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Old 09/30/2009, 03:11 AM   #1
turborex
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Default differences on turbos

can anyone tell me the difference between journal bearing, wet float bearing, and ball bearing.
i know ball bearing is less lag time even at high a/r and faster spooling i think, any help is appreciated thanks

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Old 09/30/2009, 09:44 AM   #2
jordan_xX
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Default Re: differences on turbos

I may be wrong but, I think a jounal bearing turbo is oil cooled only while ball bearing turbos are oil and water cooled.

Last edited by jordan_xX; 10/13/2009 at 01:42 PM.

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Old 09/30/2009, 11:21 PM   #3
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Default Re: differences on turbos

Quote:
Originally Posted by jordan_xX View Post
I may be wrong but, I think a jounal bearing turbo is oil cooled only while ball bearing turbos are oil and water cooled. The water makes the turbo spool faster while keeping it cooler.
thanks for your input, ill keep that in mind.

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Old 10/01/2009, 02:23 AM   #4
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Default Re: differences on turbos

Journal bearing can be oil cooled and water/oil cooled,many Mitsubishi turbos are like this.I dont know a lot about the bearings as I am just learning,but I was told that ball bearings cannot be rebuilt,when that $1400 Garrett GT4088R takes a shit,you throw it away.Id rather have a standard jorunal bearing just because it can be rebuilt.


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Old 10/01/2009, 06:36 AM   #5
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Default Re: differences on turbos

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Originally Posted by Sleeper91TSI View Post
Journal bearing can be oil cooled and water/oil cooled,many Mitsubishi turbos are like this.I dont know a lot about the bearings as I am just learning,but I was told that ball bearings cannot be rebuilt,when that $1400 Garrett GT4088R takes a shit,you throw it away.Id rather have a standard jorunal bearing just because it can be rebuilt.
You can rebuild a ball bearing turbo, it is just very expensive.


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Old 11/06/2009, 09:40 PM   #6
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Default Re: differences on turbos

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Originally Posted by dsmer06 View Post
You can rebuild a ball bearing turbo, it is just very expensive.
just as expensive than buying a new one ??? lol


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Old 11/15/2009, 11:58 AM   #7
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Default Re: differences on turbos

Guess I don't know about a 'wet float' but thrust bearing is going to be similar to the bearings you use for a crankshaft or rods where they're smooth all the way around and the shaft itself floats on a very thin layer of oil to minimze wear. A ball bearing is exactly what it sounds like, it's a bearing with little balls that line all around it.

The ball bearing turbos are known for taking harsher conditions, they require less oil to properly work, and they can improve boost threshold (the amount of time it takes the turbo to spool from lower RPM) and turbo lag (the amount of time it takes the turbo to fully spool after shifts). As far as how reliable they are, I've had thrust bearing turbos that last over 100k miles (stock mitsubishi) and some that have only last less than 5k miles due to improper treatment or even contamination in the oil. Ball bearings are the same way, they will last forever and a day as long as you treat them right.

As far as what you should get, it really depends on the application, sometimes you really don't need a ball bearing turbo. Example of that being you've got a properly sized exhaust A/R, everything is setup properly, the turbo isn't overly large and you're moving a good amount of exhaust, you wont really notice much of a difference between the ball bearing and the thrust bearing. However if you're spinning it pretty quickly or you want as much out of the turbo as possible then ball bearing might be worth the extra cash, or dual ball bearing if you have the option/money; that or if you know you're going a little too large or have specifications a little outside the norm, ball bearing could really help to improve a poor threshold or lag (maybe 400-500rpm threshold difference).

If you're serious about doing this, I've always found the best thing to do is to call up the turbo manufacturer as they understand their flow rates better than what I ever could and they will make a good recommendation based on your power goals and where you want your power range to be. The last thing you want is a turbo that's too large or small and all your power to come on as your shifting or straight off idle.

Last edited by ej8mando; 11/15/2009 at 12:29 PM.

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Old 11/15/2009, 07:55 PM   #8
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Default Re: differences on turbos

^^ good info

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Old 11/17/2009, 02:32 AM   #9
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Default Re: differences on turbos

he went with ball bearing!!!

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