dreadedboost

iTrader: (4)

This is my first ls1 f-body, just did a full tuneup on it and there are no codes. My 04 GTO felt quite a bit faster. Its bone stock except for a few free mods 76k a4 2.73 rear. It won't even spin the tires if you try.

BottleFedZ346

iTrader: (17)

The 2.73 gear doesnt help at all!

firebird99

iTrader: (2)

Leave the gears and add a stall ASAP!!!!

Endersshadow

iTrader: (1)

If you can't spin the tires in your RWD muscle/pony car you should probably sell it.

chadroosa

iTrader: (14)

holy hell, think my 2.2 cavalier is fast than that... 3.73s, stall and exhaust

redtail2426

iTrader: (10)

looks like you might be missing like 6 spark plug wires,or your driving into 100mph winds,either way its not good

venom ws7

iTrader: (13)

3.42 and retune set the shift 6200-6300rpm you'll think you added nitrous...
Are you sure your TB is opening all the way? I'm not joking I drove a couple of bone stock F-bodies with 2.73 but that was very slow 250-270rwhp maybe?

ROMERO98Z28

yeah that was slow a$$ hell.get 3.73 and a stall asap

LS WON A4

iTrader: (1)

Holy crap! And I thought my Z28 was slow (also stock)!

TheBlackSS

iTrader: (6)

even bone stock with 2.73's shouldnt be that slow. theres something wrong.

dreadedboost

iTrader: (4)

It definetly feels choked off, meaning like it sounds like its running hard but as soon as you open it more than 1/2 or so and gets above 2k rpm it feels like something is holding it back....clogged cats? Its faster at half throttle than at WOT also by a large margin.

unit213

What's a "full tuneup"?

dreadedboost

iTrader: (4)

Plugs/wires, air filter, pcv valve, fuel filter, oil change. Sadly most of the stuff I replaced was in good shape.

TheSilverOne

iTrader: (22)

how many miles? is the mat not causing the gas pedal to go down all the way?

unit213

I thought you meant that you actually had it tuned. Compression / leak down test will tell the tale...

07 z71 silverado

wow that is super slow. I wuld do a compression test. take cats off get a tune and see how it runs.

dreadedboost

iTrader: (4)

Taking cats off tomorrow, it gets full wot even w/ the mat in the floor, 76k. The half throttle feeling stronger is what gets me.

Mazzenger

iTrader: (5)

I remember when a buddy of mine and I went looking for to get him an f-body. We drove the crap out 10 different cars and were LS1's and stock. There was a huge difference between them. He ended up getting an A4 w/2:73s and it had troubles spinning the tires.

gnx

instead of taking off the cats just remove the o2 sensor after it gets hot and see if the issue goes away if not check the back pressure

TheBlackSS

iTrader: (6)

I've experienced that very same thing in a chevy truck with 5.3 that turned out to be clogged cats.

You could check them with a back pressure gauge if you can get your hands on one. Like unit213 said, compression test and leak down test would be good idea as well. Theres quite a few things that can cause lack of power like that. i wouldnt spend any money on mods until you get it running 100%.

Do all the wheels spin freely with the car jacked up? Dont wanna overlook something dumb like a seized caliper or something.