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Electric coolant pump wont help unless you have an alt delete.
I run an electric coolant pump and don't believe it did much for fuel economy.
Now, the electric cooling fan conversion was a great mod, netted up to 2mpg.
Exhaust mods typically don't offer much if any returns. While I was running my diesel suburban N/A I did a back pressure test. I didn't see much back pressure at all.
It was one of the last mods I did to my N/A configuration, when completed I didn't see any fuel economy increase.
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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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