PS13NA – Take a seat

The PS13 chassis is coming along nicely, I still haven’t started work on the actual roll cage side of the chassis but I have made a good start on the floor and firewall sections.


I decided that I wanted to create a little more rearward room in the engine bay, I will have to sort out a way to bring the motor back over the steering rack to make full use of this. The mounts will be the easy bit, the sump clearance wont be, I don’t need an elaborate dry sump setup (although it would be nice) I will just have to re-engineer the sump and pick up for clearance.


The chassis support under the firewall tube creates something to tie the sheetmetal too, not only that it creates a surface to start the transmission tunnel that runs through the car giving the central tunnel area a stack of strength.


Running into the strongest area on an S13, the mid central x beam, this area is thick and sturdy and a great place to finish the tunnel tube. I also wanted to make the seat supports a real part of the chassis design, the chassis rails on an S13 get fairly flimsy around this point and don’t even exist on the LH side, so I will be running a bit of tube through to tie this area off and create a light, strong and safe seating position.


Overall I am pretty happy with how this is coming along, I am now planning the cage design and my emphasis is on keeping it super tight to the pillars and making sure it looks like a production race car.

Remember I am not building this to comply with any race championship, CAMS category or anything like that, I started to do the paperwork that was associated with the series that I wanted to run in but the direction for this car just got skewed and my vision of what I wanted this car to become got lost in rules and regulations, its just a car that I can be proud of and take sprint racing every now and then.

  1. Looks great. Just wondering if you’ve thought of putting a hoop in the passenger side to give yourself more exhaust clearance to the rear of the car, or even looking in to side exit through the sills. Can run it crazy low then.

  2. DRY SUMP!!! if your really going for crazy NA power, then go all the way.

    • How does a dry sump add crazy amounts of extra NA power?

      • Crazy NA power would be extracting every bit of power in naturally aspirated form. Dry sump reduces windage loss be keeping the oil out of the crankcase. It also removes crankcase pressure by pulling a vacuum in the crank case. Vacuum pumps are good for quite a bit of power alone.


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