99yellowz28

I have a set of hooker headers, hooker Y pipe, ls6 intake, slp air box, borla exhaust with a MagnaFlow converter and a tsp torquer v3 cam and the exhaust smells real bad even sitting at a stop light it just stinks. Does anybody else have this problemiI wasn't sure if it's normal because it didn't do it until I put the headers on and tune

elephantrider

iTrader: (2)

did you keep the cat ?

99yellowz28

Yeah the converter is still on there it's just a little high flow cat so it will pass e check

elephantrider

iTrader: (2)

headers are mos def going to make it stinkier.

Old Geezer

iTrader: (3)

Leaks?

99yellowz28

no it comes out the tail pipes if it idles in the garage it's real bad kinda bothers my eyes as well

ragtopz28

iTrader: (57)

Is the tune spot on or rich? That's a decent size cam and I believe you will always have some "smell". Stink is a hard thing to measure, people have different tolerance levels. Imagine if you had no cats...

redtan

iTrader: (5)

It's expected with a cam that has that much overlap. You can tune some of it out by playing with timing and injector pulse, but other than that not much you can do. It's just the nature of the beast.

ragtopz28

iTrader: (57)

^^Yep...I like to watch the rear view mirror at stop lights, (people adjusting the A/C ***** and little old ladies fanning their noses) funny and sometime dirty looks.

Monte4ever

iTrader: (2)

I put a couple gallons of 110 in my tank to help with the smell and for the octane boost.

Old Geezer

iTrader: (3)

w/ headers and that cat, does it get up to temp, and light off?
O2's and headers could have issues w/ them not being hot enough.
Have you tuned it in open loop, and taken the O2's out of the loop?
Does it stink like rotten eggs? If so, the converter is toast.
Is it there to make it actually pass smog, or just for visual insp?
Tap on it and see if the brick is broken..
It may not have enough cell count to handle that cam/tune.

Nicelysedate

iTrader: (3)

This is what made mine better^^

Change the EOIT to make the injector stop firing so early. With a bunch of overlap the injector comes on with the exhaust valve still open and the gas goes right out with it.

There is a lengthy article on hptuners that deals with this exact subject. I did mine on the dyno to make sure I wasn't losing power.

Mike454SS

iTrader: (4)

It's the injector timing usually. As mentioned above, at lower RPM, you're spraying a lot of fuel right out the exhaust valve. I'd bet the EOIT is still stock in your tune.

If you adjust it to correct the smell, you'll also need to touch up the VE table and MAF calibration, especially at lower RPM, it will have an effect on it.

99yellowz28

My buddy does my tunning I have hp tuners pro and a efx wideband I'm not really sure what he has things set at but when it idles in the garage it burns your eyes. As far as cats go I've debated on removing the one and installing 1 one each side of the Y pipe to hopefully cut down on the smell but mostly because at mid to higher rpm (not wot) the exhaust has that cheap ricer sound and putting in that one cat made a difference and i have a adjustable borla exhaust so I put the middle restrictor plate in. I do think my muffler is bad because it you get on it and come back to a normal rpm it has a drone sound till you shut the car off and cools down a bit

99yellowz28

And yes the converter is there also for e check purposes they checked my whole exhaust system out thoroughly last and even popped the hood

Nicelysedate

iTrader: (3)

This is what you need to mess with