Advice needed, chinacharger vs sr20 Pics added 3/10 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 03-08-2016, 09:36 AM   #1
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2015
Location: Lakeland Florida 33805
Posts: 56
Total Cats: 2
Default Advice needed, chinacharger vs sr20 Pics added 3/10

I don't post here very much because I am still reading and learning, but Ive come across a situation where I need some advice.

I bought some used turbo stuff- a FM cast iron manifold, FM cast upper and SS intermediate downpipe, and a Garret SR20 turbo. After cracking open the turbo to measure the bearing size, I believe I overpaid. The turbo itself was only $80, but from the beginning it was missing the external wastegate actuator. After taking it apart I found a damaged turbine impeller. It looks like it ground something at its outermost diameter. The housing is unaffected. From the assembled view (upper downpipe removed) the impeller looked fine, but it clearly is not usable.

So my problem is, after I buy a turbine impeller and shaft (~$100), a wastegate actuator (~$45) and a rebuild kit (~$40), I can buy a new chinacharger on EBay.

What would you do?

Last edited by alsmedic; 03-10-2016 at 11:18 AM.
alsmedic is offline   Reply With Quote
Old 03-08-2016, 09:51 AM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

which chinacharger? there's like 300 different ones to choose from.

that's like saying should I buy a red car or a corvette?


pics of turbo now please.
Braineack is offline   Reply With Quote
Old 03-08-2016, 09:51 AM   #3
Junior Member
 
Join Date: Jan 2016
Posts: 441
Total Cats: 21
Default

Buy a chinacharger, when you replace the turbine I'm pretty sure you'd need to send it out to get rebalanced too
Forrest95M is offline   Reply With Quote
Old 03-08-2016, 09:55 AM   #4
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2015
Location: Lakeland Florida 33805
Posts: 56
Total Cats: 2
Default

Any suggested chinacharger.... Similarly sized, so the t25 flange on my manifold will work. My goal is a fairly dependable and durable system, with a max HP of about 220 or so.
I guess my question was really is a Garret sr20 with this many issues going to be any better durability wise, vs price, than a new similar sized chinacharger?
alsmedic is offline   Reply With Quote
Old 03-08-2016, 09:58 AM   #5
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2015
Location: Lakeland Florida 33805
Posts: 56
Total Cats: 2
Default

[QUOTEBuy a chinacharger, when you replace the turbine I'm pretty sure you'd need to send it out to get rebalanced too][/QUOTE]

I think this too- except that I read when you buy a turbine wheel it comes balanced on a shaft, ready to install a compressor wheel/nut. I guess it doesn't *require* balancing. How much does balancing the assembly usually cost?
alsmedic is offline   Reply With Quote
Old 03-08-2016, 10:00 AM   #6
Junior Member
 
Join Date: Jan 2016
Posts: 441
Total Cats: 21
Default

That's a great question for the Google search bar
Forrest95M is offline   Reply With Quote
Old 03-08-2016, 10:09 AM   #7
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,174
Total Cats: 2,575
Default

the turbine wheel, shaft, compressor wheel, and nut all get balanced together. it usually costs 80-100. best place to do it is gpop shop.

you need to search moar
18psi is offline   Reply With Quote
Old 03-08-2016, 10:20 AM   #8
Senior Member
iTrader: (1)
 
Join Date: Dec 2010
Location: Farmington Hills, MI
Posts: 873
Total Cats: 93
Default

For a turbo that old, you'd want to balance it. Newer name brand turbos are all component balanced first, and the assembly is checked for balance and it rarely needs altered. I've messed around with changing wheels on some MGT series Honeywell turbos and never needed to rebalance.
acedeuce802 is offline   Reply With Quote
Old 03-08-2016, 10:34 AM   #9
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,775
Total Cats: 1,106
Default

Go find another good Sr20 t25 in the $100-200 range. None of the t25 china chargers are "great" on a miata. Don't waste time or energy rebuilding them. Just go pick up another cheap used one if it breaks.
shuiend is offline   Reply With Quote
Old 03-08-2016, 10:44 AM   #10
Junior Member
 
Join Date: Jan 2016
Posts: 441
Total Cats: 21
Default

Quote:
Originally Posted by shuiend View Post
Go find another good Sr20 t25 in the $100-200 range. None of the t25 china chargers are "great" on a miata. Don't waste time or energy rebuilding them. Just go pick up another cheap used one if it breaks.
I have yet to find a 100-150$ working t25 without a wierd flange, must be few and far between. What about the t25/28 turbo begi sells
Forrest95M is offline   Reply With Quote
Old 03-08-2016, 10:46 AM   #11
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,174
Total Cats: 2,575
Default

it is an utter piece of junk

basically exactly same as ebay, but with a $400 markup
18psi is offline   Reply With Quote
Old 03-08-2016, 10:52 AM   #12
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,775
Total Cats: 1,106
Default

Quote:
Originally Posted by Forrest95M View Post
I have yet to find a 100-150$ working t25 without a wierd flange, must be few and far between. What about the t25/28 turbo begi sells
I have purchased 4 over the past 8 years. 3 of them are still out on cars being used. Get on searchtempest and 240 forums. It shouldn't take you longer then a month to find one.

The t25 Begi uses is garbage. Every t25 chinacharger I have seen dyno for have horrible spool and lackluster power. The t3 chinacharger that I used on my setups is about the best china charger you can get.
shuiend is offline   Reply With Quote
Old 03-08-2016, 10:53 AM   #13
Junior Member
 
Join Date: Jan 2016
Posts: 441
Total Cats: 21
Default

Quote:
Originally Posted by 18psi View Post
it is an utter piece of junk

basically exactly same as ebay, but with a $400 markup
So for 400$ it's rip, but for 200$ it's OK?
Forrest95M is offline   Reply With Quote
Old 03-08-2016, 10:54 AM   #14
Junior Member
 
Join Date: Jan 2016
Posts: 441
Total Cats: 21
Default

Quote:
Originally Posted by shuiend View Post
I have purchased 4 over the past 8 years. 3 of them are still out on cars being used. Get on searchtempest and 240 forums. It shouldn't take you longer then a month to find one.

The t25 Begi uses is garbage. Every t25 chinacharger I have seen dyno for have horrible spool and lackluster power. The t3 chinacharger that I used on my setups is about the best china charger you can get.
I was zilvia.net and couldn't find one for the life of me, guess I know where to find one now
Forrest95M is offline   Reply With Quote
Old 03-08-2016, 10:55 AM   #15
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,174
Total Cats: 2,575
Default

Quote:
Originally Posted by Forrest95M View Post
So for 400$ it's rip, but for 200$ it's OK?
its actually 600 from begi iirc

junk either way, but I'm sure it's more "acceptable" when it's 3x cheaper


the key with finding stuff like this is patience. there isn't a steady supply. you gotta wait for it
18psi is offline   Reply With Quote
Old 03-08-2016, 02:40 PM   #16
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,847
Total Cats: 1,788
Default

Quote:
Originally Posted by Braineack View Post
pics of turbo now please.
I'm curious to see the damage as well...
Braineack is offline   Reply With Quote
Old 03-08-2016, 09:44 PM   #17
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2015
Location: Lakeland Florida 33805
Posts: 56
Total Cats: 2
Default

Sorry I didn't even see the request above for pics. I'll try to get some tomorrow when I'm off work
alsmedic is offline   Reply With Quote
Old 03-08-2016, 10:11 PM   #18
Slowest Progress Ever
iTrader: (26)
 
thirdgen's Avatar
 
Join Date: Oct 2007
Location: The coal ridden hills of Pennsylvania
Posts: 5,806
Total Cats: 183
Default

Send my your sr20 turbo and I will rebuild it for you as I've done for many other members in the past. I have a pile of sr20 parts...I'm pretty sure I have a used turbine wheel/ shaft.
thirdgen is online now   Reply With Quote
Old 03-10-2016, 11:13 AM   #19
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2015
Location: Lakeland Florida 33805
Posts: 56
Total Cats: 2
Default

Sorry for the delay, here are some pics. Sorry again- they are big!















This is not an exact measurement- the caliper couldn't accurately reach the back side-



no visible damage to the housing
Attached Thumbnails
Advice needed, chinacharger vs sr20 Pics added 3/10-img_20160310_094136373.jpg   Advice needed, chinacharger vs sr20 Pics added 3/10-img_20160310_094144383.jpg   Advice needed, chinacharger vs sr20 Pics added 3/10-img_20160310_094503163.jpg   Advice needed, chinacharger vs sr20 Pics added 3/10-img_20160310_094509128.jpg   Advice needed, chinacharger vs sr20 Pics added 3/10-img_20160310_094647636.jpg  

Advice needed, chinacharger vs sr20 Pics added 3/10-img_20160310_094628217.jpg   Advice needed, chinacharger vs sr20 Pics added 3/10-img_20160310_094701109.jpg  
alsmedic is offline   Reply With Quote
Old 03-10-2016, 11:15 AM   #20
Junior Member
Thread Starter
iTrader: (1)
 
Join Date: Aug 2015
Location: Lakeland Florida 33805
Posts: 56
Total Cats: 2
Default

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
alsmedic is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Innovative LC-2 calibration problems Yellowbird87fan ECUs and Tuning 10 03-10-2016 09:34 PM
Can someone get me a hood measurement? acedeuce802 General Miata Chat 4 03-07-2016 09:59 PM
Turbo built? frenchmiata Engine Performance 1 03-05-2016 08:52 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 09:52 PM.