Tech now says I shouldn't change to smaller wheels because of my drive shaft?

Kinja'd!!! "Spanfeller is a twat" (theaspiringengineer)
04/23/2019 at 21:15 • Filed to: None

Kinja'd!!!0 Kinja'd!!! 13

Which sounds odd.

Kinja'd!!!

Note that the original Stinger GT rim has a 46.5 offset, and the site only does whole numbers

The difference in diameter is - 0.21% in the rear and -0.44% in the front.

They said that because of the torque difference, I might risk damaging my car.

To me it sounds absurd, since the difference is minimal, but maybe in the grand scheme of things it proves to be a differential destroyer or something.

Anyway, since everything is expensive when it comes to servicing my car, they also said that it would cost 2000 dollars to get the set of 18in rims and the respective tires.

jesus....


DISCUSSION (13)


Kinja'd!!! Discerning > Spanfeller is a twat
04/23/2019 at 21:22

Kinja'd!!!1

On e of the fun parts of owning an AWD car. The tech may have a point. Anything that alters the gearing front to rear could impact your drivetrain and that includes the diameter of your tires of course.


Kinja'd!!! Spanfeller is a twat > Discerning
04/23/2019 at 21:23

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It’s RWD... But it does have a super fancy LSD. 


Kinja'd!!! Discerning > Spanfeller is a twat
04/23/2019 at 21:28

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Oh you’re rwd? I thought you were awd.

The tech is a fool. Run literally whatever you want as long as the rear left and rear right are the same.

The only thing I would look into is if your changes could impact your stability control. That was a concern for the C5Z I had. You had maintain a certain ratio from front to back.

But that was in part because of the way that GM managed their system.

M aybe the LSD is similar to GM’s BCM and it reads speed at each end of the car, but I wouldn’t expect it to damage the rear diff or LSD. But it could maybe result in an error code or disabling something.

I would check the stinger forums and look for something definitive.


Kinja'd!!! wafflesnfalafel > Spanfeller is a twat
04/23/2019 at 21:34

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T ech is full of BS if it’s RWD - as long as you are not changing ratios between other powered wheels then it makes no difference. LSD reacts to differences side to side on that one axle only.


Kinja'd!!! ranwhenparked > Discerning
04/23/2019 at 21:37

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OK, now I kind  of want to see what a Stinger would look like jacked up in the back, like kids used to do to their old muscle cars in the ‘70s and ‘80s.


Kinja'd!!! CompactLuxuryFan > Spanfeller is a twat
04/23/2019 at 21:57

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Absolutely ridiculous. The car is powering the wheel, not the other way around. $2,000 doesn’t sound that bad for still-not-small factory wheels and tires from a dealer. However, I would just get them somewhere else.


Kinja'd!!! atfsgeoff > Spanfeller is a twat
04/23/2019 at 22:40

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T ech is bullshitting you. Bigger/heavier wheels and tires cause more strain on the drivetrain. By running smaller/lighter wheels, you are reducing stress, not increasing it.


Kinja'd!!! 404 - User No Longer Available > Discerning
04/23/2019 at 23:57

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You just reminded me that I saw some guy with a 328i xDrive running ridiculously wide tires today.


Kinja'd!!! Distraxi's idea of perfection is a Jagroen > Spanfeller is a twat
04/24/2019 at 02:38

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Bull. You can damage the drivetrain with bigger (diameter or width) or stickier tires, since the limiting factor in drivetrain load is what it takes to spin or lock the wheels, and more grip (or more leverage due to bigger diameter) could increase that beyond design tolerance. But it’d take a big increase - it’s not like drivetrain engineers don’t know sticky tires exist, there’ll be substantial margin in the design. You can’t increase the load by reducing diameter or grip. He’s probably confused because smaller diameter equals lower gearing. But that’s at the road - it makes no difference at the hubs.

Whether your ABS, ESC, or tire pressure sensors will be  happy about it is another question


Kinja'd!!! Long_Voyager, Now With More Caravanny Goodness > Spanfeller is a twat
04/24/2019 at 07:15

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I would find a new tech because the one you’re currently dealing with is clearly a moron.


Kinja'd!!! TheTurbochargedSquirrel > Spanfeller is a twat
04/24/2019 at 08:02

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With a RWD car you aren’t going to do any damage as long as you don’t run different sizes left to right. You might confuse your traction and stability control systems if you change the size ratios between front and rear though. I'm sure there are Stinger forums where people have tried different wheel and tire packages on their cars and would know what side effects may possibly occur.


Kinja'd!!! Spanfeller is a twat > Discerning
04/24/2019 at 10:47

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Its a Subaru LSD as far as I can tell


Kinja'd!!! Discerning > Spanfeller is a twat
04/24/2019 at 11:06

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Re ally? That’s interesting.

Yo u should be fine. Even the eLSD’s in AMG’s and C7's, etc. Seem to cope with aftermarket wheels just fine.

Just out of curiosity, is it viscous or friction plate?

shouldn’t impact anything, I’m just curious