Hi im actually new to the site but i have a 07 SS SC and i am encountering a few problems. I have a stage 2 kit with a cold air intake and GM catback exhaust, when i accelerate in 2nd gear under full throttle conditions i have a lag that happens around 2500 to 3000 RPM also same kinda thing happens when im cornering i have had the fuel pump and filter replaced under warranty and i also had to have my cat replaced once around 10,000 km. If anyone had some problems like this can you please let me know what you had done at your service department because the one at the dealership that i work at can't seem to figure it out.

 

you're out of the car's efficiency range, it's not a problem, you just need to learn how to drive a manual car a little better. any manual car ever made will accelerate very slowly if you're at too low of an rpm. 2,000 rpm in 2nd gear is like 20 mph, and you won't feel any power really untill you get the rpm's up

 

so basically shift to first to get the acceleration...or rev it in between gears (not so good for it)

 

rofl.... 1st gear to 6,000 rpm then second 6,000 rpm etc etc you can't race shifting at 2,000 rpm of course you'll have no power...

 

1 bad shift at 6 grand! There goes ur motor and clutch lol if your having trouble shifting at low speeds rallying is not the solution

 

Braaaaa Bop Bop Bop Bang!

 

you should NEVER shift to first gear unless you're stopped. if you're low in 2nd, and need to move, slowly press the gas further and further down, don't just floor it at 2,000 rpm. and no, don't rev it in between gears either.

the only time i would ever suggest shifting to first is in an absolute emergency, like if someone behind you is not stopping and you have to really get out of the way before they smack into you. other than that, it's a big ole no no. and racing is not an emergency

 

i dont really think your getting what im saying, first of all im definately not shifting down to 1st gear cause thats just stupid. When i accelerate it is under good conditions and its not 100% full throttle but at 2500 RPM it should not happen, sometimes its worse then others but what im wondering is could something be wrong with the ecu because when i first got the kit put in they forgot to flash the ecu with the code from GM but after about 3,000km this problem started to occur.

 

are you saying you don't have the flash?

but i AM understanding what you're saying. and yes at 2500 rpm's your car will not be accelerating quickly. you won't accelerate much till you're over 4,000 rpms in 2nd. anything under that will take a while to get moving. that's normal.

 

i have the flash now but at first i didnt. but the power is of course less at lower rpms and i can understand that but what i am getting is a hesitation. its almost as if all the power to the car pauses for a second and then picks back up again. usually this only happens when i have under a 1/4 tank of gas but now it is happening more often.

 

that's called bogging. you must just not be explaining it fully or something. because so far, it's 100% normal what you're saying

 

i know what bogging feels like and definately sure its not bogging and i do have a few friends who are technicians and have driven my car and even they were stumped by whats happening but let me ask you one other thing. Are you guys having problems with your brakes because i have been through 1 set and had to have them turned twice already and i only have 25,000 km on my car.

 

the problem with the brakes is that the pads are hard, and the rotors are soft. the pads rip through them badly if you're heavy on the brakes. i recently purchased some hawk hps pads, and ebc rotors, and damn, what a difference it made.

can you maybe get a video of what's happening in your car?

 

ya i may be able to get a video im gonna talk to a buddy of mine and see if he can help me with that and i will let you know. thanks for all your help buddy i really appreciate it.

 

you're welcome

 

Maybe this

Cylinder Miss On Left Turns And Cylinder 4 Miss On Right Turns - Possible Fuel Contamination - keywords CEL contaminated controls cylinders gas injector intermittent MIL misfire P0300 P0301 rail rust #PIP3333A

Condition/Concern:
On rare occasions, an intermittent engine misfire may be experienced on cylinder 1 during/following a left turn or on cylinder 4 during/following a right turn. The misfire may / will typically last up to 10 seconds. A SES light and DTCs P0300, P0301, and/or P0304 may also be present if the misfire lasts long enough.

This may be the result of fuel contamination and is more likely to occur on vehicles with a returnless fuel rail because it is easier for fuel contaminates to become trapped in a returnless fuel rail since they do not have a fuel return line that returns fuel back to the fuel tank. As a result, any fuel contaminates that make it to the fuel rail tend to gather over the #1 fuel injector inlet when turning left and tend to gather over the #4 fuel injector inlet when turning right, causing this concern. The cylinder next to the fuel feed line (1 or 4 depending on the model) may also experience some random misfires at idle as contaminates enter the fuel rail from the fuel tank.

 

good find, but that doesn't sound like the issue at all.

 

Have you changed the plugs? Could be spark blowout when the motor is heavily loaded.

 

It is definately not the plugs i have had those checked as well but coblasts found there is awesome that pretty much sounds like what is happening, well it makes the most sense at least.

ya that is only one of the problems im having. i was also just taking a look around the engine bay with a friend of my yesterday and i found that my ecu is not stationary it will definately move and bounce if i hit bumps or something. i can basically without any effort really just pull it out if it wasnt hooked up to the wiring harness

 

2nd gear in our car is prety tall compared to first. i think theres a larger diff. between the 1st and 2nd gears of our car than most. it really does just sound like its bogging. IMO. where do you usually shift from 1st to 2nd?

 

Almost sounds like you're trying to say that you're car is missing....Try putting 1 step colder plugs in and see if that helps.

 

normally i will shift around 3,000 rpm and when i start to push it in 2nd maybe it is bogging but im not too sure. i got the shop foreman at my dealership to drive my car and he does not seem to think its bogging but who knows.

 

does it almost feel as if your supercharger isnt kickin in at all?