Hello,
I am building a K swapped 1991 Toyota Mr2 with a K24A2 engine and a 2015 6 speed Civic SI transmission.
I purchased this car specifically for this project to eventually be a daily. When I got the car the stock motor was run down and needed a significant amount of work but it did run. The transmission had some issues and the axle seals were leaking slightly. (Probably the culprit) The largest problem was one of the axle boots had gotten destroyed at some point before I got the car and the CV with no grease had gotten destroyed. I drove the car for about 2 months until the noises from the CV were too much to bear. Pulled the motor replaced brakes and all suspension bushings.
This project was originally supposed to run with a stock Honda ECU and Hondata tuner device. After failing to get the ecu working with all of the stupid Honda immobilizer tech I decided to move over to RUS.
The engine mounts are from Hux Racing. They are not intended to work with this transmission combo, all but one mount fit up perfectly. I was able to attach the last one (rear mount from crossmember) with an additional adapter bracket I made out of some thick aluminum angle stock.
Using KTuned thermostat housing and fill neck in order to adapt to AN and give me a little more freedom with how I route the hose. Since the MR2 has long stainless coolant lines that run from back to front I brazed some stainless AN -16 bungs onto the ends. This made it easy to connect the coolant with short lengths of hose. Although the cost of the AN was a bit painful I think it was worth it for the ease of removal.
Got axles from Driveshaft Shop based on the MR2 SW20 NA Level 2.9 for the Hux Racing mounts. Since my transmission is different from the Hux racing setup I had to get them with custom length. They seem to fit well. Nothing is leaking from my axle seals so far.
Using a stainless exhaust header I found on ebay for only 50 bucks back in the beginning of the build. I figured it was worth a shot even if it was crap for that cheap. It is pretty thin metal as expected but not terrible. The welds are are surprisingly good for the money, only a few leaks that I was able to seal up. May crack in the future but it gets me started until I can make a custom one.
The exhaust on the MR2 5FSE comes out of the front of the engine and the K24 exits on the rear some the spacing is very tight. I wanted to use the stock barrel muffler for the OEM look and hopefully OEM volume. From factory it only used 2" exhaust pipe all the way into the barrel. Decided to try and drill out the muffler and replace the internals with 3 inch stainless pipe so I could run 3" all the way and get a little more flow out of the barrel. The exhaust has been taking the longest because I had no previous experience TIG welding. I bought myself a TIG machine a few months ago and I have been teaching myself to weld stainless in order to do the exhaust. At this point I have nearly finished it just need to finish up the backside of the input pipe and weld the top patch on.
That is pretty much where I am at right now. I have most of the engine wiring harness done as well but I don't have any electronic diagrams to post here yet. As soon as the exhaust is done I will be jumping into finishing the wiring and I will try to post some more updates here as I work through it.
Plenty of stuff done to this car not discussed here yet. Let me know if you have any questions about the build.
Here is how the bay looks right now. Pretty dirty right now, unfortunately the car has had to sit under a cover outside and it has been raining recently.
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