im sittin here arguing with my dad about if i have to have a tune to drive my car... im goin from stage 2 to 60's,2.8, and a heat exchanger and etc..... he say i can drive it as much as i want... will it hurt the car to drive it or not?

 

u are correct in assuming that you know more about this than your dad.

 

tell your dad you will drive it, as long as he pays for the repair bill when it pops

get a tune. you can't just add injectors like that.

 

after upgrades your best bet is to get a tune to all for most power with the best protection for the car so something doesnt blow so yes tune it

 

yes u will need a tune. the only vehicle i heard u can add injectors to without a tune is a diesel.

 

if your changing your injectors it needs to be retuned. if you change the pully without the injectors you will run a little lean but you should be fine i have heard of people running stage 2 with a 2.8

 

my dads a freakin genius when it comes to cars... hes sae certified in like anything lol but i dont think i cant jus drive like normal without it hurtin anything....

 

not aftermarket performance he's not. you SHOULD be fine with the 2.8 on the stage tune, most people would recommend against it though. but injectors, you HAVE to tune for.

 

just tune it and you wont have anything to worry about

 

Now i'm jst thinking out loud but..... the car is still going to try and run at the commanded AFR right ? So when you drop 60's in are they just going to pour fuel for no reason? Or cant the pcm control the injectors to get them close to the commanded afr? I guess im wondering why the computer cant adjust the injectors to commanded afr at a lower IDC.

When i did my stage kit i installed the 42's and drove to the dealer for the flash. To tell you the truth if i hadn't know they were in there.... i wouldn't have know the difference. It idled the same and ran perfect on the stock tune.

 

you definetely need a t00n

 

just go up to your pop and be like hey dad read this. i posted this on my forum to prove i do need a tune. here are several comments from guys that owned cobalts for YEARS and they know what there talking about... show him your question... reveal all the answers... oh and yes you need a tune lol. bigger injectors need different flow rate/ a/f ratio has to be altered...