shouldn't I have won???
 

6.7l 07.5 dually, stock with 120000kms, but with a code p2579 vs.
5.9l 06 2500, stock with 65000kms.

5.9l wins all the time. Didn't matter what I tryed boost lauch, 4x4, tow haul on or off, whaterver couldn't keep up.

How do you know its stock? And your dually weighs a good bit more.

i had a stock 5.9 with a straight exhaust keep even with my pickup the other day and mine aint so stock. maybe he got a fast one

He's a good friend of mine, him and I went through the truck with a fine tooth comb. It's stock. Even with the weight I would have thought the 25 extra horse and the 40 ft lb's of tourque would have beat him. Maybe something wrong with mine other than just that code?? Would the code effect the performance of my truck that much?? p 2579 Turbo charger speed sensor circuit performance.

i hate to say this but, power to weight ratio,you may have 25 extra horsepower and 40 ftlbs, but that doesent mean you will win, his is a good 500-1000 pounds lighter and also its not just the truck its the driver aswell,a truck with 10k mods could be beat by a truck with only 5k mods aslong as the driver knew what he was doing.

best bet is to swap trucks and run again, if he beats you in your own truck you need more practice,but if you beat him then its your truck.

I'll invite you down next time and you can show me how to drive. We swaped back and forth the result was the same. Just have to live with the results I guess. I posted this to see if anyone else has had the same experience or if this is normal. My truck is usually hooked on too a 35' 15000gvwr living quarter horse trailer.

How much do both trucks weigh?

when i was looking to buy a truck. i drove a new 07.5 truck. my 08 that i bought runs better. i think they are a difference in computer but smarty will bring that out.

Weight is huge also gear ratios and different trans gearing as well. Lots variables to try to figure out.

i dont want any hard feelings, i was just saying that stuff happens,everyone has room for improvement.

your truck should have kept up, but what about your rear gear ratio and his? are they the same?

It takes A LOT more than 25 extra HP to overcome the weight differences in your truck. For example. My truck makes a little over 700HP but weighs nearly 11,000 pounds and runs in the mid 13s in the 1/4. My buddy had a truck making around 726 and ran 11.77 in the 1/4 , but his truck was around 8000lbs . Main difference is WEIGHT. In order for me to run with him I would have to be putting down around 1100-1200 HP at the wheels VS his 726. If I use some spray I would be there with no problem.

Spinning 2 extra wheels and tires, will affect quite a bit to.

In drag racing, weight is a huge issue. Every 200 lbs is roughly equivalent to .1 sec difference in ET. And every 14hp is roughly equivalent to .1 sec difference in ET. So if your 2 trucks were the same weight and you had 25hp on him, then provided you both had equal traction and equal skill, you would beat him by roughly .2 of a sec in the 1/4. But if he were 400lbs lighter, and actually, it would be closer to 350lbs lighter, you would be dead equal.

This is also assuming that your increased power is more power to the wheels. Based on stock power rating being at the crank, you are probably only 20hp higher than he is. So to be equal, he would need to be roughly 300lbs lighter than you. I guarantee that he is more than 300lbs lighter than you, and there in lies your problem. If like others have mentioned he is closer to 1000lbs lighter, depending on how much fuel you both have, he will have a pretty decent lead over you every time. Probably close to .2-.4 seconds which is a lot.
Sean

If your shaft speed sensor isn't working then more than likely your VGT isn't working either. Which will cause horrible spool up.

:choochoo:dont know if this helps but last night i ran a duramax dually with soem kind of chip cause he smoked some vs my 05 5.9 with only mods below on 70 setting on JR and he couldnt gain an inch i had to keep braking lol