Sl0wbaltSS

I raced the cobra last night, only lost by 1 car length. But I can feel the car pulling until I hit 5800 then it feels like i'm hitting a wall and I shifted at 6400.

I don't have any actually things to look at the way the car is running so I had to barrow my local shop's super expensive fancy scanner tool. I was able to bring up rpm, lambda, and stft. Stft was all over the place from -18 to 20. Lambda was from .95 to 1.05 driving around town and .95 to I think .87 at top end so I believe it's running on a GMS1 tune but hp tuned to turn off cat warmup and disable 2nd o2 sensor and codes. I don't know anyone locally with a hpt box to log and the closest person I know with one in in Tuscon almost 2 hours away.

I also beat a black LSJ with a ported eaton sc.
Vid

cluelessk

It's the tiny K04. It's useless at high rpms.

blueLNFftw

iTrader: (16)

That is a little early for boost to be falling off.
Can you log it?

ae_xiong

iTrader: (3)

Y did u shift so late? Especially since u even felt it losing power already. U dont have to rev it all the way to the red line buddy, it doesn't have V-tec! Try shifting right at 6k rpm n u will be fine. Plus u have gms1 too so dont expect much from a cheap canned tune. FYI, gms1 was to keep ur warrenty... not help u beat a cobra.

Sl0wbaltSS

I don't have a hpt box. Does it take credits to log a car? it is hp tuned to shut off cat warmup and turn off o2 sensor codes because there is no 2nd o2 sensor. A guy my buddy went to before for his mustang might have an hptbox that I could use to datalog but besides that I would have to find another cobalt owner in az or someone with it. 2nd closest person I know with a box is in Tuscon.

Someone bring area47 in here!

06blackbalt

iTrader: (3)

What were the mods on the lsj

blueLNFftw

iTrader: (16)

No credits to log it.

I am just curious to see if it has another issue or is knocking. The "it hit a wall" doesnt sound right.

chris88z24

No, the factory turbo is what's shitty.

blueLNFftw

iTrader: (16)

Yea? What cars in our price range came with better ones?





It shouldnt hit a wall, fall off, yes, but not hit a wall

63 Nova SS

iTrader: (3)

Yep, the little ko4 is a good little turbo for what it is.

chris88z24

Shitty for what the OP is using it for, is what I meant. The SS Tc was in a category of its own when they were on sale.

Sl0wbaltSS

Intake, headers, catless whatever, pulley, ported blower, onjectors, I'm not sure about a heat exchanger.

footballplaya3k

iTrader: (1)

So you're shifting past redline on a stock turbo and you're complaining about not having power...really?

Sl0wbaltSS

No, I'm complaing about how it lost soo much power at 5800 all of a sudden. Power stayed the same from 5800 to 6400 when I shifted.

Omiotek

iTrader: (2)

the turbo doesn't make power passed like 5500 pretty much.

tomj77

iTrader: (2)

also gms1 wont get u the power that hp2 or even trifecta will get u. ud have won if u had those probably

Sl0wbaltSS

I know that.

LNFTX

I dont think there is anything wrong with it my car is bone stock still and it loses power pretty noticeably around 5800-5900 k04 is a great low and mid range turbo it just lacks the size needed for high rpm operation and again gms1 is not a shitty tune it wont be as good as a decent hp tune but it will never be whats wrong with your car

Cobalt_Daddy

i personaly like my GMS1 tune. the power drops off in higher RPM's. i thought this was common knowledge? You shouldn't have to rev it to the redline to make power.. it's not a honda and you aren't in the F&F movies.

rnjmur

The stock GMS1 tune has power drop off after 5500. The torque drops from 85% at 5500 to 70% at 6000. The power loss is consistant but at about 5800 you hit 10% torque drop off and that is probably why you start to feel it.

Area47

it is limited for emissions reasons.

the stock turbo can hold 22psi at redline if the numbers are tweaked right,

ATOMbomb

What does the ko3 drop at on the st?

Staged07SS

iTrader: (25)

I dont know the exact rpm, but the ST's torque curve looks like a downhill ski slope.

Peaks real early and drops like a mo fo. Be happy the SS/TC came with a nice torque/power curve.

blueLNFftw

iTrader: (16)

Stock LSJ have a good chance at beating ST's

63 Nova SS

iTrader: (3)

Wonder how the awd's will do?