3 Inch Exhaust Prado TD

Thanks for the tip, I'll give Denco a call.

Hi Chris

Glad to see your back and online. Now, everyone talks about the loss of backpressure in a bigger exhaust and its effect on bottom end, but to my way of thinking, the way a turbo operates is the bigger the difference in pressure between the inlet and outlet of the turbo, the greater the performance of the turbo. While I agree there is probably virtually no pratical gain between a 2-1/2" and a 3", I cannot see it being worse. You know from your experience that replacing the dump pipe gave arguably the biggest gain as it was the biggest restriction.

It reminds me of when I got extractors and 2-1/2" for my 80 diesel. Everyone reckoned while I would gain top end performance, I would lose bottom end. Well, by the seat of the pants that was true, but I had it dynoed before and after and what really happend was the top end gain was much better than the bottom end gain, so it "seemed" like bottom was worse but fact was bottom end improved marginally while top end gained around 15%.

Anyway, i don't know the answer for sure for turbos, but I don't think the myth of needing back pressure is true for turbo diesels. Especially in light of my 80's extrctors experience.

Cheers

Captain

Phil,
already have the Dtronic, but they don't get rid of all the turbo lag on take off. Contacted a Brisbane Turbo and they agree that 3 inch is too big and that there is no gain but a loss at the bottom end.

Thye have suggested a 2.5 mandrel exhaust (standard waste gate) with a boost control valve. Seems the onwer did his and it worked a treat. Aparently the Dtronic is also part of their upgrade pack, so I'm part the way there.

Wizard