Compression Ignition Addict
Join Date: Nov 2008
Location: Houston, TX
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i think its funny how people call this noise a "turbo fart". in the turbo gasser world its referred to as compressor surge. as stated above blow off valves are typically a cure for this. the boost pressure has to have somewhere to go when you let off the pedal quickly and close the throttle plate, when cars/trucks have blow off valves it escapes through them.
however the 6.0's do not have a throttle plate nore do they have a bov. Most of the time that excess boost just goes into the engine and we think nothing of it, however when you increase the boost with the SCT and abruptly let off the throttle all that boost still has no room to go into the motor and causes compressor surge. basically the air goes in reverse and gets shoved out of the turbo the same way its sucked in, causing the turbine to spin the opposite way against the new air being pulled in. this is NOT good for the turbo, however it doesn't happen enough for it to cause any damage to the turbos and or motors on the 6.0l
'07 F-250 PowerStroke - 5" MBRP Straight Pipe, Edge Insight, Eric Tuned SCT, HID's, 2.5" Newton Lift w/ 4" rear block and Icon Caster Sleeves, Bilstein 5100's, 18" XD Monster's w/35" Toyo M/T.
'01 BMW ///M3 - Weekend Toy
'17 Chevy Malibu - DD and Company Vehicle
Last edited by FastFocus; 01-21-2009 at 11:24 AM.