04-24-2014, 12:54 PM
Join Date: Nov 2009
Location: Harpers Ferry WV
Total Cats: 20
Ok now on the computer I can write a relevant post.
Things needed to be done to get a 2jz in a miata. I am using a 2jzge with single turbo manifold and w58 transmission.
Make engine mounts. Mine is solid mounted with some brackets made at home works great would do it again.
Trans cross member custom mine is square tube with some angle iron with the toyota trans mount bolted thru it. Then it is bolted thru the miata frame rails. I need to cut out a section of frame rail and weld in some 2x2 tube or similar I do not currently have this but will.
Rear. I am using a TurboII RX7 rear with custom rear cross member to hold the snout in place. there are about 10 different ways to do it just pick one you are comfortable with.
Fuel system. I have a walbro 255 intank and bosch 044 inlive -6an aluminum feed with stock feed as return.
Brakes Miata sport breaks all the way around work great.
Wiring and power goals are the killers of the whole project. Make sure you know what you want when you start makes things a whole lot easier to begin with.
I have a custom wiring harness I did myself prob took me about 100 hours to get it right. I have redone numerous things because my initial goal was 400 whp. After driving the car this is not enough so the new goal is 600-650. I would have done a few things different had I known this from day one.
Mounting the engine and transmission is one of the easiest parts. Wiring will by far take the most time out of all of it. Pick a fuel management system that will fit your needs. I was going to use megasquirt but since the support for the 2j is not there yet. I ended up buying a used AEM V1 witch is what I will be tuning with very soon. If you are confident enough to get the engine and trans in the car and wire it you will have no problems. I was a little scared of wiring when I started my project now wiring does not worry me at all. You can go the easy route and call Dr. Tweak and have him make you up a harness or you can do it yourself both work.
Once the engine is in the car and running you will run into a million small issue that may or maynot drive you crazy. For example. Temp gauge on the dash I had to mount a miata coolant temp sensor in the water neck and run a wire directly to the dash. The tach would not work with the 2j ignitor so I mounted an autometer tach into the stock location and wired that in. Oil preasure I use an after market gauge. The speedo will work with the toyota transmissioin W58,W55, or R154, using a MKIII R154 speedo drive unit. In my case the speedo works out to be within 4 mph. Other small things may drive you insane like a broken wire or bad ground. Make sure you ground the hell out of the 1j they dont like not having a billion grounds. If you can deal with all that then its 100% worth it. Let me know if I can give anymore incite.