Turbo J Pipe on Stock Manifold

[canucksafari]

Hmm, my understanding from naturally aspirated applications: the pulse pressurizing the log manifold when one cylinder is on exhaust stroke 'interferes' with the flow of a subsequently openning exhaust valve. So you lose efficiency and any scavenging effects. Position of the port and firing order affect this diferentially. That is why a equal length headers keeping the flow divided are effective. Though in this case feeding a turbo, the longer header tubes radiate a lot of heat, so there would be a point where losses outweigh gains.

So what do you think is better for a cheap SOB like me matched to the tractor engine TD4.2: J-Pipe, Log turbo manifold or headers? Crusher is right, neither the TD4.2 engine or the Patrol were meant to go like a Skyline.

 

[Dougal]

Log manifold is your best option.

It's not about going like a skyline, there are big gains in drivability between doing it right and not.