Rebuilding Turbo
- Thread starter Audio Man
- Start date
Flyin Ryan
hated cuz he drives fords
Re: Rebuilding Turbo
Gonna have to be balanced though
Gonna have to be balanced though
sytyguy
Moderated User
Re: Rebuilding Turbo
20G is a superback comp wheel, 17C is flat back. 20G uses a larger machined comp housing than the 17C. And if you want to use the larger A/R exhaust housings (a true 20G), then you'll need to upgrade to an "H" wheel. Buying each component to build a 20G works out more expensive than sourcing one used and rebuilding it. And if you do rebuild a 20G, measure your radial bearings before ordering a rebuild kit. A lot of TD05 20G kits are sold as TD06H kits, and they have the wrong radial bearings (ironically, the TD06H uses a .354" bearing to the TD05's .393" bearing......and even that isn't always the case).Audio Man said:
Speaking from experience? I've rebuilt three stock turbos and two 20Gs, and every single one I've rebuilt is component balanced.Flyin Ryan said:
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Re: Rebuilding Turbo
Correct all the way ......but they do make replacement center cases
for a drop in just order the right one .
Correct all the way ......but they do make replacement center cases
for a drop in just order the right one .
sytyguy
Moderated User
Re: Rebuilding Turbo
True, but a 49179-08940 CHRA goes for just over $400 and a 49179-04100 CHRA goes for almost $450. That's more than what you could pay to have one rebuilt professionally, even with a compressor wheel replacement. Do it yourself, and you're looking at 1/4 the cost of a new CHRA.
jaystcb
Sy 0902, 92Ty 0909
Re: Rebuilding Turbo
NO, It is not that simple.
Pull apart your turbo. Check your shaft for play and any damage like wear spots and make sure it is not bent. Also check the housing for bearing wear. If all looks good you can measure your bearings and order a kit. If I remember correctly the kit is around $100- $150
Then measure the shaft. You can order a 20G wheel to fit the shaft. The wheel should be around $200.
You will have to machine the back side of the wheel for bearing clearance then you will have to machine the intake housing to fit the wheel. I recommend taking it to a machine shop with a lot of turbo experience.
Once everything fits correctly you will have to get it balanced.
Total cost to have this done by a shop is a around $700. That is NOT including removing the turbo from your SyTy.
It is cheaper to just core exchange your turbo for a new one. That is unless you are one skilled machinist.
NO, It is not that simple.
Pull apart your turbo. Check your shaft for play and any damage like wear spots and make sure it is not bent. Also check the housing for bearing wear. If all looks good you can measure your bearings and order a kit. If I remember correctly the kit is around $100- $150
Then measure the shaft. You can order a 20G wheel to fit the shaft. The wheel should be around $200.
You will have to machine the back side of the wheel for bearing clearance then you will have to machine the intake housing to fit the wheel. I recommend taking it to a machine shop with a lot of turbo experience.
Once everything fits correctly you will have to get it balanced.
Total cost to have this done by a shop is a around $700. That is NOT including removing the turbo from your SyTy.
It is cheaper to just core exchange your turbo for a new one. That is unless you are one skilled machinist.
berzerker
wookie
Re: Rebuilding Turbo
Mike ... please enlighten us on how this could be done . i have a 20g that seized due to poor business practices . would like to rebuild the unit lowest cost possible . thanks .
Mike ... please enlighten us on how this could be done . i have a 20g that seized due to poor business practices . would like to rebuild the unit lowest cost possible . thanks .
It's just a six
Super Member
Re: Rebuilding Turbo
Just mark the shaft & the compressor wheel so they go back together thae same way it came apart if you are rebuilding it stock.
If you purchase one of these: http://www.ebay.com/itm/Turbo-Cartr...Parts_Accessories&hash=item5896454b39&vxp=mtr you still would need to have the compressor housing machined to fit the 20G compressor wheel & you would have to machine the turbine housing machined to fit the larger "H" wheel.
Rebuild kits http://www.ebay.com/itm/DSM-16G-18G...Parts_Accessories&hash=item48494bd563&vxp=mtr
http://www.ebay.com/itm/Turbo-Repai...Parts_Accessories&hash=item416ae613c7&vxp=mtr
I believe there are 2 style rebuild kits for either a compressor wheel that is flat on the back side or one that is convex. You would need to know if your compressor wheel is flat or convex before ordering. I am not absolutely positive about this, just going from memory that I had to deal w/a few years ago.
Just mark the shaft & the compressor wheel so they go back together thae same way it came apart if you are rebuilding it stock.
If you purchase one of these: http://www.ebay.com/itm/Turbo-Cartr...Parts_Accessories&hash=item5896454b39&vxp=mtr you still would need to have the compressor housing machined to fit the 20G compressor wheel & you would have to machine the turbine housing machined to fit the larger "H" wheel.
Rebuild kits http://www.ebay.com/itm/DSM-16G-18G...Parts_Accessories&hash=item48494bd563&vxp=mtr
http://www.ebay.com/itm/Turbo-Repai...Parts_Accessories&hash=item416ae613c7&vxp=mtr
I believe there are 2 style rebuild kits for either a compressor wheel that is flat on the back side or one that is convex. You would need to know if your compressor wheel is flat or convex before ordering. I am not absolutely positive about this, just going from memory that I had to deal w/a few years ago.
sytyguy
Moderated User
Re: Rebuilding Turbo
Your prices are askew. Kits are around $60 and wheels are around $50. If the unit is component balanced, then there is no need to balance it. We aren't talking Turbonetics custom turbos that you saw a YouTube video where they are assembly balanced. We're talking MHI production units where they are component balanced. Big difference.
Find the nature of the failure. Did the unit seize from a bad bearing? If so, did it damage the bore? Too much damage creates a core.
Did you read my earlier post? Our 17Cs are flat back, our 20G are superbacks. And the kits you listed are big shaft kits with .393" radial bearings.....not the smaller .354" that is needed. All 20Gs are not the same....kinda like saying LS-engine. Lots of Classes inside that Phylum.
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jaystcb
Sy 0902, 92Ty 0909
Re: Rebuilding Turbo
The next time that I need a turbo or one rebuilt. I'm going to go to you. Your prices are almost cheaper than filling the my tank with gas. California Gas prices suck ($4.87 was the highest I've seen today)
The last turbo that I had rebuilt with NO MACHINE WORK was $550. W/ new shaft, KIT, 20G wheel and balance.
Like I said I like your prices better.
The next time that I need a turbo or one rebuilt. I'm going to go to you. Your prices are almost cheaper than filling the my tank with gas. California Gas prices suck ($4.87 was the highest I've seen today)
The last turbo that I had rebuilt with NO MACHINE WORK was $550. W/ new shaft, KIT, 20G wheel and balance.
Like I said I like your prices better.
berzerker
wookie
Re: Rebuilding Turbo
The failure was due to poor practices made by a now out of business outfit named TEC turbos out of Golden ,CO . Moved and now ran by the former owners brother in California . they sold me their bad dog 20g . worked great for about thousand miles. then seized up on me. took it apart to inspect for cause of failure . found the thrust washer had the oiling orifices closed off with welding wire . Assholes !!!!!!!! $ 780.00 down the drain . now i have a cool paper weight . looking to put it back together need to know the cheapest route. thanks .
The failure was due to poor practices made by a now out of business outfit named TEC turbos out of Golden ,CO . Moved and now ran by the former owners brother in California . they sold me their bad dog 20g . worked great for about thousand miles. then seized up on me. took it apart to inspect for cause of failure . found the thrust washer had the oiling orifices closed off with welding wire . Assholes !!!!!!!! $ 780.00 down the drain . now i have a cool paper weight . looking to put it back together need to know the cheapest route. thanks .
sytyguy
Moderated User
Re: Rebuilding Turbo
Need to measure everything and look for housing wear. If the lack of oiling caused galling to the inside of the housing bore, then you'll either need to replace the housing or machine the bore for an oversized radial bearing or sleeve. Same thing applies to the face of the housing where the washer rides. To much wear there and you'll be swapping housings or machining it down and running a matched shim. Things can appear tight and unworn to the eye, but be out of tolerance and fail shortly after rebuild. An ounce of prevention now will reap thousands of miles of additional use later.
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BMFB
Not to scale
Re: Rebuilding Turbo
This man speaks the truth. I've rebuilt mine out of garbage from craigslist and a rebuild kit...unbalanced...4k miles on it so far. I think total cost is 200 dollars. Although I am thinking about getting a bigger turbo...
As far as rebuilding them though, they are pretty breezy
This man speaks the truth. I've rebuilt mine out of garbage from craigslist and a rebuild kit...unbalanced...4k miles on it so far. I think total cost is 200 dollars. Although I am thinking about getting a bigger turbo...
As far as rebuilding them though, they are pretty breezy
Flyin Ryan
hated cuz he drives fords
Re: Rebuilding Turbo
Never did stock just a turbonetics hybrid which wasn't component balanced.. didn't know these were component balanced thanks for the info
Never did stock just a turbonetics hybrid which wasn't component balanced.. didn't know these were component balanced thanks for the info
sytyguy
Moderated User
Re: Rebuilding Turbo
Just reread my earlier posts and realized I was calling the radial bearings the thrust bearings by accident. Just to clarify, our turbos have two (2) radial bearings and one (1) thrust bearing (often confused as a thrust washer). Here's a radial bearing:
Just reread my earlier posts and realized I was calling the radial bearings the thrust bearings by accident. Just to clarify, our turbos have two (2) radial bearings and one (1) thrust bearing (often confused as a thrust washer). Here's a radial bearing:
It's just a six
Super Member
Re: Rebuilding Turbo
It's always better to balance the turbine wheel & compressor as one unit.
Talk w/Garrett if you have any doubt.:2cents:
It's always better to balance the turbine wheel & compressor as one unit.
Talk w/Garrett if you have any doubt.:2cents:
sytyguy
Moderated User
Re: Rebuilding Turbo
Garrett turbos (excluding prod. HTT obviously) have component balanced wheels but a non-component balanced shaft, axial thrust spacers, and locknut. As a result, Garrett turbos are subject to stackup unbalance. This differs from MHI production pieces. It's like comparing a McLaren to a Dodge. One is hand made and the fit/finish is near perfect. The other is a production unit that has acceptable tolerances so large that it'd make an Italian commit suicide.
Not trying to be an ass, by why would I call Garrett about a Mitsubishi turbo? The OP is referring to his stock turbo. Would it be best to have the entire rotating assembly balanced together? Of course....but that wasn't question. The question was about simplicity......and it simply isn't required.
Garrett turbos (excluding prod. HTT obviously) have component balanced wheels but a non-component balanced shaft, axial thrust spacers, and locknut. As a result, Garrett turbos are subject to stackup unbalance. This differs from MHI production pieces. It's like comparing a McLaren to a Dodge. One is hand made and the fit/finish is near perfect. The other is a production unit that has acceptable tolerances so large that it'd make an Italian commit suicide.