Gmt 900 rcsb 4.8
#1
Gmt 900 rcsb 4.8
Friend's truck, ran Wednesday night.
Specs are as follows:
2013 RCSB Silverado 4.8L automatic. Airraid MIT, Speed Engineering 1.75" LTs and ORY, cat back, street tune (87 octane), FTI 3000 stall. 20" SSS replicas with 275/55-20s. Still has a 3.23 open rear, a little over 4800 lbs with driver.
Best time was 15.538 @89.41 on a 2.2XX sixty foot. Best MPH was 90.XX
100% stock the truck ran 16.9 @ 86, very disappointing.
Obviously the gears and wheels are killing it. But, a TSP 216/220 high lift cam and minimum 4.10 gears + a posi are the next mods.
Specs are as follows:
2013 RCSB Silverado 4.8L automatic. Airraid MIT, Speed Engineering 1.75" LTs and ORY, cat back, street tune (87 octane), FTI 3000 stall. 20" SSS replicas with 275/55-20s. Still has a 3.23 open rear, a little over 4800 lbs with driver.
Best time was 15.538 @89.41 on a 2.2XX sixty foot. Best MPH was 90.XX
100% stock the truck ran 16.9 @ 86, very disappointing.
Obviously the gears and wheels are killing it. But, a TSP 216/220 high lift cam and minimum 4.10 gears + a posi are the next mods.
Last edited by Bluecollar Hotrods; 02-10-2017 at 07:47 AM.
#2
TECH Resident
wow, gears and wheels are killing that thing. I had an 08 4.8, same weight. Had a rough tune and 3000 converter, nothing else and it went 14.8. was a 3.73, G80 truck with 17" wheels.
#4
TECH Resident
I just remember the throttle was so dead, even with the converter I never had traction issues with the stock tires.
#5
TECH Apprentice
Here is my old 2008 Sierra ECSB 4x4 full street weight tune only pass. Granted it had the 5.3 and 3.73 gears.
2008 GMC Sierra CK1500 SLE 1/4 mile trap speeds 0-60 - DragTimes.com
2008 GMC Sierra CK1500 SLE 1/4 mile trap speeds 0-60 - DragTimes.com
Last edited by Gorske; 04-28-2017 at 02:40 PM.