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After market, body roll improvement for RX350?

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Old 07-18-14, 12:14 PM   #76
RXinNJ
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Originally Posted by SexyLexiRx View Post
FWD Rx 350 2013 with Sport Appearance package, that means 19" Fsport wheels, idk what tires. With tow package, which would add slightly more weight to the front end.

I just got this vehicle last month. It's great on my potholed roads that surround my house like a mine field, arg! I have to have a flexible suspension to deal with these roads, downtown Dallas, TX. So bigger rims is not really an option.

It was going great until my first roadtrip this week. I was fully loaded, 2 people, full boot with no extra space, it barely fit, hanging clothes all the way across the backseat. Going 80mph in a straight line on the highway is not a problem, but some of the more aggressive highway curves made me uncomfortable going even 75mph, which is the speed limit minimum,

I like a little give in the suspension but I think the extra weight made my vehicle sway more than usual on highway dips. So, I want to minimize the excessive body roll, and sway, and/or bouncy boat feel, without losing the pothole road armor, that keeps me comfortable around my neighborhood.

Should I replace the rear shocks with KYB "OEM" style? Would this give me a slightly stiffer rear end? No one has mentioned this idea yet. (Originally I looked for Bilstein but they don't make shocks for this vehicle.) This is my preference to start. I will say that I test drove an F Sport Rx350, and did not like the suspension for my neighborhood, it jarred me too much, so I need something in between.

I like the idea of wheel spacers to give me a wider stance. Or I could drop the vehicle with Zoom Bane springs, maybe 1" or 2". I probably don't want to do larger sway bars, in fact I would remove them completely like a jeep crawler, but I might completely fly off the highway at 80mph. I will also consider the "body damper" that Dolphin installed, it sounded like Dolphin really liked that upgrade. My old 1998 Chevy C1500 truck benefited a lot from being lowered, but it was hell around the neighborhood, before and after the lowering.
I couldn't help but notice, and I don't mean this to sound rude, but you're talking about all of these suspension mods and you haven't even determined what tires you have. Personally I would start there, and I say this as someone who had had (3) different sets of tires on my RX (18's). I noticed quite a difference in handling between them, and it wasn't wear-related because I swapped out one set after only a month. You shouldn't be uncomfortable on a highway curve at 75 mph, especially with 19's.
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Old 03-22-15, 03:47 PM   #77
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Hi,

I'm a 2010 RX350 owner and I also notice the side to side rocking at low speed turn, especially at the rear suspension. I'm just wondering if changing sway bar can reduce the rocking. I just found this MEVOTECH Part # MS86876 in Rockauto. It looks stiffer than the stock one. Your comment will be much appreciated.

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Old 03-22-15, 05:20 PM   #78
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That's an end-link. It's a transition piece at either end of the swaybar.
Here's a pic for a Lexus sedan.
Not even sure a heavier bar was available for the RX, possibly the F-Sport.




A soft rear bar will present itself as excessive body roll while cornering. The torque in the steel bar is overcome by the mass of the car wanting to go straight. Each control arm will react differently as the weight of the car shifts in a turn. Inside will open up (allowing that side of the car to raise up). Outside will compress( allowing that side of the car to drop down). The sway bar is a torsion bar designed to minimize the difference between the sides & "try" to keep the car on the flat & level.
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Old 03-23-15, 08:12 AM   #79
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I recall we discussed this at the start of this thread. I and others have searched. There are no aftermarket sway bars for the RX350. I would get them if available. The F-Sport has the same anti-sway bars. No other Toyota/Lexus model has bars that will fit. The difference in the F-Sport is stiffer shocks (rear), struts (front) and I think stiffer springs, plus the lateral dampers (like strut tower bars) front and rear. Some folks installed the lateral dampers and claimed a big improvement in handling, again, covered earlier in this thread.

I installed H&R 20mm wheel spacers, which by increasing the track, reduced body roll by lowering the center of gravity a bit and I thought were well worth the couple hundred dollars. This was covered in another thread.
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Old 03-23-15, 04:39 PM   #80
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I would go aftermarket wheels that are wider.....like 19x8.5s with the same offset or slightly lower offset (I have seen some nice wheels with an offset between 30-35.... OEM offset is 35). That would push the wheels out a little. Then I would put 255/50r19 tires, which would give you a 20 mm increase in width while maintaining almost the same side wall height. Like others have said, check your tires. The michelin latitude tour hps that were on my car were way too rough a ride, but that was on my f sport. On your car with the softer suspension that wider wheels and tire setup combined with the stiffer michelins would likely I do the trick. I went the opposite way....I got new wheels and tires but went with a softer riding h rated tire (Pirelli scorpion verde) in a 245/55r19 to give more cushion, as I thought the f sport ride was too firm. My new package did the trick...my car rides great now without sacrificing the cornering and handling characteristics of the f sport package.

I would stay away from spacers....I have heard horror stories about broken lugs and voided suspension warranties. Plus, if you went with a 255/50r19 tire, you could keep the OEM offset while pushing the tires out by 10mm on each side...the equivalent of using 10mm spacers without the safety risk
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Old 03-23-15, 04:39 PM
 
 
 
 
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