don johnson
11-23-2004, 10:20 AM
FYI.... All you Chevy 8.1L owners. I just completed a succession of modifications and documented the dyno results of each. Here were my findings;
Test- 2005 Suburban 4 x 4 8.1L
Stock= 262 HP and 386 ft lbs torque at the rear tires
Added Gibson Shorty headers and cat back= 14 HP and 27 Ft lbs of torque increase
Added Volant Cold Air Induction= 6 HP and 9 ft lbs torque increase
Added Westers tuned computer= 56 HP and 63 ft lbs of torque increase
In total picked up 76 HP and 99 Ft Lbs which maxed at 338 HP and 485 Ft lbs at the rear tires
The Westers tune was by far the biggest add on. Lyndon Westers custom programmed my computer in 4 days and the tune was set up to compliment the headers and cold air. A huge plus of the Westers is the reprogramming reduces the torque management and removes the speed limiter. We are taking the Sub to the river this weekend so we will get a great idea of increase in MPG but just driving around town it seems to have gotten an increase in MPG.
The Westers tune was a huge improvement. The car passes with ease without downshift now and is simply a lot more fun to drive. It drives like an 496 CI motor should now!
For the hell of it I also dyno'ed an Hypertech handheld reprogrammer to compare a handheld/ flash reprogrammer to the Westers custom tune and can tell you that the Hypertech sucks by comparison! The Hypertech did pick up 17 HP and 24 ft lbs of torque. However, not even close to the Westers... Both tunes were set to run on 91 octane.
Test- 2005 Suburban 4 x 4 8.1L
Stock= 262 HP and 386 ft lbs torque at the rear tires
Added Gibson Shorty headers and cat back= 14 HP and 27 Ft lbs of torque increase
Added Volant Cold Air Induction= 6 HP and 9 ft lbs torque increase
Added Westers tuned computer= 56 HP and 63 ft lbs of torque increase
In total picked up 76 HP and 99 Ft Lbs which maxed at 338 HP and 485 Ft lbs at the rear tires
The Westers tune was by far the biggest add on. Lyndon Westers custom programmed my computer in 4 days and the tune was set up to compliment the headers and cold air. A huge plus of the Westers is the reprogramming reduces the torque management and removes the speed limiter. We are taking the Sub to the river this weekend so we will get a great idea of increase in MPG but just driving around town it seems to have gotten an increase in MPG.
The Westers tune was a huge improvement. The car passes with ease without downshift now and is simply a lot more fun to drive. It drives like an 496 CI motor should now!
For the hell of it I also dyno'ed an Hypertech handheld reprogrammer to compare a handheld/ flash reprogrammer to the Westers custom tune and can tell you that the Hypertech sucks by comparison! The Hypertech did pick up 17 HP and 24 ft lbs of torque. However, not even close to the Westers... Both tunes were set to run on 91 octane.