Okie Newb

[jimmykawi]

Hey guys, great site, ive been reading here for a while, but didnt feel worthy of posting until i got the nelson tune. well i got it friday and i love it. one question though, why do i still lose to my friends truck? I have an 04 ecsb z-71 with 58,000 miles, with intake, exhaust, e-fans, vette servo, nelson 91 tune and a tb bypass. he has an 04 ecsb z-71 105xxx miles and the same exhaust as me and a superchips 91 tune. the only thing is, i have 285/75-16 tires, he has 265/75-16. he slowly but surely pulls on me to 100, then i take off and leave him. why with so few mods does he come out ahead? sorry for the long first post!

[ducky]

not sure. I dunno give it about a week and go again? How many miles have you put on the tune so far?

do you have a front end replacement or anything of the sort?

[RedHeartbeat]

he's got a little on you on the gearing. Have you weighed both trucks?

[jimmykawi]

No front end replacements or anything heavy like that. how does he have any gearing on me? i assume you mean in the tires. i do love the tune, it feels very strong and according to the g-tech, with the servo and tune i went from 16.8 to 15.5 its impressive, i was just a little dissapointed. i put the pcm in friday and i put 450 miles on it so far so i think its learned all its going to. i figured with my other little doo dads that it would make up for the tires.

[ChevyLee]

maybe your truck doesn't like the intake? i lost power when i put one on my v6 lol

wut size motors do you guys have?

[RedHeartbeat]

Yeah, smaller diameter tires are like putting lower gears in. Kind of like going from 3.73s to 3.83s. That gives you more pulling power. Take both of your trucks to a truckstop or grain elevator that has scales and get them both weighed on the same scale. A full tank of gas vs. an almost empty tank makes a world of difference, also. Every 100 lbs equals .100 slower in the 1/4 mile, as a general rule of thumb. Your larger tires add some weight.

[jimmykawi]

we both have a 5.3, and when we raced today i had 1/8 tank of gas, i guess maybe i need some smaller tires or some 4.10s. i'll try to get us both weighed in and see just how much heaver i am. maybe somebody could just donate a trick front mount to my cause...

[foggy]

Do you have the same gear ratio's?
Some trucks came with 3.42 while others came with 3.73.

[jimmykawi]

good question, i have been assuming that we both have 3.73s how can i find out for sure?

[ducky]

theres a code in the glovebox. I cant remember what the code is though.. Maybe one of the guys can chime in.