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Unread 06-16-2010, 12:37 AM   #1
flproject00
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Upgraded stock 16"s wheels to stock 17"s - Anything I should know?

Hey everyone - new member and new wrangler owner here.

I purchased a 2007 Wrangler JK today (super excited) and the first thing I did was upgrade the stock 16" wheels and tires to a set of 17" stock wheels and tires I got second hand. They look amazing but I feel like I am now noticing that it is "hopping" or "jerking" forward and back. As soon as drop it down a gear and accelerate it goes away but when I am cruising it seems to happen.

Considering I have only owned the jeep for less than 1 day it could just be "a jeep thing" that I will get use to. On the other hand, I thought I had read that I might need to have the jeep updated (for lack of a better word) at the dealer to adjust the speedometer and accomodate the larger tires.

Any advice or comments are appreciated!

Jeff

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Unread 06-16-2010, 12:44 AM   #2
LuckRider
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Please describe the "hopping" or "jerking" better. The tires might not be balanced, or you may need an alignment.
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Unread 06-16-2010, 01:10 AM   #3
Warlord2
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sounds like a balancing issue to me if that is all you have changed...
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Unread 06-16-2010, 01:22 AM   #4
JLC08JK
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If the overall tire diameter is different then the computer needs to be "flashed" by the dealer for the proper tire size. You could do this "flash" yourself with the use of the AEV ProCal $150 or the SuperChips Flash-Pack $350.
The hopping/jerking is a separate issue and you should have it checked or driven by someone that can better diagnose or compare to another JK in good order. A better description of this action could help us to narrow it down.
As LuckyRider said the issue could be the tires!

Welcome to the Club and good luck!
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Unread 06-16-2010, 01:35 AM   #5
Armycop
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Do you have the 3.21's/6 Speed? If you have the 3.21's and a weak clutch, it may cause the jerkiness because of the drive-by-wire throttle and the bigger tires. Give it a couple days and get the computer flashed for the proper tire size.
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Unread 06-16-2010, 10:13 AM   #6
flproject00
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Yes it is a 6 speed but the clutch was literally just replaced.

Sorry for the vague description of the "hopping". Lets say I am just cruising at say 40mph in 5th gear, every so often it feels as though I downshifted and then accelerated. The feeling is very subtle. Basically it faintly feels as though there is resistance and then it frees back up. Like I said, it is very faint.

I really think it is just something I will get use to in that it is a jeep and I am more familiar with a 5-speed than a 6-speed. The gas pedal is pretty tight too so when I try to correct the "hop" I typically over-accelerate.

I guess I just wanted the reassurance that changing the wheels/tires didn't require additional tweaking to the jeep.

Thanks again!
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Unread 06-17-2010, 11:48 AM   #7
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I haven't driven a JK 6-speed with the 3.8L V6, but I have driven the 6-speed behind the 4.0L. It sounds to me like it could be the drive by wire that the motor uses. I am sure a JK person will give a better response.
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Unread 06-17-2010, 03:05 PM   #8
OregonVette
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Hmmm... Do you have a lot of experience with a manual transmission?
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Unread 06-17-2010, 07:29 PM   #9
JeepnBeer
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I recently did the same thing (upgraded from the 16's to the 17's), and while I don't have the hopping or jerking, I wanted to recommend the AEV ProCal module to you. It was brought to my attention through this forum, and I have to agree, its a fantastic tool. I was able to purchase mine on ebay for $100, and its truly worth it. I'd encourage you to check out the website, and see everything you can do with the tool. Its money well spent, and will save some trips to the dealer when the day comes that you want to go with some bigger mods. Good Luck!
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Unread 06-18-2010, 02:09 AM   #10
flproject00
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So I think I figured out what it was as the problem has completely gone away. When I bought the Jeep the CEL was on and the dealer said that it would be addressed free of charge. Turns out that it was not a simple "gas cap CEL" that they hoped but a faulty EGR valve. They replaced it today and the engine runs and idles soooo much smoother.

- Thanks for the tip JeepnBeer, I will look into a module.
- As for my familiarity with a MT, don't insult my manhood, that is all I have ever driven! (Haha, jk.)
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Unread 06-18-2010, 02:12 AM   #11
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Good to know you got the problem fixed. Welcome to the Jeep life. There is a ton of info on this site, and you can learn a lot.
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Thanks to SuperWade2 For the 1 Year Upgrade!
Support Our Troops!
ALL WK2 Owners, Click Here
JFI Member #7: Helping out the Scammed
2004 Rubi: Ready to Kill the Chrome!
Totaled and Gone: Mostly Stock 2005 I6 Patriot Blue TJ: Monstaliner (Write-Up) BESRK Rear Bumper, Hella 500s
Do the Jeep Wave :D 0|||||||0 Take 95% of what I say as a joke/sarcasm!-Thomas
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Unread 06-18-2010, 06:03 AM   #12
Armycop
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Glad to hear you got it fixed. I have the Procal too, and it's a pretty useful tool to have in the glovebox. I bought tires last year, had them put on, and then did the adjustment in the parking lot of the tire store, and my speedo was dead on with my GPS speed.
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***Coming in August: LoD rear bumper/tire carrier l Marathon Seat Covers l 4.88 gears l ORE C-Gussets***
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Unread 06-18-2010, 07:05 AM   #13
flproject00
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yeah using the GPS is going to be my first benchmark to see if I need to invest in a procal. My civic was off and added about 5mph so I sort of got use to that. (kind of like having the clock set wrong intentionally to "give you more time") <- pet peeve!

Unless it is underestimating my speed or is WAY off in overestimating then I will likely ignore it.

Question: Would this influence your odometer or is that calculated differently?
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Unread 06-18-2010, 11:22 AM   #14
JLC08JK
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Yes it will affect the odometer and a false reading on that could cause problems with your warranty.
The good news is that the dealer can make the computer adjustment because you are still using a factory available tire size.
You will only need a way to do it yourself if you go to a tire size that is greater than any available from the factory.
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