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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 09-18-2013, 02:44 PM   #41
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Insulting new members has always been a MT tradition, but we're trying to clean up our reputation on MT a little bit, so insults without added help before or afterwords will not be tolerated.

OP, we do speak the truth. Throw that turbo away or sell it. It truly is worthless, have another look at my compressor map post. You'll be straining the everliving **** out of it for 9hp more than stock.

Find an SR20 turbo, they can be had for $50-$150 all over the internet. Rebuild it from gopopshop.com for $100.

Buy one of the cast log manifold off ebay. They're $125. All other manifolds WILL fail within ~2 weeks.

The next hardest part will be fabricating a downpipe. An exhaust shot should be able to make a crush bent DP for relatively cheap if you bring them a $20 flange.

Go ahead and use the voodoo box, however as others have hinted, a MS1 can be found for WAY under $1000. Even under $400. So yes, when the voodoo box is $415, there really is no excuse to run it instead of a megasquirt. And as said above, if you can't afford the fueling (in this case MS is the cheapest option), you can't afford to turbocharge the car.

If the ebay manifold and custom downpipe seem daunting, another option is a new or used FM or BEGI cast manifold, their downpipes (again, new or used) are pretty easy to find online.

Good luck with the rest, we'll try to give some more useful advice along the way.
Thank you. My biggest thing against ms is I can't do the DIY. Just not that good with electronics. Cut and splice I can handle. Let me get home and check my other turbo. It's also a garret but I fear it may be too big for a 1.8. I've been looking on eBay and a few other sights for a cast manifold but cheapest I saw was new and $400. Idk I may just be looking in the wrong places. I may just fabricate my own manifold as I can machine and weld with decent quality and I think I can do it for less. I can also do the down pipe so that shouldn't be an issue. Mostly just need to worry about the turbo, timing, and fuel. I know the ms is better but is vodoo truly that bad? I just don't see fm making it if it was I know this won't be the best or cutting edge or anything. But if I need that fast I can drive the race car. Just wanted more go from the miata and everyone said na is worthless and n2o isn't my thing. That left me with turbo
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Old 09-18-2013, 03:01 PM   #42
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Thank you. My biggest thing against ms is I can't do the DIY. Just not that good with electronics.
Maybe it's a good time to learn?

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I know the ms is better but is vodoo truly that bad? I just don't see fm making it if it was
IMO the voodoo is great for 50-year-olds who just had their midlife crisis and want someone to make their gay little car faster. They will keep it under 5000rpms so as to not upset their chrome vent rings or spoil their cheese. You are 19, you will not be happy with the voodoo. If you ragequit and leave, in a few months after you install the doodoo system you will get bored and turn the boost up. At which point you will blow your engine and come crawling back for the part out.

Or, you can take this opportunity to learn from the experts (not me, the people who have actually done it). Sell all your turbos. Sell the doodoo box. Start reading about EFI and electronics. Build a MS, learn to tune NA, save up money for turbo parts.

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I know this won't be the best or cutting edge or anything. But if I need that fast I can drive the race car. Just wanted more go from the miata and everyone said na is worthless and n2o isn't my thing. That left me with turbo
Yeah you definitely don't have enough money to turbo if you can't afford a basic standalone. What happens when your WI system goes empty during a WOT pull? Your piggyback no longer has enough fuel to avoid det and your rods go on holiday. Now you have no miata.
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Old 09-18-2013, 03:04 PM   #43
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Building a manifold is not a bad option if you can fabricate, but going into it without knowing a few things is a recipe for failure.
These engines suffer from some unusual vibration issues at high rpm which will break turbo manifolds that would be fine on other cars. In the honda world people build big pretty manifolds with thin stainless and they seem to hold up for a while. The same manifold on a Miata would probably fail on the street... quickly.
Build yourself a log manifold out of some pipe, and it will work well at stock bottom end power levels, wont break, and be cheap/easy to build.

The Voodoo box works with stock injectors, or slightly oversized injectors (~300cc). Usually it has to be "tuned" to maximum fuel enrichment on any turbo setup. It just doesnt have a way to deliver the fuel needed.
It will technically work, but it will run poorly and you will be limited to very low boost.

The best thing to do is to slow down a bit on the turbo stuff and work on getting your car running on MS with bigger injectors.
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Old 09-18-2013, 03:23 PM   #44
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I learned to solder the first time I built a ms. That box fired right up the first time and has been running for almost five years now without issue. Seriously if you follow the miataturbo wiki write up you can build one without any clue as to what you are doing. Learning to tune it is another issue for some though...
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Old 09-18-2013, 03:39 PM   #45
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I don't know how to solder though and ms is an expensive way to learn. But I'll look at the write up and see if I think I can. And you have to buy all kinds of sensors for ms as well don't you? I think I would be happy at 8psi and from what I've read you don't want to pass 12 on a stock bottom end anyway. And what size pipe should I use for the manifold? As for meth I was mostly wanting it as a safety. Not to max power output. Ideally if have an intercooler to
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Old 09-18-2013, 03:44 PM   #46
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You don't know how to solder, but you do know how to make a manifold? Forgive me, but that's a little unbelievable.


You won't know what sensors you may or may not need to buy until you do some reading. Many of the stock sensors can be used, but you don't really need "all kinds of sensors" to run a car, anyways.

Psi means nothing. Almost quite literally, nothing.

Meth is a band-aid for bad tuning. It's not a safety measure. It's another system to fail and waste money on.


Get your read on, homeboy.
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Old 09-18-2013, 03:45 PM   #47
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Old 09-18-2013, 03:54 PM   #48
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Seriously don't know how. Never had the need to learn. But I've had classes in welding machining ect. And why is meth a bandaid? From my understanding it raises octane and makes a big drop in intake temps. Sounds good to me
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Old 09-18-2013, 03:59 PM   #49
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Seriously don't know how. Never had the need to learn. But I've had classes in welding machining ect. And why is meth a bandaid? From my understanding it raises octane and makes a big drop in intake temps. Sounds good to me
Because you're talking about a turbo setup that so far, might be lucky to get you to 150whp. You shouldn't need to "raise octane" or make a big drop in intake temps.

If you go at this the right way, you won't need meth.

I purchased a meth setup.

I purchased a meth setup so i can attempt to keep my pistons from ******* exploding when i achieve 30psi or more on pump gas while running on an old school modified stock ECU.


Don't be me.
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Old 09-18-2013, 04:06 PM   #50
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So if I was shooting for ~180whp just intercooler would be fine? ( different turbo)
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Old 09-18-2013, 04:08 PM   #51
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"Just" intercooler would be fine for 800whp.


Get your read on. This is basic stuff that you should understand months before you even start collecting parts.
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Old 09-18-2013, 04:14 PM   #52
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If you know how to tig weld, you know how to solder. Source: I learned to tig weld before I learned to solder.

Replace "torch" with "soldering iron" and replace "arc length" with "holding the iron against the wires" and it becomes exactly the same as welding.

Meth won't lower your intake temps (maybe slightly), you want an intercooler for that.

But seriously, if you want to do this on the cheap, you need to STOP POSTING right now and start reading. Start in the build threads section, and stop when you get to threads so old that they don't have pictures. You will find most, if not all, of your questions answered.
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Old 09-18-2013, 04:16 PM   #53
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Bruh just get an e-cool setup or 3.
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Old 09-18-2013, 05:17 PM   #54
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Seriously don't know how. Never had the need to learn. But I've had classes in welding machining ect. And why is meth a bandaid? From my understanding it raises octane and makes a big drop in intake temps. Sounds good to me
Soldering is like welding for infants. If you know how to weld you should be able to solder the pattern "Starry Night" with a harbor freight pen out of a bundle of wires with your eyes closed after 12 beers.
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Old 09-18-2013, 06:03 PM   #55
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So last question. Can my miata run either of these turbos reasonably?
Garret 7844. Ar .60 or
Garret (can't find the number but it's in between the above and the 1752) the ar is 1.15
I have pics but idk how to attach them
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Old 09-18-2013, 06:08 PM   #56
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dude, no. lol
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Old 09-18-2013, 06:12 PM   #57
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So last question. Can my miata run either of these turbos reasonably?
Garret 7844. Ar .60 or
Garret (can't find the number but it's in between the above and the 1752) the ar is 1.15
I have pics but idk how to attach them
Stop.

Drop.

Read.




This is rapidly approaching the ridiculous.
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Old 09-18-2013, 06:24 PM   #58
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Stop.

Drop.

Read.




This is rapidly approaching the ridiculous.
Seriously, the level of **** in this thread has my head spinning.

I've been able to hold my tongue for 3 pages... But i'm sorry. I can't any longer.


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Old 09-18-2013, 06:32 PM   #59
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Lol. Sorry. Had to post the 7844. I know it won't work. But seriously with the other. If I can find the number ill post it unless the ar tells you anything. But it's about 2.5-3inch in/out on both sides
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Old 09-18-2013, 06:35 PM   #60
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Deere is spelled with an "e" on the end.


That is all I have.
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