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Dyno App Results. Too good to be true?

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Ox-y-GenIII

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Discussion starter · #1 ·
I used an app on my Iphone called PocketDyno+, it's a paid app if that means anything to anyone. $12 but I downloaded it a long time ago for use with my old car.

It recorded pretty accurate results on my old car compared to actual dyno numbers when I finally got it on the dyno. It was within 3whp and 4tq.

Well here is my stock in App results:
HP @ the wheels 130.1
60' 2.70 seconds
330' 6.98 seconds
1/8 10.55 @ 70.49 mph
1000' 13.60 seconds
1/4 16.21 @ 86.57
0-60 8.03 seconds

In App results with FSWerks intake and exhausts:
HP @ the wheels 157.3
60' 2.53 seconds
330' 6.54 seconds
1/8 9.81 @ 77.28 mph
1000' 12.58 seconds
0-60 6.50 seconds


So to debate, temps around the same, time of day around the same, mileage on first run was around 1200, mileage now 7500. Could an intake and exhaust gain an increase of 27hp? I don't think so. Do the stock numbers compare to stock numbers elsewhere? Anyone else try an app like this? Post your results and discuss.
 
#2 ·
I don't think you would get that much of an increase.... which poses my question of how does it work? is it just using the accelerometer in the phone?

That being said though, I see redfocz has run his stock on a dyno with 148whp so your second run may be more accurate.
 
Discussion starter · #3 ·
mikebontoft said:
I don't think you would get that much of an increase.... which poses my question of how does it work? is it just using the accelerometer in the phone?

That being said though, I see redfocz has run his stock on a dyno with 148whp so your second run may be more accurate.
Click to expand...
Ya you have to calibrate the accelerometers before each run. Also, redfocz dyno was with the 5mt, the 6speed auto dynos lower.
 
#4 ·
ah my mistake.....

if these are anything like what I think they are, they give you a ton of gears for an automatic but they put the emphasis on torque. Sounds mostly accurate... at least for $12 you get a fairly good idea.
 
#5 ·
The resolution of the accelerometer and the accuracy of the initial conditions will effect the results greatly. I wouldn't put a lot of trust in the results.

There are purpose made tools that do much the same thing but with better components.


Brian
 
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Discussion starter · #6 ·
raptor1956 said:
The resolution of the accelerometer and the accuracy of the initial conditions will effect the results greatly. I wouldn't put a lot of trust in the results.

There are purpose made tools that do much the same thing but with better components.


Brian
Click to expand...
True, but don't you think the company would have some sort of algorithm for determining accuracy to estimate numbers?

Also, anyone know of the stock 0-60 etc from a 2012 Focus Review? or stock hp from a 6-spd 2012?
 
#7 ·
the 0 to 60 looks about right, maybe a little too fast, motor trend had it at 8.3 and car and driver had it at 8.1
 
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#10 ·
Ox-y-GenIII said:
True, but don't you think the company would have some sort of algorithm for determining accuracy to estimate numbers?

Also, anyone know of the stock 0-60 etc from a 2012 Focus Review? or stock hp from a 6-spd 2012?
Click to expand...
Stock 6speed auto 148whp 132 ftlbs
 
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#11 ·
It may have something to do with the engine breaking in as well. Not unusual for a motor to begin making more power as it seats the rings, bearings, etc...
The Owner's Manual states, "We do not recommend taking fuel economy measurements during the first 1,000 miles (1,600 km) of driving (engine break-in period). You will get a more accurate measurement after 2,000 miles–3,000 miles (3,000 km–5,000 km)." As your first run was at 1,200 miles (vs the 2nd run at 7,500), I'd say it's quite possible the engine was probably still breaking-in to some degree during the first run, and that the results (barring some accuracy issues with the app), was possibly the result of the engine breaking-in AND the exhaust. Just my $.02 though.
 
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#12 ·
I think the main limitation isn't the app but the hardware and putting in the correct values for weight. Even a small difference the weight of the wheels and tires has a huge effect on vehicle acceleration so unless you know the weight, or more accurately, the moment of inertia for your wheels this is going to be just a rough estimate!


Brian
 
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Discussion starter · #15 ·
I weighed my car with a half tank of gas at a recycling center. I don't have the number right now but I think it was 3,205 with me in it.

Also found this on Edmunds.com
Track Test Results

Acceleration, 0-30 mph (sec.) 3.4

0-45 mph (sec.) 5.6

0-60 mph (sec.) 8.7

0-75 mph (sec.) 12.6

1/4-mile (sec. @ mph) 16.4 @ 85.4

0-60 with 1 foot of rollout (sec.) 8.3
 
#16 ·
Ox-y-GenIII said:
I weighed my car with a half tank of gas at a recycling center. I don't have the number right now but I think it was 3,205 with me in it.

Also found this on Edmunds.com
Track Test Results

Acceleration, 0-30 mph (sec.) 3.4

0-45 mph (sec.) 5.6

0-60 mph (sec.) 8.7

0-75 mph (sec.) 12.6

1/4-mile (sec. @ mph) 16.4 @ 85.4

0-60 with 1 foot of rollout (sec.) 8.3
Click to expand...
Yeah those numbers all seem reasonable.
 
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darkangelism
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