car is swaying

[Snowwhite]

if they're squared you should see if 265/35 fits in the front as well, that'd make the most sense if it fits.

 

[Realist_Sting3r]

Just got the alignment done yesterday and it feels more stable now on heavy acceleration because before my left toe adjustment was out of spec. But the car still sways a bit when I floor it. The car is tuned by lap3 1.5 running meth. So I may need more of a sticky tire. What you guys think?

And this only started happening when I changed to a lighter rim than stock...

 

[Volfy]

I wouldn't fixate on the light weight wheels. If anything, less unsprung mass will help reduce wheel hop, which in turn helps to keep the tire down in contact with the road surfaces.

Sounds to me like you changed more than just the rims. You also changed the tires as well. What tires did you go with? What pressures did you set those new tires to?

 

[Realist_Sting3r]

I wouldn't fixate on the light weight wheels. If anything, less unsprung mass will help reduce wheel hop, which in turn helps to keep the tire down in contact with the road surfaces.

Sounds to me like you changed more than just the rims. You also changed the tires as well. What tires did you go with? What pressures did you set those new tires to?

Same ole michelin pilot sports 4s all season but 265 in the rear and 235 for the fronts and they're around 34 psi once warmed up. Recently had subframe bolts installed as well and had them torque to spec

 

[Volfy]

Same ole michelin pilot sports 4s all season but 265 in the rear and 235 for the fronts and they're around 34 psi once warmed up. Recently had subframe bolts installed as well and had them torque to spec

That's not too bad. Might just be the open rear diff. Your AWD might transfer some of the torque to the front, but the rear axle can still be a one-wheel-peel when you really put the hammer down. In that case, having substantially lighter weight wheels could possibly allow the loose side to spin up faster and break traction quicker. Getting stickier tires doesn't resolve that issue, as the tire on the side that does stick will stick even better, only to help send more torque to the other side. Not to say heavy rims solves your problem either; their laziness to move helps to mask this open-diff problem a bit but causes issues in other performance aspects.

 

[vipeboy2000]

That's not too bad. Might just be the open rear diff. Your AWD might transfer some of the torque to the front, but the rear axle can still be a one-wheel-peel when you really put the hammer down. In that case, having substantially lighter weight wheels could possibly allow the loose side to spin up faster and break traction quicker. Getting stickier tires doesn't resolve that issue, as the tire on the side that does stick will stick even better, only to help send more torque to the other side. Not to say heavy rims solves your problem either; their laziness to move helps to mask this open-diff problem a bit but causes issues in other performance aspects.

He has an indigo so has an lsd with awd . The issue may be what I've been posting where his rear tires are almost an inch taller than the fronts if the sizes are what he says they are on them .. 235 35r19 fronts and 265 35r19 rear means the rears are too tall vs front for the awd.

 

[Realist_Sting3r]

That's not too bad. Might just be the open rear diff. Your AWD might transfer some of the torque to the front, but the rear axle can still be a one-wheel-peel when you really put the hammer down. In that case, having substantially lighter weight wheels could possibly allow the loose side to spin up faster and break traction quicker. Getting stickier tires doesn't resolve that issue, as the tire on the side that does stick will stick even better, only to help send more torque to the other side. Not to say heavy rims solves your problem either; their laziness to move helps to mask this open-diff problem a bit but causes issues in other performance aspects.

Good points but you know what, I just looked at my stock front tire spec and my profile size was a 40. Now its a 35. That may be the culprit

 

[Realist_Sting3r]

He has an indigo so has an LSD (Limited Slip Differential) with awd . The issue may be what I've been posting where his rear tires are almost an inch taller than the fronts if the sizes are what he says they are on them .. 235 35r19 fronts and 265 35r19 rear means the rears are too tall vs front for the awd.

Yep I just realized I went with a smaller profile size in the fronts. So I may need to change the profile spec on the fronts.

 

[Kodiack]

I would do that pronto.....like it was mentioned earlier different outside diameters from front to back will destroy your transfer case...the gears within it are set to run at the same rotation rate and unless you are square you are at a different rotation rate.

 

[Snicklefritz]

unless you are square you are at a different rotation rate.

tire od is the determining factor, not wheel width difference.

 

[vipeboy2000]

tire od is the determining factor, not wheel width difference.

I'd assume by square, would mean tire size and wheel size is the same.. In this case it sounds like the wheels are square but the tires are staggered and smaller od due to same aspect ratio but narrower width tires.

 

[Volfy]

He has an indigo so has an LSD (Limited Slip Differential) with awd . The issue may be what I've been posting where his rear tires are almost an inch taller than the fronts if the sizes are what he says they are on them .. 235 35r19 fronts and 265 35r19 rear means the rears are too tall vs front for the awd.

Didn't know the Indigo AWD has LSD. Good deal. Mine didn't come with an LSD, but I bought one off ebay and installed it. Well worth the work.

265/35R19 rear is okay, but 235/35R19 front is no bueno. 235/40R19 is definitely the way to go for a staggered setup.

That leads to another issue. Regardless of the aspect ratio (35 vs 40), 235 tire is quite a stretch on 19x9. IMO, if you want to go with a staggered tire setup (235+265), you'd be better off with 19x8.5 front 19x9 rear.

If you want to go square, all 4 tires and wheel should the same.

 

[Realist_Sting3r]

I'd assume by square, would mean tire size and wheel size is the same.. In this case it sounds like the wheels are square but the tires are staggered and smaller od due to same aspect ratio but narrower width tires.

yes the tires are staggered and the rims squared 19×9. Just ordered a new front pair of tires of a profile size of 40 instead and hoping that was the culprit all along.

 

[Ohiocruiser]

Mine didn't come with an LSD (Limited Slip Differential), but I bought one off ebay and installed it. Well worth the work.

More details please? Did you replace the whole rear unit? No problems with abs or electronics?

 

[vipeboy2000]

More details please? Did you replace the whole rear unit? No problems with abs or electronics?

since it's just a mechanical lsd, probably no issues, i know some others have done similar swapping out the diff with no issues. Just means esc will have to intervene less.

 

[Volfy]

More details please? Did you replace the whole rear unit? No problems with abs or electronics?

I posted some notes here:

https://genesisowners.com/genesis-f...and-additive-for-lsd.38084/page-2#post-513103

G70 - jack points?

But how do you swap out the floor jack with the jack stand? If one of the tools (either the jack or the stand) is using the pinch weld, then the other can't because the weld isn't large enough to accommodate both a floor jack and a jack stand at the same time. This was the issue I was alluding...

genesisowners.com

@viperboy2000 is correct. It's a clutch pack LSD with no electronics. Other than making sure I added a bit of friction modifier additive, per Kia's TSB, actual install was pretty straight forward, albeit a PITN. Getting the 1/2 shafts out of the wheel hubs was a real chore. I got it done just before the track day last Oct. Ran great. No problems since.

 

[Ohiocruiser]

I posted some notes here:

https://genesisowners.com/genesis-f...d Slip Differential).38084/page-2#post-513103

G70 - jack points?

But how do you swap out the floor jack with the jack stand? If one of the tools (either the jack or the stand) is using the pinch weld, then the other can't because the weld isn't large enough to accommodate both a floor jack and a jack stand at the same time. This was the issue I was alluding...

genesisowners.com

@viperboy2000 is correct. It's a clutch pack LSD (Limited Slip Differential) with no electronics. Other than making sure I added a bit of friction modifier additive, per Kia's TSB, actual install was pretty straight forward, albeit a PITN. Getting the 1/2 shafts out of the wheel hubs was a real chore. I got it done just before the track day last Oct. Ran great. No problems since.

I might have that put on my to do list in the future. Good to know it's a direct swap.

 

[Snowwhite]

LSD will not help the sliding to one side under heavy acceleration. If anything, it makes it worse. I have a RWD LSD and my car slides out to the right when I floor it. alignment is all within parameters and the car tracks beautifully as long as you're not flooring it. It's been doing it since new.

 

[mancinia]

then you definitely need to change your front tire size to bring it up to within 1% size difference.
View attachment 78924View attachment 78925

Great diagram and explanation!!! It helps clarify the misconception.

 

[Kodiack]

By square I mean the outside diameter of the tire..not width.hence my rotation comment...I count square as that and not the tires being the exact same size..
I use quickjacks for lifting my ride, seen in my profile pic. The 5000TL set lifts to around 38 inches but I had to make extensions for it because the Stinger has a really long distance between jack points. If anyone needs info or pics on what I did to make them let me know.