Drivetrain What is your take on Dynolicious?
6th Gear
Joined: Sep 2003
Posts: 2,268
Likes: 4
From: Always curious ...
That'll be nice! Let us know the results!
did you have wheel spin or anything? thats the only time i get awkward readings.
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3rd Gear
Joined: Mar 2009
Posts: 175
Likes: 0
From: Bellingham, WA
The accelerometer in the iPhone calculates the hp by the following:
Force = mass X acceleration (hence you need to provide it with the mass of car+driver)
Work = force X distance
Power = work / time
So assuming the weight that you enter is correct, then in theory it should be giving you the actual power that you are putting to the ground to make the car accelerate. So if your launches are poor (you spin the wheels) and/or inconsistent, then the iPhone will be calculating a different HP from what you may have gotten from a dyno, say.
When you say it is "not giving an accurate reading" what are you comparing it to?
Force = mass X acceleration (hence you need to provide it with the mass of car+driver)
Work = force X distance
Power = work / time
So assuming the weight that you enter is correct, then in theory it should be giving you the actual power that you are putting to the ground to make the car accelerate. So if your launches are poor (you spin the wheels) and/or inconsistent, then the iPhone will be calculating a different HP from what you may have gotten from a dyno, say.
When you say it is "not giving an accurate reading" what are you comparing it to?
6th Gear
Joined: Sep 2003
Posts: 2,268
Likes: 4
From: Always curious ...
Ah, OK.
Assuming the dyno results are accurate and the accelerometer is accurate, then the factors that would cause a disparity in HP results would be:
(a) improperly mounted iPhone (it doesn't move exactly with the car)
(b) driver is not driving the car at its maximum acceleration capacity
(c) wheels are spinning instead of grabbing the road and moving the car
Once you are satisfied with the HP you have through mods/tunes as verified by a dyno check, then Dynolicious is a great way to check upon the other factors that make the car go fast (rubber and driver).
Assuming the dyno results are accurate and the accelerometer is accurate, then the factors that would cause a disparity in HP results would be:
(a) improperly mounted iPhone (it doesn't move exactly with the car)
(b) driver is not driving the car at its maximum acceleration capacity
(c) wheels are spinning instead of grabbing the road and moving the car
Once you are satisfied with the HP you have through mods/tunes as verified by a dyno check, then Dynolicious is a great way to check upon the other factors that make the car go fast (rubber and driver).
Found some HP advice from Dynolicious's developer!
for what it's worth ... last night i was browsing the Dynolicious.com forums and found a thread in which the developer offered this advice:
In my experience, you'll usually find your peak horsepower with Dynolicious in 2nd gear. This is where most of the variables are limited. If you are looking to get a good horsepower run you'll want to ease into first gear and try not to jerk too much on launch, shift early into second, then floor it (although every car is different, so I won't say this is the best for everyone).
[...snip...]
You should be able to see where the peak HP is being generated. If you're seeing peak when you launch the car, it's probably because of the initial shock of the launch, and not the true HP of the engine.
Hope this helps!
In my experience, you'll usually find your peak horsepower with Dynolicious in 2nd gear. This is where most of the variables are limited. If you are looking to get a good horsepower run you'll want to ease into first gear and try not to jerk too much on launch, shift early into second, then floor it (although every car is different, so I won't say this is the best for everyone).
[...snip...]
You should be able to see where the peak HP is being generated. If you're seeing peak when you launch the car, it's probably because of the initial shock of the launch, and not the true HP of the engine.
Hope this helps!
Update:
Last weekend I attended an autocross school (my first time ever). Did a couple runs with Dynolicious running, including a run in a friend's 911. My Cooper S was running with stock all-season runflat tires and the heavy 17" crown spoke wheels.
Screenshot of the app at the end of a run, skidpad mode:
Skidpad graph:
Skidpad graph for my friend's 911:
Love this app.
Last weekend I attended an autocross school (my first time ever). Did a couple runs with Dynolicious running, including a run in a friend's 911. My Cooper S was running with stock all-season runflat tires and the heavy 17" crown spoke wheels.
Screenshot of the app at the end of a run, skidpad mode:
Skidpad graph:
Skidpad graph for my friend's 911:
Love this app.
I'm sure this wouldn't work for an F1 car but for the sort of G's I can pull in a Mini, it works great!
Can't help you ... I'm just using it for skidpad, not straight-line measurements. If you set drivetrain loss to 0% then you will get actual wheel horsepower. Not sure what correction factor to use to try to get crank power. Maybe one of the other guys here can help.
1st Gear
Joined: Nov 2005
Posts: 38
Likes: 0
thx bratling ..
also how much is the total weight of a r53 .. if you look up the specs do these include the fluids (it never states if it it's the dry or wet weight)
who here has actually been on a weighbridge with his r53 ?
also how much is the total weight of a r53 .. if you look up the specs do these include the fluids (it never states if it it's the dry or wet weight)
who here has actually been on a weighbridge with his r53 ?
My MINI tipped the scales at 2900 lbs with a full tank of gas, and me sitting in it.(im 200lbs) I have a heavier MINI since i have the Xenons, sunroof, h/k, etc. Go to a truck stop. I stopped at one with Cat Scales. I think it was about $8 to get weighed. the fun part is driving onto the deck and having to jump up in the air to push the button (its mounted high so truck drivers can press it from their cab.) Of course you can estimate your weight, but going to a scale with make sure your results are just that more accurate.
2nd Gear
Joined: Jun 2007
Posts: 65
Likes: 0
I've had pretty good results putting my iphone in the ashtray. With the ashtray in a front cup holder, and the top flipped open towards the front of the car, I then put a rubber band around the iphone and the ashtray lid thats behind the iphone.
Keeps it nice and solid and I can easily access the buttons on the phone.
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