Quick/Simple/Cheap 3.2 Dyno
Thread Starter
Race Car
Joined: May 2003
Posts: 4,243
Likes: 103
From: SoCal
Quick/Simple/Cheap 3.2 Dyno
Using a cheap ($12.99) and quick/simple Apple iTouch/iPhone app,
one can easily dyno any vehicle. Using that app and having PCA
at the California Festival of Speed at Fontana on 4/4 weigh (2902 lbs)
my '88 3.2, the following was obtained:
(Note: The max HP was 224 (crank - 15% loss) and the max acceleration was .54 Gs & for stock vehicle.)
one can easily dyno any vehicle. Using that app and having PCA
at the California Festival of Speed at Fontana on 4/4 weigh (2902 lbs)
my '88 3.2, the following was obtained:
(Note: The max HP was 224 (crank - 15% loss) and the max acceleration was .54 Gs & for stock vehicle.)
I haddah Google dat
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Joined: Nov 2008
Posts: 11,501
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From: Fresno, CA
I try to avoid the Apple store. Those displays and the salespeople are so good, I'm doomed as soon as I step foot in that place.
oh wait, if it works better with my Blaupunkt bluetooth then done deal.
oh wait, if it works better with my Blaupunkt bluetooth then done deal.
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Joined: Sep 2008
Posts: 98
Likes: 5
From: New England West Coast
How accurate was it in guessing what your max speed was there? If that's accurate, then the accelerometer is working pretty well. Of course you've got to throw the weight of the car in there somewhere to convert a measure of acceleration into power.
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From: Cumberland, RI
Unless you have a laptop w/ a wideband O2 sensor, I'm always going to tell you to hit a real dyno shop whenever you're making adjustments to the system & testing for power changes after.
It's pretty easy to make a change to a car that is supposed to do X by actually does Y to your air/fuel mixture. Wanna burn up a piston? That's a pretty good way to do it. I always make sure I get the Air/Fuel ratio readings when running a new config, and if it's off-base, you can shut see it real-time & shut down the run before you do serious damage.
Otherwise, neat toy. So have you seen what your quarter-mile times are yet? I know before I got the car my PO did some high 13-second 1/4's out in Michigan with the Weltmeister chip & stock exhaust.
It's pretty easy to make a change to a car that is supposed to do X by actually does Y to your air/fuel mixture. Wanna burn up a piston? That's a pretty good way to do it. I always make sure I get the Air/Fuel ratio readings when running a new config, and if it's off-base, you can shut see it real-time & shut down the run before you do serious damage.
Otherwise, neat toy. So have you seen what your quarter-mile times are yet? I know before I got the car my PO did some high 13-second 1/4's out in Michigan with the Weltmeister chip & stock exhaust.
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Joined: Jun 2008
Posts: 1,198
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From: Brockville, ON
I got the same Ap for my iPhone.
http://dynolicious.com/
Haven't tried it yet tho.
2 reasons, I haven't figured out a good horizontal mount for my phone in the car yet, and it's been FRIGGIN snowing here for two days!!!
I have read that it is necessary to calibrate the Ap with your phone and to have it in a good solid horizontal position when testing.
I have an Autothority chip that I haven't installed yet, and I wanted to be able to do a before and after comparison.
It's supposed to be nice this weekend, so we'll see how it goes.
Fingers crossed
http://dynolicious.com/
Haven't tried it yet tho.
2 reasons, I haven't figured out a good horizontal mount for my phone in the car yet, and it's been FRIGGIN snowing here for two days!!!
I have read that it is necessary to calibrate the Ap with your phone and to have it in a good solid horizontal position when testing.
I have an Autothority chip that I haven't installed yet, and I wanted to be able to do a before and after comparison.
It's supposed to be nice this weekend, so we'll see how it goes.
Fingers crossed
Thread Starter
Race Car
Joined: May 2003
Posts: 4,243
Likes: 103
From: SoCal
"I haven't figured out a good horizontal mount for my phone in the car yet."
Actually, I bought the RAM mount per the Dynolicious website, but found
that just placing it in a firm position (basically horizontal) on the passenger
seat worked great. Once you calibrate it, you can check the accelerometers
in the Skidpad mode as the iPhone/iTouch is rotated about the various axis'.
It should indicate 1 G per each axis.
One of the best aspects of using this device is the very short time (in my
case about 8 seconds) to determine HP versus having to more stress the
engine to determine the HP via using an actual dyno. Most 911 owners
do daily drives similiar to my test, i.e. going to about 5800 RPMs only
in 1st & 2nd and shifting easily into 3rd, i.e. (As they view the adjacent
"rice burner" in the rear view mirror).
For those that want detail data, the app provides tabular data, e.g. 1/8 mile,
1000', & 1/4 mile, etc. points with time & speed, and max Gs and max speed.
The accuracy is very very good as exemplified from use on my turbo
Mini S and my 911, both results correlate with the factory data.
Obviously, the key is determining the true vehicle weight which the Fontana
PCA club guys determined for me.
Actually, I bought the RAM mount per the Dynolicious website, but found
that just placing it in a firm position (basically horizontal) on the passenger
seat worked great. Once you calibrate it, you can check the accelerometers
in the Skidpad mode as the iPhone/iTouch is rotated about the various axis'.
It should indicate 1 G per each axis.
One of the best aspects of using this device is the very short time (in my
case about 8 seconds) to determine HP versus having to more stress the
engine to determine the HP via using an actual dyno. Most 911 owners
do daily drives similiar to my test, i.e. going to about 5800 RPMs only
in 1st & 2nd and shifting easily into 3rd, i.e. (As they view the adjacent
"rice burner" in the rear view mirror).
For those that want detail data, the app provides tabular data, e.g. 1/8 mile,
1000', & 1/4 mile, etc. points with time & speed, and max Gs and max speed.
The accuracy is very very good as exemplified from use on my turbo
Mini S and my 911, both results correlate with the factory data.
Obviously, the key is determining the true vehicle weight which the Fontana
PCA club guys determined for me.