RA28 + MX73
Join Date: Mar 2006
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I believe you have either a 6 cylinder 1G-EU engine in a GX71 or a 4 cylinder 21R in an RX70.
Either way, the changes are the same.
The gearbox can be kept but the bellhousing must match the engine.
The computer and wiring harness will also need to match the engine.
Twin cam or single cam doesn't matter as long as you get the correct computer
The exhaust will also need to match the engine.
I am not sure if your engine cross member is suitable for an M series engine (Toyota likes to customise them to each engine).
You would find it easier to upgrade to a twin cam turbo 1G-GTE from Japan.
Same gearbox, mounts, etc as the old engine.
Will need a 1G-GTE computer /harness and a new exhaust.
For the effort involved in swapping to an M series engine, you could swap to a JZ series engine for the same effort.
New gearbox, computer, harness, mounts, exhaust.
The Lexus V8 has also been done in your model.
Search for "Pee Wee" for an example to follow.
Don't forget to upgrade the brakes and suspension too.