Shelby Dyno
#1
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Shelby Dyno
This guy apparently has already dynoed his car, both with a baseline then again after changing the mufflers and gears.....
http://www.stangsunleashed.com/forum...opic=2230&st=0
http://www.stangsunleashed.com/forum...opic=2230&st=0
#3
Originally Posted by codeman94
wow.... an extra 33.6 rwhp from an axle back...looks like a lot of promise
#6
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its just a Flowmaster axleback, which makes me believe one of the set of runs is way off, that would be roughly 34rwhp gain for swapping out a muffler,
pic: http://www.stangsunleashed.com/forum...e=post&id=2025
I would lean more towards the first set of runs being a bit off, especially since the car only has 250miles on it, the comp isnt even done learning the engine and the revs, fuel/air ratios, ect.
if anything the second set of numbers are promising, even if the axlebacks gained almost 35rwhp, but probably more realistically Ford underrated it a bit and the mufflers gained at best 5hp and the car is actually closer to 520-525 HP at the crank
one person on that thread reported a Ford GT500 tech saying that it is actually closer to this 525HP at the crank, the extreme humidity and the heat could also damage the numbers a bit, but I think that the reason he finally saw the true numbers of this car is because of the 4.10s he put on, pulling that power into a more noticeable lower range of the power band since the darn computers on these cars limit everything as we all know by now, including limiting the revs before reaching peak power. On the Shelbies the rev limiter is suppose to kick in around 6250 RPMs and, as this was all discussed on the original thread already for those that read it, on the first set of runs the peak HP probably wouldve occured between 7000-7500 RPMs. So like the original poster of the thread stated it is very likely that the car comes stock around 525HP at the crank, you just cant see it until you at least reflash the comp and get rid of the limiter or raise it. And if thats the case this is a bad **** car, especially since all you need is a tuner to change the limiter, and since youre doing that you might as well increase the throttle response and lean it out a bit to get even more HP while you are at it. And if it holds true to what the 05-06GTs did with a retune, it could possibly get to 550 at the crank for a $300 tuner, NICE!!!
pic: http://www.stangsunleashed.com/forum...e=post&id=2025
I would lean more towards the first set of runs being a bit off, especially since the car only has 250miles on it, the comp isnt even done learning the engine and the revs, fuel/air ratios, ect.
if anything the second set of numbers are promising, even if the axlebacks gained almost 35rwhp, but probably more realistically Ford underrated it a bit and the mufflers gained at best 5hp and the car is actually closer to 520-525 HP at the crank
one person on that thread reported a Ford GT500 tech saying that it is actually closer to this 525HP at the crank, the extreme humidity and the heat could also damage the numbers a bit, but I think that the reason he finally saw the true numbers of this car is because of the 4.10s he put on, pulling that power into a more noticeable lower range of the power band since the darn computers on these cars limit everything as we all know by now, including limiting the revs before reaching peak power. On the Shelbies the rev limiter is suppose to kick in around 6250 RPMs and, as this was all discussed on the original thread already for those that read it, on the first set of runs the peak HP probably wouldve occured between 7000-7500 RPMs. So like the original poster of the thread stated it is very likely that the car comes stock around 525HP at the crank, you just cant see it until you at least reflash the comp and get rid of the limiter or raise it. And if thats the case this is a bad **** car, especially since all you need is a tuner to change the limiter, and since youre doing that you might as well increase the throttle response and lean it out a bit to get even more HP while you are at it. And if it holds true to what the 05-06GTs did with a retune, it could possibly get to 550 at the crank for a $300 tuner, NICE!!!
#7
I Have No Life
If you read the story...
The guy drove it there, and then baselined...
...then it sat for 2 hours while they installed the gears and mufflers....
Cooling off....
What he shoulda done was drove the car there, waited 2 hours....baselined....
Then put the other parts on....and see the difference.
It would not have been such a huge jump.
Who know how hard he was on the car before getting there.
I know if I had a Shelby brand new, I'd be flogging it a bit ...
Heck...even my 05 GT heats up like a ****
No way he got THAT much horsepower from a set of blowmasters.
Let alone ANY other axle back. It cannot be corked that much.
The guy drove it there, and then baselined...
...then it sat for 2 hours while they installed the gears and mufflers....
Cooling off....
What he shoulda done was drove the car there, waited 2 hours....baselined....
Then put the other parts on....and see the difference.
It would not have been such a huge jump.
Who know how hard he was on the car before getting there.
I know if I had a Shelby brand new, I'd be flogging it a bit ...
Heck...even my 05 GT heats up like a ****
No way he got THAT much horsepower from a set of blowmasters.
Let alone ANY other axle back. It cannot be corked that much.
#9
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Originally Posted by Grey03
WHERE'S THE TORQUE??? Those numbers seem low for a supercharged 5.4.
RWHP: 446.5 RWTRQ: 421.9
given a 15% loss
BHP: 525.29 BTRQ: 496.35
#10
the initial numbers are obviously way off; we need to wait and see what others post. Also, gears should NOT cause you to have a higher peak HP, that physically makes no sense. The exhaust is already a 2.5in system, and the headers appear better flowing than the 3v 4.6. I bet that flowmaster system gained nothing, and it all had to do with the car and temp. I know I lose a ton of power after driving hard in teh 100 degree heat for 20 minutes.
#11
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Originally Posted by svt boost
the initial numbers are obviously way off; we need to wait and see what others post. Also, gears should NOT cause you to have a higher peak HP, that physically makes no sense. The exhaust is already a 2.5in system, and the headers appear better flowing than the 3v 4.6. I bet that flowmaster system gained nothing, and it all had to do with the car and temp. I know I lose a ton of power after driving hard in teh 100 degree heat for 20 minutes.
#13
Originally Posted by rrobello
...with the gears you will reach the peak HP at a lower RPM ...
The Boss Hog
#14
Originally Posted by rrobello
he posted the torque:
RWHP: 446.5 RWTRQ: 421.9
given a 15% loss
BHP: 525.29 BTRQ: 496.35
RWHP: 446.5 RWTRQ: 421.9
given a 15% loss
BHP: 525.29 BTRQ: 496.35
#15
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Originally Posted by The Boss Hog
I hessitate to get into this but . . . . here goes. rrobello, that statement is simply not true. With lower gears (ie numerically higher), you will reach the peak HP at a lower MPH. The RPM that the engine reaches peak torque and hp remains the same.
The Boss Hog
The Boss Hog
#16
rrobello,
It is no crime to be a little confused. We all are from time to time. But I really don't know where to start because I don't know exactly where you are confused. Try this:
The rear end gear is a speed reduction gear. It trades speed for actual torque applied to the road. For any given tranny gear, the lower the rear end gear, the higher the acceleration and the lower the mph. Other than contributing to the parasitic losses of the drive line, the gears do not effect the actual output of the engine, but they do effect the performance of the car as stated above.
I sincerly hope that helps at least a little.
The Boss Hog
It is no crime to be a little confused. We all are from time to time. But I really don't know where to start because I don't know exactly where you are confused. Try this:
The rear end gear is a speed reduction gear. It trades speed for actual torque applied to the road. For any given tranny gear, the lower the rear end gear, the higher the acceleration and the lower the mph. Other than contributing to the parasitic losses of the drive line, the gears do not effect the actual output of the engine, but they do effect the performance of the car as stated above.
I sincerly hope that helps at least a little.
The Boss Hog
#17
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Originally Posted by The Boss Hog
rrobello,
It is no crime to be a little confused. We all are from time to time. But I really don't know where to start because I don't know exactly where you are confused. Try this:
The rear end gear is a speed reduction gear. It trades speed for actual torque applied to the road. For any given tranny gear, the lower the rear end gear, the higher the acceleration and the lower the mph. Other than contributing to the parasitic losses of the drive line, the gears do not effect the actual output of the engine, but they do effect the performance of the car as stated above.
I sincerly hope that helps at least a little.
The Boss Hog
It is no crime to be a little confused. We all are from time to time. But I really don't know where to start because I don't know exactly where you are confused. Try this:
The rear end gear is a speed reduction gear. It trades speed for actual torque applied to the road. For any given tranny gear, the lower the rear end gear, the higher the acceleration and the lower the mph. Other than contributing to the parasitic losses of the drive line, the gears do not effect the actual output of the engine, but they do effect the performance of the car as stated above.
I sincerly hope that helps at least a little.
The Boss Hog
That wasnt so painful was it? I dont know why you thought it was gonna be such a hassel mentioning this....lol!!!
#18
Originally Posted by rrobello
…does it make the car faster by simply going through the RPMs faster or does it actually shift where the car is reaching its peak power and torque to a lower RPM…
Originally Posted by rrobello
… I was looking at some dyno charts of runs with just changing the gears and it seemed that the lower gears hit the peak power sooner in the RPM range than the higher gears, not by much in most cases but it did move from what I could tell in the charts.
…
…
Originally Posted by rrobello
That wasnt so painful was it? I dont know why you thought it was gonna be such a hassel mentioning this....lol!!!
The Boss Hog
#19
Team Mustang Source
Originally Posted by svt boost
the initial numbers are obviously way off; we need to wait and see what others post. Also, gears should NOT cause you to have a higher peak HP, that physically makes no sense. The exhaust is already a 2.5in system, and the headers appear better flowing than the 3v 4.6. I bet that flowmaster system gained nothing, and it all had to do with the car and temp. I know I lose a ton of power after driving hard in teh 100 degree heat for 20 minutes.
#20
Originally Posted by codeman94
Maybe he is in the exhaust business, and is telling everyone how much of a "gain" you can get from his...
Or, maybe he was on the grassy knoll, and HE SHOT KENNEDY!
Come on, this guy is good enough to modify his new GT500 and take the time to share the results, and we're accusing him and/or criticizing him already? These are the first non-magazine numbers we have seen, and I am grateful that he took the time.