Please read! Please help! (problems after getting new rims)

Ok problem one. Since vie gotten new rims....

1. Automatic when going down the road and how the Rpms like shift on it's own u kno like... An automatic. When it gets near 45 it won't come down from a shift as if I'm in gear 2 cause it's happened to me
Before n I didn't kno what it was till I looked down n saw I had it shifted on the d2. But thistime it's not likethat n it's stays revvig till I let go of the gas n let it go for a while n does it on it's own with a little jump type push feel. I'm really concerned about this. Do I need a tune up n timing belt have anything to do with it or my aftermarket 17s rims.

2. Driving down the road at 70 n yere was this vibrating towards the back...like every five seconds would be 5 seconds normal then five seconds vibrating...then over n over till I slowed down to get off the ramp.....any ideas as to y?

3. New rims again brakes aren't responding as quickly and as strong when I slamm on the brakes almost ran a stop sign I didn't see it so I slammed on it not to hard but as usual likening would do since I am a rough crazy driver n it kept going n i was pressing it forcefully n took linger to stop with more force...husband says probably the rims since they are a bit heavier n larger than my tiny 14s when I had my 14s everything was good n I never had none of these problem n the day i get my 17s problem are starting to show.....pls dnt letthis be a bad decision... :'-(

bigger rims definitely do contribute to slower braking, I noticed that too, but that's just something to get used to. Vibration could be because you had to bang the stuff in/out on the rear hub? You need to check the balance on your tires and check your alignment. Not sure about the auto transmission problem, but don't see how the new wheels could cause your transmission to have issues. Might be unrelated, just happened at the same time...

I love the rims I hate the fact it takes ne longer to hit 60-70 n barely can get 80 without a whoooole lot of force on the gas pedal :-(

Wow... How heavy are those suckers? I noticed a little bit of an increase in the braking time, but nothing major like not being able to get up to speed and stuff... Maybe that's the reason guy wanted to get smaller wheels?

I think Sergey's right: sounds like a classic tire balance issue causing the vibration.

As for finding you have to use more gas to go fast, remember your speedometer is probably also off a bit. Larger circumference tire than stock means your speedo is now reading low. You're actually going faster than your speedo shows, so you would have to push harder than before to maintain the indicated speed.

You can use this tool to enter the stock vs. new tire size and figure out your speedometer error:

http://wildcatent.freeyellow.com/zookmods/calc.htm

Also, aggressive chunky rims, wider tires and taller ride height increases aerodynamic drag - so you need more gas to go fast.

They do look nice though! :)

Soooo y is no one reading my post!!! I need help people!!

it looks like it was addressed.

If you want to know if its wheel tire related, swap the stocks back on and see if it goes away..

if not then it might be the tune up or something else you suspect.

Quote:

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Originally Posted by MetroMPG

I think Sergey's right: sounds like a classic tire balance issue causing the vibration.

As for finding you have to use more gas to go fast, remember your speedometer is probably also off a bit. Larger circumference tire than stock means your speedo is now reading low. You're actually going faster than your speedo shows, so you would have to push harder than before to maintain the indicated speed.

You can use this tool to enter the stock vs. new tire size and figure out your speedometer error:

http://wildcatent.freeyellow.com/zookmods/calc.htm

Also, aggressive chunky rims, wider tires and taller ride height increases aerodynamic drag - so you need more gas to go fast.

They do look nice though! :)

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is the speed also read wrong on the computer as well?


I am an advocate of having no rims larger than 15" on an aveo, the SRT rims are off a car that is pretty fast from the factory, Oscare could offer some insight though. Seems like all those problems are because of the new rims( it has been addressed), and the transmission may also have a problem with them, as if the car is telling the speed of the car to the tranny, while the car is going much faster

there is not a problem with wheels of any size as far as what the car or computer "thinks"

the issue is feeling the hp loss from the additional weight of the rims, regardless of size. weight also prematurely wears the wheel bearings, etc, as well as making the brakes less efficient. This has nothing to do with wheel diameter, 15" wheels can weigh more than some 17" wheels.

the diameter issue will make the speedo read off, but most likely not the difference she is seeing. the only diameter issue with the computer is if you have abs or traction control with different diameter tires. BUT if the revs and speed sensor are no longer matching the cars learned driving style there could be hesitations etc.

with the last part, thats what i was shooting at lol, i had no idea on how to phase it

Don't phase it, just phrase it... :D :lol:

#-o #-o #-o #-o #-o #-o

i was watching judge judy so i was distracted lol

you got the hots for judge judy?
:oops: :lol: :?

nah she scares the hell out of me

Ok ok when did this turn into helping me out into having the hots for judge Judy!? Lol jk

So how can i tell what is the real speed and see if my speedometer is off?

Quote:

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Originally Posted by MetroMPG

You can use this tool to enter the stock vs. new tire size and figure out your speedometer error:

http://wildcatent.freeyellow.com/zookmods/calc.htm

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Quote:

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Originally Posted by EvySpeedy254

Ok ok when did this turn into helping me out into having the hots for judge Judy!? Lol jk

So how can i tell what is the real speed and see if my speedometer is off?

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What is your new tire size/dimensions? (EG. 205-55r17 etc.)

And what was the size of the tires you took off?

i typically use this one, lets you chose multiple tire sizes at the same time:

http://1010tires.com/TireSizeCalculator.asp

but for visual learners, I kind of am, but tactile as well.. i use this:

http://www.miata.net/garage/tirecalc.html

it shows you the tire size difference in the picture..

The first one is a good calculator, I couldn't get the second one to open.

You could also drive around with a GPS and see the difference between the speed it shows and the speed your instruments show...

The second one is java and the server is slow. Try reloading the page? It always comes up the second time for me.

It actually worked... loaded in less than a second when I just tried opening it.

My new ones are 205/50 r17

N the old ones I'm reeaaally not sure they were 14s n the second number is 65 I think. Not sure. Check my pictures on my car page n see what u think they were

205/50?r17. That'd be huge.

Evy: tried looking up your cardomain page (from the link in your profile), but it give me an error.

http://www.cardomain.com/evyspeedy254

Either way, that size compared to the stock tire dimensions is 9.3% larger :!: :!: :!:

This is the warning it gives you when you're more than 3% (I'm sure you've seen it if you put in those numbers in the first calculator rabbit provided)

Quote:

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Warning! When changing tire sizes, we recommend staying within 3% of the diameter of the original tire. Any more than this and your face the risk of brake failure.

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Mine was 3.03% increase, so I didn't worry too much about it. But 9%?? Can you double check your numbers? 'Cause that's what could be causing your problem if the numbers are right.

By the way... your speedometer would be about 10% slower i.e. when you think you're going 60 MPH you're actually going 66... so it doesn't take you longer to get up to 75 MPH, it's just by that time you're going way faster than that... And your brakes are working a lot harder to stop those wheels...

you will go a little slower though, not anything that is noticed though, butt dynos are no good in this case

or add a CAI or something to counter act the slow feeling =D>

its not going slower, if she is going 65mph according to the speedo (speed limit?) then she can be pulled over for her actual speed of @ 71 mph..

the added weight of the rims probably increases the feel of lack of acceleration, while the larger diameter falsely record a slower speed, so if trusting the gauges while feeling the slower up to speed on the butt dyno, she probably thinks there isa real problem..

the big thing is, everyone hear says the shift points of the tranny are at mph marks (which are probably just in relation to set rpm in gear, hitting the mph the same point every time) but the size difference is going to "change" the shift point in relation to how the car is moving..

i cant belive i never saw this thread #-o
my wheels 215/35/18

as for my wifes aveo, she said she get a whistle on the highway going 55 mph. it didnt do this on the factory 15s.
um and breaking~ i cant tell since i dont daily drive the aveo. but i think when breakin its a lil weaker. same goes for my honda accord. i have 15" and 18" and 20"s and the dubs is strictly cruisin. and breakings also weaker

we wont got outta town on the 18"s wheels [-X