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Old 10-21-2014, 05:39 PM   #1
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Question Mazda 323 GTX 1.6 Turbo setup on a '90 1.6 Miata

Hi guys,

i'm new to THIS particular forum, but I know the common rules about the forums. I did search a lot, but I didn't find anything specific that would calm down my needs of knowledge.

So the thing is, I have a spare 323 GTX 1.6 block (pre '89, which means it has thick rods), copper head gasket (actually two of them, to be precise). My friend has the GTX ECU. I was wondering a lot about making a bit more power out of my Miata and thought about two options - supercharger or turbocharger.

So the main question is, is Miata compatible with the GTX ECU? I mean, is it possible to plug that GTX ECU to my Miata, put the magical turbo stuff into it and go choo-choo?

Since this is a budget project, and i live a few thousand kilometres away from the West (Lithuania here), I would like to avoid getting VEMS or MS, cuz they are pretty expensive here (considering our salaries).

So is it possible? If the ECU fits, won't there be problems with differences between distributors (not sure if this is the word for the part, that sends electrical impulses to spark plugs)? Because Miata has an electrical one, ant the B6T has a mechanical one?

Sorry, English is definetely not my native language, so please, ignore my mistakes
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Old 10-21-2014, 06:31 PM   #2
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I can't say for sure, but I'd say you have a pretty good shot at making this work. The Miata engine is based on the GTX, probably runs the same sensors (including the cam angle sensor), and at the very least you could just run the GTX harness into the engine bay if there are some huge differences.

Does the GTX ecu use the same harness connectors as the Miata? If so, find ecu pinouts for both and compare. It might be a matter of moving a couple pins around or adding a new lead or two (the knock sensor comes to mind for one).
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Old 10-21-2014, 06:35 PM   #3
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From a quick google search it looks like the distributor goes in same place as the CAS. Because of that, the B6T distributor will not fit the miata engine bay.
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Old 10-21-2014, 06:40 PM   #4
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Distributor vs CAS+wastespark would make the wiring and ECU different.
Modding the firewall can be a budget option.
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Old 10-21-2014, 06:43 PM   #5
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Holy crap those cars had a distributor? Guess I shoulda looked. Maybe the cas will bolt in and make his life complete.
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Old 10-21-2014, 06:45 PM   #6
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this is a 323gtx engine bay



The other question is about the MAF? Are they different?
Maybe the GTX ECU would work toghether with the CAS?
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Mazda 323 GTX 1.6 Turbo setup on a '90 1.6 Miata-mazda-323-gtx-engine-hd-mazda-familia-gt-elegant-color-photos-photos.jpg  
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Old 10-21-2014, 06:46 PM   #7
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^but you can use the Miata Cam Angle Sensor. But you will find that the Miata ECU directs the sparks instead of a distributor so the GTX ECU will have no device to do that. I hate telling someone to use a rising rate fuel pressure regulator and a Bipes to retard the spark, but those are a cheap option.

Please, has anyone got a cheap MS1 to sell to this man?
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Old 10-21-2014, 06:47 PM   #8
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Quote:
Originally Posted by matthewdesigns View Post
Holy crap those cars had a distributor? Guess I shoulda looked. Maybe the cas will bolt in and make his life complete.
I think the chance of it bolting in is close to 100%.
Then he would have to make sure that the CAS trigger output is the same as the distributor.
Finally, run both coils off the wire that triggered the distributor coil before

Tach would read twice as high but meh, details
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Old 10-21-2014, 06:48 PM   #9
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Or you could cut the firewall for the distributor.


Why didn't Mazda put the GTX battery in the trunk?
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Old 10-21-2014, 06:49 PM   #10
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Quote:
Originally Posted by sixshooter View Post
^but you can use the Miata Cam Angle Sensor. But you will find that the Miata ECU directs the sparks instead of a distributor so the GTX ECU will have no device to do that. I hate telling someone to use a rising rate fuel pressure regulator and a Bipes to retard the spark, but those are a cheap option.

Please, has anyone got a cheap MS1 to sell to this man?
If its anything like the distributor on Nissans, then it also outputs cam/crank signal to the ECU, which in turn controls ignition. THE ONLY difference is that with a distributor, there is only one coil, and so only one ignition output (miata has two).
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Old 10-21-2014, 07:15 PM   #11
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So I guess, that without cutting my firewall and getting a GTX distributor (which is more rare than Lindsay Lohan being sober) i should get MS1. But, what about Piggyback ECU? I heard, that you can't get rid of MAF with a piggy (which is a bitch, because with these old MAF's of Mazda it's really hard to catch all the bug's in your fuel map)?
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Old 10-21-2014, 07:43 PM   #12
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the turbo kit from the B6t also wont fit. exhaust would point towards the front of the car.
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Old 10-21-2014, 07:46 PM   #13
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Nevermind the exhaust. That's easily customised and cheap. The main headache for me is the ECU. I need the cheapest solution for the engine management, the other stuff is just small stuff
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Old 10-21-2014, 07:49 PM   #14
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by the way, i did almost the same stuff with a B6 engine (16V sohc) in an Mazda MX-3. Parts i took from the GTX for that:
ECU
Injectors
Turbo
Harness
Distributor
MAF

All other stuff was fabricated. The big question is that Miata and GTX engines are the same and what is their ECU compatibility when going turbo
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Old 10-21-2014, 09:18 PM   #15
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If it helps I have 2 B6T distributors and can spare one if that's what you need. I also have a stock B6T ecu and a "chipped" ecu with stock EPROM as spare still. Plus anything else you can imagine from these cars.
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Old 10-22-2014, 08:00 AM   #16
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There sure are a lot of nice people on this forum. I'm happy people are willing to help each other.

Piggybacks generally don't work very well and are limited in power production. Finding a good, cheap, used MS1 would be ideal. I'm using an MS1 and it works very well for me. A newer ECU would have more features but everything I really need to run is in the MS1.
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Old 10-24-2014, 06:18 PM   #17
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The gtx ecu won't work with a miata harness the connectors are different. Also the turbo stuff won't fit. The motor mount is right where the turbo is.
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Old 11-08-2014, 06:27 PM   #18
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Best bet is to do this:

GTX block, pistons rods etc.
Miata Head
MS1 ECU
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Old 10-31-2017, 10:23 PM   #19
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Hey I have ah gtx bt6 I would like ah good turbo to put on any ideas?
The engine is been put in ah Mazda Familia 4wd car I jus looking for ah decent turbo that would give me good hp
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Old 10-31-2017, 11:00 PM   #20
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Quote:
Originally Posted by Star Boy Watson View Post
Hey I have ah gtx bt6 I would like ah good turbo to put on any ideas?
The engine is been put in ah Mazda Familia 4wd car I jus looking for ah decent turbo that would give me good hp
Watson, come here. I need you.
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