First turbo build
09-18-2013, 01:44 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.
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.
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09-18-2013, 02:01 PM
#42
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.
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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09-18-2013, 02:04 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.
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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09-18-2013, 02:23 PM
#44
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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09-18-2013, 02:39 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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09-18-2013, 02:44 PM
#46
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.
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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09-18-2013, 02:54 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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09-18-2013, 02:59 PM
#49
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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09-18-2013, 03:14 PM
#52
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.
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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09-18-2013, 05:03 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
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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09-18-2013, 05:32 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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