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All the guys that clam there engine is most efficient around 2000RPMs, live by that code and believe its the best engine speed for there truck to run at are the ones that will never see over 20mpg.
After I install the intercooled turbo set up with water injection I may swap to 2.73 rear end gears. Could end up just shy of 35mpg with just using mostly 1980s and 1990s technology.
One problem I see is you could get the engine chugging along at a low enough RPM to where the alternator does not produce enough power to run the electrical system.
Another would be if you had an auto transmission, the pump pressure out put could be so low that you are sliping your torque converter lock up when chuging along. I can adjust the pressure on my TH700R4 so it wont be a problem for me and the 6.2L came with just about the lowest stall converter ever produced.
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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.
Last edited by oil pan 4; 09-05-2011 at 07:05 PM..
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