hog

There were many people who complained about the lack of torque in the 1999 5.3 engines. You say you need the upper rpm power once you get it rolling is where it matters. But what if it a dog up until that point? I would think the majority of people who need torque for pulling loads would like a lot of that torque right around their cruise rpm. The 5.7 equipped trucks didnt need the downshifts into 3rd or even 2nd gear that the 99 5.3 did.
A few of my friends bought 99 trucks and had some problems pullingtheir boats out of the lauch in 4hi, most had to resort to 4 lo. The 350 equipped trucks had no problems. It took a few years but GM finally got the torque number up to and past where the L31 350 left off, albeit at 1200rpm higher. Its too bad GM stuck that brutal L31 intake on top of the best GEN 1 heads from the factory. They should have installed an aluminum marine intakle manifold with external injectors from the get go. I have noticed some much better 4000-5800 rpm power in my truck now that all the injectors, fuel pressure regulator and imjector feed lines are outside of the plenum, instead of obstructing flow throughout the intake.

I personally have never been beat by a 5.3 equipped truck in a 0-60mph race. I think that there just arent any quick 5.3 trucks around my neck of the woods. I never see any at the dragstrip either. I am not say saying that 5.3L trucks arent faster or quicker in the 1/4 mile, because they are. I just wish there were some modified 5.3's that I could play with. From a dig it would be a good race, from a roll, I would be seing taillights, well for now anyways.

Hog

simcik1

How do I find out what gears he has? Is there something on the VIN for this as well?

jleews6

iTrader: (1)

my 04 RCLB with a 5.3 A/4 with 3.73 gear went a best of 14.64 @ 92 mph. The only thing I did was I removed the stock filter. I feel that with some more time I could get it to run in the 14.40 range.

WhiteChevy3

is this the full reason the 99 5.3s are weaker than the 2000-up?

budhayes3

iTrader: (19)

I think it's a combination of the cam and PCM tuning. 99's (and 00's) seem to be lacking in the factory tune, and 99's actually have smaller injectors than 00 and up (21lb/ hr vs. 24.7lb/hr).

I never ran mine bone stock, but with K&N, Gibson shorties and catback, no tuning and big heavy BFG 285/75R 16's (33's), I went 16.5@81.7. (Full street weight w/ no weight reduction and a PaceEdward's roll top tonneau that's quite heavy)

95ImpSS

iTrader: (2)

Check da sig... Not bad for a stock grocery wagon.

Pjstucn

Stock quarter = 16.7 at 81mph witha 4.8 and automatic

2004 ecsb 4x4 no mods, tail gate down and mirrors folded in

Lord Aries

iTrader: (6)

Best run I ever got was a 15.8sec-1/4 mile with a custom exhaust and a cone in place of the airbox (basicaly stock)... 1/4mile times with the turbo will come on the 2nd of December at a track GTG...

JJz28

iTrader: (71)

I had a 1999 reg cab with a 5.3 and 3:42 gears, bone stock at the Texas Motorplex in 3rd gear with tow haul on it ran consistent 15.73's with a real crappy 60 ft. time. Open rear end.
I now have a 2005 reg cab with a 5.3 and i can tell that there is more power and torque. It should run 15.50's or a little better. Locking rear end.
1999= 270 hp.
2005= 295 hp.

rippedcamel

I ran a 15.4 bone stock with my 04 rcsb 5.3 with a outside temp of 60 degrees.

I only gained .1 in the 1/4 by adding a magnaflow dual exhaust and a K&N drop in filter which put me at 15.372@88.38