BlackTA

iTrader: (1)

Alrighty, prior to putting my long tubes on, I ran a 13.64 @ 103.79.
Then, I put on Jet Hots, a custom 3" y-pipe, changed spark plugs (forget which ones now) and wires (MSD), Swapped the SLP Loudmouth for a Flowmaster muffler (which series I dunno, bought it used), and got the BMR throttle body bypass kit.
Went back to the track, and ran a 13.7 @ 102 or 101...oooook...
Well, I found out that my front two 02 sensors were bad, which are the ones controlling A/F ratio, right? Changed those.
Went back to the track, and ran a 14.1 @ 100....
Now, I know tuning is suggested, but holy crap...

Oh, and as for weather:
13.6 - summer, like 90 degrees or hotter
13.7 - this past January, so probably like 50s, maybe a little cooler
14.1 - a few weeks ago, so like 80s.

I know I'm running a little lean (I can smell it), but I don't think I should be losing 5 tenths and 3 mph. Plus the local F-body tuner pluged his lap top up to my pcm and said I'm only running a little off, though he says tuning would make a world of difference.

Is that All I need? Tuning? Or is something else wrong...?

DD966

iTrader: (3)

Tuning made a difference for me. Is your 60' the same? With LT's you should definitely trap higher than without them.

BlackTA

iTrader: (1)

I don't have my time slips on me, but i believe I went from a 2.0something (the 13.64 run), to a 2.1 or 2.2 (14.1 run).

REDLV SS

Get rid of the flowmaster for a magnaflow or something.

BlackTA

iTrader: (1)

I know the flowmaster muffler doesnt flow as well as most, but it was free and sounds infinitely better to me than long tubes and LM did. Plus I doubt that the muffler alone is going to not only keep me from going faster after long tubes, but make me lose 5 tenths and 3 mph.

Anyone have any ideas?

tim99ws6

iTrader: (31)

dude, get some tires that hook, youre losing your times in your 60'

Go buy a couple of cheap salad shooters, get some M/t drag radials or something of their value, and go see what you run then.....

Your car being a A4, you should be sub 2.0 60'......that's where all the E.t . went....

as for the mph, I'd say a tune will help that out..i dunno where your MPH is going...changed your oil lately? got any SES lights? also, go ahead and change your fuel filter when you change your oil.....def. isnt gonna hurt....

Tim

BlackTA

iTrader: (1)

Oh yeah, thats something I forgot to add, I'm not spinning. At all.

jaberwaki

ok first off, you cant "smell" a lean condition, if you have a gas smell it means you are running rich. a rich condition can account for some of your woes(like leaving softer off the line)
but your top end is being lost in your muffler choice the 80 series flowmaster flows worse then stock in most cases and would choke you up badly in the higher rpms. , the cures.
first keep the cat back, flowmasters sound great,however install a cutout so when you roll to the track you can unleash the real power(i seen 17 rwhp picked up over flowmaster just uncapping the cutout)
next you will only know how far off your tune is if you run it on a wide band to see where your a/f is at. dial it in to around 13/1 ish and go get you 12 sec run...oh yeh and you need a stall verter your 60's are ***

BlackTA

iTrader: (1)

Finally some real help. So you really think that the muffler would set me back ?

Also, I've always heard that the smell means you're running lean, but whatever, either way I need to get it tuned.

Finally, I'm in the process of buying a 4000 stall converter from a fellow member of this board, and I've got 3.73s waiting for installation.

jaberwaki

THAT muffler... yes... it really would hold you back. 17 rwhp is about .15-.2 in the 1/4
you could find another 10-20 in tuning.
that with a 4000 stall and 3.73's....
i would be surprized if you did not see mid 12's...

BlueSix

If you can smell gas, that means that there is "too much" of it, which means you are running rich.
Second, if you are cutting 2.0's, you are spinning.
Were all the runs at the same track? what is the elevation? Get a verter, and a tune. Also, if your car is a 3.23 gear car don't waste your money on the 3.73's, they are weaker and you would be lucky to see more than a theth diference between them and the 3.23's on a stalled car. Oh yeah, get some ET streets as soon as you get that 4K stall.

BlackTA

iTrader: (1)

I didn't say I smelled gas...but something...i dunno. Like I said, either way I need tuning.
Fortunately (kinda), I currently have the 2.73 rear end, so putting on the 3.73s should be a drastic difference, plus with the converter...looking forward to that.

98boxer

iTrader: (7)

I had a flowmaster and although it sounded really good, I definately notice a little power lose. Lose the flowmaster.

LiquidFire350

iTrader: (8)

ive heard flowmaster isnt all that great, but i wasnt expecting it to be that bad, i have LM, ive read on here that when i get LTs that i should cut out the resonator and weld in a dynomax race muffler..... any thoughts?

BlackTA

iTrader: (1)

Definitely, that's why I swapped the flowmaster cat back on, I had LM when I first put on my Long Tubes.

Sounded like so much ***, but some people here like it.

jaberwaki

this is a popular mod referd to as a dynomouth.
do a search on that and you will find alot of opinions on it...(mostly good)

LiquidFire350

iTrader: (8)

ok, cops have been hastleing me lately about the car being loud, so i was thinking about swapping for a flowmaster, but if its not worth it. any idea if welding in the dynomax will make it louder, or just sound better?

jaberwaki

the dyno muffler will quiet down the exhast alittle, not sacrifice much(if any) hp and get rid of most of the rasp... check out www.ls1sounds.com for clips and sound files...

longdaddy

Do you have cats? Bad cat will cause exhaust to smell funny (but not like rich smell) and may even screw your front O2 readings/AF.

DóòD

Forget a new muffler...
Go with a dump!
I have Mac Mid headers, OYP and a STOCK CATBACK.. Oh..and no cat..
I still dig the look of stock.. It innocent looking..

Just flip the swtich..
I go from a pretty quite stock sound. to NASCAR