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  1. S

    S3 how much power to rear wheels?

    The "claims" are facts that have been published by Audi AG or Haldex themselves. There is nothing in my posts that is not available from the source. The claim that the system "can send 100% of torque rearward without being in a 100% slip condition on the front axle" was never made. What I said...
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    S3 how much power to rear wheels?

    Good. Disprove what I have said if you have issue with it. Perhaps you'll make more sense than veeeight. 1. Haldex 4 and 5 are predictive and proactive 2. The systems are faster at directing torque than a purely mechanical system 3. Haldex is generally better on mixed surfaces. Several Sport...
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    Haldex Quattro system

    This is not really true anymore. Haldex Gen 4 (facelift S3 8P) and Gen 5 are proactive. The clutch pack is controlled by the ECU, and requires no driveline slip to lock up. On launch/acceleration, the cars are programmed to lock the clutch pack meaning you have 50/50 mechanical split. Also, when...
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    S3 how much power to rear wheels?

    Herlin clearly states a rough figure of 10%, depending on the manufacturer. And as mentioned to you, the figures for Audi used to be on the homepage under the lexicon. Here is an old German press release for the last TT coupé confirming that under normal circumstances 85% of the power is on the...
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    TTS purchase!!

    Yes and no. It has revised front roll center geometry, can run wider tires (255 section width), and has a lot more aluminum in the body shell. It's a bit less compromised than an S3, but obviously not as practical.
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    Feedback from those with S3s now

    Not at all. The key word was "theoretically." I was simply pointing out that there is nothing stopping engineers from creating a Haldex setup with a fixed rear-biased torque split. Configuring the existing open front diff to allow a fixed degree of slip would be one potential way to do so. XWD...
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    Feedback from those with S3s now

    I agree in part. As mentioned earlier, I have an S4 with sport diff. Compared to my old S3 8p, it is a tick better dynamically, but the sport diff seems to add more of a "rear steer" effect rather than any real tail-out action. I was curious if the new S3 and Golf R would be similar since they...
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    Feedback from those with S3s now

    It does. I think, as usual, the RWD 1er will offer a tick more involvement, but will suffer from traction issues and typically be slower on anything but a very tight circuit. With AWD, there isn't much you can do to increase involvement other than to bias the drive system heavily in favor of...
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    Feedback from those with S3s now

    I don't see it. Power oversteer is nearly impossible as Audi's AWD systems are set up to equalize axle speeds, avoid slip/traction loss, and provide optimal traction on mixed surfaces. The latest trickery like the sport diff on my S4 and the advanced XDS/EDS on the S3 allow torque vectoring to...
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    Feedback from those with S3s now

    This is just perpetuating myth. I have owned two Torsen/mech. Audis (including my current S4 with sport dif) and one S3 sportback (8P). The Haldex and Torsens are set up to function nearly the same on the road with both having slight advantages and disadvantages. The Haldex can and does...
  11. S

    S3 how much power to rear wheels?

    For Gen. II, the amount of rear wheel engagement varied by manufacturer and even among models in the range. Audi previously stated 15% on their old website under the lexicon. Other than that, you have a link already -- Herlin confirms between 10-15% for the Gen. II and points out that this...
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    S3 how much power to rear wheels?

    So it is either 15% or 15% that can tapers down to 10%. Even assuming you are right (which I know you are not, as the 15% figure has been published by Audi AG), I don't see the issue. As for the rest, you clearly don't even understand how your own MOT RR dynos work for brake testing. What...
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    S3 how much power to rear wheels?

    It is clutch pretensioning, and it means that 15% of the torque is on the rear wheels. The Haldex fully disengages on braking as it is electronically triggered to do so, and there is no reason for it to stay engaged. It does not disengage fully when cruising on a motorway. It is possible in...
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    S3 how much power to rear wheels?

    Regarding rear tire wear, the reason your rears wore faster than the front is that with Haldex 4, the rears get about 70% in acceleration scenarios. Also the clutch pack can lock up independent of slip, so rear wheel engagement is much higher than on previous versions. My old S3 8P Sportback...
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    S3 how much power to rear wheels?

    There is some misinformation here. First, there is always about 15-20% of torque at the rear wheels, it is never 0%, unless the rear is on glaze ice and the front has grip. This factoid used to be found on the Audi site too, under the lexicon section. Second, it is possible to apportion more...
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    Feedback from those with S3s now

    The "impact"? I am not entirely sure what you are asking, since the question is worded vaguely. But I'll attempt to answer anyways. The key advantage that the old mechanical Torsen 50/50 system had over Haldex 2, was that the system was biased for an even power split by default. This meant more...
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    Feedback from those with S3s now

    The RS cars also understeer at their tractive limits. There is no deception at work here. Both over and understeer at the tractive limits are a car's way of telling you that you have exceeded the limits. And you lose time with both. The goal as a driver (when not just out to have fun) should be...
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    Feedback from those with S3s now

    Again, I don't understand how "heavy" front bias applies to Haldex 4 and 5. You could make more of a case for Haldex 2, as that system relied largely on axle slip (some built into the driveline) that was either driver and/or environmentally induced to shunt more power to the rear. The newer...
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    Feedback from those with S3s now

    I don't think a revised differential is needed. What is the ultimate goal? Few people seem to understand how the newer Konzern Haldex systems work, and I would not say they are "heavily" front biased. In fact they approach RWD chassis in terms of feel in certain scenarios. With Haldex 4...
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    Feedback from those with S3s now

    Thank you for the kind words. Advice for driving AWD vehicles? Slow-in, fast out, with the caveat that one needs to watch out on corner exit and not get too impatient with the throttle. AWD vehicles will understeer on corner exit with impatient or inexperienced drivers. Drive clean lines, take...
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