A couple Gryphon ???'s
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Senior Member
Joined: Jul 2007
Posts: 434
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From: Vegas
A couple Gryphon ???'s
Hey guys I am a fairly new owner of a gryphon programmer and love it so far! 
I am wanted to change a couple things and want some of your guys opinions first. One thing is my standard shift points, I feel that my truck shifts too soon so i want to know what you guys have your shift points at? And i can not seem to figure out my tires size for the life of me so if anyone can help me out with that too it would be much appreciated! Thanks a lot guys.
Oh and my tire size is a 35/12.50/17, Toyo M/T.
I am wanted to change a couple things and want some of your guys opinions first. One thing is my standard shift points, I feel that my truck shifts too soon so i want to know what you guys have your shift points at? And i can not seem to figure out my tires size for the life of me so if anyone can help me out with that too it would be much appreciated! Thanks a lot guys.Oh and my tire size is a 35/12.50/17, Toyo M/T.
Senior Member
Joined: Aug 2008
Posts: 2,042
Likes: 1
From: Clemson, SC
If you head to PHPs website they have a ton of information under "Support."
Here's their manual for the Gryphon:
http://dygytalworld.ehost-services13...02004-2008.pdf
For the tire size:
So in your case:
First convert your numbers with the following website:
http://www.redrock4x4.com/tech/tire_...ethod=standard
I got 318/72/17.
Now using the formula:
1. 318 x 72 x .02 = 457.92
2. 17 x 25.4 = 431.8
3. 457.92 + 431.8 = 889.72
4. 889.72 x Pi = 2795.14
That is with your tires as perfect circles. They then multiply by .97 to account for air pressure and "squish."
That would put your tires at approximately 2710 mm.
As for the shift points, it's personal preference and up to you. Play with it and find what you like.
Here's their manual for the Gryphon:
http://dygytalworld.ehost-services13...02004-2008.pdf
For the tire size:
Originally Posted by Gryphon Manual
TIRE SIZE
The Gryphon™ can also correct for changes in tire size. If you have changed your tires to a different size, the PCM will miscalculate the vehicle speed, which can affect your vehicle’s shifting and speedometer reading. Correcting the tire size will allow the PCM to accurately calculate vehicle speed and odometer readings. You will find a “placeholder” value for tire size here, retrieved from the Calibration section of the PCM that may not be correct.
After choosing to set your tire size, the screen to the right will appear. The numbers on this screen should be adjusted to your tires’ circumference by pressing the [UP] or [DOWN] arrow keys.
Your tire circumference can be determined in different ways:
You can measure your tire’s circumference by marking the tire, rolling it one complete revolution, and measuring the distance in inches or millimeters. To convert inches to millimeters, simply multiply by 25.4.
You can also use the following equation to approximate your tire’s loaded circumference:
[(width X ratio X 0.02) + (rim X 25.4)] X 3.1416 X 0.97 = tire circumference
Example: Your tire size is 285 / 75 - 17.
Multiply Width, Ratio, and 0.02 (285 X 75 X 0.02)
Multiply Rim and 25.4 (17 X 25.4)
Add Step #1 and Step #2 27.5 + 431.8
Multiply Step #3 by 3.1416 859.3 X 3.1416
Your tire’s circumference in millimeters 2619
The Gryphon™ can also correct for changes in tire size. If you have changed your tires to a different size, the PCM will miscalculate the vehicle speed, which can affect your vehicle’s shifting and speedometer reading. Correcting the tire size will allow the PCM to accurately calculate vehicle speed and odometer readings. You will find a “placeholder” value for tire size here, retrieved from the Calibration section of the PCM that may not be correct.
After choosing to set your tire size, the screen to the right will appear. The numbers on this screen should be adjusted to your tires’ circumference by pressing the [UP] or [DOWN] arrow keys.
Your tire circumference can be determined in different ways:
You can measure your tire’s circumference by marking the tire, rolling it one complete revolution, and measuring the distance in inches or millimeters. To convert inches to millimeters, simply multiply by 25.4.
You can also use the following equation to approximate your tire’s loaded circumference:
[(width X ratio X 0.02) + (rim X 25.4)] X 3.1416 X 0.97 = tire circumference
Example: Your tire size is 285 / 75 - 17.
Multiply Width, Ratio, and 0.02 (285 X 75 X 0.02)
Multiply Rim and 25.4 (17 X 25.4)
Add Step #1 and Step #2 27.5 + 431.8
Multiply Step #3 by 3.1416 859.3 X 3.1416
Your tire’s circumference in millimeters 2619
First convert your numbers with the following website:
http://www.redrock4x4.com/tech/tire_...ethod=standard
I got 318/72/17.
Now using the formula:
1. 318 x 72 x .02 = 457.92
2. 17 x 25.4 = 431.8
3. 457.92 + 431.8 = 889.72
4. 889.72 x Pi = 2795.14
That is with your tires as perfect circles. They then multiply by .97 to account for air pressure and "squish."
That would put your tires at approximately 2710 mm.
As for the shift points, it's personal preference and up to you. Play with it and find what you like.
Last edited by mblouir; Aug 30, 2009 at 10:15 PM.
Thread Starter
|
Senior Member
Joined: Jul 2007
Posts: 434
Likes: 0
From: Vegas
If you head to PHPs website they have a ton of information under "Support."
Here's their manual for the Gryphon:
http://dygytalworld.ehost-services13...02004-2008.pdf
For the tire size:
So in your case:
First convert your numbers with the following website:
http://www.redrock4x4.com/tech/tire_...ethod=standard
I got 318/72/17.
Now using the formula:
1. 318 x 72 x .02 = 457.92
2. 17 x 25.4 = 431.8
3. 457.92 + 431.8 = 889.72
4. 889.72 x Pi = 2795.14
That is with your tires as perfect circles. They then multiply by .97 to account for air pressure and "squish."
That would put your tires at approximately 2710 mm.
As for the shift points, it's personal preference and up to you. Play with it and find what you like.
Here's their manual for the Gryphon:
http://dygytalworld.ehost-services13...02004-2008.pdf
For the tire size:
So in your case:
First convert your numbers with the following website:
http://www.redrock4x4.com/tech/tire_...ethod=standard
I got 318/72/17.
Now using the formula:
1. 318 x 72 x .02 = 457.92
2. 17 x 25.4 = 431.8
3. 457.92 + 431.8 = 889.72
4. 889.72 x Pi = 2795.14
That is with your tires as perfect circles. They then multiply by .97 to account for air pressure and "squish."
That would put your tires at approximately 2710 mm.
As for the shift points, it's personal preference and up to you. Play with it and find what you like.
Senior Member
Joined: Dec 1999
Posts: 1,410
Likes: 0
From: Sunapee, NH
Or you can download the pegasus program, which has a feature that allows you to determine the tire circumference based on tire size and % squish.
Much easier then farting around with all those little equations.
http://dygytalworld.ehost-services13...p/Support.html Look for the link that says "Pegasus v2.01.0575" install and you'll have what you need.
Much easier then farting around with all those little equations.
http://dygytalworld.ehost-services13...p/Support.html Look for the link that says "Pegasus v2.01.0575" install and you'll have what you need.