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Gryphon Programmer (Disabled)
Edge Product has discontinued the Edge Evolution 2, but we still provide support and tuning for it.

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Old Sat, June 25th, 2011, 06:40 PM
KIRT KIRT is offline
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I also recently added larger tires(today)...265/70R-17 Nitto Terra Grapplers along with new pro comp wheels. I reset the tire size to 2521 after following the recommended formula per my instruction manual. There was a vague reference to possible gear ratio changes due to larger tire size in my manual. Should I be adjusting this value?
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Old Sat, June 25th, 2011, 07:54 PM
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Jackpine Jackpine is offline
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Originally Posted by KIRT View Post
I also recently added larger tires(today)...265/70R-17 Nitto Terra Grapplers along with new pro comp wheels. I reset the tire size to 2521 after following the recommended formula per my instruction manual. There was a vague reference to possible gear ratio changes due to larger tire size in my manual. Should I be adjusting this value?
No Kirt -

You make sure the Gryphon is using the actual Gear Ratio (GR) that is INSTALLED in your truck.

I'm not sure what "reference" you are talking about though. It COULD be that installing larger tires reduces the "effective Gear Ratio" on your truck, which it does. Or, that to regain the "stock GR feel, power, etc." after installing larger tires you would have to install higher gears, which is also true.

- Jack
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Old Sat, June 25th, 2011, 08:56 PM
KIRT KIRT is offline
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Originally Posted by JackandJanet View Post
No Kirt -

You make sure the Gryphon is using the actual Gear Ratio (GR) that is INSTALLED in your truck.

I'm not sure what "reference" you are talking about though. It COULD be that installing larger tires reduces the "effective Gear Ratio" on your truck, which it does. Or, that to regain the "stock GR feel, power, etc." after installing larger tires you would have to install higher gears, which is also true.

- Jack
Thanks Jack....I do think it is talking about changing the actual gears....like I said it was kinda vague
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Old Sat, June 25th, 2011, 09:46 PM
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Thanks Jack....I do think it is talking about changing the actual gears....like I said it was kinda vague
Great! If you've ever had to write a "user manual", you'd soon know how difficult it is to mean what you say to everyone. Larger tires effectively reduce your Gear Ratio. Smaller tires do the opposite.

The Tire Size (TS) and Gear Ratio (GR) settings in the Gryphons are there to make the speedo and odometer read correctly, and to make the transmission shift at the proper points in normal, part throttle shifts. The settings DO NOT restore any "loss of power" you get by upping the TS (reducing the GR). The custom tunes CAN help, but only to a point. I've got other posts in the forum that talk about the effect of increasing tire diameter.

Essentially, a 1 inch increase in tire diameter in the 32-33 inch range is going to cost you about 4% in perceived power. A 2 inch increase costs about 9%. You can really only get that back by changing axle gearing.

- Jack
 

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