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  #21  
Old 09-06-2019, 11:56 AM
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Quote:
Originally Posted by bcredliner View Post
I don't know what inconsequential is to you. To me anything that reduces 0-60 time, negatively impacts handling and ride is not inconsequential.

As long as the total height of the rim and tire is greater, low ratio gears or otherwise, acceleration time from 0-60 is always reduced. An exception could be if there was one less shift before 60. Of course, the degree of impact depends on how much greater total height is increased.

You are correct that weight of rims is a factor. There might be taller rims/tires that are lighter weight and don't increase total height than what OP has, but, in comparison to other methods of filling the wheel wells it would be an expensive route to go.
Couple things... You mention the ride quality should be the same with if the spring rates are the same, that is not the case unfortunately since the springs and struts have to operate in harmony. Lowering springs with OEM rates are going to be paired with struts which operating at a lower ride height which it wasn't intended for.

I agree with you on increasing performance when possible, the first mod I did the day I brought home my X5D was replace the heavy OEM 19" wheels on RFTs to 21" Style 612M on Michelin PSS and saved about 12lbs a corner. However the short gearing and thin 325/30 rear tire leave something to be desired so once these PSSs are toast I will run some Continental 5Ps with higher aspect ratios, front will go up some size from 35 to 40 and the rears will jump up 2 sizes from 30 to 325/40. Heavier tire, slower acceleration? Yup. Is the lower rpm at highway speeds and added comfort from the taller tires worth it? Absolutely. If 0-60 times were so important that all mods tailored to acceleration then I would simply not buy a 5,000lb SAV lol. Thankfully I have a 550whp E61 which does a nice job satiating that craving.

The added bonus of the taller tires is less fender gap. We will see once I install the new tires but I might be able to get away with only installing Eibachs springs up front and coding the rear air down just a hair to match. Ideally offering an OEM like ride with minimal fender gap and added comfort from taller tires. If it doesn't pan out this way then ponying up for KW coilovers is next. Pricey but worth it IMO. I have ran them on all 3 of my vehicles.

I test fit a 285/45/21 up front and unfortunately it didn't clear the upper spindle joint (and it probably would have rubbed on the liner at lock) but it gets me fired up for the meatier tires. IMO a little 1-1.2" drop would be all it needs to look proper.

More pics in my build thread:
https://xoutpost.com/bmw-sav-forums/...og-m57-x5.html
As for sway bars there are only 2 companies I know of that make a rear sway bar (no fronts). I run the Ultra Racing rear sway. I minor improvement over stock, the E70s could use much more robust sways.

Evan


Last edited by ucsbwsr; 09-06-2019 at 12:02 PM.
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  #22  
Old 09-06-2019, 05:59 PM
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The H&R drop is less than two inches. There is no noticeable change in ride though there is improved steering wheel feedback.

Increasing both unsprung weight and increasing distance from the bottom to the top of the tire negatively impacts both acceleration and handling. I don't know if OP cares but I thought it worthwhile to mention. Some low profile tires like Continental Extreme Contacts have soft enough sidewalls that the ride feels much the same. Unless one is tracking, coilovers don't pass my value equation of amount of improvement for total dollars spent. You can spend far less and have much better handling than can ever be safely used on the street. I have always questioned having suspension that had very many adjustments. The tendency was to spend too much time messing with adjustments when more track time would have been far more beneficial.

It all depends on what is important to the owner. Personally, I didn't want to compromise much comfort but was willing to for significant improvement in handling and performance. It took some trial and error and some risk but all were achievable.
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  #23  
Old 09-12-2019, 01:41 PM
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I did KWV3’s to lower mine and 50k miles later lover them still.

Over sized tires....I may be in the market for 4 new shoes. How big can you go without running into rubbing issues? Right now I am 275/40/20
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  #24  
Old 09-12-2019, 03:25 PM
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I did KWV3’s to lower mine and 50k miles later lover them still.

Over sized tires....I may be in the market for 4 new shoes. How big can you go without running into rubbing issues? Right now I am 275/40/20

Wouldn't that depend on YOUR suspension and how much YOU lowered it?!?!?
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  #25  
Old 09-12-2019, 04:30 PM
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For the front we’re limited by the upper control arm as it’s only a couple inches away with stock 275/40/20
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Last edited by SF2000x5; 09-13-2019 at 01:28 AM.
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  #26  
Old 09-12-2019, 08:12 PM
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If he is on stock rims..if running a different offset from stick, all bets off




HOWEVER, if all you want to do is change rubber size... LOOK at your current fitment. Look at clearance from diameter and section width. Going from 275 to 285 is 5mm 'fatter' on each side. about 1/4 inch.... just a bunch of math and measuring.
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  #27  
Old 09-13-2019, 12:54 PM
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Quote:
Originally Posted by Duc Hunter View Post
I did KWV3’s to lower mine and 50k miles later lover them still.

Over sized tires....I may be in the market for 4 new shoes. How big can you go without running into rubbing issues? Right now I am 275/40/20
In general, wider tires should be put on wider rims. Best way to know how low you can go is lower it and then use the adjustment capability to see how far you can go based on existing tires and wheels. From there you can determine if wider or taller tires will hit or fit. Be sure to consider suspension travel necessary for bumpy roads and around curves. I would add spacers before wider tires and wheels as that will help fill the wheel wells and improve handling, and, cost much less.
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  #28  
Old 09-20-2019, 11:42 AM
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Good advice from most.

ARD, are your eh same ARD on the Porsche boards? Just curious, its an unusual name.

I dont want to go wider, I am wide enough. My aftermarket wheels give me some clearance to the control arms. I don't remember their measurements right now. I just want to go taller on the tires to Gainesville some sidewall. I know some have gone taller sidewalls on stock suspension and lifted. By my eyeballs the tallest part of the tire front to back never gets below the fender liners, meaning we would all be limited in front relatively similarly, lowered or not. It woudl be in front, wheels turned and they rub the fenders if the tire is too tall.

I was hoping someone here had gone taller on stock or lowered suspension and had some experience to post their results. As for how low, I am on KWV3’s and as low as they can go in back, and then the car is set to a level ride heigh from there. It’s not really that low.
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  #29  
Old 09-20-2019, 11:54 AM
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Quote:
Originally Posted by Duc Hunter View Post
Good advice from most.

ARD, are your eh same ARD on the Porsche boards? Just curious, its an unusual name.

I dont want to go wider, I am wide enough. My aftermarket wheels give me some clearance to the control arms. I don't remember their measurements right now. I just want to go taller on the tires to Gainesville some sidewall. I know some have gone taller sidewalls on stock suspension and lifted. By my eyeballs the tallest part of the tire front to back never gets below the fender liners, meaning we would all be limited in front relatively similarly, lowered or not. It woudl be in front, wheels turned and they rub the fenders if the tire is too tall.

I was hoping someone here had gone taller on stock or lowered suspension and had some experience to post their results. As for how low, I am on KWV3’s and as low as they can go in back, and then the car is set to a level ride heigh from there. It’s not really that low.
Can you post some pics of your X5? I run KW on all my other BMWs and am considering them for my X5D, curious to see how low "lowest" is and also, how is the ride quality at your ride height?

Regarding tire size, as you can see in my post above a 45/21 won't clear the upper control arm, a 40/21 will. You can look up the rolling diameter of those Continental tires and plug it into a fitment calculator such as www.willtheyfit.com to get an idea how other brand/size/aspect ratio tires will fit. Now if it will rub since you are lowered that is a different question and something you are going to have to figure out on your own, the easy solution is to raise your X5 if it rubs.

Once my Michelin PSSs die I plan to run a 325/45/21 and 285/40/21 tire. I think it should work no problem with my stock non-sport suspension but I plan to lower a tad with Eibach springs up front and coding the rear to remove any excessive gap. KWs are the backup if the ride quality isn't up to par.

I will be a helpful reference for you once this is executed but in the meantime you can use the info from my research thus far on what will fit and translate that to your situation with KWs and aftermarket wheels.

Evan
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  #30  
Old 09-20-2019, 04:50 PM
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Don't lose track that clearance can vary by model and or wheel offset and width as well as size tires. Be sure you are comparing apples to apples.
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