VVT (2004) into 1994 NA
Long time stalker, first time poster. Be easy on me.
I'm currently finishing up my installation of a 2004 VVT motor into my 1994 NA. I've completed all the nuts and bolts and have begun the more challenging aspect of the swap--the electrical system. NOTE: I'm aware that under my current setup I will not be able to control VVT out of the box. I have plans for this in the future. As of now, my main goal is to get the car running. 1.) Ignition Wiring: I'll be integrating the 2004 coil and plugs into my 1994 harness. After much research, I've come to the following conclusions (Please confirm). (1994 Harness) ------------------------> (2004 Ignition) Black (Ground) to Black (Ground) Blue (12v) to Black/White (12v)?? Black/White (Tach Driver) Brown (Trigger) to Black/Yellow (Trigger)?? Wiring Diagrams Used: 1994 Page 8 http://www.madracki.com/miata/images/wiring/94sys.pdf 2004: Page 11 http://www.boostedmiata.com/pdfs/MSM_wiring%20all.pdf 1a.) What is the best method to wire in the Tach Driver, seeing that the 2004 Coils don't require it? I'll be using the stock ECU. Thanks in advance, Flying Goose |
Originally Posted by Flying Goose
(Post 725944)
2.) Wiring the gauge temperature sensor. I know, based on Joe Perez post, that the NA gauge temp sensor is a single wire on the back of the block. However, the VVT motor doesn't have this port.
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1 Attachment(s)
Originally Posted by richyvrlimited
(Post 725947)
It does have the port, look harder, it's filled in with a small grub screw.
Also, I realized that my proposed wiring was a little difficult to follow in the above format so I put together a quick JPEG. |
the little plug is on the opposite side of the head as the na motor was. Just gotta get a good light and look back by the heater hoses.
Good luck with the wiring. I tried this with my vvt set up and couldnt get the 3 wire 01-05 coils to fire. I gave up and am going to go with a toyota cop's |
Any reason why you are wanting to run the 01 coils instead of the 94 coils?
Without an aftermarket ECU I do not think you can get the tach to work. |
Originally Posted by shuiend
(Post 725960)
Any reason why you are wanting to run the 01 coils instead of the 94 coils?
Without an aftermarket ECU I do not think you can get the tach to work.
Sounds like more homework was required on my part ::vash:: |
1. You should be able to make the coil wires fit. I know the coil wires from my friends 99 fit, I just had to trim down the sides of them a little with a razor blade.
2. You can pull each of the 2 actual coils off the bracket they are on and mount them to other places with zip ties for the time being so that you can use them. 3. Well if you are not using the stock ECU it is easy to get a tach signal. All major standalone ECU's can do it. Most people who do the VVT swap are not using the stock 94 ECU. |
Originally Posted by shuiend
(Post 725967)
1. You should be able to make the coil wires fit. I know the coil wires from my friends 99 fit, I just had to trim down the sides of them a little with a razor blade.
2. You can pull each of the 2 actual coils off the bracket they are on and mount them to other places with zip ties for the time being so that you can use them. 3. Well if you are not using the stock ECU it is easy to get a tach signal. All major standalone ECU's can do it. Most people who do the VVT swap are not using the stock 94 ECU. Question, does the original wiring diagram work? Knowing that the tach driver wouldn't be functioning? |
From briefly looking at how you want to do the wiring it should work fine.
In my friends 99 we really did just ziptie his stock coils to things and he has been driving around for a few months now and has had no problems. |
Originally Posted by shuiend
(Post 725974)
From briefly looking at how you want to do the wiring it should work fine.
In my friends 99 we really did just ziptie his stock coils to things and he has been driving around for a few months now and has had no problems. Has anyone ever tapped the CAS signal, created a tach driver, and integrated it with a stock ECU. Not saying I'm going to do this, if possible, but I was curious. Looks like I'm getting the trusty zip ties out |
I am not sure if anyone has built an independent Tach Driver. Seems like more work then just building a MS and using that or using cops.
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Originally Posted by shuiend
(Post 725990)
I am not sure if anyone has built an independent Tach Driver. Seems like more work then just building a MS and using that or using cops.
One question though, at start up she is reading close to 90PSI. I've read that many Miata owners experience this when the oil is cold but wanted to confirm because my only experience is driving one that had 60PSI in each cylinder and a leak down of 25%! So driving one with a healthy motor is new to me :noob: |
Did you put on the oil pressure sender from your old 94 on the new VVT motor? I think I see close to 90psi when I start the car. I will look and see when I leave work today.
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I peg my oil pressure guage at cold and then driving warm it goes to about 60 psi and at idle about 45 psi. So that would seem normal to me.
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Did you ever get the tach working? I am about to do this myself and am wondering about the tach......
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