On the rollers
10-25-2005, 02:29 PM
#1
On the rollers
As posted on the Dyno list:
NAME: BigTex
YEAR: 2003
MODEL: 1500
BODY: ECSB
ENGINE: 6.0L
TRANNY: 4L65E
DRIVE: AWD
MODS: RADIX
LOCKED OR NOT: Locked (I think)
DYNO: Dynojet
DATE: 10/25/2005
HP: 464.4
TQ: 511.8
Mods: Radix 2.75" pulley, EFILive tuning, ASM headers, Flowpro muffler, Comp cam, Flexalite fans, plus the normal bolt ons. 8psi, 93 octane only and 18* timing.
I made a mistake, plain and simple. I forgot to move my speed limiter above 125 mph. On the 3rd gear pulls, the electronic throttle control was shutting the throttle down at 5300 rpms. I didn't realize this until I had already made 3 pulls and noticed the operator was stopping the pulls by 5500 rpms. It pulls well into the 6000s where I normally shift at 6400. Anyway, I think HP numbers would have been higher had the speed limiter been correct, it was pulling well until then.
This was with full exhaust including catalytic converters, full airbox, and the heavy 20" wheels and tires through an AWD drivetrain. I just pulled the front driveshaft to make the pulls. Disregard the air fuel info, it was a tailpipe probe and was getting delayed results.
I'm pleased with the nice flat torque curve and considering my mistake, the numbers are good. Torque is sweet!
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One other thing to notice - look at the time between those two posted pulls. Basically 90 seconds between them. So no cool down time and the power numbers are virtually identical.
NAME: BigTex
YEAR: 2003
MODEL: 1500
BODY: ECSB
ENGINE: 6.0L
TRANNY: 4L65E
DRIVE: AWD
MODS: RADIX
LOCKED OR NOT: Locked (I think)
DYNO: Dynojet
DATE: 10/25/2005
HP: 464.4
TQ: 511.8
Mods: Radix 2.75" pulley, EFILive tuning, ASM headers, Flowpro muffler, Comp cam, Flexalite fans, plus the normal bolt ons. 8psi, 93 octane only and 18* timing.
I made a mistake, plain and simple. I forgot to move my speed limiter above 125 mph. On the 3rd gear pulls, the electronic throttle control was shutting the throttle down at 5300 rpms. I didn't realize this until I had already made 3 pulls and noticed the operator was stopping the pulls by 5500 rpms. It pulls well into the 6000s where I normally shift at 6400. Anyway, I think HP numbers would have been higher had the speed limiter been correct, it was pulling well until then.
This was with full exhaust including catalytic converters, full airbox, and the heavy 20" wheels and tires through an AWD drivetrain. I just pulled the front driveshaft to make the pulls. Disregard the air fuel info, it was a tailpipe probe and was getting delayed results.
I'm pleased with the nice flat torque curve and considering my mistake, the numbers are good. Torque is sweet!
----------
One other thing to notice - look at the time between those two posted pulls. Basically 90 seconds between them. So no cool down time and the power numbers are virtually identical.
10-25-2005, 02:32 PM
#3
Oh yeah, Speedtek in Haltom City TX is having a dyno day this Saturday from 9-5 with food during lunch. I'm thinking about pulling off that trashcan muffler, stock airbox, raising up the speed limiter and running it again. They said its $35 for 3 pulls. Any other truck guys want to join in?
I'm tempted to add a splash of race gas and bump up the timing a little too.
I'm tempted to add a splash of race gas and bump up the timing a little too.
