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Down pipe for a DSM turbo on a civic. External waste gate dump tube held closely to the main pipe. Heat wrapped to keep EGTs consistent.
Here is a long-tube down pipe that I fabricated for a newer civic with a turbonetics kit. It was made to replace the factory catalytic converter without having to have a separate test pipe. The customer hit 12's in the 2007 race season with a four door civic, single cam motor.
Here was my first down pipe I ever made. On my civic, it implemented a divorced tube (waste gate dump tube) that pointed out of the engine bay beneath the oil pan. The tube was fabricated to fit behind the down pipe and in front of the block. It snakes around the lower casting of the block, then shoots backwards. The slash cut was used to improve ground clearance and to promote the acceleration of exhaust gasses out of the engine bay.
Here is a down pipe that was a real challenge. I always require having the vehicle to fabricate parts. This situation was an exception and I had to fabricate this down pipe off of a mock up motor. I didn't have things like the radiator, transmission or other components to help mock this up. The down pipe features a secondary o2 sensor bung (and plug) for a wideband unit to be installed to tune the car. This down pipe has been on the car for well over two seasons and still performs like it should. I fabricated the waste gate dump tube to dump fully behind the oil pan, and the extra length provides more stable boost conditions for rock solid tuning. This car should hit 11s with the single cam motor in the early '08 season with goals of 10s by the end of the season. Good luck Jay!
This down pipe, was quite complicated and took around 8 hours to fabricate. This down pipe went onto an RX7 with big single turbo conversion. It used a V-Band flange off the turbo, and also a V-band re-circulated waste gate. To get everything to bolt up with out any frustration, a lot of time was spent on the research and implementation of the recirculation of the waste gate. While first thoughts and impressions thought that the short route of the waste gate back into the main stream exhaust would create massive boost creep, it in fact, stayed at a solid 9 psi (spring pressure). Once the down pipe was finished (and one long night that was) it bolted up without issues and never was messed with again.
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elcome to the down pipe section.
Down pipes are one of my favorite items to make. Clearances are
very, very tight with down pipes and the detail that goes into them are
extremely important. Things like o2 sensor placement is crucial. The o2
sensor must be within reach of the factory harness, yet have to clear
other things like the oil pan, radiator, cross members or motor mounts. I
just love having a down pipe fit like it was made from the factory. Like a
glove.
