MKturbo where's all the boost going? - Miata Turbo Forum - Boost cars, acquire cats.

Prefabbed Turbo Kits A place to discuss prefabricated turbo kits on the market
Sponsored by:
Sponsored by:

MKturbo where's all the boost going?

Old 06-24-2018, 02:48 AM
  #1  
Junior Member
Thread Starter
 
Join Date: Oct 2015
Location: alberta canada
Posts: 62
Total Cats: 5
Default MKturbo where's all the boost going?

I've recently got my complete mkturbo intercooler plus electronics kit in my vehicle. I performed all the basics to get it up and running good and in boost. I have EBC set up properly, brought it to get it dyno tuned. We went through the whole fuel load range on the dyno. Did a power run on wastegate pressure to confirm everything is functioning as it should. Then when it came time to turn up the boost and start making some more power the most we could get out of the system was approx 10.5lbs. 40% duty gave 10.5 60% duty have 10.5, 80% duty gave 10.5 and 100% duty on the EBC gave 10.5, confirmed this by watching the wastegate actuator it is holding shut the whole time no movement at all. These were all done back to back pulls and all made within 2hp/2tq of each other each time. Looking for suggestions as to what the experts think is going on. Is the turbosmart blow off valve a knock off one that comes with the kit and is leaking boost off, or is the intercooler just too restrictive causing that to be the max number it's capable of?
97eunos is offline  
Old 06-24-2018, 06:40 AM
  #2  
Elite Member
 
Join Date: Apr 2010
Location: Newcastle, Australia
Posts: 2,812
Total Cats: 51
Default

melted cat or boost leak, assuming that the engine is working as it should.

Dann
nitrodann is offline  
Old 06-24-2018, 07:04 AM
  #3  
Elite Member
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit (the part with no rules or laws)
Posts: 4,710
Total Cats: 361
Default

Build a cheap boost leak tester.
Erat is offline  
Old 06-24-2018, 10:31 AM
  #4  
Elite Member
iTrader: (8)
 
Join Date: Apr 2013
Posts: 2,445
Total Cats: 214
Default

Biggest thing I did with my MKTurbo was to put an oring in the compressor seal. It never came with one. After that, and sealing the WG bracket bolts where they go into the compressor it held 15psi no problem. IIRC, $5 for T3 oring on eBay.
bahurd is offline  
Old 06-24-2018, 01:07 PM
  #5  
Junior Member
Thread Starter
 
Join Date: Oct 2015
Location: alberta canada
Posts: 62
Total Cats: 5
Default

Originally Posted by nitrodann
melted cat or boost leak, assuming that the engine is working as it should.

Dann
No emissions regulations where I am, I remove cats as soon as I purchase the vehicles. I believe at work we have a boost leak tester with various sizes for testing for boost leaks on Cummins as well as 3.0 eco diesel (work at a dodge dealer).
97eunos is offline  
Old 06-26-2018, 10:21 AM
  #6  
Senior Member
 
Join Date: Oct 2013
Location: NorthWest NJ
Posts: 1,310
Total Cats: 63
Default

Sounds like a boost leak. My friend had an MK turbo kit and had thenopposute problem. It wouldn't make less than 14psi up top.
x_25 is offline  
Old 06-27-2018, 03:13 AM
  #7  
Junior Member
Thread Starter
 
Join Date: Oct 2015
Location: alberta canada
Posts: 62
Total Cats: 5
Default

Originally Posted by bahurd
Biggest thing I did with my MKTurbo was to put an oring in the compressor seal. It never came with one. After that, and sealing the WG bracket bolts where they go into the compressor it held 15psi no problem. IIRC, $5 for T3 oring on eBay.
Could you possibly send me a link to which seal you ordered if it's still available
97eunos is offline  
Old 06-27-2018, 09:02 AM
  #8  
Elite Member
iTrader: (8)
 
Join Date: Apr 2013
Posts: 2,445
Total Cats: 214
Default

Originally Posted by 97eunos View Post
Could you possibly send me a link to which seal you ordered if it's still available
Sure, here you go: T3 Turbocharger Compressor Housing Gasket

There's also at least 2 of the bolts that hold the compressor on that extend into the compressor. I used teflon tape to seal the threads on those bolts. Don't over tighten them as they strip easy.
bahurd is offline  
Old 06-27-2018, 10:32 AM
  #9  
Junior Member
Thread Starter
 
Join Date: Oct 2015
Location: alberta canada
Posts: 62
Total Cats: 5
Default

Originally Posted by bahurd
Sure, here you go: T3 Turbocharger Compressor Housing Gasket

There's also at least 2 of the bolts that hold the compressor on that extend into the compressor. I used teflon tape to seal the threads on those bolts. Don't over tighten them as they strip easy.
Yeah I notice 3 on mine that go through, thanks again
97eunos is offline  
Old 06-28-2018, 09:35 PM
  #10  
Junior Member
Thread Starter
 
Join Date: Oct 2015
Location: alberta canada
Posts: 62
Total Cats: 5
Default

photo328.jpg so I found out where all my boost is going, the flapper on the turbo does not line up with the wastegate hole one little bit. Also found a couple spots where boost is coming through some welds and the where the turbo compressor housing mates to chra.
photo497.jpgphoto198.jpgphoto265.jpg
Does anyone have any ideas on the wastegate for how to fix it?photo491.jpg it turns out that this shaft can slide up and down freely as it chooses (or as gravity pushes it down)
97eunos is offline  
Old 06-28-2018, 10:56 PM
  #11  
Elite Member
iTrader: (5)
 
Erat's Avatar
 
Join Date: Oct 2011
Location: Detroit (the part with no rules or laws)
Posts: 4,710
Total Cats: 361
Default

Gotta love the boost leak tester.

Yeah, that arm should not slide up and down. I would assume there should be a C clip on it or something to retain it in place. Though i don't know exactly how these turbos work, i do know that's not right.
Erat is offline  
Old 06-28-2018, 10:58 PM
  #12  
Junior Member
Thread Starter
 
Join Date: Oct 2015
Location: alberta canada
Posts: 62
Total Cats: 5
Default

Originally Posted by Erat
Gotta love the boost leak tester.

Yeah, that arm should not slide up and down. I would assume there should be a C clip on it or something to retain it in place. Though i don't know exactly how these turbos work, i do know that's not right.
No c clip and no groove for one to sit in, I'm going to see what clips I have laying around and make my own groove to make it stay up
97eunos is offline  
Old 06-29-2018, 12:02 AM
  #13  
Junior Member
Thread Starter
 
Join Date: Oct 2015
Location: alberta canada
Posts: 62
Total Cats: 5
Default

photo812.jpg
And problem solved, gently used a cut-off disc and made a groove then fouls and e-clip that fit around it nicely. need to re-assemble and will report back incase anyone else runs into the issue.
97eunos is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Colipto
Miata parts for sale/trade
12
05-02-2017 04:24 PM
hdizzle
Cars for sale/trade
28
12-13-2016 12:45 PM
Lexzar
DIY Turbo Discussion
31
12-07-2016 09:41 AM
Corifto
DIY Turbo Discussion
9
07-31-2016 02:51 AM
njn63
Miata parts for sale/trade
8
07-31-2016 01:12 AM


Thread Tools
Search this Thread
Quick Reply: MKturbo where's all the boost going?


Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.