26HP from Headers
Burning Brakes
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From: Boca Raton, FL
Ernie uses a Mustang Dyno. It is probably a good part of the reason his numbers are a little lower. Also, something that always seems to get overlooked. Cars make less power here than in the most of the country. It is over 90 degrees right now and the humidity could be cut with a knife. 320 RWHP here, right now, is probably 340 RWHP up north.
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From: Just trying to make it through each day.
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St. Jude Donor '03-'04
Originally Posted by bpproducts
Adam like you said the autos always read less. It seams that everyone thinks the sticks dyno the same as the autos. Most of the C6s that you see out there that have been dynoed have been the sticks so when an auto comes up they think the numbers are way off. Lets put it this way if the autos had the same RWHP they would be quicker then the sticks down the 1/4 mile.
Ernie
www.BreathlessPerformance.com
Ernie
www.BreathlessPerformance.com
In any event.....it is still a low dyno.
Melting Slicks
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From: Los Angeles CA
Originally Posted by -Blue Vette-
A stock C6 A4 should dyno around 350 @ the wheels.
400hp - 20% loss = 320 RWHP
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From: Virginia
Cruise-In IV-V-VI-VII Veteran
St. Jude's Donor '06
Originally Posted by Adam Bruce
No, if the A4 made 350 at the wheels stock then it would be making 437 crank hp.
400hp - 20% loss = 320 RWHP
400hp - 20% loss = 320 RWHP
17% for the 3.15 and 14.5% for the 2.73 Automatics.
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Melting Slicks
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From: Fort Lauderdale Fl
At 17% 350RWHP would be about 421 Flywheel which is not what the C6 comes with.
330RWHP would be about 400 Flywheel at 17%
325RWHP would be about 400 Flywheel at 18%
Ernie
www.BreathlessPerformance.com
330RWHP would be about 400 Flywheel at 17%
325RWHP would be about 400 Flywheel at 18%
Ernie
www.BreathlessPerformance.com
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Melting Slicks
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From: Fort Lauderdale Fl
Melting Slicks
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From: Los Angeles CA
Originally Posted by Scissors
Except that the A4 doesn't have 20% loss.
17% for the 3.15 and 14.5% for the 2.73 Automatics.
17% for the 3.15 and 14.5% for the 2.73 Automatics.
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Race Director
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From: Castle Rock CO
St. Jude Donor '15
The dyno reading higher or lower has NO effect on this discussion, as long as the before and after dyno's where done on the same dyno. If so, the air intake gains are a complete lie and it is very disappointing to see on the forum. I highly doubt this dyno is significantly low, as the after numbers for both the intake and exhaust combined are in line with what respectable dyno graphs are getting with just headers.
Todd
Todd
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From: Virginia
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St. Jude's Donor '06
Originally Posted by bpproducts
At 17% 350RWHP would be about 421 Flywheel which is not what the C6 comes with.
330RWHP would be about 400 Flywheel at 17%
325RWHP would be about 400 Flywheel at 18%
Ernie
www.BreathlessPerformance.com
330RWHP would be about 400 Flywheel at 17%
325RWHP would be about 400 Flywheel at 18%
Ernie
www.BreathlessPerformance.com
Most of the dynos I've seen have been of manuals and they've been cranking out high 340s to low 350s. Which would be about 402 crank HP.
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From: Virginia
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St. Jude's Donor '06
Originally Posted by Adam Bruce
14.5%? Wow that's an efficient Automatic. GTO's get 15% loss on their 6-speed Manuals!
The drivetrain consists of a transmission and a differential, and both have an affect on the drivetrain loss. That's why the dyno is performed in 4th gear (3rd for the A4): because a 1:1 ratio is the most efficient.
Those numbers are also based on many, many dynos by C5 owners. Since the differentials are the same and the transmission is almost the same, the results should be the same as well. Or at least very, very close.
Last edited by Scissors; Sep 30, 2004 at 03:49 PM.
Race Director
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From: CA
Originally Posted by bpproducts
Well the numbers are in.
With the Vortex ram induction 349 to 353 RWHP
Ernie
www.BreathlessPerformance.com
With the Vortex ram induction 349 to 353 RWHP
Ernie
www.BreathlessPerformance.com
When you put this Vortex ram induction on, did you change anything in the engine's calibration?
Did you put the stock air cleaner back on to see if you could repeat the baseline horsepower?
Michael
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Melting Slicks
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From: Fort Lauderdale Fl
Nothing was changed in the computer and yes we did change it back 3 times to verify the results.
Ernie
www.BreathlessPerformance.com
Ernie
www.BreathlessPerformance.com
Racer
Joined: Jun 2001
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From: OKC OK
some motors are not always that great on a dyno.
my car stock only did 283 - 293 on a dynojet
but my car is a M6 1999 rated at like 350hp so maybe they got
one that just dynos bad.
either way thanks for the info
my car stock only did 283 - 293 on a dynojet
but my car is a M6 1999 rated at like 350hp so maybe they got
one that just dynos bad.
either way thanks for the info
Team Owner
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From: Houston, TX
Actually, using the 18% loss for A4's (that was considered normal for C5's), would put it at 328. So the 320 seems a little low, but not too far off.
But the horsepower gain adding the Vortex does seem awfully optimistic. I hope it is true, but will l be surprised if it is. And please understand I have no bone to pick with the Vortex - I have had one on both of my C5's.
But the horsepower gain adding the Vortex does seem awfully optimistic. I hope it is true, but will l be surprised if it is. And please understand I have no bone to pick with the Vortex - I have had one on both of my C5's.
Le Mans Master
Joined: Nov 1999
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From: Imperial Beach CA
Originally Posted by jschindler
Actually, using the 18% loss for A4's (that was considered normal for C5's), would put it at 328. So the 320 seems a little low, but not too far off.
But the horsepower gain adding the Vortex does seem awfully optimistic. I hope it is true, but will l be surprised if it is. And please understand I have no bone to pick with the Vortex - I have had one on both of my C5's.
But the horsepower gain adding the Vortex does seem awfully optimistic. I hope it is true, but will l be surprised if it is. And please understand I have no bone to pick with the Vortex - I have had one on both of my C5's.
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From: Virginia
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St. Jude's Donor '06
Originally Posted by jimman
thought everyone used 22% for auto and 15% for manual. Has anyone seen an actural engine dyno graph. Sure would like to put this percentage thing to bed.
pewtery2k's 2000 A4 Coupe with 3.15:1 rear gears resulted in a dyno of 294.4 RWHP. This is the lowest score in the performance registry for cars with stock intake and exhaust. This is a 14.7% loss--even better than the average of 17% that I've seen for such cars.
But also provided is the temperature (63.7 degrees) and the barometer (29.71 inches) at the time of the dyno.
Using an SAE correction calculator, this results in anywhere from 1% to 3.5% more HP (depending on a high or low relative humidity respectively.)
1% means that the SAE corrected number would be 291.456 and 3.5% would be 284.096 RWHP. Or, in other words, an SAE corrected drivetrain loss of anywhere from 17.65% (0% humidity) through 15.52% (100% humidity.)
Summary: This particular stock 2000 A4 Coupe w/ 3.15 had a 14.7% loss if the dyno was already SAE corrected, and anywhere from a 15.52% through a 17.65% loss if the dyno was not already SAE corrected (depending on relative humidity.)
Team Owner
Joined: Jun 2001
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From: Houston, TX
Originally Posted by Scissors
The forum's very own performance registry can help.
pewtery2k's 2000 A4 Coupe with 3.15:1 rear gears resulted in a dyno of 294.4 RWHP. This is the lowest score in the performance registry for cars with stock intake and exhaust. This is a 14.7% loss--even better than the average of 17% that I've seen for such cars.
But also provided is the temperature (63.7 degrees) and the barometer (29.71 inches) at the time of the dyno.
Using an SAE correction calculator, this results in anywhere from 1% to 3.5% more HP (depending on a high or low relative humidity respectively.)
1% means that the SAE corrected number would be 291.456 and 3.5% would be 284.096 RWHP. Or, in other words, an SAE corrected drivetrain loss of anywhere from 17.65% (0% humidity) through 15.52% (100% humidity.)
Summary: This particular stock 2000 A4 Coupe w/ 3.15 had a 14.7% loss if the dyno was already SAE corrected, and anywhere from a 15.52% through a 17.65% loss if the dyno was not already SAE corrected (depending on relative humidity.)
pewtery2k's 2000 A4 Coupe with 3.15:1 rear gears resulted in a dyno of 294.4 RWHP. This is the lowest score in the performance registry for cars with stock intake and exhaust. This is a 14.7% loss--even better than the average of 17% that I've seen for such cars.
But also provided is the temperature (63.7 degrees) and the barometer (29.71 inches) at the time of the dyno.
Using an SAE correction calculator, this results in anywhere from 1% to 3.5% more HP (depending on a high or low relative humidity respectively.)
1% means that the SAE corrected number would be 291.456 and 3.5% would be 284.096 RWHP. Or, in other words, an SAE corrected drivetrain loss of anywhere from 17.65% (0% humidity) through 15.52% (100% humidity.)
Summary: This particular stock 2000 A4 Coupe w/ 3.15 had a 14.7% loss if the dyno was already SAE corrected, and anywhere from a 15.52% through a 17.65% loss if the dyno was not already SAE corrected (depending on relative humidity.)
Le Mans Master
Joined: Nov 1999
Posts: 7,695
Likes: 51
From: Imperial Beach CA
Originally Posted by Scissors
The forum's very own performance registry can help.
pewtery2k's 2000 A4 Coupe with 3.15:1 rear gears resulted in a dyno of 294.4 RWHP. This is the lowest score in the performance registry for cars with stock intake and exhaust. This is a 14.7% loss--even better than the average of 17% that I've seen for such cars.
But also provided is the temperature (63.7 degrees) and the barometer (29.71 inches) at the time of the dyno.
Using an SAE correction calculator, this results in anywhere from 1% to 3.5% more HP (depending on a high or low relative humidity respectively.)
1% means that the SAE corrected number would be 291.456 and 3.5% would be 284.096 RWHP. Or, in other words, an SAE corrected drivetrain loss of anywhere from 17.65% (0% humidity) through 15.52% (100% humidity.)
Summary: This particular stock 2000 A4 Coupe w/ 3.15 had a 14.7% loss if the dyno was already SAE corrected, and anywhere from a 15.52% through a 17.65% loss if the dyno was not already SAE corrected (depending on relative humidity.)
pewtery2k's 2000 A4 Coupe with 3.15:1 rear gears resulted in a dyno of 294.4 RWHP. This is the lowest score in the performance registry for cars with stock intake and exhaust. This is a 14.7% loss--even better than the average of 17% that I've seen for such cars.
But also provided is the temperature (63.7 degrees) and the barometer (29.71 inches) at the time of the dyno.
Using an SAE correction calculator, this results in anywhere from 1% to 3.5% more HP (depending on a high or low relative humidity respectively.)
1% means that the SAE corrected number would be 291.456 and 3.5% would be 284.096 RWHP. Or, in other words, an SAE corrected drivetrain loss of anywhere from 17.65% (0% humidity) through 15.52% (100% humidity.)
Summary: This particular stock 2000 A4 Coupe w/ 3.15 had a 14.7% loss if the dyno was already SAE corrected, and anywhere from a 15.52% through a 17.65% loss if the dyno was not already SAE corrected (depending on relative humidity.)