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Joined: Dec 2003
Posts: 138
GreyStreet
Member
GreyStreet Dec 17, 11:43pm - #353857 

Member
2000 Toyota Celica GT

Joined: Dec 2003
Posts: 138
TN
Big wheels = problems?

My room mate had a nice Eclipse w/18's on it before he got rid of it. He said after he put the 18's on it, he had lots of transmission problems. Is this common or does he not really know what he's talking about? I cant see why bigger wheels would affect a transmission..any input is appreciated.

"Oh well, oh well. So here we stand. But we stand for nothing" - DJM

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Anonymous Dec 18, 12:21am - #353858 
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I guess it could be a bigger strain on the tranny but i have never heard this as a common problem. The biggest issues i hear is of course the added weight and rotational mass slowing you down. Also, mostly on SUV's and such the brakes may need to be upgraded to slow the larger heavier rims.
Joined: Jan 2004
Posts: 1,230
FloydianSlip6
Specialist
FloydianSlip6 Dec 18, 12:58am - #353859 

Specialist
2002 Toyota Celica

Joined: Jan 2004
Posts: 1,230
Massachusetts
Nope, your friend is absolutely correct. Think of it like this, your wheels are basically gears that are connected to your engine through the axles. When you increase your tire size you do several things.
*raise the cars center of mass
*more kenetic energy gained from bumps
*your tires push BACK on your engine for as much as your engine pushes your tires

It works like this... by increasing your tire size you force your engine to essentially work at a higher gear ratio to move your tires. By updating your gear box like on most heavily modded cars this isn't a problem because more "race designed" gears can compinsate, stock gears however can't always do that. Bigger tires produce more torque when they skid or slip, which causes damage to the tranny. Also because of the larger wheel there is greater angular inertia within the engine. Because larger wheels are often times heavier they have larger rotational kenetic energy, so the engine does the same amount of work as it would for the smaller tires, but much of the work is "wasted" resulting in wear on your engine. Because the center of mass is higher the angular force from any bumps or other things in the road also take more of a toll on your engine than they may if your car was lower. Which is why lowering a car with bigger tires is important, not only for looks.

Hope this answers your question.
Joined: Apr 2004
Posts: 802
Live42day
Senior Member
Live42day Dec 18, 1:48am - #353860 

Senior Member
2004 Toyota Celica GT

Joined: Apr 2004
Posts: 802
WI
That makes perfect sense. Well stated! thumbsup

Originally posted by RICOGT:
i wanted to get the vac gauge because it constantly moves. more of a race feel i think
Joined: Aug 2004
Posts: 993
Celica2k
Jace
Celica2k Dec 18, 4:39am - #353861 

Jace
2000 Toyota Celica GT

Joined: Aug 2004
Posts: 993
Springfield, MO
well shit...more reason to get my car lowered sooner
Joined: Nov 2004
Posts: 365
dansgts
Member
dansgts Dec 18, 4:45am - #353862 

Member
1986 Toyota Celica

Joined: Nov 2004
Posts: 365
Corona, CA
yea, that gives me an excuse to lower my car, just like my car being keyed gave me an excuse to put on a alarm/keyless entry system.
Joined: Apr 2004
Posts: 405
importcarbabe
Turbonator
importcarbabe Dec 18, 4:52am - #353863 

Turbonator
2000 Toyota Celica

Joined: Apr 2004
Posts: 405
Minnesota....Yaa!!!
I am not surprised Mitsubishi are known for Really weak tranny's.

"If you dont like Hair blowers why would you like Turbo's"

Last car '92 Eagle Talon TSI AWD, R.I.P, Current car '00 Toyota Celica GT-S. Next car Fully Built 1st Gen AWD DSM.


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