turbo and boost question

[Anonymous-0]

Here's the question at hand. Say your turbo has a 2" dia air outlet for the pressurized air and you run the pressurized air through a 2" inside dia. pipe to the intake manifold. Lets say the opening in the manifold is also 2". Now if I was to go from the turbo into a 4" inside dia pipe to the 2" manifold would that make any difference in my boost pressure? If I went to to 4" pipe would I have to make the manifold inlet that big as well to make a difference in anything? Would that bigger volume pipe change boost pressure or would it even matter since its boost and not air going in at atmospheric pressure? Thanks

 

[jdiesel]

it shouldnt matter much, some guys will say the greater volume "waiting" for the intake will make a differance, but i have never seen dyno readings to verify. what will help you alot is an intercooler, cooler air = a more dence air charge. i have an intercooler with 1 3/4 in and out, out of some small car, it will fit under a hood preatty neatly, all you need is an electric fan or ice tub. 740-569-7351, jake.

 

[Doug Oliver]

If you can have your pipe matched in diameter on both ends that would be ideal. When you make transitions from different diameters it makes un wanted turbulence in your intake. Also remember that boost is a measuremnet of resistance to flow. The higher the number the more resistance. It is better to have 1000cfm at 40 psi than 1000 cfm at 80 psi. The higher the boost ,the hotter the intake air charge will be. Hope this helps. Doug

 

[Anonymous-0]

we had somr major head work done on our tractor and the shop sent a bigger inlet pipe when done. they said it would act as a tank for when rpms started to drop its hard to tell but i dont think it made mutch difference

 

[Cody Adgent]

Your "boost" pressure will be dictated by the restriction in your head. For instance, A tractor with a ported head with bigger valves will have less boost pressure than a tractor with a stock head. Alot of pullers think more boost is better, but that isn't alway true. More volume is better. Another thing that turbo pullers are starting to look at is air/fuel ratio. Some are finding if they back the boost back and put the air/fuel ratio closer to the optimal range, they are picking up horsepower.....

 

[JDGnut]

Cody.. are they picking up HP because of the drive pressures are so high.. or air/fuel ratio is so high..

 

[Cody Adgent]

They are picking up HP by lowering the boost pressure on a high flow heat. this reduces heat and helps put the air/fuel ratio back in check.