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Old 12-11-2010, 10:48 PM   #1
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should i regear mileage is bad lol

hey yall i recently bought a 2010 jk and had a 4'' rustys lift and 33''/20'' tires and wheels installed and fuel milage is averging 9.6 city and 11.1 on highway (not good) what gears should i go with and will they void the factory warranty?

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Old 12-12-2010, 01:09 AM   #2
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What type of transmission do you have? It makes a difference for gearing

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Old 12-12-2010, 05:58 AM   #3
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Did you recalibrate your speedometer when you added the larger tires? If not then your MPG calculations will be off.
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Old 12-12-2010, 08:04 AM   #4
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The way I understand it....Usually, mods only void the warranty if they have something to do with problem you are claiming warranty work on.

Such as.....
Changed gears, but having some sort of major electrical problem.
There's not much of a way the gear change could've caused the electrical troubles.
That's not to say that the dealer wont do all in their power to prove otherwise.
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Old 12-12-2010, 09:05 AM   #5
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Quote:
Originally Posted by daggo66
Did you recalibrate your speedometer when you added the larger tires? If not then your MPG calculations will be off.
Which could mean it's even worse. He may not really want to know
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Old 12-12-2010, 09:08 AM   #6
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Originally Posted by dfwislander View Post
Which could mean it's even worse. He may not really want to know
No, it means it's better. If his speedo is off it's reading fewer miles traveled due to the larger tires, therefore he thinks he's going shorter distances using the same amount of gas.
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Old 12-12-2010, 09:32 AM   #7
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Changing gears will void your warranty on your axles, driveshafts and probably your transmission and transfer case.
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Old 12-12-2010, 09:42 AM   #8
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Quote:
Originally Posted by Lithium Lotus
Changing gears will void your warranty on your axles, driveshafts and probably your transmission and transfer case.
Not if you have your local dealership approve it first, or use mopar parts for the swap.
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Old 12-12-2010, 09:45 AM   #9
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Quote:
Originally Posted by mattblack38
hey yall i recently bought a 2010 jk and had a 4'' rustys lift and 33''/20'' tires and wheels installed and fuel milage is averging 9.6 city and 11.1 on highway (not good) what gears should i go with and will they void the factory warranty?
I do wonder about whether you've fixed your speedo. Going to 33" (one inch above stock) drops you to around 10 mpg?? That almost can't be right. Jeeps aren't economy cars by any means, but that's really, really low.
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Old 12-12-2010, 11:18 AM   #10
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Originally Posted by Lithium Lotus View Post
Changing gears will void your warranty on your axles, driveshafts and probably your transmission and transfer case.
according to the "Magnusson-Moss Act" the dealer will have to PROVE that the gear change caused failure in those areas....the gears don't give you more or less power(simple engineering principal), they just change the point at which power is yielded i.e. higher or lower RPM. So in this situation the dealer would have a rough time proving that the gears caused the issues, but you know as well as I do they'll try everything to screw you over if you make them mad
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Old 12-12-2010, 12:09 PM   #11
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hey guys its an auto and no i havent had the speedo done yet all my local shops have been closed
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Old 12-12-2010, 12:29 PM   #12
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I get high 15s and low 16s (mpg), with my JKU auto on big 33s and my speedo is calibrated-

High 12s and low 13s (mpg), in 4hi/4lo off-road

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Old 12-12-2010, 01:07 PM   #13
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So how do you calibrate the speedometer? I just replaced my stock 30s with 33s. I've noticed the GPS says I'm doing about 8mph faster than the speedometer. I have a auto with 4.1 gears. Would it be worthwhile to buy one of those Superchips gizmos?
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Old 12-12-2010, 01:13 PM   #14
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Quote:
Originally Posted by 07JK-ARB
So how do you calibrate the speedometer? I just replaced my stock 30s with 33s. I've noticed the GPS says I'm doing about 8mph faster than the speedometer. I have a auto with 4.1 gears. Would it be worthwhile to buy one of those Superchips gizmos?
I have an auto 07 2dr with 4.10 gears and i noticed a HUGE improvement in throttle response, smoother shifting, and i can change tons of things that make offroading better i.e adjusting fan kick temps, rpm shift points, and you can recal the speedo for your tires. I wont make the bold claim that mileage is better from it because i honestly dont care about mileage.
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Old 12-12-2010, 01:15 PM   #15
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Quote:
Originally Posted by 07JK-ARB
So how do you calibrate the speedometer? I just replaced my stock 30s with 33s. I've noticed the GPS says I'm doing about 8mph faster than the speedometer. I have a auto with 4.1 gears. Would it be worthwhile to buy one of those Superchips gizmos?
Yeah, Superchip, AEV ProCal, or something similar.
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Old 12-12-2010, 01:20 PM   #16
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AEV Procal Module is ½ price of the superchip and will do everything -except alter the "tune" which may/maynot be beneficial-

I know the AEVPM works very well !!

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Old 12-12-2010, 01:39 PM   #17
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Quote:
Originally Posted by JIMBOX
AEV Procal Module is ½ price of the superchip and will do everything -except alter the "tune" which may/maynot be beneficial-

I know the AEVPM works very well !!

JIMBO
I dont normally argue with you jimbo, but i doubt the procal can do half the things that the superchips can do. Guys like me and you havr never had an issue with the power on our jeeps because we have a good gear ratio, for guys with 3.21 and 3.73, the flashpaq could make all the difference.
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Old 12-12-2010, 01:58 PM   #18
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Originally Posted by ncossey View Post
I dont normally argue with you jimbo, but i doubt the procal can do half the things that the superchips can do. Guys like me and you havr never had an issue with the power on our jeeps because we have a good gear ratio, for guys with 3.21 and 3.73, the flashpaq could make all the difference.
Heh Heh, not cause I'm always right, but because everyone knows that I'm mentally UNSTABLE, due to (High Remgen) count-and they know if I get upset, Ill go out and kick the jeep !!

You're probably right, BUT I've heard so many pros/cons on the superchips though, so ya lays yer money and takes yer chances !!

I got the AEVPM, because of my 4.10 gears and I didn't care about the mileage, so it did all the other stuff too-

Cheers

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Old 12-12-2010, 02:56 PM   #19
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You could go with a Aeroforce gauge. Cheaper then the superchip and doesn't lock to one jeep. You can set tire size , gear ratio, etc. Check it out. I will say the Superchip is nice. You can adjust the throttle response along with tire size and gear ratio.
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Old 12-12-2010, 03:15 PM   #20
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lets face it....we all drive engines surrounded by the least aerodynamic brick-shaped body on the planet. Mileage will never be worth a flip until they put the so-called jesus-engine in our jeeps....here we go! the ALL NEW FANCY SMANCY pentastar will be the cure-all for all our mileage and power woes. it'll get 4 million miles to the gallon and have 6 billion horse powers @ 1rpm. Heck, it'll be so good we might even park our jeeps and start walking over rocks for fear that the power emanating frome our wheels might split the rocks into multiple tiny shattered pieces! all other engines will cease production and our god-like status will be recognized worldwide. what I'm trying to say is it's a jeep and mileage sucks in jeeps....all of them(and the pentajoke won't mean jack to me, cause my minivan engine does exactly what I want on and off the road)
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Old 12-12-2010, 03:17 PM   #21
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Quote:
Originally Posted by ALs07
You could go with a Aeroforce gauge. Cheaper then the superchip and doesn't lock to one jeep. You can set tire size , gear ratio, etc. Check it out. I will say the Superchip is nice. You can adjust the throttle response along with tire size and gear ratio.
How does the aeroforce gauge store your old ecm programming for when you need to take it to the dealer for servicing, just curious with multiple vehicle use.
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Old 12-12-2010, 04:53 PM   #22
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I use the AEV ProCal - bought it at the dealership. They said no warrantee issues using it.

OTOH - they don’t like “performance” programmers and may/will not warrantee transmission issues if you use one. I know you can re-program it back to factory before you take it to the dealer. I also heard that they can tell it was reprogrammed. I also heard that you can disconnect the battery for 15 minutes and then drive it around for 20 miles and then they can’t tell you re-programmed it…

After my new tires and gears I just wanted my speedo to be correct, which by the way can void your warrantee if it isn’t, so the ProCal was perfect for me.
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Old 12-12-2010, 04:55 PM   #23
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How does the aeroforce gauge store your old ecm programming for when you need to take it to the dealer for servicing, just curious with multiple vehicle use.
It doesn't. You are supposed to remember the factory setting and re-program it back yourself.
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Old 12-12-2010, 04:55 PM   #24
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Quote:
Originally Posted by InfernoGirl

No, it means it's better. If his speedo is off it's reading fewer miles traveled due to the larger tires, therefore he thinks he's going shorter distances using the same amount of gas.
It was a joke. I just remember after lifting my 02 figuring out the actual gas mileage after the lift and wishing I had remained in the dark
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Old 12-12-2010, 08:40 PM   #25
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After my new tires and gears I just wanted my speedo to be correct, which by the way can void your warrantee if it isn’t, so the ProCal was perfect for me.[/QUOTE]

how can an incorrect speedo void warranty? all speedos have a plus/minus accuracy of about 1-3mph from the factory.....check with gps and you'll see what I'm talking about, and that's why police are reluctant to write a speeding ticket for 1-3mph over the limit(a good lawyer and professional can burn an officer over a petty issue like this in court). like I said earlier "Magnusson-Moss Act" prevents dealers from sticking it to you as long as your willing to put up a fight.....the dealer must PROVE that the failure was caused by"Said" part....and I don't know of anything that is mechanically affected by the speedo unless it's off by a substantial margin(as in 20+ mph)
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Old 12-12-2010, 09:12 PM   #26
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how can an incorrect speedo void warranty?...


Easy. They don't say the speedo is 100% correct from the factory, and if it's operation hasn't been modified then they are OK with it. My written warrantee states that they won't fix anything if: "the odometer (mileage) has been stopped or altered and/or the vehicle’s actual mileage cannot be readily determined". If you change the tires and or/gears and don't re-calibrate your speedometer, you odometer (mileage) will have been modified and there's no way they can readily determine your actual mileage. I'm not a lawyer, but it would be hard to argue that your mileage is correct, when in fact it will be way off.
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Old 12-13-2010, 08:11 PM   #27
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Red face Great - clear as mud!

Seriously All - thanks for the information. It's as clear as the mud we drive through! Any idea what a dealer would charge to synch the speedo with the new tires? Maybe I just don't need all the other stuff. Thanks for the help as we're new to all this. Before and after pics - ARB bumper, Old Man EMU lift, Nitto Terra Grappler 295/70/17s on Pro Comp Xtreme Alloys Series 7105 Black Finish. It's momma's mid-life crisis ride!
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Old 12-13-2010, 08:14 PM   #28
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...Any idea what a dealer would charge to synch the speedo with the new tires?...
Last I heard they can't sync anything more than stock tires. Maybe things have change though...
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Old 12-13-2010, 08:25 PM   #29
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Wink

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Last I heard they can't sync anything more than stock tires. Maybe things have change though...
Thanks.

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