Hi, Guest
09-05-2005, 12:12 PM
sorry, upgrading to a bigger exhaust is not needed HOWEVER a larger exhaust from the turbo back will make a fairly dramatic difference in how fast your turbo spools up.
this is a very rough estimate but with a 2.25" turbo back exhaust as the base you can see anywhere from 300-800rpm faster spool time from a 2.5" exhaust depending on the turbo and anywhere from 600-1500rpm faster with a 3" exhaust.
there are a lot of factors that effect the spool time like displacement, flow into the engine, amount of boost, restriction of the exhaust, the turbo being used is usually the biggest factor when upgrading the size of your exhaust.
on a street setup pushing under 200-250fwhp a 2.5" turbo back exhaust is perfect.
basic rule of thumb....
anything under 175fwhp, 2.25"
175-250, 2.5"
250+, 3"
like i said, you can use a 2.25" exhaust but it wont work as well as something a bit bigger.
this is a very rough estimate but with a 2.25" turbo back exhaust as the base you can see anywhere from 300-800rpm faster spool time from a 2.5" exhaust depending on the turbo and anywhere from 600-1500rpm faster with a 3" exhaust.
there are a lot of factors that effect the spool time like displacement, flow into the engine, amount of boost, restriction of the exhaust, the turbo being used is usually the biggest factor when upgrading the size of your exhaust.
on a street setup pushing under 200-250fwhp a 2.5" turbo back exhaust is perfect.
basic rule of thumb....
anything under 175fwhp, 2.25"
175-250, 2.5"
250+, 3"
like i said, you can use a 2.25" exhaust but it wont work as well as something a bit bigger.