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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 11-16-2013, 02:25 PM
iffy iffy is offline
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e46 325i 2001 - wheel discussion (not the usual)

Ok, I have just bought a set of 17inch Ac Schnitzer alloys so that I could compare against a set of replicas I have. My purpose for changing over is because I wanted a better ride and better economy. Now I have made a comparison and have noticed the following:
  1. The 17's are definately better at handling bigger bumps
  2. the 18's are much better at handling smaller imperfections in the road as I find that the 17's 'bounce' alot (why is this?)
  3. the 17's are WAY more economical on the motorway
  4. the 17's are easier on definately easier on the suspension
  5. 17 inch wheels look better on the front axle

First and foremost, are people on the forum in agreement with my findings?

Next up, why do I use more fuel on the motorway? Is it because of wheel size? The two set-ups I have are 1) 225/45/17 and 245/40/17, 2) 225/40/18 and 255/35/18. FYI, both alloy wheels weigh the same.

Now this question is one that may raise eyebrows. The 17's I have don't look good on the back, because of the 43 offset. I phoned ac schnitzer in UK to enquire about spacers, the rep told me stick on 7mm spacers to bring the offset down to 36. If I was to do this, the arches would be filled nicely, but this would be right outside BMW's offset recommendation which is between 40 and 50 offset. Surely this would cause major problems with the suspension? However the rep swears it won't!

Another interesting fact I came across is that if you where to purchase a new vehicle from BMW with AC Schnitzer parts on it, and lets say the spring on the car broke within the warranty period, your warranty would be with AC Schnitzr not BMW. So you would need to wait for authorisation from AC Schnitzer before BMW would touch the vehicle. Why is that? BMW don't have a problem supplying a BRAND new AC schnitzer vehicle from there dealership.
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  #2  
Old 11-16-2013, 03:52 PM
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Quote:
Originally Posted by iffy View Post
Ok, I have just bought a set of 17inch Ac Schnitzer alloys so that I could compare against a set of replicas I have. My purpose for changing over is because I wanted a better ride and better economy. Now I have made a comparison and have noticed the following:
  1. The 17's are definately better at handling bigger bumps
  2. the 18's are much better at handling smaller imperfections in the road as I find that the 17's 'bounce' alot (why is this?)
  3. the 17's are WAY more economical on the motorway
  4. the 17's are easier on definately easier on the suspension
  5. 17 inch wheels look better on the front axle

First and foremost, are people on the forum in agreement with my findings?

Next up, why do I use more fuel on the motorway? Is it because of wheel size? The two set-ups I have are 1) 225/45/17 and 245/40/17, 2) 225/40/18 and 255/35/18. FYI, both alloy wheels weigh the same.

Now this question is one that may raise eyebrows. The 17's I have don't look good on the back, because of the 43 offset. I phoned ac schnitzer in UK to enquire about spacers, the rep told me stick on 7mm spacers to bring the offset down to 36. If I was to do this, the arches would be filled nicely, but this would be right outside BMW's offset recommendation which is between 40 and 50 offset. Surely this would cause major problems with the suspension? However the rep swears it won't!

.
The 17-inch setup has taller sidewalls, which will give a more cushy ride, albeit with a little more "bounce effect", as you`ve noted (try playing with tire pressures to minimize this).

I dislike spacers, they can do bad things to your car. Learn to live with that 43 offset, it`s ideal for your application. Next time you need tires for those 17s, try some Dunlop Dirrezza Star Specs, they are bigger in profile than most others of that designated size.
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  #3  
Old 11-16-2013, 06:11 PM
Fishful Thinking Fishful Thinking is offline
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Originally Posted by Fast Bob View Post
Next time you need tires for those 17s, try some Dunlop Dirrezza Star Specs, they are bigger in profile than most others of that designated size.
Bob, I just wore through my Star Specs and now have Michelin Super Sports. Although I liked the grip of the Dunlops, I hated how much they tram-lined. The SS's barely tram-line at all on the same roads that would have the Star Specs pulling the wheel like crazy and making the car jump half a lane. And with the $70 rebate plus Costco pricing, they weren't much more money. Just food for thought.
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  #4  
Old 11-17-2013, 01:19 PM
iffy iffy is offline
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Quote:
Originally Posted by Fast Bob View Post
The 17-inch setup has taller sidewalls, which will give a more cushy ride, albeit with a little more "bounce effect", as you`ve noted (try playing with tire pressures to minimize this).

I dislike spacers, they can do bad things to your car. Learn to live with that 43 offset, it`s ideal for your application. Next time you need tires for those 17s, try some Dunlop Dirrezza Star Specs, they are bigger in profile than most others of that designated size.
Should I run tyres at a higher or lower pressure than factory recommendations?
Why do you think the offset of AC's are ideal? My rear tyres sit so far in the wheel well that it's pretty horrible to look at. In fact, is there anything I can do to fill out the arches other than adding spacers?


On a separate note - michellin ps3 are supposed to be the best tyre for ac schnitzer wheels.
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  #5  
Old 11-17-2013, 01:52 PM
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Quote:
Originally Posted by iffy View Post
Should I run tyres at a higher or lower pressure than factory recommendations?
Why do you think the offset of AC's are ideal? My rear tyres sit so far in the wheel well that it's pretty horrible to look at. In fact, is there anything I can do to fill out the arches other than adding spacers?


On a separate note - michellin ps3 are supposed to be the best tyre for ac schnitzer wheels.
You`re missing The Big Picture....you`re only seeing your car at it`s static ride height (i.e., parked). These cars have independent rear suspension, which travels through a WIDE range of motion when driving in The Real World. When the engineers are designing a particular wheel for a particular car, they do so with this full range of (suspension)
motion in mind.

They choose an offset which pretty much keeps the rear wheel centered within the wheel well to give the most clearance possible, and to keep the tires flat against the pavement while under load for better control. They could care less whether it "looks cool" or not, they`re designing it for maximum performance, not to satisfy the desire of 16-year-old kids....

And, anyone who tells you they "have the best tire for AC Schnitzer wheels" is yanking your chain....
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  #6  
Old 11-17-2013, 03:18 PM
iffy iffy is offline
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that was ac schnitzer rep who told me that. he said it was a good fit due to j shape or something!
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