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12-15-03, 04:43 PM
| | Founding Member | | Join Date: June 2002 Location: 5 car lengths in front of you!
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| | | Interesting notes in how newer cars take time to adjust to new mods- dyno results
OK, so we have this supercruise, and it ends here at...well you all know where I work...
so we give away a catback system, and decide to install it there on the spot, and dyno the car before and after to show the gains......
The car- a stock 03 Cobra-
Baseline
370rwhp
Install catback
Dyno run 1
382rwhp
let car cool off
Dyno Run 2
383rwhp
let car cool off, drive the car at 3000RPM for 3 minutes
Dyno run 3
386 rwhp
let car cool off
Dyno run 4
389rwhp
drive car around a bit
Dyno run 5
393rwhp
We stopped there, but it was interesting to see the dyno numbers go up and up each dyno run.
Based on previous experience, two more runs would have gotten us to about 395-397rwhp
Also side notes- They decided to see how fast they could install a catback last night- they started with the car on the ground and had the car back on the ground again with the catback on in under 18 minutes.....
Whats really interesting about this, is you see so many dyno comparisons, but you wonder if they dyno the car 8 times with each set up or only once or twice....
Interesting stuff......
Now before someone tries to flame me, these dyno runs were done at a Mustang show we had here, with 143 Mustangs in attendance (well over 300 people), and was done to a random vehicle owned by someone who won the catback....
If that is not standing behind your numbers, I dont know what is-
I have not mentioned the name of my company, as I thought this was interesting tech.  |
12-15-03, 04:51 PM
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awesome! proves what i've believed all along......thanks for the info.  |
12-15-03, 04:57 PM
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12-15-03, 05:00 PM
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curious, was that the magnaflows or magnapacks? |
12-15-03, 05:00 PM
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I guess I need to redo mine prior to making more changes. I am curious if I actually have the 250 rwhp that I guessed I would have.
Bo |
12-15-03, 05:05 PM
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12-15-03, 07:52 PM
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12-15-03, 08:52 PM
|  | I fantasize about it being BIG! | | Join Date: April 2002 Location: not quite here
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23rwhp from just a cat back? even on an 03 Cobra that sounds inflated. |
12-15-03, 09:00 PM
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Why didn't you disconnect the battery for a bit after installing the exhaust ... or did you? It would've been more interesting to see a few runs each way with the new exhaust before/after disconnnecting the batt ... just for the hell of it. |
12-15-03, 09:05 PM
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Once the cat back is 'broken in' will they make still more power? |
12-16-03, 10:55 AM
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| | Quote: |
Originally Posted by DBMSTNG 23rwhp from just a cat back? even on an 03 Cobra that sounds inflated. |
Like I said, we did this in front of well over 300 Mustang enthusiasts, at a car show, with a randomly selected car...basically he won an auction.....
I know the numbers sound high, I think its one of those things where you have to see it to believe it, but that is why we do this everytime we have an open house, so that people can see it with their own eyes,
so they can see we are not, icing the intake, running it with the A/C on, or any other trick to inflate the numbers-
The problem with disconnecting the battery, is that it resets the computer back to stock specifications, so even if you disconnect the battery, the car will still think it has the stock exhaust on it.....
The only way to let the computer adjust is to drive the car.
For this reason, you never want to disconnect the battery on a modded car right before you race it...as it will be set back to stock computer settings....
The catback will not make more power once it is broken in, it is all in the computer adjusting to the flow of the exhaust.....
Sometimes the sound though, can be deceiving as when the car makes more noise, it can make you think it is faster then it actually is.... |
12-16-03, 11:00 AM
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very interesting, thanks for the post |
12-16-03, 11:01 AM
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That's the bummer about dyno-ing a car.
Each run the car gets stronger and stronger, and by the end of 3 pulls it leaves you wondering how high you could get.
Each time I've been tempted to throw another $45 at the tech and tell him to run 3 more before unstrapping the car.
Matt |
12-16-03, 11:04 AM
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I noticed that my car seemed to get faster after a few short trips when I installed the Magnaflow Xpipe and borla stingers. At least this proves my butt o meter was correct. Thanks for the info |
12-16-03, 12:02 PM
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I've seen that happen when the oil temp wasn't up for the first pulls. What I really suspect is that the dyno HP correction factor was changing - the temp pickup for the dyno was seeing increasingly higher temps but the air to the engine was not. |
12-16-03, 12:50 PM
|  | Stay thirsty my friends | | Join Date: December 2001 Location: SN Moderator: Orlando, Fl.
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Interesting. One thing is for sure. The cat-back certainly helped this car. |
12-16-03, 01:11 PM
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Ive read somewhere that the 03 cobras have extremely restricive mufflers in order to pass the sound standards, due to the additional noise of the supercharger. Maybe an explanation......... |
12-16-03, 01:17 PM
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Posts: 4,922
| | Quote: |
Originally Posted by GNN60GT500 Like I said, we did this in front of well over 300 Mustang enthusiasts, at a car show, with a randomly selected car...basically he won an auction.....
I know the numbers sound high, I think its one of those things where you have to see it to believe it, but that is why we do this everytime we have an open house, so that people can see it with their own eyes,
so they can see we are not, icing the intake, running it with the A/C on, or any other trick to inflate the numbers-
The problem with disconnecting the battery, is that it resets the computer back to stock specifications, so even if you disconnect the battery, the car will still think it has the stock exhaust on it.....
The only way to let the computer adjust is to drive the car.
For this reason, you never want to disconnect the battery on a modded car right before you race it...as it will be set back to stock computer settings....
The catback will not make more power once it is broken in, it is all in the computer adjusting to the flow of the exhaust.....
Sometimes the sound though, can be deceiving as when the car makes more noise, it can make you think it is faster then it actually is.... | |
12-16-03, 01:20 PM
| | Banned | | Join Date: December 2003
Posts: 40
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Oh man I cant believe you idiots believe this guy. He probably works for magnaflow. Hey magnaflow dude stop posting all this BS. There is seriously something wrong with that dyno. How can it go from a 10rwhp gain to a 23rwhp gain in a few minutes? Only 23rwhp? ahahhahahahha. Put a densecharger on an 03 cobra and you get 25rwhp. Dont waste my time. Where's the results on a regular 2v? Seems like you should have posted those awhile back, but they never appeared. Pretty convenient. Later.
Last edited by DHGBullitt4.6; 12-16-03 at 01:21 PM.
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12-16-03, 02:19 PM
| | Founding Member | | Join Date: June 2002 Location: Help I can't see !!!!!!
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Originally Posted by DHGBullitt4.6 Oh man I cant believe you idiots believe this guy. He probably works for magnaflow. Hey magnaflow dude stop posting all this BS. There is seriously something wrong with that dyno. How can it go from a 10rwhp gain to a 23rwhp gain in a few minutes? Only 23rwhp? ahahhahahahha. Put a densecharger on an 03 cobra and you get 25rwhp. Dont waste my time. Where's the results on a regular 2v? Seems like you should have posted those awhile back, but they never appeared. Pretty convenient. Later. | Yes he works for magnaflow and GNN60GT500 has also been on this site alot longer than you. He posts valid and true information with no BS advertising stuff. You need to learn who and who not to criticize on this site.  |
12-16-03, 03:15 PM
| | Official Member | | Join Date: February 2003 Location: Georgia
Posts: 834
| | Quote: |
Originally Posted by DHGBullitt4.6 Oh man I cant believe you idiots believe this guy. He probably works for magnaflow. Hey magnaflow dude stop posting all this BS. There is seriously something wrong with that dyno. How can it go from a 10rwhp gain to a 23rwhp gain in a few minutes? Only 23rwhp? ahahhahahahha. Put a densecharger on an 03 cobra and you get 25rwhp. Dont waste my time. Where's the results on a regular 2v? Seems like you should have posted those awhile back, but they never appeared. Pretty convenient. Later. |
You are an idiot
Later |
12-16-03, 03:49 PM
| | Founding Member | | Join Date: August 2002 Location: back in Marylands
Posts: 4,922
| | Quote: |
Originally Posted by DHGBullitt4.6 Oh man I cant believe you idiots believe this guy. He probably works for magnaflow. Hey magnaflow dude stop posting all this BS. There is seriously something wrong with that dyno. How can it go from a 10rwhp gain to a 23rwhp gain in a few minutes? Only 23rwhp? ahahhahahahha. Put a densecharger on an 03 cobra and you get 25rwhp. Dont waste my time. Where's the results on a regular 2v? Seems like you should have posted those awhile back, but they never appeared. Pretty convenient. Later. | I thought this guy got banned for using 2 names?  |
12-16-03, 04:08 PM
| | Banned | | Join Date: December 2003
Posts: 40
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I never got banned. I just quit using my old name. To all you other "guys" I just say what I am feeling towards the subject. In this case it was the cat back. |
12-16-03, 04:26 PM
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Posts: 834
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Originally Posted by DHGBullitt4.6 I never got banned. I just quit using my old name. To all you other "guys" I just say what I am feeling towards the subject. In this case it was the cat back. |
Ever heard the saying "Think before you speak" I know it mught be difficult but you should try it |
12-16-03, 06:15 PM
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Originally Posted by Roger Ramjet I've seen that happen when the oil temp wasn't up for the first pulls. What I really suspect is that the dyno HP correction factor was changing - the temp pickup for the dyno was seeing increasingly higher temps but the air to the engine was not. | Actually before the first dyno, for the baseline, we made sure to get the car nice and hot, we did this by warming the car up, and then running the car on the dyno 3 times before doing the final test to get the baseline numbers...
What you are saying is true, along with the gear oil in the rear end will also heat up as well increasing dyno numbers, so there are quite a few factors we were sure to look at.
The 03 Cobra has a VERY restrictive exhaust, we actually cut open a stock muffler, and the exhaust is only 2" through the muffler, which would explain the big gains with a catback
Before we did the first measured dyno run after the install, we also did 3 runs as well to get the oil and fluids nice and hot.....
The gains are one thing, but I though it was interesting to see how many runs it takes for a car to fully adjust.
It really makes me think about all the dyno comparisons I see, where they throw on a couple of different parts and dyno test them all....
I wonder how fair all dyno tests really are when they are not taking the time to do all of these dyno runs..... | | Thread Tools | | | | Display Modes |  Linear Mode | 
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