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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 07-22-2010, 12:04 AM   #1
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Default Do I need engine management?

I traded my Honda for a 94 m edition, with what might be a blown turbo. All I know is that it was run previously at 5 psi with no intercooler. There is smoke pouring from the intake filter, the wastegate is not connected to the turbo currently. Actually the wastegate is busted. There are no upgrades on the car, stock internals and injectors. It came with more piping and a new eBay front mount. If I just bolt on another turbo and running at low boost, no more than 5psi would it be ok to daily drive? Do I have to have engine management at this level? I only have a few hundred bucks to fix it. If nothing else I can put the stock manifold on and run it NA. Since the the oil lines are already run and everything hooked up, I figured it's probably easier just to fix the turbo, but I'm really short on cash. Besides that, I need new spark plug wires, driver side top latch, there are holes in my trunk from a giant wing, and my tan interior was sprayed black by a previous owner. Also missing the m edition wheels.
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Old 07-22-2010, 12:25 AM   #2
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You need injectors. You need engine management. Of course, those two things are expecting that you want to drive the car at WOT and make actual power. You can drive the car, albeit out of boost, with no engine management and stock injectors.

Frankly, I'd just swap the N/A manifold on and spend my time fixing everything else before replacing the turbo and buying megasquirt/injectors.
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Old 07-22-2010, 12:28 AM   #3
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stock injectors are good for about 7-8 psi i believe. you dont have to go all out with a standalone ecu for your psi goals. but it would be a good idea to invest in something that will help supply more fuel for the added air into the chambers.

Edit: a wideband as well!
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Old 07-22-2010, 12:32 AM   #4
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I couldn't get the stock injectors to supply enough fuel beyond 3-4 psi, it's possible the NA injectors supply more fuel than the NB injectors but I'd still highly recommend upgrading them in either case.
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Old 07-22-2010, 12:35 AM   #5
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NB injectors are slightly larger than NA injectors, my 96 was running fine at 7-8psi with NA tan tops.....


i was running rich as **** to....
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Old 07-22-2010, 12:40 AM   #6
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99-00 Mazda Miata 240cc - Thin Red Body #195500-4430
94-97 Mazda Miata 265cc - Tan Top

^ from the FAQ.

Maybe I'm high, but I was having issues with fuel shortage. You running a larger pump?
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Old 07-22-2010, 12:44 AM   #7
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yeah, walboro 190hp....

in any case OP if you want to go the lager injector route there are many plug and play injectors out there.....ranging from 305 cc on up to 750 cc (< based on used injectors from other cars) but you need a way to able to supply the injectors with more fuel.
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Old 07-22-2010, 12:51 AM   #8
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Since it's the 1.8 my injectors are good for almost 9psi? I really don't want much hp right now. This is my first turbo car. I would rather not have to run it NA, at bare minimum what do I need to do to run it at 5psi? You are probably right I should pull the turbo off and source better parts, maybe try to save money and trade some stuff I already have for more parts. This car is going to be my daily driver for a while.
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Old 07-22-2010, 12:51 AM   #9
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Take the turbo off, good god, take the turbo off.

WonTon, your avatar may have scared him off.
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Old 07-22-2010, 12:53 AM   #10
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Quote:
Originally Posted by curly View Post
Take the turbo off, good god, take the turbo off.

WonTon, your avatar may have scared him off.

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Old 07-22-2010, 12:54 AM   #11
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9 psi is if and only if you you have a fuel pressure riser, something like vortech's unit or BEGI's adjustable unit. As the air goes up with RPM (because of boost), your fuel needs to go up as well. These two things, or an aftermarket ECU with MAP sensor, do that.

If it's a daily driver, and you have very little money, TAKE THE TURBO OFF!

Other things will break, you already mentioned non-turbo items that need attention, and you have, as far as I can tell, a very half assed turbo setup that WILL grenade your engine soon.

Do you have any pictures of the engine bay you can post to help us identify any other problems you may have?

Last edited by curly; 07-22-2010 at 01:13 AM.
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Old 07-22-2010, 01:00 AM   #12
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^^^ what curly said!

picture will help as well...
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Old 07-22-2010, 01:14 AM   #13
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Yeah that's what I figured, from what I was told the turbo was bad from the start, it's been run for a few months like that, it's not hooked up now and runs well. I traded a 96 civic coupe with a few bolt ons. It has half the miles my civic had and with it being an m edition I figured it was worth the trade. On Friday I'll convert to NA and replace the valve cover gasket, its leaking a little. Any ideas on plugging up the oil line?, it's tapped on the pan, I guess I can just put a bolt in there.
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Old 07-22-2010, 01:16 AM   #14
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I'm on my iPhone at work, I have a pic on it. I will work on posting one.
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Old 07-22-2010, 01:37 AM   #15
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Should be an NPT thread in the pan, go to home depot, they'll have a section for brass plumbing hardware, where you'll be able to find the correct NPT plug for it.

Just to clarify: NPT stands for National Pipe Thread, and it's a tapered thread, so a standard bolt won't seal it correctly, only another NPT plug.

For the feed, the hole in the block the oil is coming from is plugged with a bolt and brass washer, much like a small oil drain bolt. I'm sure someone here will send you one for the price of postage, if you can't figure out a similar fix.
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Old 07-22-2010, 01:38 AM   #16
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iPhone picture posting sucks, I managed to do it using photobucket once. It took about a half hour. I'm sure they have an app for it though, look for one first.
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Old 07-22-2010, 01:53 AM   #17
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ok cool thanks, I'll create a flickr account when I get up. I work night shift, it kind of sucks.
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Old 07-22-2010, 02:09 AM   #18
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Quote:
Originally Posted by snellm3 View Post
I work night shift, it kind of sucks.
Me too. And yes it does.

Edit: Click on "user CP" on the upper left corner of this page. Enter in your location, so others around you might help you if/when you need it.
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Old 07-22-2010, 05:07 PM   #19
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When I got home the miata caught on fire, when I pulled up I saw paint started to peel up from my hood. I was like wtf, popped the hood, and flames where shooting up by the turbo. I put it out with a hose, turns out I think the oil line busted on top of the turbo or exaust manifold and started it. Now my hood is screwed, but everything looks ok under the hood.
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Old 07-23-2010, 04:03 PM   #20
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Damn sorry to hear about the fire. Best time to go ahead and find a stock exhaust manifold and get everything else sorted out first.
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