MKTurbo Black Friday 2025 Sales Thread
Thread Starter
Joined: May 2006
Posts: 15,235
Total Cats: 1,700
From: Charleston SC
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Thread Starter
Joined: May 2006
Posts: 15,235
Total Cats: 1,700
From: Charleston SC
I already have a large enough audience in the USA to sell to. I have more people interested then I can honestly handle at this time. I don't have a large desire to keep getting bigger and bigger.
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Newb
Joined: Dec 2015
Posts: 29
Total Cats: -2
From: Charlotte NC
I have about 500 miles on the kit. was dealing with some boost creep issues, ended up taking the turbo back off and porting some more. no creep now holds around 9 psi. car is an absolute blast to drive.
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Thread Starter
Joined: May 2006
Posts: 15,235
Total Cats: 1,700
From: Charleston SC
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Junior Member
Joined: Aug 2015
Posts: 449
Total Cats: 28
From: Boston,Mass
Also enjoying my setup.. got my car tuned last night on a hub and axle dyno - and ran into alot of problems with overboosting at the dyno due to me not porting the wastegate enough (also blew my piping off a few times)
I should've ported way more.. now i have to go back !.. pushing about 14psi right now.. around 180-220hp car is still hella fun but it has a lazy boost curve.
Will post my dyno graph once i re-port wastegate and get it re-tuned with ebc
I should've ported way more.. now i have to go back !.. pushing about 14psi right now.. around 180-220hp car is still hella fun but it has a lazy boost curve.
Will post my dyno graph once i re-port wastegate and get it re-tuned with ebc
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Thread Starter
Joined: May 2006
Posts: 15,235
Total Cats: 1,700
From: Charleston SC
Also enjoying my setup.. got my car tuned last night on a hub and axle dyno - and ran into alot of problems with overboosting at the dyno due to me not porting the wastegate enough (also blew my piping off a few times)
I should've ported way more.. now i have to go back !.. pushing about 14psi right now.. around 180-220hp car is still hella fun but it has a lazy boost curve.
Will post my dyno graph once i re-port wastegate and get it re-tuned with ebc
I should've ported way more.. now i have to go back !.. pushing about 14psi right now.. around 180-220hp car is still hella fun but it has a lazy boost curve.
Will post my dyno graph once i re-port wastegate and get it re-tuned with ebc
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Newb
Joined: Jul 2015
Posts: 2
Total Cats: 0
From: Southern Tier of NY
Hello there. My son and I just finished installing an MKTurbo kit on his Miata. We didn't port the wastegate (our first turbo). Now we know why we need to and what happens when you don't. So I'm reading and learning before breaking out the grinder. Do I understand you when you say that you did not channeling that you ONLY enlarged the hole and did NO porting in the air tract or anything else? Just enlarged the hole? I see the BEGI write up showing the channel. Not sure what way to go and I'm just trying to learn as much as I can before chips start flying. Thanks for any detail you can offer on this.
For everyone getting their kits and doing their porting, I've been asked a few times how I did mine. I looked back and it looks like I was inconsiderate and didn't take pictures of the completed port job. However, the picture below shows everything you need to know about my port job. I put chalk on the flapper and closed it a few times to leave a chalk outline of the flapper. I outlined that with sharpie, then set to work.
Sharpie line is where the outline of the flapper. Red line is approximately where I cut out.
The only thing I did was enlarge the hole, leaving about a 2mm rim all the way around to make a good seal with the flapper. I took measurements before and after, and this added about 30% to the area. Airflow is proportional to the area of the hole, so this allows 30% more airflow. The whole thing took 1 hour including taking apart the turbo, measuring, cutting, cleaning, and putting it back together.
The result is that when the wastegate is wired open, I get no positive boost (less vacuum than full vacuum, but less than 100kpa) all the way to redline. With the wastegate in action, no boost creep.
Also, for the record, I did no channeling, which IMHO is for people who don't understand physics.
Sharpie line is where the outline of the flapper. Red line is approximately where I cut out.
The only thing I did was enlarge the hole, leaving about a 2mm rim all the way around to make a good seal with the flapper. I took measurements before and after, and this added about 30% to the area. Airflow is proportional to the area of the hole, so this allows 30% more airflow. The whole thing took 1 hour including taking apart the turbo, measuring, cutting, cleaning, and putting it back together.
The result is that when the wastegate is wired open, I get no positive boost (less vacuum than full vacuum, but less than 100kpa) all the way to redline. With the wastegate in action, no boost creep.
Also, for the record, I did no channeling, which IMHO is for people who don't understand physics.
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Junior Member
Joined: Aug 2015
Posts: 449
Total Cats: 28
From: Boston,Mass
Heres my initial porting.. i didn't go very far..
Took my turbo off this friday to do some more porting and snapped a few more pictures - it should give you an idea how far i ported.. it still isnt enough.. even after adjusting my preload im seeing it creep ( I did a rough trace that you can see in the image - went out about that far - this was not the finished product. )
I am still dealing with boost creep issues which i most likely will tackle again sometime this week
Took my turbo off this friday to do some more porting and snapped a few more pictures - it should give you an idea how far i ported.. it still isnt enough.. even after adjusting my preload im seeing it creep ( I did a rough trace that you can see in the image - went out about that far - this was not the finished product. )
I am still dealing with boost creep issues which i most likely will tackle again sometime this week
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Here is my most recent port, basically a copy of NigelT's. I get creep on wastegate but only to about 9 psi IIRC. I did no channeling and just radiused the transition a tiny bit so it wasn't a sharp edge.
I have done both port styles and the only real difference seems to be my EBC settings. I needed to enlarge the hole some on my first channeled port to stay under 10psi or so.
This is my copy of NigelT's port.
I have done both port styles and the only real difference seems to be my EBC settings. I needed to enlarge the hole some on my first channeled port to stay under 10psi or so.
This is my copy of NigelT's port.
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