OK, your OEM tires and gears were the same as mine. With your NEW tires and rims, your effective GR is 3.59, so you've lost a bit there. According to the Gear Ratio calculator in Pegasus, you would need 3.86 gears to get back to a "stock" performance level and, something like 4.10 would probably be better, to counter the additional rotating mass and rolling resistance.
Now, why your custom tune should be less "peppy" than the canned one is a big puzzle. It's possible that Bill tuned it that way for a reason. He can probably adjust for more power though if you're willing to take the hit on economy. This is something you'll have to work out with him. About the only thing you could try would be to raise your max rpm to maybe 5600 (if it's not already there) and your 1-2 and 2-3 upshifts to about 5200. I'd leave the 3-4 upshift alone and I would NOT go any higher than those numbers.
Remember, this is a truck you're driving, not a dragster. It's really not designed for that kind of abuse.
- Jack
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Wed, April 7th, 2010, 06:18 PM
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