well i was wondering why the 85 is a better year car to work with, because everybody says that it has a better ECU. and also i also heard that if you go 6m turbo you at the most can only go about 15psi. i dont know but if you can help me out with these questions it would be a great deal to me i want to go 6m turbo.thanks
That's not true about 85 being a better car to add turbo. I think it's 84-86 due to upgraded EFI system. Not recommended to boost up to 15 psi without engine/fuel/exhaust/intake upgrades. Stay around 6 psi with stock engine and injectors.
If installing a 6m, then 84+ is easier because all of the accessory pulleys, pwr steering, alt, a/c, water pump, match and line up with the 6m crank pulley. If you put a 6m in 82-83, then you have to source those pulleys from an 84+ supra or possibly cressida. But now on to the more important advice: Do Not, and I'll repeat with more emphasis, DO NOT! build a 6m turbo unless you already HAVE a 6m in your car, in which case the principal of sunk cost applies. And apparently you haven't even bought a chassis to start with yet so there is hope that we can save you from wasteing thousands of dollars. For nearly the same money as buying a used 6m and turbocharging it, you can buy a wrecked mk3 turbo parts car and swap the whole motor, ecu and everything. Then you'll have a toyota factory turbo motor thats far more reliable and since you want to make 15psi, there's still some aftermarket support for the 7mgte as opposed to NONE for the 5m/6m series. About the most you can SAFELY get out of a 5m or 6m with turbo and the stock ecu and injectors is 8-10psi. Beyond that, you need programmable ecu and much larger injectors and thats much more expensive than a 7mgte swap which can get you to 12-14psi with only a few upgrades.