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Some of you might not know that you can test your car's performance thanks to your Android or iPhone very easily and for free. This thread will be for Android users but iphone users can also find their own app and use the information here as well.
Before some sceptics come on here and polute this thread with rubish like "you can't do that with a phone blah blah" or "the only way is to use a rolling road dyno that costs $$$$"... Please, keep that out of this thread. Apps for android and iphone have been proved to be precise when used properly.
Even very expensive rolling road dynos are completely unreliable when not used properly. This is why I started this thread, to show everyone how to use the phone apps properly and get a fairly accurate results out of them.
Now here's the walkthrough on how to Dyno test your car :
1 ) First things first, download the free app called "aDyno" : https://market.android.com/details?id=net.adyno.adyno&feature=search_result
2 ) Launch the app and create a profile for your car (current car option). Here's the info I use for my car which is a 2007 Bravo Multijet 1.9 8v 120 :
Pitch : 2.00°/G
Roll : 2.5°/G (lower this a little if you have a lowered car that has reduced bodyroll)
Weight : 1370 Kg ***
Additional weight : 80 Kg (this should be the weight of anhything extra in your car like your weight,passenger, fuel etc...)
Drive train losses : 15%
Drag : 0.32
Frontal area : 2m²
Min Speed RPM : 1500rpm ***
Max Speed RPM : 5000rpm ***
Min Speed : 25kmh ***
Max Speed : 78kmh ***
The values that are certainly different in cars that are not the same model as mine have a *** next to them.
Here's a link where you can find the specs for other Bravo models : http://www.carfolio.com/specifications/models/?man=2049
3 ) Mount your phone in your car. it must be vertical with the screen facing the rear of the car. if your car dock is shacky, use some temporary tape or have someone sit with you in the car to hold the phone firmly against the dash. On the bravo, just above the radio's CD slot is the right spot for a good GPS signal and right angle.
4 ) Find a good stretch of horizontal road where you can go from 0 to 80kmh (50mph) in one run without being bothered.
5 ) you're ready to test your car now, you have to choose a gear in which to do the run, it can be either 2nd or 3rd depending on your car's model.
Choose the gear in which you car accelerates the best at 2000rpm. In my case that would be 3rd gear, but then I'd need a longer stretch of road to reach the red line so I chose to do it in second gear.
6 ) Find your MINIMUM SPEED and MAXIMUM SPEED.
The MINIMUM SPEED is how fast your car goes when you're at 1500rpm in your selected gear.
The MAXIMUM SPEED is how fast your car goes when your at the maximum RPM in your selected gear.
I can't give you the MAX/MIN speeds nor max RPM for your specific car, you have to do a test to find them. Those values depend on your engine, gearbox, wheels and remap. They're extremely important for the accuracy of the dyno run because they're the starting and stoping marks from which the app starts recording your run.
7 ) Start testing by making multiple runs, a run goes like this :
- From a standstill, activate the GPS in your phone and open the aDyno app.
- Select the Dynamometer option.
- Verify the status (it should be saying press start if all is good)
- Press the start button and start driving when it tells you to. Get passed the first gear as fast a possible and then push the pedal to the floor when in second gear (or third if you chose it) until your engine redlines.
- When the engine redlines you're supposed to have reached the maximum speed, break right away and wait for the app to calculate.
Done !
Now come back here and post you BHP and Torque results.
The app can also record 0 to 60 times 100% accurately which can also be interesting to compare.
Before some sceptics come on here and polute this thread with rubish like "you can't do that with a phone blah blah" or "the only way is to use a rolling road dyno that costs $$$$"... Please, keep that out of this thread. Apps for android and iphone have been proved to be precise when used properly.
Even very expensive rolling road dynos are completely unreliable when not used properly. This is why I started this thread, to show everyone how to use the phone apps properly and get a fairly accurate results out of them.
Now here's the walkthrough on how to Dyno test your car :
1 ) First things first, download the free app called "aDyno" : https://market.android.com/details?id=net.adyno.adyno&feature=search_result
2 ) Launch the app and create a profile for your car (current car option). Here's the info I use for my car which is a 2007 Bravo Multijet 1.9 8v 120 :
Pitch : 2.00°/G
Roll : 2.5°/G (lower this a little if you have a lowered car that has reduced bodyroll)
Weight : 1370 Kg ***
Additional weight : 80 Kg (this should be the weight of anhything extra in your car like your weight,passenger, fuel etc...)
Drive train losses : 15%
Drag : 0.32
Frontal area : 2m²
Min Speed RPM : 1500rpm ***
Max Speed RPM : 5000rpm ***
Min Speed : 25kmh ***
Max Speed : 78kmh ***
The values that are certainly different in cars that are not the same model as mine have a *** next to them.
Here's a link where you can find the specs for other Bravo models : http://www.carfolio.com/specifications/models/?man=2049
3 ) Mount your phone in your car. it must be vertical with the screen facing the rear of the car. if your car dock is shacky, use some temporary tape or have someone sit with you in the car to hold the phone firmly against the dash. On the bravo, just above the radio's CD slot is the right spot for a good GPS signal and right angle.
4 ) Find a good stretch of horizontal road where you can go from 0 to 80kmh (50mph) in one run without being bothered.
5 ) you're ready to test your car now, you have to choose a gear in which to do the run, it can be either 2nd or 3rd depending on your car's model.
Choose the gear in which you car accelerates the best at 2000rpm. In my case that would be 3rd gear, but then I'd need a longer stretch of road to reach the red line so I chose to do it in second gear.
6 ) Find your MINIMUM SPEED and MAXIMUM SPEED.
The MINIMUM SPEED is how fast your car goes when you're at 1500rpm in your selected gear.
The MAXIMUM SPEED is how fast your car goes when your at the maximum RPM in your selected gear.
I can't give you the MAX/MIN speeds nor max RPM for your specific car, you have to do a test to find them. Those values depend on your engine, gearbox, wheels and remap. They're extremely important for the accuracy of the dyno run because they're the starting and stoping marks from which the app starts recording your run.
7 ) Start testing by making multiple runs, a run goes like this :
- From a standstill, activate the GPS in your phone and open the aDyno app.
- Select the Dynamometer option.
- Verify the status (it should be saying press start if all is good)
- Press the start button and start driving when it tells you to. Get passed the first gear as fast a possible and then push the pedal to the floor when in second gear (or third if you chose it) until your engine redlines.
- When the engine redlines you're supposed to have reached the maximum speed, break right away and wait for the app to calculate.
Done !
Now come back here and post you BHP and Torque results.
The app can also record 0 to 60 times 100% accurately which can also be interesting to compare.
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