Doing all the required services while its in the 'hospital,' waiting on parts...
Also, I'm writing a new tune with even leaner high-vacuum cruise fuel curves and a progressive, high-rpm timing retard. which will give even better fuel economy and better pull under load.
These all-aluminum, 3-valve V8 engines like to run between 180-190°F coolant temps and 220-225°F cylinder head metal temperatures. I use a 160°F thermostat and cooling fan on/off values of 195/187° which keeps the engine right around 190°F without causing a higher-rated thermostat to fluctuate, which causes temperatures to spike up and down.
I also retain the factory catalytic/exhaust temperature control function that most performance tunes disable. This is critical to long catalyst and sensor life.
Cold start RPM spike is disabled and idle is set to 920 RPM.
The factory 115 mph speed limiter is disabled
Traction Control System is programmed to accept 30% wheelspin, so there is none of the typical on/off 'jerking' that you encounter with a stock TRAC system...just a smooth tail recovery under power.
Speedometer is electronically corrected to accommodate the 4.30 gear and 275/35/20 tires.
Part-throttle ignition timing at cruise is 48°BTDC, which gives lower EGT's, lower coolant temps and improved fuel economy.
I experimented with an aftermarket cold air intake, but it actually increasef IAT's, so i returned to stock.
This is so much easier than carburetors and magnetos...
