Power increase @ 4000 miles ???
Yesterday morning on the way to work I passed the 4K mile mark on my '08 Sierra Denali. Had to run a couple of errands mid-morning and it was VERY apparent that the truck was more responsive to the throttle and seemed to have quite a bit more torque and power.
My question is - I'm wondering if there is some sort of "limiter" in the OEM engine calibration which won't allow full power until a certain pre-determined mileage?
Has anyone else noticed this?
Regards,
"455HO" Lloyd
'08 Sierra Denali 2WD, 14.43 @ 97.50, AIRAID mid-tube 1 7/8" ARH LTs, 275/55s on Yukon wheels
1972 Firebird Formula 455HO/M40, Lucerne Blue/Blue, 12.93 @ 106 @ the Texas Motorplex
I think she is just starting to loosen up.
Gone, but not forgotten!
i have a 08 denali as well, its not quite to 4000 but i havent noticed anything like this
01 Silverado
Oh thats because its a GMC and not a chevyOriginally Posted by mitch cobb racing
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AZRAEL
2017 RZR 1000 2 SEATER
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The difference between winning and losing, is having a 2nd stage.
I found a GM Powertrain document with an engineer's e-mail addy, and sent him a message.
Not really expecting a reply, but we'll see.
Regards,
"455HO" Lloyd
'08 Sierra Denali 2WD, 14.43 @ 97.50, AIRAID mid-tube 1 7/8" ARH LTs, 275/55s on Yukon wheels
1972 Firebird Formula 455HO/M40, Lucerne Blue/Blue, 12.93 @ 106 @ the Texas Motorplex
I doubt GM put a "break-in governor" on their new 6.2L motors. Maybe your floor mat was bunched up behind the gas pedal before now?
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
I wouldn't be surprised if they did, though. Over the years I've seen GM come up with some really dumb ideas. And I know the technology exists, when I bought new 4 wheelers, the dealer told me that the engine would "run better and have more power" after 300 miles, and he was right. He says something is programmed into the computer, has to do with break-in period.
2001 ECSB 4x4, 5.3, Radix, 3.0 pulley, VHP Trucker cam, 216/224 .551/.551 115 lsa, 1.8 Crane roller rockers, 4L65E, Yank SC3000, 3.73, Cal-Tracs, HPTuners.
Well, according to the GM Powertrain engineer, it is nothing to do with the PCM programming.
Copied and pasted (in qoutes below) from his reply to my e-mail:
"Mr. Coulson,
There is nothing we do to restrict performance. Engines do tend to perform better as they "break-in".
Tom Read
GM Powertrain
Pontiac, Michigan"
Obviously then, this sudden increase in performance was a figment of my imagination.
Regards,
"455HO" Lloyd
'08 Sierra Denali 2WD, 14.43 @ 97.50, AIRAID mid-tube 1 7/8" ARH LTs, 275/55s on Yukon wheels
1972 Firebird Formula 455HO/M40, Lucerne Blue/Blue, 12.93 @ 106 @ the Texas Motorplex
Did you check the floor mat?
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's
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