This past saturday I climbed under the truck and Ill be damned if my exhaust didn't fall off
Luckily, I had a replacement in the garage. After some cussing and some work with the hammer I "repaired" my exhaust. Holy smokes - the difference is huge! I am running an SCT with KEM's 250 - I took my pipes to have the sensor bungs welded and had Mike write the tune to bypass the sensors - made the "fix" quite a bit easier. I am lucky that my old man has done well for himself and likes his sports cars - I have driven Vipers and ZO6's - he is now on a ZR1 - I say this for this comparison: this 8500 pound truck is more fun than that ZR1 - a truck this big/heavy should not be able to move like it does now.
I have no idea on the mileage as of yet - I need to keep my foot out of it
I'll be honest though - I do get a little nervous each time I put my foot in it - slightly nervous about HG but really just in disbelief that these trucks can make such big power off of a "simple" tune.
Now, I do have a few questions for those that are tuned.
-Idle - mine is at about 900RPM's - is that normal because it wears my right leg out keeping my foot on the break at a light.
- I have always referred to it as the "engine rollover" when you shut the truck off it feels like the motor is rolling in the engine bay - I don't have that anymore it shuts off like a gasser - doesn't bother me either way.
- When using CC set at 40 -45 it will not maintain a constant RPM but accelerate then RPM's fall off like they would when you take your foot off the throttle then it will immediatley rev back up to maintain spedd - on a perfectly flat road it is not a problem but those are few most roads have some sort of incline to it so the truck is constantly revving up and letting off -does that make sense?
Last thing is my boost gauge - it constantly reads 1-2lbs - it never rests on the "0" line even at idle - I am guessing that has something to do with the idle being 900 RPM's?
Other than those issues the tune is great and I am hoping when I can keep my foot out of it that I see an increase in mpg's - we shall see.