DIY Turbo Discussion greddy on a 1.8? homebrew kit?
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My custom turbo kit

 
Old 11-18-2018, 06:03 PM
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Default My custom turbo kit


https://imgur.com/a/7cyb1L9
Here is my custom built turbo Miata, I fabricated the manifold, charge pipes, coolant pipes, and exhaust. I built this kit last winter and ran a full season of autocross on it, I'll go over the specs later, but first some backstory. I've been a welding for a living almost 10 years and this is my first attempt at anything like this. I've since built 3 more manifolds/turbo kits and have learned a lot, now that the season is over I'm planning to tear it out and rebuild the entire thing better. I'd like to start doing this for a living, I'm planning on building this next one in a way I can reproduce and sell it. Here is my question to you, what would you like to see in a Miata turbo kit that isn't out there? What do you like about the kit I made? What should I change? I figured it would be cool to involve the community in the project, and make something cool that maybe people would want to buy. I understand I went a little too wild with the pie cuts and changing stuff just because I can. My goal is to build something a little bit simpler that can be a bolt on kit.

The current build is on a stock 94 motor with 160,xxx miles, It uses a Garrett GT2560r turbo running 12 PSI, it made 225HP and 215Torque. I'll grab pictures of the dyno sheet next time I'm at my tuners shop. Its a pretty standard Miata set up making pretty standard numbers. Maybe a little more torque than usual?

My plan is to do most of the design on my friends bone stock NB. He wants me to build him a kit and also retain power steering and ac, if it fits his car it will fit my stripped down race car. I plan on changing the manifold to be a top mount turbo design with shorter runner lengths. I'm keeping the same GT2560r turbo but I'm open to suggestions, perhaps an EFR? The charge pipes are aluminum 2 diameter from the turbo and transition to 2.5 about 18 before the throttle body I really like how this improves response and I will probably do the same thing on the new kit. I plan on a 2.5 bell mouth style down pipe I could make a full exhaust system but it seems most kits just include a down pipe? If you want to know more about the current or future kit just ask, i'll provide details and pictures. I'm open to suggestions for any part of this process, and would be willing to start a build post/blog if there's some interest from you lovely people. Once the first 2 kits are built I'd like to be in a position to start a group buy or make a run of kits in the spring or summer of next year.
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Old 11-19-2018, 12:33 AM
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You should probably do some more research before you ask those questions.
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Old 11-19-2018, 01:16 AM
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That's not how you want to connect your wastegate actuator.

You're also letting unfiltered air into your engine through that breather.
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Old 11-19-2018, 01:18 AM
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Originally Posted by The_Defensive_Octopus View Post
Its a pretty standard Miata set up making pretty standard numbers. Maybe a little more torque than usual?
Can't imagine how you'd come up with a better kit than MKturbo for the price, especially if this is all you're going for
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Old 11-19-2018, 01:31 AM
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Coming in hot!

I'd recommend starting with an intro in the meet and greet section. Engage with the community and read a lot to understand what is already out there. It looks like you have a cool build, so focus on that while you settle in here.
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Old 11-19-2018, 05:42 AM
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Originally Posted by nigelt View Post
Coming in hot!

I'd recommend starting with an intro in the meet and greet section. Engage with the community and read a lot to understand what is already out there. It looks like you have a cool build, so focus on that while you settle in here.
Thanks for the tip! I lurked here for a while before and during this build. I'm just looking for criticism from a more educated audience on what I currently have built before I start on the next version of the kit.
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Old 11-19-2018, 05:49 AM
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I'm gonna be hard pressed to beat the mkturbo price, but I don't think that's what I'm going for. I'm hoping there's a niche in the market for a small fabricator making high quality parts. That's why i'm asking what I can improve and what you guys would like to see if you had the option.
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Old 11-19-2018, 06:23 AM
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Originally Posted by SpartanSV View Post
That's not how you want to connect your wastegate actuator.

You're also letting unfiltered air into your engine through that breather.
Whats the best way to connect the waste gate actuator?
Yes having that breather open is annoying, but it's been fine all year. It was a design flaw on my part. the runner passes really close in front of it, and there's no room to put anything on it.
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Old 11-19-2018, 07:23 AM
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2.5" downpipe? What's this all about?

got a dyno chart from this thing? Let's have a look.
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Old 11-19-2018, 07:44 AM
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You are likely going to get roasted for this but I will give you where I would go if i had any welding ability.

MKTurbo and Kraken are the cheapest reliable options out there dependent on global location.
Once you get passed these you get the big boy toys from TSE with EFRs and such. You do not have the required track thrashed endurance testing they have completed to be viable up there.

Which leaves you with basically nothing.
Do not be disheartened though.
Absurdflow did manifolds that were exquisite. They also catered for everyone right from the off. Do you have ABS, PS and AC but want to fit that 2871? Its fine.
This is where fabrication gets its legs back. Squeezing kit into a space with all the annoyances still present.
  1. A well packaged low mount compatible with ABS, PS and AC is suitable for literally everyone (whether they have those things is irrelevant if you have worked around them) so more likely to sell.
  2. 2.75" and 3" turbo to cat V-band exhaust. 2.5" is too small for a 1.6 let alone a 1.8 so don't bother.
  3. IC end tanks for some sizes which have the turbo outlet size for one and the TB inlet for the other.

These sorts of questions are very well documented here so I would suggest you look up TurboTim's creations as well as anything the Savington has touched. Emilio is not to be missed either. Its the better part of 150k worth of posts there i reckon but its all about breaking ideas like yours and making them better. Your design is not what most have for reasons contained in those posts.
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Old 11-19-2018, 10:29 AM
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I see a few questionmarks but the questions are questionable.
efr's are cool. you wouldn't want 2.5" exhaust unless you have a specific reason.

I would redesign the manifold so you don't need to cheat any bends next time, and maybe reduce the amount of 90's you need when you can use a few shorter angle bends to get to the area you want.
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Old 11-19-2018, 11:14 AM
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Originally Posted by The_Defensive_Octopus View Post
I'm gonna be hard pressed to beat the mkturbo price, but I don't think that's what I'm going for. I'm hoping there's a niche in the market for a small fabricator making high quality parts. That's why i'm asking what I can improve and what you guys would like to see if you had the option.
IMO your kit looks a lot nicer than the MK Turbo kit which uses a log manifold and ebay turbo. Its funny that he was the first to reply to your thread since he knows hes going to have competition.
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Old 11-19-2018, 11:26 AM
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Shots fired.
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Old 11-19-2018, 11:26 AM
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I'd rather a log manifold and a T3 based turbo. That manifold isn't going to live long under hard use.

The price point that this setup would have to hit to make sense is going to slot it in weird no-man's land where nobody is going to buy. Within a few hundred of a Trackspeed setup, way more than MKTurbo, less durable than a Kraken.

Solid "meh."
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Old 11-19-2018, 11:32 AM
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Originally Posted by concealer404 View Post
I'd rather a log manifold and a T3 based turbo. That manifold isn't going to live long under hard use.

The price point that this setup would have to hit to make sense is going to slot it in weird no-man's land where nobody is going to buy. Within a few hundred of a Trackspeed setup, way more than MKTurbo, less durable than a Kraken.

Solid "meh."
Sure a long runner EQ style manifold doesnt live as long but its definitely the most efficient design for making power. There is a lot of competition for sure. TSE and Kraken have great cast manifolds that really dont have any issues with cracking. Why do you prefer a T3 based manifold? The T2 flanged stuff is far better for a Miata IMO, covers all the GT25/28 Garrett turbos and the EFR lineup.
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Old 11-19-2018, 11:34 AM
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Originally Posted by andyfloyd View Post
Sure a long runner EQ style manifold doesnt live as long but its definitely the most efficient design for making power. There is a lot of competition for sure. TSE and Kraken have great cast manifolds that really dont have any issues with cracking. Why do you prefer a T3 based manifold? The T2 flanged stuff is far better for a Miata IMO, covers all the GT25/28 Garrett turbos and the EFR lineup.
Because T25 downpipes are gross.

If i want a T2, then i'm getting a Trackspeed manifold. If i don't want a cast manifold, i'm getting a log, because it'll hold together much better.

Unless this setup ALSO fits an EFR (it doesn't), it doesn't really bring any advantages to the market compared to what we already have available to us.

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Old 11-19-2018, 11:36 AM
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Originally Posted by concealer404 View Post
Because T25 downpipes are gross.

If i want a T2, then i'm getting a Trackspeed manifold. If i don't want a cast manifold, i'm getting a log, because it'll hold together much better.

Unless this setup ALSO fits an EFR (it doesn't), it doesn't really bring any advantages to the market compared to what we already have available to us.
T25 downpipes are gross? That makes no sense

You can get a T25 vband housing instead of the 5 bolt, and even with a 5 bolt how is it gross? He also said he would want to redesign the manifold to accept different turbos such as an EFR. I think its funny that people are ragging on this guy who obviously has some skill in designing a nice kit.
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Old 11-19-2018, 11:47 AM
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Originally Posted by The_Defensive_Octopus View Post
Whats the best way to connect the waste gate actuator?
Preferably pre throttle body... https://www.miataturbo.net/diy-turbo...eed-ebc-47532/

Originally Posted by The_Defensive_Octopus View Post
Yes having that breather open is annoying, but it's been fine all year. It was a design flaw on my part. the runner passes really close in front of it, and there's no room to put anything on it.
Uhhhhh... Isn't there a concern for possible blow by under high load? Especially in a boosted motor? Doesn't Oil + Hot Manifold = Fire?
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Old 11-19-2018, 11:50 AM
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Originally Posted by HmoobDude View Post
Preferably pre throttle body... https://www.miataturbo.net/diy-turbo...eed-ebc-47532/



Uhhhhh... Isn't there a concern for possible blow by under high load? Especially in a boosted motor? Doesn't Oil + Hot Manifold = Fire?
They see you hatin'
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Old 11-19-2018, 11:51 AM
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Originally Posted by andyfloyd View Post
T25 downpipes are gross? That makes no sense

You can get a T25 vband housing instead of the 5 bolt, and even with a 5 bolt how is it gross? He also said he would want to redesign the manifold to accept different turbos such as an EFR. I think its funny that people are ragging on this guy who obviously has some skill in designing a nice kit.
5 bolt flange outlets are gross and annoying.

V band is cool. Sounds fine. Sounds like more money to put into an outdated turbo that doesn't do anything better than the current hotness which again, i repeat, will not cost much more. And will come with a more durable manifold that has actually be track tested.

I PERSONALLY have zero, literally ZERO interest in a hentai tentacle **** manifold in my car. For any reason. Sure, it might make more power somewhere. It might be more efficient somewhere. If you're making the sort of power where that matters (You're not, i'm not, nobody in this thread is), then it matters. Until then, it's nothing more than a liability.

I'm not ragging on him. Looks like he did a good job in general. I'm simply saying that the kit is going to fall into no man's land and there's not much market for it. At least not on these forums. There's no ragging, let's not perpetuate early 20s millenial-isms, especially when you're the one that threw shade at Lars right off the bat.
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