Mr. Sandog

He said on another forum that he used to be able to lay rubber for 50 feet or so from a dig, now it's nary a scratch. So it's not just SOTP, there is some real data that reinforces his claim that he's lost TQ.

zippy

I'd like to have seen that in person...

SS_bnoon_SS

iTrader: (3)

LOL! You really are all about the burnout aren't you!?!?!

It's really not back pressure you want in any exhaust system, it's scavenging you're really looking for. The dual 3" system isn't what you should have gone after for a low end torque hauler because the large diameter pipe allows way to much reversion at low flow (low RPM). Step it down to 2.5" pipes, at least off of the manifolds, and you should gain most of the low speed stuff back.

Submariner

PCM fixed? Please explain. Whats the cost and is there any down side to this.

Submariner

Put down a strip three telephone poles long from a dead stop in front of my house a few weeks ago. Now in all fairness I had just washed the truck so the tires were a little wet and it is a slight uphill grade. Once the smoke cleared and the neighbors stopped shaking thier heads I went up to a straight flat dry surface and preceeded to lay down a 50 foot strip. The truck is a 2003 Avalanche w/3:73's, K&N cold air intake and the Superchips tuner set at performance tow.

Quik

iTrader: (7)

pewterssz has a 8.1 dually and his exhaust is stock up to the muffler then it is a 4" diesel muffler with tail pipe that truck pulled a 3 car hauler on the gooseneck down new orleans and never even knew it was back there. no tune and it sure sounded good. of did i forget to say it was a FLowmaster

CHEVY6000VHO

iTrader: (2)

That Superchips programmer isn't really what you need. A custom tune will definately make the 8.1L wake up over that wimpy hand held.
I totally disagree with the guys stating that a dual exhaust set-up will not hurt low-end performance. I've done it in the past to my 2000 5.3L truck. It did hurt the low-end grunt from a in the SOTP feel. You will however pick up more upper mid and high rpm HP & TQ. But it's hard to feel that type of gain once your moving at high speeds in a truck.
I would give a custom tune a try first, but I still don't see more low end power coming back than what you use to have with the stock exhaust set-up. IMO. You will however feel what all the hype is about with custom tunes.
You will see the power in the mid and upper rpm ranges. That's where my LQ9 6.0L picked up more gains. The low-end power was still about the same.
Good Luck.

Jim

1ImperialSS

iTrader: (5)

he said he already retuned after the exhaust....

zippy

I agree that going with dual 3" was way overkill for a 340hp engine. You could just add some more mods to make use of your new exhaust.

Mr. Sandog

I agree...I think a Whipple might be just the thing to cure him of his low-end problems.