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Old March 12th, 2013, 07:34 PM   #1
CHEROKEEMUDMAN01
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Default 2007 silverado info/help

i have a 07 silverado 5.3 flexfuel z71. i put a 2" lift on truck and a set of 32.5 bfg a/t on it. that was going up about 2 tire sizes from stock. i notice while driving it that the trans dont want to shift back a gear to help in moving the truck just holds out in a higher gear. i truthfully didnt think it would change enough to notice the little larger tires but i was wrong. a friend said he thought you can go into computer and change or recalibrate for tire size. is that true? do i have to by a programer to do this and if so who makes a good one for this truck.

also i want to do a k&n cold air intake on it but was told u cant on the flexfuel motor. is that true? i have the engine that turns 4 cylinders off to save on fuel. still only gets 15mpg lol.

thanks guys want to give the truck a little more power for hauling the jeep this summer but dont want to run some crazy program that will end up hurting motor/trans. i have owned it since new and only has 47000 and i plan on driving the tires off it.
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Old March 13th, 2013, 07:24 AM   #2
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My 2007 z71 in stock form pulled about 18 mpg on my daily commute which was mostly highway/highway stop and go and some back roads.

My 2009 z71 stock I am getting about 14-15 around town, I don't use it to commute anymore. I get 18-20 mpg highway on longer trips.

If you are mostly around town driving I think your mileage is about right.
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Old March 13th, 2013, 07:42 AM   #3
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You have a couple options. First you could buy a programmer that will increase power, and let you change the tire size calibration. Second you can take your truck to the dealer and have them change the tire size calibration. The GM scanner has pre set tire size calibrations for common sizes ie: 285/75/16 being the largest, iirc. I never heard of not being able to install a K&N on a flex fuel vehicle. I have had 2 LS powered truck both had a K&N & programmer. I dont know if a K&N is really worth the money for the power increase. The combo of the K&N intake with the programmer is noticeable but not huge. All the info I see about K&N letting more dirt into the engine doesent make me feel at ease either. I would suggest to spend some time searching the GM truck forums before you make a purchase.
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Old March 13th, 2013, 09:41 AM   #4
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You have a couple options. First you could buy a programmer that will increase power, and let you change the tire size calibration. Second you can take your truck to the dealer and have them change the tire size calibration. The GM scanner has pre set tire size calibrations for common sizes ie: 285/75/16 being the largest, iirc. I never heard of not being able to install a K&N on a flex fuel vehicle. I have had 2 LS powered truck both had a K&N & programmer. I dont know if a K&N is really worth the money for the power increase. The combo of the K&N intake with the programmer is noticeable but not huge. All the info I see about K&N letting more dirt into the engine doesent make me feel at ease either. I would suggest to spend some time searching the GM truck forums before you make a purchase.
which programmers are you running and do you think they are worth the $$ ?

I don't necessarily need the extra power for towing, but wouldn't mind it and if there is a reasonable increas in mileage I would consider that a bonus...
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Old March 13th, 2013, 10:07 AM   #5
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Originally Posted by CHEROKEEMUDMAN01 View Post
i have a 07 silverado 5.3 flexfuel z71. i put a 2" lift on truck and a set of 32.5 bfg a/t on it. that was going up about 2 tire sizes from stock. i notice while driving it that the trans dont want to shift back a gear to help in moving the truck just holds out in a higher gear. i truthfully didnt think it would change enough to notice the little larger tires but i was wrong. a friend said he thought you can go into computer and change or recalibrate for tire size. is that true? do i have to by a programer to do this and if so who makes a good one for this truck.

also i want to do a k&n cold air intake on it but was told u cant on the flexfuel motor. is that true? i have the engine that turns 4 cylinders off to save on fuel. still only gets 15mpg lol.

thanks guys want to give the truck a little more power for hauling the jeep this summer but dont want to run some crazy program that will end up hurting motor/trans. i have owned it since new and only has 47000 and i plan on driving the tires off it.
So you're worried about fuel mileage but put a lift kit on it and went up 2 sizes in tire? Or is it that you're worried about power towing but added a lift kit and went up 2 sizes in tire? See the problem yet?

Want your power and mileage back, take the lift kit off and put stock sized tires back on it.
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Old March 13th, 2013, 10:10 AM   #6
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which programmers are you running and do you think they are worth the $$ ?

I don't necessarily need the extra power for towing, but wouldn't mind it and if there is a reasonable increas in mileage I would consider that a bonus...
On my 2000 1500 gmc, I had a hypertech programer w/ K&N FIPK. With the 93 octane tune it did make a diffrence with power & mileage. Not huge power but when pulling a 2 place sled trailer the trans would kick in & out of 4th on the slightest grade stock, after the K&N & programer it had the power to pull in 4th. The best I saw was a true 19 on the highway.
On my 2008 2500 gmc I have a superchip programer, and a K&N FIPK also. My buddy & I take turns pulling his 4 place inclosed trailer to the UP with identical trucks. Mine will hold 5th gear on hills where his will downshift to 4th or 3rd. I know every truck is diffrent, but that is as close as a side by side comapason I can offer. The super chips has 4 power settings- mpg max, tow, 87 perf, & 93 perf. Both scanners I've had would scan DTC's, alow for tire/gear ratio changes and so on. I like the superchips better because of the free up dates, and more program options. Also I got my superchip tuner for free, a customer traded in a truck with it in the console. I set it back to stock, and brought it home . If someone is looking for max power a custom tune would be the best option. As far as worth the money, I'd say the programer is worth it more than the K&N. I haven't really seen a noticable increase in mileage on the 08.

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Old March 13th, 2013, 10:13 AM   #7
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So you're worried about fuel mileage but put a lift kit on it and went up 2 sizes in tire? Or is it that you're worried about power towing but added a lift kit and went up 2 sizes in tire? See the problem yet?

Want your power and mileage back, take the lift kit off and put stock sized tires back on it.
I can't see going from the stock 265/75 tire (which measures right around a 31x10.5 and a 32.5 being ALL that much different on the power scale, unless he has 2.08 gears or soemthing.

That said, I agree, you don't lift a truck and put bigger tires on it if mpg and power are your main concerns.
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Old March 13th, 2013, 10:14 AM   #8
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On my 2000 1500 gmc, I had a hypertech programer w/ K&N FIPK. With the 93 octane tune it did make a diffrence with power & mileage. Not huge power but when pulling a 2 place sled trailer the trans would kick in & out of 4th on the slightest grade stock, after the K&N & programer it had the power to pull in 4th. The best I saw was 19 on the highway.
On my 2008 2500 gmc I have a superchip programer, and a K&N FIPK also. My buddy & I take turns pulling his 4 place inclosed trailer to the UP with identical trucks. Mine will hold 5th gear on hills where his will downshift to 4th or 3rd. I know every truck is diffrent, but that is as close as a side by side comapason I can offer. The super chips has 4 power settings- mpg max, tow, 87 perf, & 93 perf. Both scanners I've had would scan DTC's, alow for tire/gear ratio changes and so on. I like the superchips better because of the free up dates, and more program options. Also I got my superchip tuner for free, a customer traded in a truck with it in the console. I set it back to stock, and brought it home . If someone is looking for max power a custom tune would be the best option.
I just bought a leveling kit and am installing 285's on my 09 soon. I don't expect to lost that much power and mileage, but I figure I will at least slightly notice it.

I am curious if some added power may help in the mountains though.
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Old March 13th, 2013, 10:21 AM   #9
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My 08 came with 245's from the factory, which are my winter wheel/tires. I run 275/60/20 on aftermarket rims in the summer. I will tell you it is a noticable diffrence, especially in 6th gear. The programer helps ofset the tire height with alittle more power.
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Old March 13th, 2013, 10:33 AM   #10
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That's a big difference in tire though (in comparison),
245/75/16 is a 30.5x9.5" tire.

a 275/60/20 is 33x10.8

2" taller and over an inch wider.

I am going from a 265/65/18 to a 285/65/18

31.5x10.5 to a 32.6x11.2

1" taller and just over a half inch wider.

plus you added a 4" taller rim and how much wider/heavier?
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Old March 13th, 2013, 10:36 AM   #11
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Get a hypertech or superchips, they both do about the same thing. Or if you don't plan on changing your combinations for a while then get an actual pcm tune. pcmforless or black bear.

The most you'll see for mpg gain is maybe 1/1.5 with a pcm tune. You'll maybe notice .5 mpg gain with a hypertech/superchips. Really those are good to adjust your tire sizes and compensate your spedo. They do give you about 10-15 extra hp and 10 or so torque but that's with using 93 octane fuel. They have an 87 octane setting but you'll only get 4-5 hp if any.
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Old March 13th, 2013, 10:37 AM   #12
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Get a hypertech or superchips, they both do about the same thing. Or if you don't plan on changing your combinations for a while then get an actual pcm tune. pcmforless or black bear.

The most you'll see for mpg gain is maybe 1/1.5 with a pcm tune. You'll maybe notice .5 mpg gain with a hypertech/superchips. Really those are good to adjust your tire sizes and compensate your spedo. They do give you about 10-15 extra hp and 10 or so torque but that's with using 93 octane fuel. They have an 87 octane setting but you'll only get 4-5 hp if any.
Hardly seems worth it for one tire size increase to even worry about reprogramming any of it.
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Old March 13th, 2013, 10:43 AM   #13
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Yes it is a bigger change in comparaison, but I just wanted to tell my experience for you and the op. For a smaller change like Kickstand's, a trip to the dealer for a reprogram may be good. Most of the GM speedos are 2-3% fast from the factory, so that may make your speedo dead on for speed & mileage.

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Old March 13th, 2013, 10:57 AM   #14
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Yes it is a bigger change in comparaison, but I just wanted to tell my experience for you and the op. For a smaller change like Kickstand's, a trip to the dealer for a reprogram may be good. Most of the GM speedos are 2-3% fast from the factory, so that may make your speedo dead on for speed & mileage.
I am just hoping my change being small enough I don't notice too much of a hit on mileage/power. I just can't stand the noise down stance of the 1500's. Which then leads to empty wheel wells up front with the stock sized tires, a damn endless cycle.
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Old March 13th, 2013, 12:18 PM   #15
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i am sorry for the confusion on the mph thing. i was actually making a joke about the flex motor since with all the stuff that motor does it only gets 15mpg. my 93 ramcharger with a 318 got 15. i am not consirned about the mpg since i drive 5 miles back and forth to work. i would like to correct the prob with shifting points. i ran a volant cold air intake on my 2002 z71 and it made a little diff but not huge.

so going to ditch k&n but i guess i will get a programer for it so is super chip a good one and will i be able to calbrate the tire size?

till i get the money for programer i guess i will call dealer and see what they charge to adj it.

also when i bought the truck in 07 was the last time i checked into cold air intake and at the time i couldnt fine one that was ok for 5.3 flex. i should have looked again b4 i posted that since it has been 5 years lol. sorry guys
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Old March 13th, 2013, 12:19 PM   #16
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stupid question. forgive me cause im not good with the new car computer stuff. the tool that scans codes and plugs into obd2 port can that change tire size?
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Old March 13th, 2013, 12:34 PM   #17
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I am just hoping my change being small enough I don't notice too much of a hit on mileage/power. I just can't stand the noise down stance of the 1500's. Which then leads to empty wheel wells up front with the stock sized tires, a damn endless cycle.
5% on tire size alone not including additional rolling resistance, loss of optimized shift speed and rpm zones in your transmission tables, and wind drag coefficient increase due to the larger gap under the vehicle.........and I don't even specialize in that shit.
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Old March 13th, 2013, 01:37 PM   #18
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5% on tire size alone not including additional rolling resistance, loss of optimized shift speed and rpm zones in your transmission tables, and wind drag coefficient increase due to the larger gap under the vehicle.........and I don't even specialize in that shit.
so you mean unoticeable
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Old March 13th, 2013, 03:05 PM   #19
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so you mean unoticeable
You'll notice at the pump and on the power. You're anal like that
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Old March 13th, 2013, 04:26 PM   #20
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You'll notice at the pump and on the power. You're anal like that
I think I will notice and cry about it at the pump more than I will notice the power loss.

Tires and lift installed tomorrow. So I'll report back, friday I have to go into the office, so I'll get 100 miles of driving in to test out my mileage/power loss
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