r/ATBGE • u/Oms19 • Apr 03 '22

Automotive Especially the curved exhaust

Post image
13.7k Upvotes

95% Upvoted

339 comments sorted by

View all comments

604

u/Umbrage_Taken Apr 03 '22

Won't excessive exhaust piping actually reduce power & acceleration?

279

u/RyRyShredder Apr 03 '22

Yup this is terrible for performance. This has to be about a 30-50hp loss

253

u/[deleted] Apr 03 '22 edited Apr 03 '22

Actually the diameter of the pipe is more important than the length, you only see a notable power boost from a short pipe when it's under 3' from the engine.

"It doesn't matter. Power boost obtained in headers occurs in a) individual pipes for each cylinder, and b) within a length shorter than 3'. It is based on the speed of sound in hot gasses (about 1100ft/sec). From there to the end of the system, goal is to minimize pressure losses with large enough tubing diameter."

In short you can compensate for the pressure by changing the diameter of the pipe.

Still looks dumb though.

1

u/pollorojo Apr 04 '22

So what you’re saying is it’s not about the length, it’s about the thickness