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I say hack out that smog pump. Its a useless piece of junk and gut that catalytic converter its so old its likely partially clogged.
Gasoline engines typically dont see any improvement in fuel economy with water injection.
You might need to rig in a real turbocharger if you are having trouble with elevation and hills. Thats what I am doing.
You may want to try a cylinder head up grade, see if toyota makes a newer version of what will bolt to that block. Chevy camaro V6 guys would do this, they would switch from cast iron RWD heads to aluminum FWD car heads and intake and gain about 100hp and get the same fuel economy.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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