hoonigann

iTrader: (3)

Hey guys I just finished installing some longtube headers and the car runs like poop. It's a ls1 with 243 heads and a ls6 hot cam. After about 1/3 of throttle input the car starts to backfire and pop out the exhaust. It also doesn't accelerate well at all. Any ideas as to what it might be?

Thanks!

chrysler kid

iTrader: (14)

You have an exhaust leak that is affecting the front oxygen sensors.

hoonigann

iTrader: (3)

Ooooo ok. I had to extent the oxygen sensors too. I might have messed up the wiring. Could it be that as well?

hoonigann

iTrader: (3)

Also what's the best way to find an exhaust leak

tech@WS6store

iTrader: (2)

You need a tune. That is why.

hoonigann

iTrader: (3)

That too. It had mid length headers and decatted t pipe before tho

chrysler kid

iTrader: (14)

Possibly, disconnect the front oxygen sensors to see if the car runs better.

To find an exhaust leak, the best way is to get under the car when it's cold, start the car and then feel around the exhaust pipes for any air coming out

hoonigann

iTrader: (3)

Good idea. Thanks!

hoonigann

iTrader: (3)

Turns out I fucked up the spark plugs. Replaced them with Ngk tr55's and now it's running fantastic

tech@WS6store

iTrader: (2)

Good news...but you still need a tune if you do not have one

hoonigann

iTrader: (3)

Oh ya I'm getting a tune this coming Monday

G Atsma

So how are you passing Calif. smog test with long tubes?

hoonigann

iTrader: (3)

With cars with obd2, they just plug a computer in and make sure there's no obvious aftermarket stuff and that all the emissions stuff is in the engine bay. If your headers aren't chrome, or very obviously aftermarket, you are fine

G Atsma

Interesting! Yeah, I knew the OBD2 changed the game, but to me, any headers would be pretty obvious, as Gen IV Camaros all came with cast manifolds. I thought the mere sight of headers would flunk a test at the outset. Maybe times are getting better!

hoonigann

iTrader: (3)

Ya I mean as long as it's not bright and flashy, your exhaust should be fine

G Atsma

Cool! Always good to learn stuff like this! Thanks!

hoonigann

iTrader: (3)

Anytime!

SlasherVRGR

iTrader: (1)

Mine didn't come with cast iron manifolds.

98s got these

G Atsma

That's right! The earlier LS1's came with "tubular exhaust manifolds". Calling them headers would be a stretch, as the later cast manifolds actually outperformed them. Or so I've heard.

tech@WS6store

iTrader: (2)

Iirc they were cast stainless