C6 A6 Dyno Pull
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
C6 A6 Dyno Pull
I'm getting ready to put on some headers this weekend and I wanted a baseline pull. This is a stock C6 with the A6 tranny except it does have a K&N Aircharger inlet. The pulls were done in 4th gear (1.15 ratio).
It was really a hot one today in Phoenix. The first run made 334 hp. The second run it made 316 hp. This has been proven again and again, the LS2 really pulls back timing when it gets warm. The first graph was very smooth, but the second you could see a step down at about 3200 rpm where it pulled out the timing and the line dropped straight down and then followed below the first graph.
So, 334 is pretty typical of an A6, but it sure doesn't look like the K&N really bought me a lot. I would have done back to backs with the stock inlet, but you can see I would have had to wait an hour between runs. At 82% efficiency for an auto with an unlocked converter, puts me at 407 which is also pretty typical for flywheel.
I'll do another pull next week and report back for the header gains. I may also put the stock inlet back on if I have time for cooldowns and see what the K&N really does buy you.
Thanks,
Glenn
It was really a hot one today in Phoenix. The first run made 334 hp. The second run it made 316 hp. This has been proven again and again, the LS2 really pulls back timing when it gets warm. The first graph was very smooth, but the second you could see a step down at about 3200 rpm where it pulled out the timing and the line dropped straight down and then followed below the first graph.
So, 334 is pretty typical of an A6, but it sure doesn't look like the K&N really bought me a lot. I would have done back to backs with the stock inlet, but you can see I would have had to wait an hour between runs. At 82% efficiency for an auto with an unlocked converter, puts me at 407 which is also pretty typical for flywheel.
I'll do another pull next week and report back for the header gains. I may also put the stock inlet back on if I have time for cooldowns and see what the K&N really does buy you.
Thanks,
Glenn
Tech Member
Joined: Dec 2005
Posts: 80
Likes: 0
From: Claremont CA
[QUOTE=glennhl]I'm getting ready to put on some headers this weekend and I wanted a baseline pull. This is a stock C6 with the A6 tranny except it does have a K&N Aircharger inlet. The pulls were done in 4th gear (1.15 ratio).
Why in 4th? 3rd is 1:1 and besides what what was the MPH @ redline?
In this gear on an eddy-current dyno would take forever to make the sweep if trying to get data from 3,000rpm, have you tracked this car? If so, did you ever get it into 4th?
Regards,
Scott
Why in 4th? 3rd is 1:1 and besides what what was the MPH @ redline?
In this gear on an eddy-current dyno would take forever to make the sweep if trying to get data from 3,000rpm, have you tracked this car? If so, did you ever get it into 4th?
Regards,
Scott
Burning Brakes
Joined: Sep 2005
Posts: 1,125
Likes: 1
From: Howell N.J
[QUOTE=SBTuner]
There is no 1:1 in the A6, this is the six speed auto.
Originally Posted by glennhl
I'm getting ready to put on some headers this weekend and I wanted a baseline pull. This is a stock C6 with the A6 tranny except it does have a K&N Aircharger inlet. The pulls were done in 4th gear (1.15 ratio).
Why in 4th? 3rd is 1:1 and besides what what was the MPH @ redline?
In this gear on an eddy-current dyno would take forever to make the sweep if trying to get data from 3,000rpm, have you tracked this car? If so, did you ever get it into 4th?
Regards,
Scott
Why in 4th? 3rd is 1:1 and besides what what was the MPH @ redline?
In this gear on an eddy-current dyno would take forever to make the sweep if trying to get data from 3,000rpm, have you tracked this car? If so, did you ever get it into 4th?
Regards,
Scott
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
[QUOTE=SBTuner]
Scott,
This is an A6, not the A4. The A6 is 1.53 in 3rd gear and 1.15 in 4th gear. 5th and 6th are overdrives. So running in the paddle mode in 4th gives you an overall 2.94 ratio and you take the dyno up to about 170 mph.
I have tracked it, ran on a very warm night here in Phoenix at 13.14 at 109.33 mph. I ran through the lights in 3rd gear. Third is a pretty good gear, much better than the 1.00 3rd with the A4. Third is 1.53 times the rear end ratio of 2.56 gives an overall of 3.92. So the A6 would be like an A4 with a 3.90 rear end.
Originally Posted by glennhl
I'm getting ready to put on some headers this weekend and I wanted a baseline pull. This is a stock C6 with the A6 tranny except it does have a K&N Aircharger inlet. The pulls were done in 4th gear (1.15 ratio).
Why in 4th? 3rd is 1:1 and besides what what was the MPH @ redline?
In this gear on an eddy-current dyno would take forever to make the sweep if trying to get data from 3,000rpm, have you tracked this car? If so, did you ever get it into 4th?
Regards,
Scott
Why in 4th? 3rd is 1:1 and besides what what was the MPH @ redline?
In this gear on an eddy-current dyno would take forever to make the sweep if trying to get data from 3,000rpm, have you tracked this car? If so, did you ever get it into 4th?
Regards,
Scott
This is an A6, not the A4. The A6 is 1.53 in 3rd gear and 1.15 in 4th gear. 5th and 6th are overdrives. So running in the paddle mode in 4th gives you an overall 2.94 ratio and you take the dyno up to about 170 mph.
I have tracked it, ran on a very warm night here in Phoenix at 13.14 at 109.33 mph. I ran through the lights in 3rd gear. Third is a pretty good gear, much better than the 1.00 3rd with the A4. Third is 1.53 times the rear end ratio of 2.56 gives an overall of 3.92. So the A6 would be like an A4 with a 3.90 rear end.
Racer
Joined: Oct 2005
Posts: 362
Likes: 0
From: Corona California
Originally Posted by glennhl
I'm getting ready to put on some headers this weekend and I wanted a baseline pull. This is a stock C6 with the A6 tranny except it does have a K&N Aircharger inlet. The pulls were done in 4th gear (1.15 ratio).
It was really a hot one today in Phoenix. The first run made 334 hp. The second run it made 316 hp. This has been proven again and again, the LS2 really pulls back timing when it gets warm. The first graph was very smooth, but the second you could see a step down at about 3200 rpm where it pulled out the timing and the line dropped straight down and then followed below the first graph.
So, 334 is pretty typical of an A6, but it sure doesn't look like the K&N really bought me a lot. I would have done back to backs with the stock inlet, but you can see I would have had to wait an hour between runs. At 82% efficiency for an auto with an unlocked converter, puts me at 407 which is also pretty typical for flywheel.
I'll do another pull next week and report back for the header gains. I may also put the stock inlet back on if I have time for cooldowns and see what the K&N really does buy you.
Thanks,
Glenn
It was really a hot one today in Phoenix. The first run made 334 hp. The second run it made 316 hp. This has been proven again and again, the LS2 really pulls back timing when it gets warm. The first graph was very smooth, but the second you could see a step down at about 3200 rpm where it pulled out the timing and the line dropped straight down and then followed below the first graph.
So, 334 is pretty typical of an A6, but it sure doesn't look like the K&N really bought me a lot. I would have done back to backs with the stock inlet, but you can see I would have had to wait an hour between runs. At 82% efficiency for an auto with an unlocked converter, puts me at 407 which is also pretty typical for flywheel.
I'll do another pull next week and report back for the header gains. I may also put the stock inlet back on if I have time for cooldowns and see what the K&N really does buy you.
Thanks,
Glenn
my 05' a4 z51 pulled the same 334 rwhp with a callway intake, then 358rwhp with a tune from A&A! So your numbers are in line!
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by Z512GO
my 05' a4 z51 pulled the same 334 rwhp with a callway intake, then 358rwhp with a tune from A&A! So your numbers are in line!
Also, what were your Air to Fuel ratios before your tune? I was disappointed that mine seem to be pretty close to 13 to 1. That tells me I may not be able to pick up a lot with a tune.
My goal is 360 with headers and a tune, then it will be faster than my old 01 Z28 that had headers and a 224 cam.
Thanks,
Glenn
Race Director
Joined: Apr 2005
Posts: 10,436
Likes: 4
From: Everett Wa
Actually for me the 3rd pull was the best as far as collected good data. Biggest reason was trying to find the right gear. 337/340 where the numbers so I would say you are right there. I personnally think the biggest gains we are going to see is with a tune though there is no doubt that headers will help even the stock intake breath. My airfuel was at 12.5 or lower from 3500rpm's up.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
I just went back and looked at my first and best run again. I actually had a dip in torque/hp at 3700 rpm. Looks like I got some timing pullback on the first run, probably shouldn't have tried this with 109 degrees in the dyno area. Looks like it probably only cost me 3 hp or so.
My air fuel ran between 12.7 to 13.2 from 3000 rpm up to 6300 rpm, so it doesn't look too bad.
My air fuel ran between 12.7 to 13.2 from 3000 rpm up to 6300 rpm, so it doesn't look too bad.
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Race Director
Joined: Apr 2005
Posts: 10,436
Likes: 4
From: Everett Wa
Better than mine it went all the way down to 11.4. at 5000-5500rpm and was 11.7 at peak hp. Cosidering that it should be running about 14:1 at WOT. I think there is some power to be had there. God I can't wait until we have a tune available. Yes I know that the engine can be tuned but until I can also change the shift points why spend the money.
Tech Member
Joined: Dec 2005
Posts: 80
Likes: 0
From: Claremont CA
[QUOTE=glennhl]
Scott,
This is an A6, not the A4. The A6 is 1.53 in 3rd gear and 1.15 in 4th gear. 5th and 6th are overdrives. So running in the paddle mode in 4th gives you an overall 2.94 ratio and you take the dyno up to about 170 mph.
I have tracked it, ran on a very warm night here in Phoenix at 13.14 at 109.33 mph. I ran through the lights in 3rd gear. Third is a pretty good gear, much better than the 1.00 3rd with the A4. Third is 1.53 times the rear end ratio of 2.56 gives an overall of 3.92. So the A6 would be like an A4 with a 3.90 rear end.
Ok thanks, I am not familiar with the A6 and just assumed it was the A4 (although you wrote A6)
I would still want to make the pull in 3rd since the rate of accel would be more in line. I see that the ambient temp was >100f. At around 90-95f IAT spark compensation begins. In the dyno cell you may experience much higher temps as the runs add to the ambient. Making sure that the IAT is very near ambient and the same from run to run is really the only way to make sure that your data is comparative.
Regards,
Originally Posted by SBTuner
Scott,
This is an A6, not the A4. The A6 is 1.53 in 3rd gear and 1.15 in 4th gear. 5th and 6th are overdrives. So running in the paddle mode in 4th gives you an overall 2.94 ratio and you take the dyno up to about 170 mph.
I have tracked it, ran on a very warm night here in Phoenix at 13.14 at 109.33 mph. I ran through the lights in 3rd gear. Third is a pretty good gear, much better than the 1.00 3rd with the A4. Third is 1.53 times the rear end ratio of 2.56 gives an overall of 3.92. So the A6 would be like an A4 with a 3.90 rear end.
I would still want to make the pull in 3rd since the rate of accel would be more in line. I see that the ambient temp was >100f. At around 90-95f IAT spark compensation begins. In the dyno cell you may experience much higher temps as the runs add to the ambient. Making sure that the IAT is very near ambient and the same from run to run is really the only way to make sure that your data is comparative.
Regards,
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
[QUOTE=SBTuner]
Ok thanks, I am not familiar with the A6 and just assumed it was the A4 (although you wrote A6)
I would still want to make the pull in 3rd since the rate of accel would be more in line. I see that the ambient temp was >100f. At around 90-95f IAT spark compensation begins. In the dyno cell you may experience much higher temps as the runs add to the ambient. Making sure that the IAT is very near ambient and the same from run to run is really the only way to make sure that your data is comparative.
Regards,
You are right, the ambient was around 104 and the dyno listed 109. As far as third gear, the dyno takes into account which gear you are in by measuring the engine speed and the wheel speed at the same time. So it doesn't matter if you spin it up in 3rd or 4th. The reason people are choosing 4th is the gear mesh at 1.15 ratio should be slightly more efficient than the 1.53 third gear mesh. Doubt it would make much difference, but third should dyno a little less.
Originally Posted by glennhl
Ok thanks, I am not familiar with the A6 and just assumed it was the A4 (although you wrote A6)
I would still want to make the pull in 3rd since the rate of accel would be more in line. I see that the ambient temp was >100f. At around 90-95f IAT spark compensation begins. In the dyno cell you may experience much higher temps as the runs add to the ambient. Making sure that the IAT is very near ambient and the same from run to run is really the only way to make sure that your data is comparative.
Regards,
Intermediate
Joined: Apr 2006
Posts: 42
Likes: 0
From: Sacramento California
about 334 being typical, i have a completly stock A6 and did a baseline last week at svs rnd in sacramento. after three runs i got 355, 350, and 345. i'm saying this because the difference of 21 is significant when comparing two near identical cars and i was wondering if my numbers were off.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by fongfuthrowing
about 334 being typical, i have a completly stock A6 and did a baseline last week at svs rnd in sacramento. after three runs i got 355, 350, and 345. i'm saying this because the difference of 21 is significant when comparing two near identical cars and i was wondering if my numbers were off.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by fongfuthrowing
about 334 being typical, i have a completly stock A6 and did a baseline last week at svs rnd in sacramento. after three runs i got 355, 350, and 345. i'm saying this because the difference of 21 is significant when comparing two near identical cars and i was wondering if my numbers were off.
Thread Starter
Le Mans Master
Joined: Feb 2006
Posts: 5,762
Likes: 4
From: Chandler Arizona
Originally Posted by fongfuthrowing
these are the corrected numbers and i have yet to take it to the track but hope to soon.
