Why must a turbo have a turbo timer or wait 2 minutes before shutting off and a s/c doesnt. Is there oil in the turbo or something that has to drain out from the oil pump... or to properly cool down the turbo?

 

I believe the oil in the turbo gets MUCH hotter/warmer then in a SC. Letting it idle for a period of time lets it cool down. I very well may be wrong.

 

the basic idea is that the turbo uses oil to keep it cool. the turbo also gets extremely hot. when you turn the car off, especially after hard driving, the oil that gets stuck in the crazy hot turbo will burn. burnt oil = bad. if you're not driving hard it shouldn't be a problem though.

 

now on another note, ive heard about the water cooled turbos. do people who use the timers on those just have them as a novelty item?

 

not sure to be honest. there's people that know alot more about turbos that would be able to answer that better than me.

 

yea, I know the basic of basi information when it comes to turbos. Its just that I figured being water cooled they shouldnt really need a timer, and that the people who had those were using one just to say they had it.

 

well you can touch an S/C as soon as you turn the car off, they remain cool as they ARE the intake, turbo's run off the hot exhaust mani so you can kindof see how they would be different heat wise

 

Deffinatly... not...

the supercharger gets pretty fricken hot.. haha...

 

i know it gets hot, but definately not as hot as a snail, your not going to sizzle skin when you touch our S/C after running around like you would with a T/C

 

lol.. yea dude that turbo ill melt your bones.. haha..

 

well isn't there s/c oil in our eaton's? how is it moved around? and is this oil just for lubrication and not cooling? or both?

if thats the fact it's used for both. would it be smart to let our s/c's idle for half a minute before turning off after using boost for a extended period of time?

 

Its used for both... but not in that sense...

Also the sc wont get as hot, so it wont cook the oil like the turbo will...

no need for turbo timing a s/c..

 

I also heard that another reason to wait is so that any built up pressure/exhaust escapes from the turbo. Makes sense I guess but wouldn't about 5 or 10 seconds at idle to that. 2 minutes is a bit silly unless you've been pushing your car hard in the last few minutes. ?

 

an oil only cooled center section requires time to cool down before shut down after hard driving because once the oil pump stops, so does the circulation of oil through the CHRA thus oil gets left in there to literally bake.

it bakes its self to seal, barrings, ect. that can and often does lead to seal or total CHRA failure.

the water/oil cooled units make this cool down stop unnecessary unless your been absolutely rageing on the turbo for an extended period of time.

the passage of coolant through the center section not only aid's cooling, but the simple fact that coolant becomes vapor when vary hot, then travels through the system to the expansion tank thus allowing more "new" coolant to enter the turbo and repeating that cycle until cool.

 

Yep. Water cooled turbochargers do not need a cool down period.

 

so is the skittle watercooled?

my best friend is under the impression it wasnt cooled at all only by oil. he didnt even know it needed a cool down time before shutting down after hard driving. he actually forgets to do it more than half the time. and he beats the living **** out of the rare ACR SRT-4. it makes me want to steal it from him and garage it. literlly steal it from my best friend lol.

 

Lol.. I hate when people beat on there cars nice cars like they mean nothing..

pisses me off more that they whine when they break.

 

99% of OEM turbo applications are dual cooled for this vary reason.

you can run the car and then just shut it off.

in order to do a successful product validation for production the customer must be able to drive the car how ever they wish and then shut it off and walk away.

with little or no impact on longevity, as that would be a warrenty nightmare.

 

They have to cover their own asses, hard core...

If they treated every customer like they were to do exactly what they were supossed to, and made the car as such.. they would fix 95% of the cars they sell within a month.

 

I believe my 91 mx-6 gt was both water and oil cooled. Either way I purchased a turbo timer. It's just a nice thing to have to help with longevity of the turbo and it's bearings ect.. If driven hard enough turbos can glow red.

 

id love to see that haha..

 

send eric at house of boost an email. ask him about the turbos he has on the G8. i think you'll like them and don't expect to find them anywhere else in the states.

 

ive always thought it was because the turbo's blades are free spinning, and while the car is running there is oil cooling and lubricating. if driven hard and the turbo is spooled, those blades will spin at an astounding rate, and if the engine is turned off and no oil is lubricating the blades then the turbo will seize or cause damage.
the turbo timer allows the turbo to de-spool to an acceptable speed for shut down.


horribly explained im sorry... very tired

 

^^ could be a part of it..

its 98% for letting the oil cool properly

 

You're on the right track. Its allows for the entire turbo to cool with fresh oil instead of cutting the flow and letting it bake to the bearings and/or shaft (which would effect turbine/compressor blade speed)