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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sun, Oct-08-2017, 06:43:29 AM   #1
WestRace
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Default Driving technique

So I used to have 19in. wheels stock with 5mm spacer on the rear and 10mm spacer on the front. My tire size is 245F/275R. The setup felt very natural and I always knew what the front and rear tires were doing. I did 100mph freeway interchange and always felt in control mainly I could feel what the rears were doing.
Now I change to new wheels 19in/8.5in/33mm offset/ 19in./10in./20mm offset. The offset is more aggressive especially the front. But I no longer feel comfortable with the balance. I no longer feel what the rear wheels are doing I guess because of the more aggressive front offset, it just dominates the handling. I don't know what happens when it let go. Before with my stock 19 in., I felt like I was in control, but now, I feel like when the rear breaks, I am not sure I can catch it.
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Old Sun, Oct-08-2017, 07:41:57 PM   #2
RedM3/4
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Default Re: Driving technique

The net is you went up 1/2 width front and back, and pushed the wheels out 14mm in front (ignoring 1/4 or 6mm wider inside and out from the 1/2 width), and 7mm in rear, so you net 7mm further out in front from stock.
In my experience this wouldn't be enough to dial out all the understeer the car has in it, but it would help a little.
But my gut says:
Maybe new tires could be a bit of a change in feel, but I expect the biggest deal is you added grip on 4 corners, therefore, whenever you put the car in under or oversteer it happens at a bit faster speed, and it's entirely possible the extra grip in rear (or front but your concern is rear) is just enough to change the suspension geometry when it comes loose. More body lean, for example. This could change how the car feels and 1. not change what you do to recover much, or 2. also change how you recover.

As another example, this is one of the biggest differences I felt between E36 and E46 M's. The E36 was lighter and had less rubber contact, and it was easy to get playful with it on the street and get the rear hung out a bit. The E46, with more weight and more rubber, I find few places I can be comfortable hanging the rear out on public roads, because 1. it happens at a higher speed, and 2 you're going to drift off-line more due to the extra mass.
So this may be kind of what you're feeling with your new, wider setup.

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Old Mon, Oct-09-2017, 02:37:08 AM   #3
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Default Re: Driving technique

also if your wheels are lighter, the car will feel more playful and abit more nervous if youre not used to it.

the offset change doesnt look serious..
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Old Mon, Oct-09-2017, 01:20:39 PM   #4
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Default Re: Driving technique

What tires were you using before vs now? How long did you give the tires to break in?
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Old Mon, Oct-09-2017, 02:00:33 PM   #5
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Default Re: Driving technique

..... what kind of tires are you on? You shouldn't notice any difference with those rim sizes.. but if you want from a set of Michelin PSS to a set of Fuzions, there might be the issue LOL

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Old Mon, Oct-09-2017, 02:10:06 PM   #6
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Default Re: Driving technique

Why would rear break loose during street driving?


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Old Mon, Oct-09-2017, 02:31:40 PM   #7
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Default Re: Driving technique

I wish I was as sensitive as some of you guys to notice all this in the street. I can go from 20's to 18's and it'll all feel the same to me after about 15min of driving.
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Old Wed, Oct-11-2017, 11:57:49 PM   #8
WestRace
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Default Re: Driving technique

Tires are Michelin Pilot Sport A/S so they are not bad. I don't see how changing tires will make any drastic differences.
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Old Thu, Oct-12-2017, 12:01:03 AM   #9
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Default Re: Driving technique

Get fixed-back seats. You'll feel EVERYTHING.
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Old Thu, Oct-12-2017, 01:02:37 AM   #10
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Default Re: Driving technique

Quote:
Originally Posted by ThunderMoose View Post
Why would rear break loose during street driving?


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Discussing Driving technique in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)