N/A Downpipe Size Question

[btwilson86]

Originally Posted by fullthrottlesrqsupra

one full size all the way back actually ending up a tiny bit smaller at exit

Actually, you want to start out smaller and end up larger. After combustion you want a smaller diameter pipe to maintain the velocity of the hot exhaust gasses. The further the gasses travel, the cooler they get. When the gasses cool down, their velocity decreases causing more restriction in the flow. To avoid this, you increase the pipe size, allowing more gasses to occupy that portion of the pipe.

So, start smaller, end bigger.

Let the arguments begin lol

[supraflymkiii]

^^That was the jist of what I was trying to say.

[907mge]

Here is a pic of it now with the exhasut wrap on it.

[turbonicsperformance]

Originally Posted by btwilson86

Actually, you want to start out smaller and end up larger. After combustion you want a smaller diameter pipe to maintain the velocity of the hot exhaust gasses. The further the gasses travel, the cooler they get. When the gasses cool down, their velocity decreases causing more restriction in the flow. To avoid this, you increase the pipe size, allowing more gasses to occupy that portion of the pipe.

So, start smaller, end bigger.

Let the arguments begin lol

yeah true i was thinking backward (pressure rather than flow) my bad but the sudden increase in size gives you alot of backpressure so try and avoid it either way and the header looks like it will be fine the way it is the wrap is gonna void your warranty and make sure you keep an eye on it for corrosion the wrap is known for causing it

[907mge]

It is a pacesetter there is no real warranty. I had to modifiy it just to get it to fit. I had to remove the non hightemp paint first then paint it with good high temp paint. After that I took and wraped it and sealed it with the hightemp silicone that came with the kit. I'm hope it still doesn't rust.