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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 08-13-2016, 09:43 PM   #1
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Default How to get started

Yep another noob post :/
Bought my second miata couple months ago (1997, 81k miles) and from then onward i've really been thinking of going FI. Watched car passion channel vids, looked on forums, looked and looked.. and I still can't seem to find someone else who's actually written up about their build for my year. all i've seen is people doing it on 1.6s and saying "oh yeah this is different on 1.8" which really doesn't help me. So what I would like to know is what is different from boosting a 1.6 and a late 1.8? Another thing. Compression tested the cyls today. Numbers were
Cyl 1: 170psi
Cyl 2: 170psi
Cyl 3: 160psi
Cyl 4: 155psi
Good? bad? I read somewhere new BPs put out 180psi brand new.
Once I learn more I plan on picking up a wideband o2. I plan for some moderate really nothing big. It'll still be my daily. T25, 7psi max, intercooled, stock ecu.
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Old 08-14-2016, 04:59 AM   #2
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The biggest issue with your compression test is not having compression of 155 and not 180. It is the fact that the cylinders have a 15psi difference in compression. If you do a wet test on Cyl 4 it will show solid. It's the rings.

Your options are to
A) Boost this engine. I may last, it may not. You may spend a ton of money just to destroy an already weak engine.
B) Find a low mileage (compression AND leakdown tested engine) BP. Think reputable JDM engine importers.
C) Build your engine. Obviously, most expensive (although option A may be the most expensive in the long run. Blow the engine, have to use B or C anyways.).

I think you ought to do the reading on the 1.6 and 1.8 yourself. There's plenty of material on the forum. Limiting factor of torque is the rods, and they share the same rods.

If you are on a steep budget, and classifieds for intercooler/engine management.

There's a Megasquirt 3 in the classifieds now. May be a good time to jump on it if you are serious about your project.
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Old 11-30-2016, 07:14 PM   #3
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update since first post I realized how big of a tard I sound in my first post.. trying to redeem myself haha:
Put a MS2pnp in and tuned it using auto tune and adjustments I felt were needed. Most likely still getting it tuned by a pro later.. runs better than stock as it is, was extremely surprised.
Put in the FM clutch, just broke it in. They weren't lying about stock feel! Also changed rear main seal and both slave and clutch master cylinders while i was there.
Put in an Innovate MTX-L wideband, self explanatory
Autometer boost gauge, looks good with the big face, but putting it in with DIY face plate requires shaving some of your tombstone.
mounted intercooler.
Did the timing belt kit with all seals and water pump too.
ordered the begi shanghai kit waiting on that to come in. ill probably run it as it is on 5psi, get bored, finish intercooler piping, get rx8 injectors and go for nice numbers. then toss the churbo and get a 2860.

Oh yeah and i really feel bad for that first post, after 20 minutes of reading I got all the lines and routing down. All everyone would talk about was the feed on the block, never saw anyone doing the pressure sender but it seems simple once i visualized it. and not too worried about compression test, I think i forgot to WOT on the 4th because I redid it and got 160 for the 4th. whatever, would've been cleaner to get 180 on all 4 but I really want to see how far she goes.

Last edited by barshroom; 11-30-2016 at 07:21 PM. Reason: remembered something haha
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