Turbo noise?

**metstroke06** · #1 (**permalink**) 01-20-2009, 06:20 PM

I noticed something the last week driving.... When I would accelerate a little quicker than normal, then suddenly let off the gas, I notice a sound which I think is coming from my turbo... it sounds like a chug chug chug chug, it lasts about 4 or 5 times (revolutions?) and then goes away. Does anyone know what this is? Also if I take my truck to the dealer and have a turbo problem, would my mods have any effect on my warranty? Thanks!

troid123 · #2 (**permalink**) 01-20-2009, 06:21 PM

commonly refered to as a "turbo fart" perfectly normal.

**metstroke06** · #3 (**permalink**) 01-20-2009, 06:25 PM

Thanks for the quick response. I love forum. I did notice this noise in the past, its just become more common since I got my SCT tuner. I was worried I'd be buying a new turbo. EGT's are normal and everything else is running fine, its good to know this is common. Anyone else experience this?

somebodyelse5 · #4 (**permalink**) 01-20-2009, 06:34 PM

just about everyone lol. dont worry about it your good to go. im not a 6.0 guy, but im pretty sure its disepating the boost. or continuing to suck while the turbine is still spinning. someone will chime in, there are some smart guys on here!

**metstroke06** · #5 (**permalink**) 01-20-2009, 06:45 PM

This is interesting. I have got this noise with a superchips tuner, and SCT on street tune. When I was running xtreme street, i noticed my truck didn't seem to boost as high (although it did have more power) and it didn't make this noise. So this "turbo fart" seems to happen with superchips and SCT on "street" tune, and not on xtreme street. Maybe I'll tune xtreme back in, I was just holding off xtreme till I got studs in my heads.

**PGreenSVT** · #6 (**permalink**) 01-21-2009, 07:17 AM

Turbo fart is actually a reversion due to I high boost condition a a quick let off on the throttle creating a low pressure on the drive side. Not really good for the turbo to abruptly spin it backwards. That's what blowoff valves are for.

Deere Diesel Man · #7 (**permalink**) 01-21-2009, 09:37 AM

Mine does the same thing every now and then. But mine is Howling now instead of whistling

??

FastFocus · #8 (**permalink**) 01-21-2009, 10:12 AM

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