04-10-2021, 07:26 AM | #23 |
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If you look at the comparison bar, you can see that the F8X was also faster than the E92 GTS and using street tires to boot . It’s normal progression.
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04-10-2021, 07:28 AM | #24 |
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Yes, if you do the math based on the weight that they show, it comes up to 53-47, more in line with what is expected. Typo on their part... but they got it right in the tech sheet.
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04-10-2021, 09:24 AM | #26 | ||
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The sector analysis was also interesting to read. The G8x was one second quicker in the fast sector vs the GTS... Would have preferred no weight gain of course, but it seem BMW M have delivered a quite well developed and capable car once again. |
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04-10-2021, 09:47 AM | #27 | |||
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And if we compare the F82 Competition time with the Porsche 911 Carrera S (991 facelift), the difference is much bigger, 2,6 sec. compared to 1,6 in the case of G82 and Porsche 911 Carrera S (992). The M3/4 was never this close to Carrera S! Quote:
It was "marginally" faster than the base car on the Nürburgring, and was nowhere near the F82 GTS, or E46 CSL in that regard (CSL was only one second slower on the ring than the E92 GTS!). In my opinion the G8X had much, much harder task to catch up with the F82 GTS, because the F82 GTS has set the bar much higher compared to E92 GTS! Quote:
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04-10-2021, 10:11 AM | #29 | ||
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Looking at the versions on street tires: E90C 1:41 --> 5 sec F82C: 1:36 --> 2 sec G82C: 1:34 We're comparing only one data point here, so it means what is means, but I see this just as a normal generational leap. Nothing extra-ordinary. A big portion of the leap from one generation to the next is attributable to tire tech. We can't even directly compare the F8X and G8X with PSC2 as Michelin have made significant improvements with the latest gen PSC2. According to BMW, the base G2X chassis is 25% stiffer than the base F3X chassis while the G8X is 15% stiffer than the F8X. Do the math...
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04-10-2021, 10:51 AM | #30 | |||
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As mentioned in my previous post, the underbody bracing on the G8x is larger and has more solid anchorage to the chassis. This helps control especially the front crossmember. Meaning less movement in front suspension anchorage points. This is also a point made by BMW. |
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04-10-2021, 10:58 AM | #31 | ||
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04-10-2021, 11:02 AM | #32 |
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04-10-2021, 11:58 AM | #34 |
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04-10-2021, 12:44 PM | #35 |
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Eagerly waiting for the AWD numbers now and expecting it to be a perfectly executed double double tap on the usual competition and a shot fired at a range of cars formerly out of reach.
It’s obvious now that the RWD G8X live up to and exceed track speed expectations and historic performance. The AWD will likely put it at a new level never seen before in the M3 base car history. Then the CSL will do the same for special models. If M live on borrowed time, they’re going out with a bang. |
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04-10-2021, 02:14 PM | #36 | |||
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In its time, CSL was even faster than Porsche GT3 on some tracks, and M4 GTS was very close to GT3. Despite the fact that all versions of the BMW had the semi slicks, the E92 GTS in its time was nowhere near the GT3 if I remeber corectly? Now we have the G82 that is faster than the F82 GTS and even just in Competition form (no AWD, no CS/CSL) very competitive to P cars such as Carrera S. Latest M4CS was slower than Carrera S on this track, and the new CS will most porobably be faster. I would call that a very good progress! Quote:
Because that is the point I was making. Last edited by PeregrineFalcon; 04-10-2021 at 02:20 PM.. |
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04-10-2021, 03:44 PM | #37 | ||||
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BMW also points to having extra focus on stiffening the suspension pick up points on the G8x. Just a visual comparison of the front underbody bracing between the F8x and G8x shows that the G8x has larger triangulated brace elements. It's also anchored to the chassis on what BMW explains is a stiffer part of the unibody. |
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04-10-2021, 07:43 PM | #38 | |
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04-10-2021, 07:55 PM | #39 |
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It's good that they staggered the AWD release as releasing both at the same time the AWD version may have overshadowed the improvements of the RWD G8x. If you are lucky enough to live in a part of the world where you don't need AWD, the RWD version is proving to be quite capable in its own right.
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04-10-2021, 10:48 PM | #40 | ||||
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Base vs GTS:
Again, get your facts straight. The M4GTS is not the superstar you make it to be. Quote:
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04-10-2021, 11:15 PM | #41 | ||
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Please explain to me how the underbody shear plates on the G8x, both front and rear, are not an improvement over the F8x chassis bracing? The F8x front bracing does not have these shear plates and does not anchor the front subframe to the chassis in this way. The F8x rear bracing has a much less rigid design for the bracing and also does not connect the bracing across the width of the car. The G8x also connects the front and rear bracing via the sill area of the chassis. On the F8x the front bracing is not connected to the sill or even triangulated back to the sill. I don't understand how you can claim that the F8x bracing is just as good (or even better as you have implied previously). Clearly both front and rear bracing on the G8x is more complex and ties the front and rear subframe more solidly together as well as allows for less movement of these two critical components with regards to stability of suspension pick up points. It also has a dome-dome strut unlike the F8x. As an engineer, please explain to me why the bracing of the G8x is not better than the F8x when it comes to their role in anchoring the front and rear subframe to the chassis (and together) in order to decrease movement of these parts and provide for direct transfer of forces between them? Why is it just as good not to have the front triangulated shear plate? Why is it just as good to have the individual struts on the rear instead of the shear plates on the G8x? Why is it just as good to just have a brace under the rear of the transmission tunnel on the F8x as the full body width brace combination of shear plate on both sides and a shear plate that connects the two on the G8x? Claiming that, especially the underbody bracing, of the F8x is just as good as on the G8x is something I as an engineer simply don't get... Are you saying triangulation is a bad thing and that it's better with the individual struts on the rear than the shear plates on the G8x? And that it's just as good to to even connect these individual struts and not have a full body width rear brace connecting the two shear plates as on the G8x? Have you even bothered to look at this video of the G8x...? : 😉 |
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04-10-2021, 11:19 PM | #42 | |
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04-10-2021, 11:27 PM | #43 | ||
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I have attached photos to my previous post so you can compare. Second of all, instead of being smart. Explain what you mean is the difference in the subframes? You have made several posts about the chassis bracing, pointing out that you see no improvement at all in the chassis bracing. Please answer why that is your understanding. If you want to discuss subframes that is a different topic! |
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04-10-2021, 11:31 PM | #44 | |
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Again, I am not saying they did a bad job on the G8X chassis rigidity, far from it, but there's nothing that has me go "wow, this is a game changer".
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