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turbo balancing?

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monte_383

New Member
Joined
Aug 28, 2001
Messages
124
Let's say I want to upgrade to a bigger compressor wheel and housing. Do I "absolutely" have to have the center section VSR balanced? What effect does NOT having this done have on turbo life/durability? Working on my daily, can't stand much downtime. Any input will be appreciated. Thanks, Chuck.
 
At 60,000 to 120,000 RPM no matter how small, balancing will make a big difference in relibility. The less vibration the longer it wil last. Hope this helps.
 
Only reason I asked, some people rebuild their own turbos. Do those who build their own send the cartridge out to be balanced, or just mark the wheels before disassembly and match them as close as possible when going back together and call it good. I understand about the high shaft speeds and just the little bit of balance being off could be bad, just curious. -Chuck
 
What I don't get is if each wheel is balanced, why it matters where they are clocked together at. My stock turbo is balanced on both wheels.
 
Originally posted by monte_383
Only reason I asked, some people rebuild their own turbos. Do those who build their own send the cartridge out to be balanced, or just mark the wheels before disassembly and match them as close as possible when going back together and call it good. I understand about the high shaft speeds and just the little bit of balance being off could be bad, just curious. -Chuck

When rebuilding a turbo one needs to mark the compressor orientation and reassemble it the same way. Sending it out to be balanced is an even better option.

Tom
 
Brian Mc - that was exactly my reasoning. If both wheels are balanced, or even just the compressor wheels are neutral balanced to begin with, why would the assembly need to be balanced? Thinking out loud -Chuck
 
I'll be finding out soon enough. I forgot to mark them exactly but got them within 1/4 turn of where they were. Should have it running in 2 weeks or so.
 
Originally posted by Brian Mc
What I don't get is if each wheel is balanced, why it matters where they are clocked together at. My stock turbo is balanced on both wheels.

Maybe the wheels are statically balanced to get it close and then the assembly is dynamically balanced.

Tom
 
when there balanced thats where the little "nut" on the impeller is ground down some right?
 
Originally posted by equalizer442
when there balanced thats where the little "nut" on the impeller is ground down some right?

I think so. Also paint on the blades. gnttype.org has some good info in the rebuilding and/or porting "guide(s)".

Tom
 
Guys, I have a friend that rebuilt his turbo and didn't have it balanced he didn't even mark the wheels before disassembly (car ran 10.39 @ 129). Then I have friends that absolutely will not touch there turbos without having them balanced. good luck either way

BigAl...
 
balancing

If you have a repair center near you that works on diesel trucks ask them where they senf their turbos to be ebuilt.I had a TA 49 rebuilt at a place like this.Very good price and exceptional work.They should just be able to balance it for you.Bruce
 
Usually the shaft/turbine is the only part that if changed a re-balance will be needed as that end has metal ground off it. If it is just the compressor wheel or replacement you can just swap it out in any position because it is already a balanced piece with no grinding to the nut area. I haven't seen one this way but if the compressor nut is ground on then you will need to balance. Clear as mud?
 
You can take a turbine wheel and a compresser wheel from garret they are balanced to their specs which is far from perfect.The nut is uselly not ground but the backs of the wheels if it is bad out of balance they will grind the nut.just my 2 cents
 
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