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Old 12-24-2006, 07:07 PM   #1
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Default 99' motor to 92 NA chassis

I'm sorry if i'm reposting any similar topic. I've done a search and found nothing. Anyways, I got a '99 motor laying around collecting dust and I got a 92 miata that's stuck in reverse with a blown motor. I also got a greddy e-manage ultimate laying around. I do plan to go turbo sometime this year. I just don't currently have a budget. I waited 3 months for flying miata's 1.8-1.6 swap, i finally gave up waiting and started seeking other alternatives.

Anyways, I kno that most of the time when people do this swap they put the 1.6 coil packs on to the 1.8. and I would probably need a alternator from an earlier 1.8 because the '99 doesn't have a voltage regulator. As for the variable TPS it's just 4 wires right? The top two wires are for the variable signal (pentiometer) and the bottom 2 is just the on-off? Therefore, could i just leave the top 2 wires disconnected? Maybe I could send the variable signal to the EMU? If I do choose to install the EMU now, I was also looking into the boomslang harness. It seems convienant and less time consuming but I don't know which options to choose. I will also be removing the VICs. Any help, advice, and feedback will be appreciated. PLEASE HELP ME!! LOL!!
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Old 12-24-2006, 07:23 PM   #2
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why get rid of the vics. IIRC it has nothing to do with the ecu, the VVT on 01+ did.
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Old 12-24-2006, 08:24 PM   #3
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after doing some reading, i've decided i'm going to keep the VICS
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Old 12-25-2006, 01:58 AM   #4
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I did the same swap on my car. I had to extend the wiring for the CAS so it would reach to the driver's side of the engine, I used the FM throttle cable adapter thingy and I re-used the oil pressure sensor from off the 1.6 (I also needed to remove the 99's knock sensor as the oil pressure sensor is pretty big.)

That was about it. The only real hassle was with the throttle body. I couldn't get the FM throttle body adapter so I ended up using the 99 throttle body which is great for the throttle position sensor, but it kinda sucks for the IAC valve as the 1.6 and 1.8 valves run on different settings. The 1.6 ECU will fry a 1.8 IAC. I learned that the hard way....

I solved the IAC problem once my Megasquirt was modded to be able to control the idle. I'm not sure if your E-Manage will do the same.
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Old 12-25-2006, 02:38 AM   #5
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so can you use the 1.6 t-body with megasquirt? What is the IAC and vics?
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Old 12-25-2006, 07:14 AM   #6
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Quote:
Originally Posted by hustler View Post
so can you use the 1.6 t-body with megasquirt? What is the IAC and vics?
The Megasquirt will handle both the 1.6 and the 1.6 throttle bodys. It just needs a different frequency setting for each one.

The IAC is the Idle Air Control valve and it performs the same function as the ISC (Idle Speed Control) valve.

VICS is an electronically controlled variable-length intake system. At low rpm the intake path is directed down a longer intake tube for an improved ram effect, but at higher rpm the intake path is directed down a shorter intake tube to get the air to the cylinders faster. The VICS is controlled by the ECU and it is very easily controlled on an aftermarket ECU by wiring it to a 'shift light' output on the ECU.
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Old 12-25-2006, 01:10 PM   #7
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Quote:
Originally Posted by Aussie Driver View Post
The Megasquirt will handle both the 1.6 and the 1.6 throttle bodys. It just needs a different frequency setting for each one.

The IAC is the Idle Air Control valve and it performs the same function as the ISC (Idle Speed Control) valve.

VICS is an electronically controlled variable-length intake system. At low rpm the intake path is directed down a longer intake tube for an improved ram effect, but at higher rpm the intake path is directed down a shorter intake tube to get the air to the cylinders faster. The VICS is controlled by the ECU and it is very easily controlled on an aftermarket ECU by wiring it to a 'shift light' output on the ECU.
Thanks. I bet I can find the TPS frequency setting one here right?
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Old 12-25-2006, 07:12 PM   #8
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The TPS is just a linear response 0-5V signal. Pretty much any ECU will cope with that.
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