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View Poll Results: What is your single most wanted F8X technical data? | |||
Steering system HPS/EPS | 8 | 7.48% | |
Power | 13 | 12.15% | |
Weight | 27 | 25.23% | |
Power to weight | 33 | 30.84% | |
Engine type I6/V6 | 8 | 7.48% | |
Turbo system | 10 | 9.35% | |
Other | 8 | 7.48% | |
Voters: 107. You may not vote on this poll |
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09-05-2013, 02:23 PM | #45 |
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Porsche also say that the new GT3 has the same ZF Servoelectric HW as the non GT3 991s. SW tuning seems to be the key and likely very, very difficult taken the poor results from BMW. I've read that Porsche has rather successfully attempted to "emulate" the steering feel of the 997's HPS system in the 991 GT3.
So it sounds like it's artificially recreated HPS feel which can't be easy or cheap to achieve with such a different method of assist. I think we can be sure that taken the limited number of HW available the SW for these systems will be guarded as Fort Knox by the manufacturers that has it figured out. VW could potentially offer Porsche's know how to Audi though but since there seem to be minimal help going that way likely not. |
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09-05-2013, 03:47 PM | #46 | |
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Porsche were quite late to the assisted steering scene in the first place. A front light car meant they didn't require assistance like a 50:50 or worse car did to do the 'comfort cruising' thing. Times have changed with 911's being as front light as they were, but still have less weight up front and less need to assist the crap out of a steering system. |
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09-05-2013, 05:08 PM | #47 | ||
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Well regardless of front or rear engine steering feel can certainly be made to be excellent. It is again simply that ZF+ZF software+Porsche+perhaps Porsche software or software tuning has delivered arguably the best EPS available from the perspective of a sports car and HPS like steering feel.
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09-05-2013, 05:20 PM | #48 | |
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A description is offered of the Porsche/ZF (software) system that monitors steering angle, yaw rate and other information from CAN coming through the stability control sensors to vary the assistance and, therefore, the felt "weight" at the wheel. This is opposed to totally different designs which only monitor the torque at the steering wheel. Like just about everything else in the world today - more software, software more important.
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09-06-2013, 05:02 AM | #49 | |
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Joking aside, I disagree with software being the crucial factor, important to not screw it up, yes, but I'm sure ZF know what they are doing. Steering feedback has to be due to the front suspension geometry and design. Some designs are inherently stable, some designs have a strong centreing characteristic, etc. Some give really poor feedback even with no assisted system, so how would they be tuned to give feedback with assistance? Answer is they can't (unless you think piped engine sound and piped force feedback ala computer joysticks are 'real'). |
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09-06-2013, 01:41 PM | #50 | ||
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Again just like DCT the fact that it basically a MT inside, that it has two transmissions running in parallel and two clutches as well - all of these contribute essential feel to the DCT. However, the software has more flexibility and more control. One only has to experience Drivelogic mode D1 vs. S6 to realize this.
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09-06-2013, 02:15 PM | #51 |
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swamp, after having refreshed yourself with the EPS science are you feeling more,less or equally confident that steering will be great with EPS on the F8X? Maybe steering is not one of your priorities in a car so it's not a big deal if it's a bit numb and artificial?
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09-06-2013, 07:56 PM | #52 | |
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For me personally steering feel is indeed important as either a purchasing consideration or as a important criteria in judging a vehicles performance. I just don't want to know details about it nearly as much as power to weight.
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09-07-2013, 02:10 AM | #53 |
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09-07-2013, 10:30 PM | #55 |
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Swamp, I have a question (since I know you come from an engineering background). Are EPS systems (usually) programed to vary the boost so that it always requires X amount of torque to turn the steering wheel Y degrees?
If so, that would completely make sense as to why the GT3's steering is so much better than the standard 911's. I still don't get why the loss of road feedback has happened though. |
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09-08-2013, 01:02 AM | #56 | |
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The short answer to your question is covered in just a couple posts back and is a resounding no. EPS systems come in many different varieties and can use feedback from a small or large number of monitored vehicle parameters. Also a better way to think about steering in general is not the torque required to move the wheel a certain angle but to imagine a graph of torque vs. angle throughout the lock to lock angular range. This graph will generally depend significantly on speed but with modern EPS systems such as in the Porsche things like vehicle yaw rate (i.e. is the vehicle rotating in the same plane as the road, either as part of a turn or perhaps part of over or understeering), stability control parameters and others are used to determine felt resistance at the steering wheel. I would speculate that in comparing a base 911 to the GT3 back when both had HPS the steering feel differences were due to both hardware differences and software differences. However, in the current EPS models I suspect all of the differences in feel are covered by software alone. Again emphasizing the importance of software in such systems.
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09-08-2013, 12:53 PM | #57 | |
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Anyway, thanks for answering that. It was just a thought I had. |
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09-08-2013, 10:04 PM | #58 |
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Weight or power:weight
Yes, low weight with the same hp as current would be fine with me (assuming more torque), because that aids handling. Keeping the existing weight and just adding hp is not the same, though the power:weight might be. Unfortunately, I don't think they will get much below 3,500 lbs given the starting point and price point.
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09-08-2013, 10:05 PM | #59 | |
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09-25-2013, 09:00 PM | #60 | |
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I look at it like this: compared to an e92 335i way more power way better handling way more technology similar weight |
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12-11-2013, 10:40 PM | #63 |
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Since we discussed it here quite a bit. The updates toady confirm that ZF were the chosen supplier for the M4s EPS system. No worries from me here at all.
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