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Thicker front sway bar suggestion.

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Old 12-06-17, 01:50 PM
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Zerodrag
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If you are in SoCAL (near Long Beach), there is someone selling OEM struts with Eibach springs for a good deal in the SC300/400 forums...

https://www.clublexus.com/forums/sc4...oem-sways.html
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Old 12-06-17, 02:17 PM
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Can't say what I would do, but:
1. Fix whatever it wrong with your spring height. If that's a high-mileage (sagging) spring replace both springs.
2. Increasing the thickness of a sway bar drastically increases its roll resistance, far beyond a simple comparo of new diameter vs. old diameter.
3. Changing only one bar un-balances the roll stiffness proportion of front vs rear. A stiffer rear bar increases oversteer, which generally helps since these (and most) cars tend to be designed with mild understeer for safety. Humor: oversteer is where the passenger is scared, understeer is where the driver is scared.
4. If you change both bars (and assuming the lever ends, bushings, etc. remain constant), the usual choice is to add the same thickness to both (like 2mm) rather than do a calculation.
5. Heavier bar(s) will reduce ride quality on a bumpy road, but not a flat road with hills - one-wheel bumps will be rougher.
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Old 12-06-17, 02:50 PM
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Originally Posted by Zerodrag View Post
If you are in SoCAL (near Long Beach), there is someone selling OEM struts with Eibach springs for a good deal in the SC300/400 forums...

https://www.clublexus.com/forums/sc4...oem-sways.html
Im in NorCal and the seller mentioned local pick up only so there goes that. Bummer.. Thank you for sharing that though !
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Old 12-06-17, 02:54 PM
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Originally Posted by kitabel View Post
Can't say what I would do, but:
1. Fix whatever it wrong with your spring height. If that's a high-mileage (sagging) spring replace both springs.
2. Increasing the thickness of a sway bar drastically increases its roll resistance, far beyond a simple comparo of new diameter vs. old diameter.
3. Changing only one bar un-balances the roll stiffness proportion of front vs rear. A stiffer rear bar increases oversteer, which generally helps since these (and most) cars tend to be designed with mild understeer for safety. Humor: oversteer is where the passenger is scared, understeer is where the driver is scared.
4. If you change both bars (and assuming the lever ends, bushings, etc. remain constant), the usual choice is to add the same thickness to both (like 2mm) rather than do a calculation.
5. Heavier bar(s) will reduce ride quality on a bumpy road, but not a flat road with hills - one-wheel bumps will be rougher.
Very helpful, thank you ! I'll definitely need to address the uneven ride height issue lest after putting on lowering springs, it sags even more on one side and cause possible rubbing issues. And yes, the thicker bars on both front and rear make sense so if I go on that route down the road, I'll need to get a full set.

Last edited by Celtica; 12-07-17 at 08:02 PM.
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