With all the talk of the changes in the 02' and 01' LM7s, we put the motors to the test:

Vehicles:

Vehicle 1 (mine as tested in July 01'):
2001 Chevy Silverado standard cab short bed.
5.3L stock trim, 3.73:1 rear gear, same 255/75R16 General tires.
1300 miles on the odometer

Vehicle 2 (skinny-new FSC member):
2002 Chevy Silverado standard cab short bed.
5.3L stock trim, 3.73:1 rear gear, same 255/75R16 General tires.
1150 miles on the odometer

Test conditions:

Vehicle1:
Dynamic AutoSports Dynojet 248C
Weather- 86.9*F 29.46-0.44 in Hg @ 200ft correction 1.02
2nd gear pull

Vehicle2:
Dynamic AutoSports Dynojet 248C
Weather- 66.0*F 29.51-0.44 in Hg @ 200ft correction .99
2nd gear pull

Results:

Vehicle1:
Stock 2nd gear RWHP: 235.6
Stock 2nd gear RWTQ: 263.3

Vehicle 2:
Stock 2nd gear RWHP: 242.4
Stock 2nd gear RWTQ: 271.2

02' produces ~7-8 average RWHP more than 01' (4700-6000)
02' produced ~8-9 average RWTQ more than 01' (4700-6000)

notes:
One observation was the 02' and 01' curves were some what different below 4200. The 01' makes more power and more torque (to the tune of 2-3 RWHP or 2-3 RWTQ). It seems as some tuning or cam specs have been changed. I can't wait to get the new 02' cam on the cam doctor.

Richard

 

Excellent information man! Thanks for sharing.

When I get an HPP3, I plan to re-dyno my GMC in 3rd gear. I only pulled 232 rwhp in 2nd, but that was with 200 miles on the odometer. These LS1-based motors pick up power with mileage.

Tony