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I've got the 1988 Toyota Supra MKIII with the 3.0L (2954cc) 7M-GE l6 engine. The transmission is W58 Manual. I want to convert it to a turbo but i can't decide if it's better to build it or just buy a whole new GTE instead. Anywhere I find turbochargers online they're all replacement turbos for the GTE which already had one and I'm not even positive I'm capable of installing it into my GE. I don't think I have the funds to just buy a new GTE. And the problem with building it is the GEs have smaller injectors (330cc vs. the 440cc in a turbo), GEs have a higher compression, the GE ECUs have a more aggressive timing map where I'd be making boost, it doesn't have oil squirters, there's only one knock sensor, and the spark plug gap would probably be too large with boost. On top of that I'd have to run with the highest octane level I can find and probably couldn't go much higher than stock boost levels which is like 7psi. I might even need an S-AFC to tune the car since the fuel maps were designed for a boosted car. Even though it'd be cheaper to build than to buy, it's still gonna take a fair amount of money depending on the cost of the turbo charger, if i feel like i need a cold air intake system since the Supras already run so hot, and what I have to spend on other parts and tools to make the conversion possible. It's going to take lots of time and help since I'm not knowledgable enough to do it myself. My question is, is it worth it to buy a turbo charger replacement for the GTE and spend the time converting the GE to a turbo? Or should I just save up a few grand and buy a 7M-GTE like it is?
 

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To do it right, swap in the GTE ECU, ECU harness, Engine, R154 Trans, and Turbo LSD diff(different ratio) then install all (at least stock) the IC pipes and IC and a turbo downpipe.
 

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Now that I think about it more, with an 88, I'd just drop in a 1JZ, there's lots of JDM drop-ins that'll just work with the 88 and will cost about the same.
 
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