integra brakes, and a well developed suspension.  That car mixed all of Honda’s best parts and put them into a handsome, quick package.

Not Clint's Civic
This is not that car. But I’m stealing the project page anyway.

During the driver’s meeting at a South Jersey Region autocross, one of the regional officers announced that he was selling his old Civic racecar.  We had a chat and a day later I went to see the car.  I made a snap decision to buy it and bring it home.  See, as much as I love my Suzuki Cappuccino, it no longer fulfills my performance goals.  Having never been sold in the US, the Cappuccino is not eligible for National SCCA events in any Street class.  The cramped compartment means installing an SCCA or NASA legal rollbar is not possible and installing a full cage would take away from its primary purpose as a fun street car, so track days are out.  In order to do track days and National events I would either have to turn the Cappuccino into a dedicated track car or replace it.  I had been searching for 6 months to find a new weekend warrior.  I started looking at Mitsubishi EVO VIIIs and IXs (too expensive), Nissan 350Zs (mostly trashed so the good ones are expensive), and I had my heart set on a Toyota MR-2 Spyder (lightweight, perfect balance, and fits my trend of grabbing classic JDM cars before they become popular).  But then the Civic came along at a price that was too good to pass up.  Now I could retire the Cappuccino to full street car life and have a dedicated racecar for track fun.  The plan is to make this Civic a strong autocross/track day car.  I’d love to do some road racing too but we’ll have to see where my budget can stretch. 

Towing the Civic home
We picked this car up in New Jersey. I don’t yet own a trailer, so I rented a U-Haul tow dolly to get the car home.
U-Haul dolly's tire has a broken belt and a dangerous tread bubble
This almost ended in disaster as the dolly had a bad tire that began to bubble. Fortunately another motorist flagged us down before we got on I-295. U-Haul’s roadside assistance was able to send out a truck to replace the dead tire on the side of the road. Promising start to our life together.

This particular Civic has been a racecar for a long time.  It was built for SCCA Improved Touring racing.  IT is a mild modification class a step above Showroom Stock.  Modifications allow removal of the interior, some cylinder head work, engine blueprinting, and some mild suspension work.  The class is broken down by engine size and weight.  The EF Civic ends up in Group C, hence the ITC lettering.  Due to the rules, the stock engine and transmission must remain in place. 

Civic EF engine bay with D15B2 engine, ram air intake, and DC Sports header
The history of this car is a bit murky and from what I can gather it is a 1991 Civic CX (aka the STD), which means it is a Canadian market car and it should have a D15B1 in it. The engine under the hood is the slightly more powerful American spec D15B2, hooked up to an A100 4-speed manual transmission. A D15B2 works in IT as the bottom end is the same as the original B1. The changes to the head are allowed by the rules. Being a D15 there is no VTEC and the fuel injection is inferior throttle body injection (optimistically called “Dual Point Fuel Injection”). Unfortunately, the log book for this car went missing so we don’t have exact specs on the engine. We know that it has a basic intake and a rather rusty DC Sports 4-1 header. The exhaust is straight piped with no catalytic converter or muffler and it is incredibly loud. We plan to put the car on the dyno soon so we can determine if any headwork has been done. The ECU is the stock PM5 unit.  We took a short test drive of the car around the seller’s rural New Jersey neighborhood and found the engine was nice and strong and the transmission slotted into all four gears nicely.

3 comments

  1. A “Petty bar” is one that goes from a point high on the main hoop to a point in the passenger footwell. The internet generally agrees with this, though I saw one post that described it as reversing what must have been common practice at some point in NASCAR where the diagonal in the main hoop was low on the drivers side and high on the passenger side, leaving the section over the driver unbraced.

  2. Following closely!
    My friend and I have a similar EF 2dr, with a D15b high comp vtec fuel injection engine
    We got to throw the original dual carb out as the class restrictions were CC only 🙂

    Any FB / IG page that I could follow?

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