Could someone explain exactly what would be needed to turbo a 1995 eclipse rs with a 420A engine?

Answer 1

first you would need a turbo manifold that will fit the 420A style engine. the 4g63 manifold will not work because the exhaust runners are not the same size, and the holes are mounted in a different configuarion. second you will need a turbo, start small. You can use the 14b from 1g eclipse turbo, or you can use the t25 from the 2g eclipse turbo. or if you want to go BIG then you would upgrade that to a 16g from the evoIII. Intercooler, Oil feed and return lines, Intercooler piping. A remapping of the ECU to accept an OVERBOOST engine code, because the 420A ecu was set to 14.7psi (atmosphere), anything too far over that would throw an engine code. and before you start saying you'll dial down the boost to 10psi, remember, that if you are at 10psi, the computer is reading 24.7. Why? do you ask? because atmosphere (14.7) + (10) turbo boost = 24.7 psi. Coolant feed and return lines, an oil cooler kit, Boost/vacuum gauge, MBC, a Down pipe/flex pipe to replace the one you are about to remove from your car for the very last time. And don't forget the turbo elbow that feeds from the wastegate actuator to the downpipe. last but certainly not least, a compression bypass valve or BOV as some would call it. the 1g eclipse valve will work well since it is an upgrade component on a 2g upgrade path.

Parts and part and part and alot of patience.

or you could save alot of headaches and just buy a turbo eclipse for about the same money as the parts would cost.

if you want to do it the upgrade path, goto hahnracecraft.com and read the walkthrough and they have all the parts necessary to complete the installation for about 2,000 dollars.