I am considering different options here about how to properly cool down a journal bearing turbo (ie. non water cooled - only oil cooled) :

1. Stay out of boost for about 5 - 10 mins before reaching destination and shut off car immediately.

2. Use a turbo timer (I actually have an alarm with a buit in turbo timer sitting around)

3. BOTH of the above lol.

What do you guys think?

 

Well....take in to account how many factory automobiles/semi/tractors/equipment use oil cooled only turbos and DON'T use turbo timers and get thousands of hours and miles.


Now make your own decision.

 

LOL ^ You must drive a Buick Can someone who uses or has experience with high hp journal bearing turbo setups post some info RELATED to my original question. Thank You!

 

Found my answer in the thread below, so anyone searching for the same and this post comes up, here ya go

https://honda-tech.com/forums/showth...5#post45443075

 

Either or works, and on a few factory turbo vehicles it even says to allow the car to come to full operating temps before boosting and always allow for cool down before shutting the car off. My friends 91 eagle talon says it right on the driver side visor and in my owners manual for my evolution.

 

From volvos, saabs, buicks and others, the majority are both oil and water cooled journal bearing turbochargers. A timer doesn't hurt, so you can get your keys, belongings and even lock things up. By the time 30 seconds is over, the turbo has cooled properly. There's really no issue to dispute. Use one, or don't. It's a matter of personal perference, really.

 

good points. I used a t25 based turbo with water cooling for the sole purpose of never turbo timing anything ever.

 

All performance turbochargers are water cooled! just somthing to bear in mind since alot of kit turbos are not water cooled.

Best thing to do in my experience is to watch the EGT temps and when its back down to a reasonable temperature after cruising light throttle for a while then its safe to turn it off. The main issue is that if the turbo is still very hot and you shut it down hot, it boils the still oil in the charger and forms a film all over in the oil ways. over time and repeated hot shutdowns this can reduce oilflow drastically which can lead to turbocharger failure. This is why it also pays to run high quality/high boilingpoint/shear point oils.

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Will@RDT

 

...remember theres no set time it needs to cool down, everythings measurable.

i.e. EGT might be cool enough to shut the engine straight off no problem, but if your at 1000*F for instance, then your going to have to let it cool down for longer than as if it was at 500*F

 

which typically is directly associated with oil temperature and use, not EGT. For example, where oil may reach over 120*c after a session on a road course, needs more time to cool down than say a quick run on a city street where its only 90*C. Greddy timers actually can calculate (more like guesstimate) the amount of time it will cool the turbocharger by way of a timer on the face of the unit. It isn't perfect, but handy.

 

So what you like kid....bash away, but all of my toy Honda's and Buick's always just get shut off...my 67 on my GN has got 90000 miles on it of hard beating and still no problems. My little B series with 60-1 has 27000 miles of really really hard living...no problems either. My Cat C15 twin turbo has 600000 miles on stock twins with no water or timer....

just saying.

 

Awww don't get all soft on me man

= I was just kiddin with you lol - no bashing Now as to your statement above of just shutting em off after a good hard beating...hmmmm I wonder who else agrees with that? This is interesting...

 

I certainly agree with the oil being directly associated with the temperatures. But in my experience with clients racing who have adequate oil cooling systems the oil will not get to excessive temperatures (for xyz brand of quality oil) and the exhaust gas is essentially the heater of the oil.

 

Most of yours and my clients yes... but this is H-T. Home of the CHEAP... They won't have those oil cooling systems.

 

haha very good point.

 

Hey I do have an alarm system laying around that has a turbo timer built in and it goes up to 2 mins time I think. That should be enough time and a good set up don't you think? The remote even has a dedicated button for the turbo timer and I really like that I can just press the button and turn the alarm on normally thereafter

 

i have an oil cooler, does that mean i dont need turbo timer?

 

No. I still recommend one. It simply means that the cool down time can be lowered significantly because of the fact that on average, your oil temps are going to be lower than those without onee. A cool down period (no more than about 30 seconds in 90% of the situations) is still recommended.

 

Shodan, this alarm that I speak of and just discovered that has a built in turbo timer is fixed at 2 mins, should it be ok to run it like that? I like that I just turn the timer on from the dedicated button on the remote. I was thinking 2 mins is ample even for some hard driving on the street (my car is not a track car btw).

 

Ah yes, the Vipers do that.. that's fine. Rock on.