Re: t3/t4 bigger exhaust? (StevenH)
It's true that if you go too big you loose power, especially in the lower rpm's. With respect to making horse power, the exhausts job is to produce the minimum back pressure. if you go too big, the exaust gas expands too much and as a result, cools off too much therefore increasing resistance to flow and also back pressure which robs power. The extra surface area of an over sized pipe also contributes to the problem of cooling the egt.
That being said I think a 3inch is about perfect for the t3/t4 making around 300hp or a bit more. The idea of making the exhaust shorter via a side exit is a good plan for power if it doesn't get crushed.
Cheers
Sam
It's true that if you go too big you loose power, especially in the lower rpm's. With respect to making horse power, the exhausts job is to produce the minimum back pressure. if you go too big, the exaust gas expands too much and as a result, cools off too much therefore increasing resistance to flow and also back pressure which robs power. The extra surface area of an over sized pipe also contributes to the problem of cooling the egt.
That being said I think a 3inch is about perfect for the t3/t4 making around 300hp or a bit more. The idea of making the exhaust shorter via a side exit is a good plan for power if it doesn't get crushed.
Cheers
Sam
