Ok, the results are in. I installed my Pacesetter longtubes last week, I am very pleased with the results of the sound of the truck, they got rid of all the rasp and crappy sound, but I am not sure of any performance gains. At the track I normally run at, I have ran a best of 9.46. I went to another track today, which I have run before, best of 9.60, and the best the truck ran was a 9.55. Every time I have ran at this track, I have been very consistantly .2 tenths faster. So I was hoping to run in the 9.2X range. It just did not happen, the truck seems like it has lost a little bottom end TQ. I am not disappointed by any means, the sound is great, but I was hoping for a little performance gains as well. Do you think I might need to have my ECM re-tuned for the longtubes. I don't think that would do very much, but I sure would like to see the 500 bucks I spent on the LT,s give me a little more at the track. Any Ideas!!

 

I ordered my Wester's tune after my LTs were installed so I don't know if tuning is necessary for you. I'm curious, do you have a single or dual exhaust? What size pipes?

 

What was your MPH during those runs vs without the headers?

 

tune will help, have you given the pcm time to learn the new trims?

 

I have the stock 2.75 single exhaust, from the custom y pipe back. MPH was right at 75 on the 9.46, I don't really know what the MPH was today, the track is small and does not show anything but the ET. They don't even give you a time slip unless you go to the tower and get it, then you have to walk over and dig through a stack and find yours so I did not get one. The pcm has been in the truck for about 3 months so I know it has had time for the re learn period. I think I will have the pcm sent in for a new tune just to make sure every thing is good. I am going to have the factory pcm tuned for my current mods, right now I have a different pcm in that I got from Jesse, and I have the SES light on for the crank position sensor relearn. The dealer wants 65 bucks to reset it, and I can get Jesse to tune the original pcm for 35 bucks I think. I will try it and see what happens. And I will go to my normal track so I can get some more acurate numbers. Thanks for the input.

 

Definite retune!!

 

You may have lost torque and consequently lost time in the 1/8th but would gain hp and probably have improved times in the 1/4.

 

You are goin to want to get that retune very soon.It will help more than you know.Your motor is tuned for a stock exhuats setup and now you are letting alot more through the system.Even with the stock exhaust after the y-pipe you should be getting alot more power than that.
I did my exhaust/headers last...i still had better 60ft times and.2tenths fast quarter mile times.This was the last mod i did and as we all know the more power and mods you get the faster you go =the less differance a single mod can make in the end.So basically if i ahd done them first instead of last they mgiht have dropped me more like 4-5 tenths.
I also never lost any bottomend torque.So i would get it retuned soon bro.

 

I also recommend a retune. It could probably be leaned out.

 

sounds unanimous for the retune