|Author: Andrew Zook February, 2000||
Supra Engine Swap
Part I Index:
Starting out, I really didn't know as much about the swap as I had wished I did. I still have a lot of unanswered questions that I will have to work out as I get to them.
The MKII Supra is based on the Toyota Celica. Because the Celica from this time had the 22RE in it, the mounting configuration of the 5M-GE is very similar to that of the 22R series engine (which was in my truck).
I have been told that no body lift is needed to fit this engine into the Toyota pickup, and I am inclined to agree with this after measuring the two engines side-by-side. The 5M is only about 1" taller than the 22R (with the air cleaner installed).
|5M-GE motor mount|
Although the motor mounts are located at the same place on the 5M as the 22R, the bolt holes do not line up. I need to do a little fabricating on the motor mounts to be able to bolt the engine in, but the amount of work is minimal compared to what is needed for other engine swaps.
The 5M bellhousing bolts to the truck transmission without any adapters. The rear of the engine itself is in the same position with relation to the engine mounts in the truck. This means that no driveshaft modification or relocation of the crossmember is necessary when installing the 5M.
The clutch that is used is the one from the Supra. I was lucky that the car I purchased for the swap has a Centerforce clutch in it. This should be able to handle the abuse that off roading and the 5M put on it. Time will tell if the transmission is able to withstand the increase in HP and torque. My transmission currently has somewhere around 200,000 miles on it with no problems.
|The cooling fans|
Because the new engine is so long, the original mechanical cooling fan will not fit. The solution is to run dual 10" electric fans in front of the radiator. According Spencer, there should be no problems with overheating associated with this setup.
I don't know at this time what radiator I will be using. I would prefer to use the one from the Supra because it is much larger and the ports line up with the engine. Spencer used a stock radiator from a V6 which is a direct bolt-in but has the ports on the opposite sides of the 5M engine.
One of the major issues with this swap is the exhaust. The exhaust on the 5M exits on the passenger side of the truck - opposite to where it exits on the 22R. I have not decided what I will do about this yet, but I have formulated a bit of a plan. I believe that I can squeeze it past the transfer case and exit it to the side - behind the cab where the fuel tank used to reside.
The fuel pump on the Supra is external to the tank. This makes it easy to retain your original fuel tank in the event that your truck is carburated.
I have been considering installing the Supra fuel tank in the rear of the truck where the spare tire was originally located. This will gain me some ground clearance from the stock tank that hangs relatively low and will also help to redistribute some weight to the rear of the truck where I desperately need it. From my measurements I have determined that the Supra tank will fit nicely in the rear, but would definitely require that I relocate my shock mounts - which I have wanted to do anyhow.
|The front sump oil pan|
I have also heard that this swap will only work in trucks with a solid front axle (as opposed to IFS) because of clearance issues with the oil pan. While this may be true with the front-sump pan that is originally on the 5M, I believe that swapping the original oil pan for one from a 7M-GE (MKIII Supra engine) could solve this issue. The 7M has the sump located in the rear of the engine which may, or may not provide enough clearance for the IFS components. The sump on the oil pan also looks like it will interfere with crossover steering setups. I have been researching the possibilities of a different oil pan for this reason.
I am not running AC in my truck at this time, but according to Spencer Edwards, the original AC pump will not work. He relocated his stock compressor to where the power steering pump on his 5M originally resided, and he also used the power steering pump from his 22R to handle the power steering. Because I do not have AC on my truck, I will retain the original 5M power steering pump and mate it to my original steering gearbox.
|The extra wires - removed|
|The engine in the Supra|
The computer and wiring harness must be removed from the donor car to run the engine when it is moved to the truck. Many of the wires/connectors are not essential to run the engine, and can be removed from the harness.
Getting all of the electronics for the fuel injection proved to be quite a challenge, and was definately something that I enjoyed. I stripped the interior and the engine compartment of the car and removed everything that was not engine/ignition related. I labeled all of the connections, and also labeled which ones I needed to keep, and which ones that I could get rid of. I then took the harness out of the car and did a major surgery on it. In all, I removed 8 lbs of wire from the harness. After I completed the modification, I stuck the harness back into the Supra to be sure that it still started and ran before I finally removed everything to start the swap.
I would say that if you do decide to do this swap, you should really purchase an entire donor car. I would have been totally lost without having disassembled the whole thing myself. I have in fact tried to sort the EFI wiring out of a Celica wiring harness in the past and it REALLY didn't go well.
At the time of writing, this swap is still underway. Please check back regularly for
additions to the article.