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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 09-11-2006, 11:34 AM   #21
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Originally Posted by samnavy View Post
I've got 136k miles on mine. I did some research and based on projected longevity with those miles and "currently" having good compression, I expect to get around 40k-50k miles at 8-9psi. A used low mile short block is only $500. But I'll go Link in a couple years when the engine finally goes. I'd say that if you've got the extra cash, access to a cheap longblock, and the time/resources to make the change, then flip a coin. Heads:make change... tails:make change in a couple years.

It looks like you've got the rest of the bases covered. Did you see the spreadsheet I linked in my DIY thread. I've updated it as I've gone along and so far I'm right at $1700. That's just for the turbo stuff and doesn't include the clutch. I'll also need to budget in an extra $200 or so for tuning. IT ALL ADDS UP! Little things like zip-ties and various tubes of goo are the things I didn't expect.
Thats a good point, its always little stuff everytime you start a project...like the extra 6 bucks for brake fluid b/c someone decided to spill it...or when you have to go invest in the entire stock of PB blaster b/c nothing wants to come off lol.

~2000 is what I'm hoping to spend on the initial setup, figure if she blows sometime after I'll have a chance to rebuild/upgrade some parts.
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Old 09-11-2006, 11:44 AM   #22
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Originally Posted by braineack View Post
BEGi, JGStools, ETD Racing, to name a few.

For the price Fallin Blade is letting his brand new BEGi manifold and DP for, I wouldn't pass it up. You can't beat something built by Corky Bell himself.
that is a freaking amazing price...I just don't have the 600 bucks in the bank right this second to pay for it. they look so good, just for the 200+ dollars saved I would run a t3.
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Old 09-11-2006, 11:46 AM   #23
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Originally Posted by m2cupcar View Post
A compression check is a quick way to see what kind of shape the engine is in. You're just looking for minimal disparity between cylinders with a respectable compression reading. I think minimum spec in the book for a 1.6 is 145 or os... and if you're that low, boost will surely push oil past the rings. Not saying it won't run and be quick though. - rob
I do need to do a compressor check just to see if she'll be ok...I don't have any tools of the such at home...how much would any shop charge to do a test? Just a ball park figure?
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Old 09-11-2006, 12:02 PM   #24
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You can buy a guage to do it for under $20 at any autoparts store. Even Walmart sells one.

Basically you undo all your plugs and screw in the guage to each cylinder (at a time) and try to start the engine. This pressurizes the gauge and you've read your compression.
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Old 09-11-2006, 12:06 PM   #25
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Don't forget to hold the throttle wide open while cranking, and unplug the electrical connection for the injector harness- we don't want to be filling the cylinders up with gasoline while we're doing this.
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Old 09-11-2006, 12:09 PM   #26
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why not take all the fun out of it.
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Old 09-11-2006, 04:20 PM   #27
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lmao...thanks guys. I'll do a search on here a miata.net to make sure I'm doing it right, before I do it...

so I'm looking for consistancy and #s above 145?

wheres that clip for the injectors btw? I'm being real lazy today...sorry x.X
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Old 09-11-2006, 04:20 PM   #28
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Originally Posted by miatamania View Post
I do need to do a compressor check just to see if she'll be ok...I don't have any tools of the such at home...how much would any shop charge to do a test? Just a ball park figure?
The shop would probably charge more than buying the tester. I bought a "good one" for 25 bucks. Have your buddy give you a hand, shouldn't take too long.
Here's some directions, albeit for another vehicle. Note the wet test:

http://www.dsmgrrrl.com/FAQs/compression.htm

As noted earlier, it's the difference between the numbers rather than the actual numbers you should concern yourself with.
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Old 09-11-2006, 04:22 PM   #29
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As noted earlier, it's the difference between the numbers rather than the actual numbers you should concern yourself with.
Alright, I'll keep that in mind...is their a specific order they need to be done in? or does it not matter as long as I get the numbers?
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Old 09-11-2006, 04:24 PM   #30
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Originally Posted by miatamania View Post
lmao...thanks guys. I'll do a search on here a miata.net to make sure I'm doing it right, before I do it...
so I'm looking for consistancy and #s above 145?
https://www.miataturbo.net/forums/sh...ht=compression
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Old 09-11-2006, 04:25 PM   #31
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Originally Posted by miatamania View Post
Alright, I'll keep that in mind...is their a specific order they need to be done in? or does it not matter as long as I get the numbers?
Order does not matter. Really, it's just removing the spark plug, disconnecting relevant connections, having your help floor your car (WOT) then crank for ~5 secs while you note the number on the gauge. There may be specifics, however I've yet to perform the test on my miata, so the generals are all I can provide. (Hey, write a how-to, heh).
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Old 09-11-2006, 04:40 PM   #32
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Originally Posted by miatamania View Post
wheres that clip for the injectors btw? I'm being real lazy today...sorry x.X
Behind and below the fuel rail, secured to the engine with a plastic mount. It's a black, square-ish connector, containing 5 or 6 wires.
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Old 09-11-2006, 08:52 PM   #33
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se hodite!!!
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Old 09-11-2006, 09:01 PM   #34
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how much would a rebuild go for a 1.8 motor
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Old 09-12-2006, 12:33 AM   #35
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Originally Posted by UofACATS View Post
Order does not matter. Really, it's just removing the spark plug, disconnecting relevant connections, having your help floor your car (WOT) then crank for ~5 secs while you note the number on the gauge. There may be specifics, however I've yet to perform the test on my miata, so the generals are all I can provide. (Hey, write a how-to, heh).
I'll do it this weekend and post up...pics might take a bit though.
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Old 09-12-2006, 02:24 PM   #36
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but yea anyways, Look into a emanage, A good bang for the buck and they make a direct plug and play harness for the miata?
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Old 09-12-2006, 03:13 PM   #37
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Originally Posted by RicanmiataRacer View Post
how much would a rebuild go for a 1.8 motor
Doing it yourself w/ factory parts? maybe around 3-400? or so...having someone else do it...no idea.
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Old 09-12-2006, 03:14 PM   #38
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Originally Posted by RicanmiataRacer View Post
but yea anyways, Look into a emanage, A good bang for the buck and they make a direct plug and play harness for the miata?
I'll look into it, from what I've seen EM is the biggest PITA about turbo'ing a miata...why did mazda make the ECU so dumb? lol
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Old 09-12-2006, 03:30 PM   #39
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WHY Did mazda wait until 2005 to make a turbo miata...?'s like this will ansewerd with stupidity!
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Old 09-12-2006, 03:33 PM   #40
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Originally Posted by miatamania View Post
I'll look into it, from what I've seen EM is the biggest PITA about turbo'ing a miata...why did mazda make the ECU so dumb? lol
the emanage is a really good unit for the money from the countless people that have told me this...I got one just the other day brand new with hanesses and such from a good buddy of mine as a b-day present , I could'nt be happier than a kid in a candy store
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