How to make my 2004 gmc sierra 4dr v8 350 5.3L truck faster?

Question

i have a 2004 gmc sierra 4dr. its a v8 350 either 5.3l or 5.7 l engine. i have a KandN intake system installed, and a computer programmer installed and set on performance. i also have 22's rims and 30in tires on it. i really want my truck fast. but with all this on it i dont feel that its got that drag race speed. i want to know what i should do to make it live up to my standards. when im at a stop light and i punch it, it seems like it is taking way to long to get to 60mph. in my buddies truck with no upgrades it seems to be able to burnout from a stop and faster. i dont know if i need to do something to my first gear or what, i just want it to be burning tires by punching it down from a dead stop and just plain old muscle. please help.

Answer 1

Well lets start with a rather anemic power source and add tons too much wheel and another ton of too much rubber and see what happens? Besides the fact that you have thrown the gear ratio clear out the door you also expact the meager power plant to turn 4 huge flywheels. Nascar stock cars run 200mph on 15" wheels and tires.

Answer 2

First post = correct.

Your 325 (not 350) has plenty of power, but you added those stupid wheels and did not regear, so now your fuel mileage and acceleration went to h**l.

Regear and your problems are solved.

Answer 3

So idiotic. Why do you need this? Muscle is out, fuel economy is in.

Get a grip, hot dog.

  

Answer 4

first off 22's are too big for any perfomance. you'll want somewhere around 19's and lighter rims. Those 22's can be pretty heavy. Also, if you don't live in a smog controlled area then and exhaust would be your next step (headers).

Also, you're buddies truck is probably smaller, you have a 4 door which distributes/equalizes more of the weight to the rear of the truck giving you more traction, as with your buddies truck it probably is muuuuch lighter in the rear and letting it slip all over the place and get up to speeds faster if really needed. It's jsut cause you have the bigger truck. The extra room means more weight and different performance.

An exhaust though would definately be your next step. Also you could get a bigger throttle body but that'd need to be installed and tuned by a professional.

Answer 5

First of all your 350 is a 5.7 lt. he K7N filter and intake is a good start. Now that you have air flowing into your engine you have to let it out. Upgrade the exhaust with a 3 or 4 inch system with high flow caddy converters and something like Magna flo mufflers.

Your 350 should be roasting the tires at will when you goose the throttle. You might have a timing issue. Have the engines timing checked and corrected if need be. Are your tires inflated to the correct pressure? This can make a vehicle very sluggish and inefficient. You might have the T.P.S. (throttle position sensor) checked for correct voltage. It may be defective and holding back your truck. If the voltage is too high or low you can slot one of the mounting holes on the sensor and very, very minutely adjust the position of the sensor till you get a reading of .94 volts. The difference is like night and day. How long has it been since you changed the trans fluid and filter? Iridium plugs indexed toward the intake as well as larger plug wires will add a couple to a few horses. I know you have a K&N filter but is it clean? I clean mine every 5000 miles.

If you have a"check engine soon" light on in your truck, you should have the codes read asap and address the problems indicated. You can get 12 to 14 extra horses just by turning off your a/c. Your friends truck may be geared lower than yours, enabling his seemingly effortless burnouts. You have 30 inch tires, it takes a lot of power to spin those. Did you modify the computer programmer for the size of your tires? I don't mean did you calibrate the speedometer, putting larger tires on your truck and not telling the computer about it can make your truck like a turtle. Not to mention, harm your transmission.

Check for after market performance computer chips for your truck. The programmer you have is working with a stock computer system, however, in tandem with a hot outlaw chip your Sierra would scream.

I hope at least some of this helps you  

Answer 6

Nitrous oxide.