2000WS6Vert

My car had just a lid and Hooker LTs and ORY and I ran 13.1@107.5 all day long. On Monday my friend and I installed an LS6 intake. While installing it, we removed the EGR and AIR system. I don't have an editor yet, so I have an SES light. I checked the codes with a scanner and it said the EGR was missing as was the air system. I also got a code about an 02 sensor but I've had that ever since I got the headers installled ( I don't think the PCM likes my eliminators).

So last night I went to the track. Every single run was a 13.4 @ 104. How could this be?? I expected the car to actually run faster...not slower. I'm guessing that maybe the car was just hot because I drove 70 miles to get there and had the car turned off for only a few minutes b/t runs because there was nobody there last night. But....in the past I've run faster under the very same conditions.

What could possibly contribute to the car being slower now? Does the PCM require longer than a couple days to learn the intake or what?

Keenov

iTrader: (5)

How was the weather last night? Did you give the car a few miles before heading to the track to try and learn the extra flow? If it was installed correctly, I don't see how losing ET/MPH is possible, unless you have a bad fuel injector or sparkplug.

jimmyblue

iTrader: (11)

I suspect the O2 code indicates you have poor
mixture feedback, probably giving you + fuel trims
as a reaction to false-lean O2 readings (sleepy
sensor puts out low voltage, just like lean mix).
Then the + fuel trim "residue" sticks with you when
you pop to WOT and you go down the track with
that much extra lard in your ***.

Next time you're at the track look for a GM car laptop
geek and see if one of them will hook up and pull
a log on one pass for you.

SouthFL.02.SS

An intake swap may need tuning.

whitecamaross

your a/f is probably off. ls6 indeed needs tuning. i found out myself with the tuner here in florida that without anything done to the car the intake wont help you.

2000WS6Vert

I can understand that the intake may not 'help' but should it hurt? By the appearance of things....I'm missing 30 hp (3 tenths and 3 mph).

I've seen several threads where they swap intakes b/t dyno runs without tuning and they gain HP with the newer intake. Well, I swapped and drove 100 miles and managed to lose power.

I just don't get it. I guess it's time to save up for a HPTuner.

SouthFL.02.SS

Hey, there's about a 3 thenths difference at Moroso between Summer and Winter runs.
This weekend will be our first taste of cool weather (70's at night- woohoo!)....hehe.

Edit: check for any leaks.

gettinthere

iTrader: (3)

Welcome to my world. Stock I went 13.3. Now, I can only run a 14.12 @109 spinning real hard. Oh well, heads, cam, rear end and ET Streets are coming over the winter.

JL ws-6

iTrader: (50)

I feel you're pain. I gained 50 HP and tq from my mods from stock, and I ran the same times with the street tires.... but the 60 went from 2.1's to 2.4's, so I at least know where the problem is.. traction. So I add slicks, and haze the stock clutch You definately need to retune anytime anything is done to the intake/exhaust, these cars are real sensative to any changes, at least mine is. Dyno that car, and I bet that you see a lean condition. Also, when you have the car tuned, get rid of the rear simm's, and just turn off the rear o2's completely, probably better off that way, as well as the egr and air.

SouthFL.02.SS

Any difference in 60' times between the ls1 and ls6 intake runs?
Were you hooking up better before?

whitecamaross

i gained 30rwhp and 37ft/lbs of tq after the asp crank pulley, intake and true dual exhaust with a dyno tune. i was running a lean condition of 14.5. get it tuned and try again.

black_z

iTrader: (4)

Definitely need a tune, there was probably a difference in DA too.

LS1LT1

iTrader: (16)

DA, temps and even track prep. Fuel quality (and fuel level) can also be a potential factor.
Try again on a much cooler night and lower the rear tire pressure a little more maybe and see.

2000WS6Vert

I ran a 2.01 60' foot time.....actually a better time than my 2.1 60' on my last 13.1@107.5 mph earlier in the year. You would think a better 60' time would net a faster run...........ummm...NOPE!

I used to run 86 in the 1/8th now it was 83 or 84. I can notice a the loss power when I hit third.

If I knew that I would need a tune and I would LOSE power with the LS6 intake....I would have just waited to install it after I purchase a HPTuner.
This sucks!

Keenov

iTrader: (5)

How is your clutch holding up? I cut 2 tenths off of my 60' with nitto's and the stock clutch and I ran a slower ET. Clutch was slipping.

2.1 60' = 13.52 @ 104.85 mph

1.9 60' = 13.58 @ 103.2 mph (Ran a similar time with the other 1.9 60' that night)

I just switched to a spec stage 3. We will see how that holds up

nikon1999

iTrader: (22)

taking the egr and air off without deleting them will make the car run funky at wot and any hard throttle passes really

2000WS6Vert

That's not what I read on here. I researched the AIR and EGR before removing them and the consensus of what I found said there would be no impact on performance.

Think about it...how could the AIR system impact performance at all??? The EGR I can understand a little since it used to put dirty air back into the intake, however, now there isn't dirty air in the intake.

I'm sure I can fix all my problems as soon as $500 magically appears in my bank account.

Oh...by the way...my car is an A4...no clutch here!

black_knight

iTrader: (1)

WHOA! Hold the phone! I've read up on EGR and AIR and I've never heard of that! Are you sure?!?

Keenov

iTrader: (5)

Forgot to read the sig, sorry about that

SSTYCOON

iTrader: (2)

reset the pcm, sometimes it takes a few hundred miles to relearn the fuel curves and get that SES light to turn off