First tune
Thread Starter
Instructor
Joined: Oct 2022
Posts: 131
Likes: 7
First tune
Hello
I have recently installed LG Pro 1 3/4 lt catless headers with 3" X-pipe and 3" tubing w/o back boxes to my 06 A6 LS2.
I have 1.5 weeks until I get it tuned, I'm driving it but not going over 3-3.5k rpm.
Other than that it's fully stock.
While being there what should I ask for in addition? I have to get the rear O2s turned off, tune, and a friend said I should ask them to set the vent to start a bit earlier at a lower temp.
Btw what results should I expect from the dyno after the tune with premium fuel?
I have recently installed LG Pro 1 3/4 lt catless headers with 3" X-pipe and 3" tubing w/o back boxes to my 06 A6 LS2.
I have 1.5 weeks until I get it tuned, I'm driving it but not going over 3-3.5k rpm.
Other than that it's fully stock.
While being there what should I ask for in addition? I have to get the rear O2s turned off, tune, and a friend said I should ask them to set the vent to start a bit earlier at a lower temp.
Btw what results should I expect from the dyno after the tune with premium fuel?
Melting Slicks
Joined: Oct 2022
Posts: 3,341
Likes: 1,934
From: Ulta Vista, AZ
Why are you not going over 3k?
Exhaust is irrelevant to a tune. No need to drive the car gingerly.
Nothing special is going to happen in the tune. It’s just going to be a basic leaning out the factory rich maps, adding a splash of timing, turning off o2’s if you are lucky and maybe skip shift removed.
Exhaust is irrelevant to a tune. No need to drive the car gingerly.
Nothing special is going to happen in the tune. It’s just going to be a basic leaning out the factory rich maps, adding a splash of timing, turning off o2’s if you are lucky and maybe skip shift removed.
Thread Starter
Instructor
Joined: Oct 2022
Posts: 131
Likes: 7
Why are you not going over 3k?
Exhaust is irrelevant to a tune. No need to drive the car gingerly.
Nothing special is going to happen in the tune. It’s just going to be a basic leaning out the factory rich maps, adding a splash of timing, turning off o2’s if you are lucky and maybe skip shift removed.
Exhaust is irrelevant to a tune. No need to drive the car gingerly.
Nothing special is going to happen in the tune. It’s just going to be a basic leaning out the factory rich maps, adding a splash of timing, turning off o2’s if you are lucky and maybe skip shift removed.
Melting Slicks
Joined: Oct 2022
Posts: 3,341
Likes: 1,934
From: Ulta Vista, AZ
Exhausts have absolutely nothing to do with the tunes.
You are fine. Enjoy it!
Drifting
Joined: May 2019
Posts: 1,752
Likes: 676
From: Lakeland, Florida
The tuner can also set the engine fans to kick on a little sooner than the factory tune. Mine did and i have zero issues here in central Florida sitting at a traffic light with outside temperatures 95.
Melting Slicks
Joined: Oct 2022
Posts: 3,341
Likes: 1,934
From: Ulta Vista, AZ
Exhaust does not make your car run lean or rich or anything between. Nor do cats or lack there of.
Tunes change due to incoming air and sampling changes, and fueling basically.
Burning Brakes
Joined: Oct 2015
Posts: 820
Likes: 332
From: Orlando Florida
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Melting Slicks
Joined: Oct 2022
Posts: 3,341
Likes: 1,934
From: Ulta Vista, AZ
Are you trying to suggest that a free flowing exhaust will have no impact on the AFR compared to a restrictive exhaust, for example headers, no cats, 3" dual pipes, versus stock exhaust manifolds and 1" single exhaust? After I installed LTs and high flow cats with a wideband O2 sensor my AFR at WOT definitely leaned out, which is why I altered my PE tables to add more fuel with HP Tuners Pro.
The car has no clue what happens after the sensors. If the incoming air is not changing or the fuel or timing is not changing, your tune is not changing.
The only exception to this is with a turbocharged car and that is only because boost levels typically change when uncorking the exhaust hence cars sometimes running leaner.
So you tune and you are sticking by this as an answer?
How does more air OUT equal more fuel being commanded?
I keep widebands in all my modded cars over the years. I have never seen a car go lean from installing an exhaust.
What car is going from stock exhaust manifolds and a 1” exhaust to dual 3” pipes and headers for your example? That example seems far fetched
Burning Brakes
Joined: Oct 2015
Posts: 820
Likes: 332
From: Orlando Florida
ZERO!
The car has no clue what happens after the sensors. If the incoming air is not changing or the fuel or timing is not changing, your tune is not changing.
The only exception to this is with a turbocharged car and that is only because boost levels typically change when uncorking the exhaust hence cars sometimes running leaner.
So you tune and you are sticking by this as an answer?
How does more air OUT equal more fuel being commanded?
I keep widebands in all my modded cars over the years. I have never seen a car go lean from installing an exhaust.
What car is going from stock exhaust manifolds and a 1” exhaust to dual 3” pipes and headers for your example? That example seems far fetched
The car has no clue what happens after the sensors. If the incoming air is not changing or the fuel or timing is not changing, your tune is not changing.
The only exception to this is with a turbocharged car and that is only because boost levels typically change when uncorking the exhaust hence cars sometimes running leaner.
So you tune and you are sticking by this as an answer?
How does more air OUT equal more fuel being commanded?
I keep widebands in all my modded cars over the years. I have never seen a car go lean from installing an exhaust.
What car is going from stock exhaust manifolds and a 1” exhaust to dual 3” pipes and headers for your example? That example seems far fetched
Melting Slicks
Joined: Oct 2022
Posts: 3,341
Likes: 1,934
From: Ulta Vista, AZ
all good, sorry if it came off that way.
I am no tuner, so take worth a grain of salt. That being said I have tuned my own cars to an extent and have watched values on datalogs and widebands over the years and dealt with a lot of tuners.
The only time I have ever noticed afrs change from exhaust was always boost related (ie: boost raised once opening the exhaust)
Burning Brakes
Joined: Oct 2015
Posts: 820
Likes: 332
From: Orlando Florida