Advice needed, chinacharger vs sr20 Pics added 3/10
03-10-2016, 11:22 AM
#21
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if a compressor wheel has been balanced, and a turbine wheel has been balanced, logic suggests it will still remain balanced when put together.
buy a new/used turbine. replace the bearings/piston rings. slap it on. enjoy blowing your motor with massive boost.
buy a new/used turbine. replace the bearings/piston rings. slap it on. enjoy blowing your motor with massive boost.
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03-10-2016, 11:44 AM
#24
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my logic has never failed me.
I've probably cobbled together 5 Frankenstein turbos and never had an issue with them
the only turbo i ever has an issue with was the one I paid WAY too much money for, whose wheel hit the compressor housing cause the shop MJM Turbos has no ******* clue what they are doing. The owner of the place hung up on me multiple times.
they blamed me because I rotated the compressor housing.
I will quote here:
I ended up paying to have it "repaired" since they were holding it hostage. when I got it back, it hadn't been touched still did the same thing (AND TO TOP IT OFF--they roated the turbo back, so i still had to clock it again to fit my installation).
I ended up swapping out the compressor wheel and housing and ran that turbo for years. then i changed the wheel and compressor again, and ran for more. then i changed the chra. then the turbine wheel. and i think one other combination i cant remember. rebuilt it at least twice, changed out the thrust bearing as well. ask me how many times i got it balanced.
i was going to swap the chinacharger wheel and compressor housing on it but the chinacharger worked so well i saw no point to try.
If I was in this situation, knowing everything I know today, I'd still just buy a new turbine, rebuild the chra, and slap it all together and run it. I'd be more concerned with the tolerances of my bearings than any balancing. If I was talking about a turbo that cost more than an hours pay, i might respond differently.
I've probably cobbled together 5 Frankenstein turbos and never had an issue with them
the only turbo i ever has an issue with was the one I paid WAY too much money for, whose wheel hit the compressor housing cause the shop MJM Turbos has no ******* clue what they are doing. The owner of the place hung up on me multiple times.
they blamed me because I rotated the compressor housing.
I will quote here:
Scott,
I spoke to him and he clearly said that the turbo hits the wall.
When they assemble the turbo, they balance the wheels.
Then they will put the turbo in a strobe light and make sure does not hit the wall in hi-speed.
When you turn the housing, a slight **** eyed position or if the torque of the bolt is not even the blade will hit the wall once it reaches 800 to 900 degrees. The turbo parts contract/expand.
There is very little tolerance in the wall.....not even .4 thousandt.
Tell you what, if I can ask him to repair it and you pay for the parts will you go along?
info@mjmturbos.com
I spoke to him and he clearly said that the turbo hits the wall.
When they assemble the turbo, they balance the wheels.
Then they will put the turbo in a strobe light and make sure does not hit the wall in hi-speed.
When you turn the housing, a slight **** eyed position or if the torque of the bolt is not even the blade will hit the wall once it reaches 800 to 900 degrees. The turbo parts contract/expand.
There is very little tolerance in the wall.....not even .4 thousandt.
Tell you what, if I can ask him to repair it and you pay for the parts will you go along?
info@mjmturbos.com
I ended up paying to have it "repaired" since they were holding it hostage. when I got it back, it hadn't been touched still did the same thing (AND TO TOP IT OFF--they roated the turbo back, so i still had to clock it again to fit my installation).
I ended up swapping out the compressor wheel and housing and ran that turbo for years. then i changed the wheel and compressor again, and ran for more. then i changed the chra. then the turbine wheel. and i think one other combination i cant remember. rebuilt it at least twice, changed out the thrust bearing as well. ask me how many times i got it balanced.
i was going to swap the chinacharger wheel and compressor housing on it but the chinacharger worked so well i saw no point to try.
If I was in this situation, knowing everything I know today, I'd still just buy a new turbine, rebuild the chra, and slap it all together and run it. I'd be more concerned with the tolerances of my bearings than any balancing. If I was talking about a turbo that cost more than an hours pay, i might respond differently.
Last edited by Braineack; 03-10-2016 at 11:56 AM.
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03-10-2016, 11:49 AM
#25
Slowest Progress Ever
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Thirdgen- do you work at a turbo shop? Can you do balancing? I have no problem rebuilding the turbo myself aside from farming out the balancing job and sourcing a turbine. Ive already taken this one completely apart to measure the bearing sizes. Would you sell me a used turbine impeller? How much? Thanks
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03-10-2016, 12:09 PM
#26
i was going to swap the chinacharger wheel and compressor housing on it but the chinacharger worked so well i saw no point to try.
If I was in this situation, knowing everything I know today, I'd still just buy a new turbine, rebuild the chra, and slap it all together and run it. I'd be more concerned with the tolerances of my bearings than any balancing. If I was talking about a turbo that cost more than an hours pay, i might respond differently.
I can forward you the text
I mean, it's a $100 t25. Even with rebuild you're looking at $200. So I guess not a terrible loss if it does 'splode from being unbalanced
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03-10-2016, 12:26 PM
#27
My experience:
1. Acquire $120 SR20 t25 in need of lovin
2. Poorly mark the position of the nut-compressor-shaft alignment
3. Disassemble and put in G-pop rebuild stuffs
4. Reassemble and realize I can hardly see the alignment marks I made
5. Guess... close enough.
6. Spend lots of time researching and worrying about the explodey possibility of a massive $200 loss
7. Drive daily for 3 years and 40k miles with zero issues
8. Post anecdotal evidence on forum that may or may not work for you
Wish they would just balance each component individually so this was never a concern.
1. Acquire $120 SR20 t25 in need of lovin
2. Poorly mark the position of the nut-compressor-shaft alignment
3. Disassemble and put in G-pop rebuild stuffs
4. Reassemble and realize I can hardly see the alignment marks I made
5. Guess... close enough.
6. Spend lots of time researching and worrying about the explodey possibility of a massive $200 loss
7. Drive daily for 3 years and 40k miles with zero issues
8. Post anecdotal evidence on forum that may or may not work for you
Wish they would just balance each component individually so this was never a concern.
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