ball bearing turbo spooldown??

[GSXerr]

my friend and i installed a ballbearing pte 50 trim into his eclipse, and now whenever we turn the engine off it sounds like we can hear the turbo 'spooling down'. is this normal? i figured since they probably spin for a long time after shutdown that this is the sound we are hearing. thanks!

 

[MyBeatGSX]

Yes its normal. BB turbos will even spin for a long time if you spin it by hand. So yes, they go for quite awhile after going at full speed.

 

[Staytuned]

Yes this is very normal. My turbo will spin for 10 secs or more after shut down .....even at idle rpms.

 

[jepherz]

That's sweet, you know it's building the most boost it can. Not many cars can have positive pressure while turned off

 

[GSXerr]

ok thats good news! had me worried a little, because its pretty loud. i thought something was wrong! i guess the metal intake pipe i put on with it amplifies the sound too!

 

[a_scobel]

Mine does the same thing. Fooled my friend into thinking something was wrong too..'uhhh that doesn't sound normal' was his reaction.

 

[blackGSX2g]

Yep, same thing here. Just be worried if you shut off the car and it DOESN'T make that sound.