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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 12-28-2013, 04:05 PM   #21
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Originally Posted by Fatvod View Post
Step 1
Ill start out by buying a DIYPNP (still not positive if a MS3 will be worth it in the long run) Get the best ECU you can afford, they're changing constantly, and pretty soon everything currently available will be outdated. A gen2 pnp is a great start though.
Next up, buying rx7 injectors (550cc? Im not planning on going past 220~ hp, so would 460cc suffice?) 460 would definitely suffice, however search around for some RX-8 injectors. Slightly smaller, but a much newer design with a better spray pattern.
Then buying a wideband (not positive how this connects to the pnp ECU?) You plug the signal wire from the WB into the stock narrowband wire, and tell the MS that the narrow band signal is now a wideband signal.
Possibly a TPS? Or should I wait till I turbo. (Also not sure how this connects to the ECU) Same as wideband, you tell the ECU it's now a variable TPS. That or it only thinks its a variable, which is why you unplug the 1.6 TPS and tell the MS there's no TPS. Something like that. You could skip this step, I had a decent tune all with map based settings.
Also not sure if I need COPs for such a low boost. You don't, but it's an easy step, and makes the 1.8 conversion easier and cheaper if you go that route.
Then install these onto the car and learn to tune all this and get a good map going.
See above corrections in red. As others have said, a 1.8 with MS would be a great start, however possibly slightly unnecessary. However I haven't experienced anything past 185hp, so what do I know.
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Old 12-28-2013, 06:14 PM   #22
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What were you making at 12psi?
No clue, my setup has changed enough that it wouldn't be a direct comparison anyway.
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Old 12-28-2013, 11:32 PM   #23
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If there's any chance that you'll change the setup or go 1.8 in the future start with a used turbo and manifold. There's really no point in buying new with as much turnover as there is with FI parts. If you 1.8 swap and find something new in the future that really gives you a boner, go for it at that point, and sell your twice used setup for pretty much what you paid.
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Old 12-31-2013, 10:02 AM   #24
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See above corrections in red. As others have said, a 1.8 with MS would be a great start, however possibly slightly unnecessary. However I haven't experienced anything past 185hp, so what do I know.
Awesome response! Thank you! Props for actually answering some of the questions. I dont think people realize I dont need CRAZY SPEED! I just want a fun project to work on over the summer. On the TPS, are you saying that you got away with not having one?

Last edited by Fatvod; 12-31-2013 at 11:45 AM.
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Old 12-31-2013, 10:35 AM   #25
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If there's any chance that you'll change the setup or go 1.8 in the future start with a used turbo and manifold. There's really no point in buying new with as much turnover as there is with FI parts. If you 1.8 swap and find something new in the future that really gives you a boner, go for it at that point, and sell your twice used setup for pretty much what you paid.
This is a great idea. The only things that are not compatible between the two engines are the mani and the downpipe correct?


Also im thinking of going a different route for sourcing the turbo and mani. Underdogs thread is a huge help and I like the t3 turbo. But im having trouble finding a turbo on ebay I can trust.
How do I tell the good ones apart from the **** ones?
Are the chinachargers that cheap? Id be willing to go up to 300 on the turbo or so.
Does anyone have any seller recommendations?

Also ive heard good things about this mani: http://www.ebay.com/itm/89-93-MAZDA-...item35c17fde82

Things are starting to get cheaper in this build

Last edited by Fatvod; 12-31-2013 at 12:16 PM.
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Old 01-02-2014, 02:10 PM   #26
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Yes, that is a great manifold for a low power 1.6 build.

Unfortunately, there is no 1.8 manifold. Or a downpipe for the 1.6. If you'd like, you can go through all the trouble of fabricating the downpipe, run it for a bit, and if/when you upgrade to a 1.8, you'll have to buy an all new manifold and exhaust. I'd suggest chatting with FM. Ask them if 1.8 downpipe and exhaust will work with a 1.6 manifold. I'm fairly certain that it will.

Then find a used BEGI (fairly certain they're interchangeable) or FM 1.6 manifold, and run it to your hearts desire. You've got a higher quality manifold than the ebay unit, and a much easier upgrade path if/when you go 1.8.
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