Quote:
Originally Posted by CorrupTTalon
JFatch1890, ive been good friends with a guy who builds custom turbos for a living for many years. learned many things. and hed tell you to get it balanced.
have you ever balanced? atleast seen someone balance a shaft? have you actually seen a turbine spinning at high RPMS? if you had the slightest clue as to what that turbo is doing then youd treat the internals with care and get the thing balanced. it will save you in the long run.
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If someone builds custom turbos, that probably means they are assembling compressor wheels and turbine shafts that weren't intended to be put together from the factory. This would prompt a balance check.
Anytime I've bought a new TD05H turbine or 16G compressor wheel, it comes balanced when you buy it. I've even asked my turbo parts supplier if balancing a MHI turbo is necessary when you swap a damaged wheel for a new one, and they informed me that because Mitsu turbos are assembled from parts that are component-balanced, they do not require any special type of alignment for reassembly because all of the parts are balanced individually. This means you
do not need to mark the shaft and wheel for turbos that are component-balanced.
It's interesting to me that a shop like G-Pop will openly tell you that your turbo doesn't need rebalanced. I honestly feel these shops are such balance whores because they need to pay for that fancy $20,000 balancing machine.
Now I'm not saying to never balance a single turbo or individual part....I've already bought Garrett wheels that didn't come with a single balance grind and absolutely needed to be balanced before assembly. You just have to know a situation that would prompt a rebalance:
- If you're rebuilding your turbo and you notice that excessive in/out shaft play has caused the wheels to kiss the housings, but neither wheel has sustained major damage that would prompt replacement, the turbo should be rebalanced.
- If your compressor wheel has a couple nicks and chips on the leading edge of the fins at the time of a rebuild, you should have the wheel rebalanced.
- If you're doing a routine rebuild and you're not replacing any of the wheels, you do
not need to have the parts rebalanced.
- If you're replacing one of the wheels on a component-balanced turbo, you do
not need to have the turbo rebalanced.
If the turbo is component-balanced, the compressor nut will not have balance grinds. Anytime the rotating assembly is balanced, the turbine shaft, compressor wheel, compressor nut, compressor seal collar, and thrust bearing collar are all spun.
CorrupTTalon, I didn't mean to insult your intelligence....I just feel there's a big difference in the advice given by someone who happens to be friends with a guy who builds custom turbos (yourself), or someone who has rebuilt over 200 turbos out of his garage in the past 5 years without a single labor-related failure (me). I hope you understand.
. If its bad weather be careful. Im hoping to get out of school tomorrow. If theres snow. I hope I have time to practice some drifting in the parking lot. 
