Project S2000: Part 32 – Fitting and Installing Turbo System Parts

Here is the stock AP2 cat with the heat shield removed. Honda used narrow angle diffuser and nozzle to minimize pressure drop going into the cores. Yup, Honda squeezed out performance everywhere.

It’s a bit tough to see as it’s out of focus, the front brick came loose and smashed the rear O2 sensor leaving a dent in the core. The car had developed a rattle and that rattle was the core shaking around.

Hey, it’s tight in there but it all fits! In case you were wondering, that rubber tube should be the condensate drain tube from the evaporator of the air conditioner.

The team at Eimer Engineering welded a brace between the wastegate recirculation tube and the main 3” exhaust to prevent the wastegate tube from cracking where it merges into the main pipe. The merge is a nice narrow-angle merge for low back pressure on the turbine.

Eimer Engineering decided to clock the turbo a bit to create some more space for routing the compressor discharge pipe and also to create more clearance to the Improved Racing remote oil filter adapter and oil cooler coolant line coming out of the block. The coolant hoses are looped to bypass the stock oil cooler which was removed while I was trying out the whole oil filter mount/cooler/sandwich stack.

The braided stainless-steel line you see is the coolant feed to the turbo. It will be on the engine block side and going into a bottom port on the center housing of the turbo. The coolant outlet is on the frame rail side and going upwards. This orientation of cool coolant feed going in the bottom and hot coolant going out the top is to promote syphoning when the engine is not running. I got these lines pre-fabbed from ATP Turbo.


  1. Do you still have that alternate vented hood? Seems like it would come in handy to dissipate the heat from the turbo considering how high that air intake is in the engine bay.

    Glad to finally see another post on this car. Always loved the chassis, it just needs some power to make it golden.

    1. I gave that hood to the owner of Project AP1 S2000. I’m staying completely stock hood sticking to the sleeper stealth theme. A NACA duct right in the middle of the hood where the intake is would be optimal, but that would attract unwanted attention. While sitting stationary, the intake will suck up some of the warm air coming off the manifold/turbo. But I figure in first gear, the car will be traction limited anyway. Once the car is moving, I’m plumbing cool air towards the intake, so it should be sucking in near ambient temp air. We could possibly fab up an airbox to completely isolate the intake from radiator air, but I don’t think it’d be worth the effort.

      1. That engine bay is looking mighty crowded, I don’t know if you could get some kind of snorkel to vent into the air filter like this:

        Yeah, I understand wanting a sleeper. I had my first car stolen within six months because I put some chromed aluminum 17” wheels on it. When I got it back (with some crap steel wheels) I used the insurance money to search for the lightest, yet stock looking aluminum wheels I could find. I eventually turned it into an auto-X car, but I was always mindful to remove the race wheels and slicks immediately before going home.

        Because of that initial experience, I have always tried to make my street cars look understated. I absolutely subscribe to the ‘sleeper ethos’….because, as you say ‘life.’

        1. I have to admit… I was eyeballing a Dodge Viper hood NACA duct… I talked myself out of it to stay under the radar. Some of the air from the driver side bumper duct will work its way into the engine bay. The passenger side bumper duct will be the primary way to plumb ambient air to the intake. When the front bumper is fully mounted, there may be a gap between the top of the heat exchanger and the top of the bumper opening. If so, we can make another air diverter plate to force air to go over the top of the radiator like the snorkels.

    1. I’m waiting to get my car tuned to determine the wastegate performance before I sell the one spare manifold. I’ve been driving it around, making sure all the small things are in proper working order before going in for a tune. I’m hoping to have it all ready by the end of September.

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