I know why my times sucked! - NJFBOA - Home of New Jersey's Camaros and Firebirds

MattysTA · 08-16-2008, 04:08 PM

Well it took me a bit to realize this DOH! but when i bought the car i had to get it through inspection but the engine light was on and i was getting codes for my catalyst 02 sensors(threw my sims on from my old car to get her through and forgot about it). so needless to say my cats are clogging and im losing alot of power, which in turn makes total sense that my front 02 readings were between 8-900 mv's at idle and going as low as.045 under WOT and that would be because the cat is holding back so much backpressure its screwing with the readings. stay tuned for my new times once i get the dealer to replace them this week

deadtrend1 · 08-16-2008, 08:44 PM

eh, if you already have simms, just take a broomstick to the cats.

Disclaimer: Doing that will violate current emission laws so in no way do I condone this ......

MattysTA · 08-16-2008, 08:58 PM

Quote:

Originally Posted by deadtrend1

eh, if you already have simms, just take a broomstick to the cats.

Disclaimer: Doing that will violate current emission laws so in no way do I condone this ......

lol yeah i was going to do that but i decided to just let the dealer replace them. besides im in the process of getting a new y-pipe for my lt's that are waiting to go in. and if i ever want to put it back to stock for whatever reason itll have low mile factory cats...

Mike · 08-16-2008, 10:57 PM

ehhh the times from your second post arent that bad given the time of year and 60'........im sure they will help but probably not that signifigantly

MattysTA · 08-17-2008, 07:20 AM

that time was the first run of the night,2nd trip to the track. 3 runs after that it went down to 14.1-14.2. went back to the track again fri and same thing14.1-14.2 2.1 60 ft. so how do i go from a 13.8 to a 14.2 when all i lost in the 60ft was a tenth?( ive read other guys pulling 2.1's that are doing low 13's) these cats are gonna make a big difference. i'll put up my new times this coming weekend once this problem is fixed

GP99GT · 08-17-2008, 10:28 AM

which O2's did you put the simulators on? the ones before the cat?

MattysTA · 08-17-2008, 11:20 AM

Quote:

Originally Posted by GP99GT

which O2's did you put the simulators on? the ones before the cat?

umm yeah why was i not supposed to? LOL of course i put them after the cats.....

deadtrend1 · 08-17-2008, 12:34 PM

don't think the connector would work on the front ones anyways

MattysTA · 08-17-2008, 12:43 PM

Quote:

Originally Posted by deadtrend1

don't think the connector would work on the front ones anyways

you are correct fronts are flat connector, rears are square..

DevilDougWS6 · 08-17-2008, 01:21 PM

Quote:

Originally Posted by MattysTA

you are correct fronts are flat connector, rears are square..

not to hijack but where in TR are you? i think i saw you on 37 last night. we should meet up and hang out sometime!

MattysTA · 08-17-2008, 01:44 PM

Quote:

Originally Posted by DevilDougWS6

not to hijack but where in TR are you? i think i saw you on 37 last night. we should meet up and hang out sometime!

Yup i was out there, i was also at kmart, you must have been the nbm i saw there when everyone got kicked out.... i live at the border of Tr/Manchester....

GP99GT · 08-17-2008, 05:02 PM

nevermind, i read it wrong. i thought you were saying the rear O2s were screwing up the reading.

Mike · 08-17-2008, 10:59 PM

if your cats are messed up enough to slow the car down, you would notice in other driving than just the timeslip

MattysTA · 08-18-2008, 01:13 PM

Quote:

Originally Posted by cbrrmike

if your cats are messed up enough to slow the car down, you would notice in other driving than just the timeslip

well i would if the car was fine when i bought it but it wasnt. it was falling on its face constantly untill i cleaned the maf. then it was much better but it still doesnt pull as hard as it should be...

SuperSweet · 08-20-2008, 09:41 AM

what was your MPH. I went 13.2 at 106 with a 2.1 60' bone stock. I would have to agree that the cats would be holding you back with that kind of time

Mike · 08-20-2008, 10:07 AM

whatever makes you feel better

MattysTA · 08-20-2008, 11:35 AM

ill feel better when the car is doing what it should for now im troubleshooting not making excuses. like yesterday i did some testing with a lazer temp gun and heres my results...
the temp at the manifolds was around 280 and the cats were 260 well after the cats the pipe going into the y pipe 3 inches after the cat was only 200 degrees, how is it possible to lose 60 degress within 3 inches? its not unless there is a clog, also i checked the intermediate pipe going into the muffler and it was 150 yet the outlet pipe right next to it was only 130 again how can pipes that are less than 3 inches aprt lose 20 degrees between them? so that leads me to believe there is also some kind of clog in the muffler....

MattysTA · 08-20-2008, 11:49 AM

Quote:

Originally Posted by SuperSweet

what was your MPH. I went 13.2 at 106 with a 2.1 60' bone stock. I would have to agree that the cats would be holding you back with that kind of time

13.8@101 was the best and now no better than 14.1-14.2 @98 mph

SuperSweet · 08-20-2008, 12:11 PM

stick/auto? either way there is a problem. try a pass after the cats and see what happens. you might want to change those front O2's as well for the sake of things.

MattysTA · 08-20-2008, 12:20 PM

Quote:

Originally Posted by SuperSweet

stick/auto? either way there is a problem. try a pass after the cats and see what happens. you might want to change those front O2's as well for the sake of things.

its auto and im def going to change the 02's because they are reading 8-900 mv's at idle and going down to .050 at wot which is ass backwards

JL8Jeff · 08-20-2008, 12:45 PM

It might not be the cats as much as the O2's are giving bad readings which screw up the computer mixture. The factory cats are made to heat up as much as possible to burn off emission's so the temps don't really tell you too much. That being said, one of my factory cats smelled funny from the day I got the car with 33K miles on it so I'm sure there was some buildup in there. The PCV setup on the LS1 allows the engine to suck in oil and that will cause buildup everywhere which will throw things off over time. I'd try the O2's first and if that doesn't make a difference, then go after the cats or install headers.

MattysTA · 08-20-2008, 03:36 PM

Quote:

Originally Posted by JL8Jeff

It might not be the cats as much as the O2's are giving bad readings which screw up the computer mixture. The factory cats are made to heat up as much as possible to burn off emission's so the temps don't really tell you too much. That being said, one of my factory cats smelled funny from the day I got the car with 33K miles on it so I'm sure there was some buildup in there. The PCV setup on the LS1 allows the engine to suck in oil and that will cause buildup everywhere which will throw things off over time. I'd try the O2's first and if that doesn't make a difference, then go after the cats or install headers.

true its possible but i even ran the car locked in open loop taking the front 02's out of the equation and still no difference... i have headers and im waiting for the new ypipe to get here but i want to see the car go the best it can now before i start doing anything major so i have a real baseline to start with .

ins0mnia24 · 08-20-2008, 03:48 PM

what are you using and how are you reading the mV's on your O2's because they don't stay at any specific mV except when you 1st turn the key on then they send a predetermined amount until you are out of open loop..

MattysTA · 08-20-2008, 03:56 PM

Quote:

Originally Posted by ins0mnia24

what are you using and how are you reading the mV's on your O2's because they don't stay at any specific mV except when you 1st turn the key on then they send a predetermined amount until you are out of open loop..

yes i know the mv's are supposed to fluctuate at idle and they do i mean at cruising that they are staying closer to the above numbers.... i have efilive...

yes the predetermined amount is from the back up ve table...then they run off the 02's CL which like i said above i locked it in OL so it would run off the back up ve table instead of the 02's.

ins0mnia24 · 08-20-2008, 04:18 PM

Yeh you would be able to see just by how fast the mV readings take place to judge if you are getting lazy readings from the O2's..
And then even if no dash light you would still have a Dtc until it got bad enough to set the dash light off..

You probably have some tuning issue's
Other than that since you have Efi live I would ditch the sim's and cats then..