05-26-2021, 06:20 PM | #23 |
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Not sure why coil overs won't help him. As soon as you lay down the power, the car will tend to twist with the right wheel squatting which reduces grip on the left wheel causing it to spin. Not saying this is the end all - be all solution, but there is still huge benefit with coil overs.
Just doing the Dinan shockware upgrade on my xdrive made a difference on grip. Not LSD awesome, but in many cases where I had wheel slip from chassis rotation were now gone. |
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05-27-2021, 02:07 AM | #24 | |
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The twisting is so negligible that it makes 0 difference. Stock suspension of a nearly 2 ton vehicle is not made of cheese either. If your theory was right, the comfort-focused SUVs would have the most terrible traction ever.... and we all know that is not the case. Traction does NOT depend on suspension. Only handling and aerodynamics and of course comfort.
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05-27-2021, 02:17 AM | #26 | |
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I have no grip problems at all. My setup is completely stock on 18" all weather high performance tires (square setup) and DHP with adaptive suspension. Oh, that's right. I forgot to mention I have the lowly 328 with a 4-banger N20 engine. No grip trickery required! Seriously, good luck finding the right balance to get the grip you need. I'm properly jealous of all your torque and horsepower. |
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05-27-2021, 08:10 AM | #27 | |
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Not sure if I'd compare a 5 ton / 200HP SUV to a much lighter 450HP car with this comparison, since there is a ton of other physics elements at bay. |
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05-27-2021, 08:29 AM | #28 | |
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Comparing different types of suspension, as in your example, to simply a change in height of the same suspension is BS to start with. But hey, if placebo made you think your traction was improved by lowering the car - it still counts as a success! So don't regret it.
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05-27-2021, 09:08 AM | #29 | ||
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Coilover kits almost always increase spring rates, which have a very large impact on traction, as does the ability to corner balance.
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05-27-2021, 03:10 PM | #30 | |
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That being said, stiffer rear sway bars will also help by keeping both wheels planted. |
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05-27-2021, 05:25 PM | #31 | |
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Here's an interesting read. https://www.roadandtrack.com/car-cul...ave-less-grip/ |
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05-27-2021, 05:41 PM | #32 | ||
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If there is one BMW that is far from stiff it's the F2/3X xDrive. At the same time I absolutely agree with your opinion that some BMWs are unreasonably stiff, the Competition models being the worst offenders.
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05-27-2021, 05:48 PM | #33 | |
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Yeh, I need springs, just don't want to commit to them. My 340 is FAR from tight in the suspension area. Body rolls, it floats, far from "the ultimate driving machine". Dinan Shockware helped a lot, but that's a bandaid for sloppy springs. |
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05-27-2021, 06:13 PM | #34 | |
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To circle back to OP's original question for his RWD car, a diff is going to "rank first" considering you already have great street tires. It's also going to be the most expensive, but this game has always been pay to play, especially as you start down the path building a beast motor. Enjoy.
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05-27-2021, 07:10 PM | #35 |
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The MPS4S has excellent grip to wear characteristics, but if you are going big turbo then I would start with stickier tires. Sorry, wear is a trade off, you can't avoid it.
Another question is what you want to accomplish with these mods. Drag? Track? Or just highway pulls. Do you just want to be fast or do you want a balanced well handling car? If you just want to be fast on the street and on the highway then RE71R, Goodyear Supercar 3 or MPS4S in order of grip from greatest to least. You also might look into Falken RT660, Hankook RS4's, or Yoko AO52. Personally I love the RE71R's for track and street use. They are expensive and hard to find now however. Yes, I would get tires before anything else if you are really about true performance.
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05-28-2021, 05:41 AM | #36 |
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The MP LSD on my RWD 340i has made for dramatic improvement in handling and traction. The easiest way to describe is it has changed the car from a one wheel drive to two.
In my humble opinion any increase in power is almost pointless until you install a LSD. You will not regret. |
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05-28-2021, 06:00 AM | #37 |
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Raise the boost reduction in 1st gear to 20%, and 10% in 2nd. If that doesn't work, reduce it a little more.
Enjoy being faster.
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05-28-2021, 09:53 AM | #38 |
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Everyone is arguing about grip, but not specifying that dependent on the situation grip is solved differently. OP is not tracking so he is looking for straight line and from-a-dig grip. That is why suspension will not solve anything for him.
Once you move away from straight lines and want to improve grip on turns and such you need to focus on keeping the tires on the ground. That's when suspension comes in; coilovers, sway bars and the like. An LSD also helps here. For straight line grip you need to focus on wheel spin and that is dictated by the tire compound, contact patch size, and slip differential between the powered wheels. If this was a racing domain than you would also add downforce here . Focus people.
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05-28-2021, 10:25 AM | #39 | |
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OP if you're going to make the step to 200TW this year put in your order soon. A lot of the manufacturers do not produce them year-round so just keep that in mind.
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05-28-2021, 11:34 AM | #40 | |
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So… tires first.
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05-28-2021, 11:40 AM | #41 | |||
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05-28-2021, 11:53 AM | #42 |
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definitely LSD for drag as well as turns
get a 2nd pair of OEM rear wheels with yokohama advan A052 255/35/19. swap when necessary, for (drag)racing. |
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05-28-2021, 01:02 PM | #43 | ||||
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05-28-2021, 01:13 PM | #44 |
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I meant no sarcasm in either sentence. 🤷🏻*♂️
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