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Old 08-02-2011, 11:12 PM   #1  
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Default diypnp fuel management question (noob)

i have a 90 miata 1.6 and recently came across a 1.8 with extremely low miles

i do intend on turboing that motor before it goes in
i was first thinking about doing a voodoo 2 and then upgrading further along the way. but after comparing that to begi s1 im thinking i would rather go with that. and of course i could use the voodoo box with it. but since i may like to later on go with a complete ecu replacement and the diypnp is roughly the same cost im thinking it might be a better choice to go ahead and get that now. am i wrong? and i have read on miataturbo.net that its a good idea to get the ecu and learn how to tune before you get the turbo.

i have read how the voodoo box works by extending the signal to the stock injectors therefore maxing out their potential to support 8 psi

so my question is will the ms diypnp also be able to make the stock injectors support 8 psi? or will i need bigger injectors?

i know the question may sound dumb but i would really like to know for sure before i dump $400 into it

thanks
jared
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Old 08-02-2011, 11:40 PM   #2  
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Yes. Go ahead and get the MegaSquirt. I did my MS and turbo at the same time. I regretted it, slightly. Since I have been working with MS since around '05-'06 I was already familiar with it. The only thing I regretted was that I was tuning my own car and not one a friend's car, lol I had no problem going ballz deep with some of the E30's I used to help tune. They are tanks compared to the miata and that is saying a lot.

With the new software available road tuning is made easy. Even after using MegaTune forever I still made the switch to Tuner Studio. It's nice, but I miss the old skool stuff every once in a while. In fact, I still have a friend that tunes with MegaTune on MS1 using a EGT and nothing else No issues yet, even after running 6's in the 1/8th @ 100+mph

Anyway, yes. Stock injectors are good to around 6-8psi depending on the model of injector. I know some 1.8's had different sizes, I'm not sure what they are though. When I first got my car running I had issues with one of my RC's and ended up using my stock 1.6 injectors @ 6-7psi. I had no issues.

Good luck.
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Old 08-02-2011, 11:43 PM   #3  
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Ok I'm am not a all knowing turbo person so you'll need to talk to someone who knows way more then me but with that being said my question to you is, when your going turbo do you REALY wana "MAX OUT" anything. When your going turbo you don't wana go cheapo because that's how people blow there engine. Now for what you wana do someone who knows way more might come an say you'll be fine. All I'm saying is, my advice is when your going turbo cheap is not allways the best way to go.
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Old 08-03-2011, 12:02 AM   #4  
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Originally Posted by Sid1 View Post
Ok I'm am not a all knowing turbo person so you'll need to talk to someone who knows way more then me but with that being said my question to you is, when your going turbo do you REALY wana "MAX OUT" anything. When your going turbo you don't wana go cheapo because that's how people blow there engine. Now for what you wana do someone who knows way more might come an say you'll be fine. All I'm saying is, my advice is when your going turbo cheap is not allways the best way to go.
i understand your concern and feel the same way
heck im lookin at a begi kit with a garret turbo. im just wanting to upgrade along the way and wondering if the megasquirt would have been able to do the same with the injectors as the proven voodoo. which it seems it can

thanks for the info
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Old 08-03-2011, 12:09 AM   #5  
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I would go with some version of the Megasquirt, without a doubt. More flexibility and room to expand if you want. More controllable too. Plus way more features. There's a few guys that will build them for you here if you don't feel comfortable doing it too.

The stock tan tops should do 8 PSI but they'll be close to or at their limit. You could always upgrade to a larger injector later with the Megasquirt.

Here's the DIY turbo FAQ at MT.net. It has some good info in it.

http://www.miataturbo.net/showthread.php?t=4288

Last edited by Riggy; 08-03-2011 at 12:13 AM.
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Old 08-03-2011, 12:19 AM   #6  
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There's a few guys that will build them for you here if you don't feel comfortable doing it too.
so long as there are some clear, easy to understand instructions than i will feel comfortable assembling it myself. and as for the soldering, if i feel i cant do it (which i hear is pretty easy) my mom used to solder circuit boards for crown amplifiers for a few years. ill just get her to do it. just so long as the instructions are clear as to where everything goes.

thanks
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Old 08-03-2011, 12:36 AM   #7  
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If you get a kit from DIYAutotune it is. Everything organized and well packaged. All the packages are marked with component part numbers and corresponding part locations on the board. They even tell you what the lead spacing to use with the lead bending tool so it fits in the board. It's a very well thought out kit.

Here's the Important Megasquirt threads at MiataTurbo.net:
The first one is how to build your own.

http://www.miataturbo.net/showthread.php?t=17498

And the MiatatuboWiki:

http://miataturbo.wikidot.com/

Those should answer any questions you may have.
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Old 08-03-2011, 01:17 AM   #8  
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Sorry I just realized you were referring to a DIYPNP. I'm not really familiar with the DIYPNP. I started with a MS1 and upgraded to a MS2. Someone will have to chime in on how difficult the DIYPNP build is.

My build was my first electronics project and it was a little tricky but it got a little easier with time. I'm no wizard at it but I have a pretty good grasp on it. It's in my daily driver and has never left me stranded so I guess I got it right.

MiataTurbo.net was a big help. I probably wouldn't have been able to get it together without them guys.

Here's the documentation on it to give you a heads up on what you might be in for.

http://www.diyautotune.com/diypnp/docs.html
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Old 08-03-2011, 06:23 AM   #9  
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Quote:
Originally Posted by jared8783 View Post
and of course i could use the voodoo box with it. but since i may like to later on go with a complete ecu replacement and the diypnp is roughly the same cost im thinking it might be a better choice to go ahead and get that now. am i wrong?
nope. not wrong, get it now, dont get the voodoo box.
Quote:
and i have read on miataturbo.net that its a good idea to get the ecu and learn how to tune before you get the turbo.
great idea.

Quote:
so my question is will the ms diypnp also be able to make the stock injectors support 8 psi? or will i need bigger injectors?
yes, but it can also control larger injectors, which can support all the fuel you'll need.

Quote:
i know the question may sound dumb but i would really like to know for sure before i dump $400 into it
if it were me, I'd do the diypnp over the voodoo box hands down.
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Old 08-03-2011, 03:39 PM   #10  
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+1 on larger injectors for boosted apps. Too much fuel isn't good but not enough = BANG! Any of the MegaSquirts will be able to handle just about any injector you can install to it's fullest.

Another +1 on the DIYAutoTune suggestion. Great folks that will bend over backwards to help you.
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