Got a 2005 Avalanche with exhaust and air filter mod.
When the K&N was put in and the dual exhaust added the gas mileage went to crap -2 to -3 miles to the gallon. Can it be tuned to get the mileage back with HPTuners?
Got a 2005 Avalanche with exhaust and air filter mod.
When the K&N was put in and the dual exhaust added the gas mileage went to crap -2 to -3 miles to the gallon. Can it be tuned to get the mileage back with HPTuners?
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
thats wierd it would go down. why is that?
1951 3100
1984 C10
Could be a heavy foot.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
For real. they say that K&N adda mileage. Either heavy foot or you f&^%cked something up.
off topic, but have your ran it in the 1/4 yet?
just wondering,
thanks,
allen
Nelson Performance
FastestTruckList.com
NP on Facebook
Youtube Channel
'94 Chevy Truck: 8.9 et, 408 twins
maybe you have a bad tank or 2 of fuel?
07 SILVERADO CLASSIC 2500 HD 4x4 CREW CAB LT3 DURAMAX LBZ/ALLISON 6 SPEED 5'' MBRP Turbo back exhaust 6'' TIP /NO CAT- NO MUFF/ AFE Intake/ EDGE HOT JUICE /MERCHANT AUTO STG III Built Allison/P I ConverterTTS Twin Lift Pumps. Tierod sleeves/Cognito braces.17x9 Moto metals_______ Old Truck ,04 Z-71/Turbocharged,/cam/stall/Zippy Built TRANS/Nelson Tuned------
It's my father in laws and no, it hasn't been run on the track and nothing is f'd up. I was just as astonished as you guys! This truck only has 1800 miles on it. We did put some Boyd Coddington wheels on it but he kept the 17" and stock tire height. We filled the tank up with gas again and he still says it's lost mileage. Pretty strange huh? As far as a heavy foot, he probably hasn't had it over 70 mph
97 GMC, 2002 LS6.
1991 GMC Syclone #1428
you lost a little back psi with the duals and opened up the intake with the k&n....if you woudda just installed the k&n it prolly woudda gained a little but when you lost some back psi it took it away......sorry....you can get some back by getting rid of some of that tm and a good tune...
'13 silverado LT...stock
'11 lt 4x4 z71..tvs1900
'01 gmc twins 6.0 jakes 400 ladder bars w/ coilovers tuned by nelson performance
Same thing happened to my 2004. I added the Volant and duals and I lost a couple. But I think mine was directly related to the increased pressure of my right foot in response to loss of backpressure on the 5.3L. So I did the sensible thing.
I bought a supercharger!!!!!!! 3;
The supercharger and tune added around 3 mpg with better fuel tables.... For about a day. I just couldn't get rid of that twitch in my right foot!
Seriously, the tune can do nothing but help....
2004 Nekkid Z71 Avalanche with increased traction, enhance aerodynamics, and upgraded airflow.....
Just get a tune for it from Allen!
Posting Permissions
Reply With Quote
