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Owner: Olympiadis
1991ChevyC1500pickup: 1991 Chevy C1500
Displacement: 5.7 L
Fuel type: gasoline
Transmission: automatic
Curb weight: 4000 lbs
Coefficient of drag: 0
Frontal area: 0 sq.ft.
Instrumentation: vacuum gauge
Description: 1991 Chevy C1500 full-size pickup 5.7 liter V8 engine with TBI (Throttle-body injection), 4-speed automatic 2-wheel drive, with 3.42:1 rear gearing. Used as work truck to haul parts.
Build Thread:
Current Mods: !clutch fan. Electric fan added. PCV filter. Underdrive crank pulley. Air-dam added. 180*F thermostat. Plug-wire separators. Sparkplug clipped ground-straps 1/2 way over tips. 5w-30 oil. Tires at 38 psi. Ported TBI unit. Left and right intake manifold plenums fully divided/separated. Innovate Wide-band O2 sensor.
*Minimum Air Rate (throttle blade opening for idle) increased significantly and IAC (Intake Air Control) steps reduced down to 10-steps for warm operation. This results in less air bypassing the throttle blades and better fuel atomization and distribution at idle.
*Full ECM tune via flash-chip. Tuned to run Open-Loop full time. Many calibrations changed. VE table re-calibrated. IAC, TCC, and DFCO routines modified.
Leaned out cranking & time-out (warm-up) fuel tables, and normal operation tuned to 15.8:1 AFR.

Planned Mods:
Official Fuel Economy Ratings
EPA city 14 mpg(US)
EPA highway 18 mpg(US)
EPA combined 15 mpg(US)

Actual Fuel Economy Performance
Lifetime 24.03 mpg(US)
Last 3 tanks 24.03 mpg(US)
90 days No data entered
View Fuel Log
Last updated: Jul 09, 2010

(Created: 2010-06-20 18:58:58 / Modified: 2012-03-03 22:06:38)

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