Frustrated in Texas!!

[Tuscany FTX]

Here is the deal. My truck is a "Turd", and I can't figure out why. I have an 06 F150 4x4 that is a conversion thru Ford by Tuscany. When I bought the truck, I was immediately not happy with the POWER. The only performance Mods on the truck at the time was 20" wheels/tires,SI/DO exhaust, and a leveling kit. My next door neighbor has same truck except 05 and stock wheels/tires. His truck will SPANK mine. For example 0-60 he is in the low 9's, I was low 13's, but he had CAI,Gryphon w/ Custom Tunes by PHP. Since then I have put a Banks CAI, and the Gryphon with Custom Tunes by PHP. When I received the Gryphon w/ "Canned Tunes" the truck definetly drove a bit better, but 0-60 was still in the High 11's. So, I had hopes of when I received the "Custom Tunes" that the performance would improve more. "NOT". I received the "Custom Tunes" and got an Custom 87 Performance and Custom 87 Tow. The truck runs GREAT on the freeway, very smooth, but still NO POWER. The best 0-60 I can muster w/ Custom 87 Tow is a 12.8, which is LOWER than the canned tune 0-60. I am at a loss! The truck sounds like it is going to take off, but it just doesnt. Any help or advise would greatly be appreciated. I also posted this on the F150 forum so if you see it twice it is me. Thanks again.

[88Racing]

What gears do you have?
What gears does your neighbor have?
What size tires on those 20's?
Just some more info needed.
Peace!

[88Racing]

One more question: What motor and do both trucks have the same one?????

[Tuscany FTX]

To my knowledge we both have 3:73 gears. We both have 5.4l engines. The only known difference is he has 17" stock wheels,tires, and I have 305/55/20's. I now have the Nitto Trail Grapplers, but before I was running Toyo Open Country A/T's. Thanks 88 for looking into my prob!

[Tuscany FTX]

88! One more thing. It is like NIght and Day difference. I wouldn't be concerned if it was just a little bit, but it is drastic enough to make you think something has got to be wrong with my truck. When I floor it (WOT) it builds RPM and sounds great, but it is like it doesn't engage. Not that the tranny is slipping or anything because all feels smooth, but it just doesn't go. His puts you in the seat and easily leaves me by 5-6 truck links.

[shotgun]

Boy - that sounds like the torque converter isn't locking up.

Are you monitoring it on the Gryphon?

EDIT:
From page 9 of the manual

COM GEAR

Visual gear indicator: Current transmission gear and torque converter lockup state

[88Racing]

You don't need to sell the whole wheel package:
http://forum.gopowerhungry.com/class...e-package.html

Just swap out the tires to 275/55r20's.
Not unless you still have your stock 18's rims+tires?

[Tuscany FTX]

Originally Posted by 88Racing

You don't need to sell the whole wheel package:
http://forum.gopowerhungry.com/class...e-package.html

Just swap out the tires to 275/55r20's.
Not unless you still have your stock 18's rims+tires?

HA!HA! I am still running 305/55/20's. I just bought new wheels and tires.
Thanks,

[Jackpine]

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

[cody994x4]

why are yall racing f150 4x4's? take him off-roading and see who 'wins' lol

the difference has got to be:
1.)aftermarket rim/tire weight....you are heavier than ur neighboor
2.) leveling kit...you are most likely less aerodynamic...his nose sits lower, you have more 'drag' on your setup
3.)same trannys? same shift points? same final drive ratio?

if u're trying to make ur 4x4 fast....start by re-gearing, then exhaust, then a turbo!

g/l