05-22-2024, 10:57 PM | #1 |
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How do we stop the wheel hop!?
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I have an LCI / N55 car, factory software, only mods are a charge pipe and bigger FMIC. Tire setup is slightly embiggened with 275/35 rears, running PS4S currently. Today it was wet & rainy (not a downpour, but definitely wet road), I pulled away from a stop gradually but then gave it a good bit of throttle. Slight wait while boost loaded and then suddenly tons of wheel hop. It seems like the moment the wheels try to break loose on this car, rather than simply spinning and/or making smoke, I get fairly violent wheel hop. I've tried to search but not getting a lot of hits for "wheel hop." Is there a solution to this? Will different suspension help? Some sort of rear subframe brace? It's really kind of ridiculous and also a bit embarrassing...
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05-22-2024, 11:14 PM | #2 |
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Are you sure it was wheel hop and not just DSC kicking in? Press and hold the DSC off button for 10 seconds to completely turn it off.
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05-22-2024, 11:18 PM | #3 |
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It's hop, it happens before the car has yawed at all so DSC wouldn't have any reason to kick in, and I'm not getting any flashing stability / traction indicator on the dash.
I know what DSC intervention feels like, as I regularly drive in snow. DSC braking is way less violent than the wheelhop I get when trying to accelerate hard on low traction.
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I'm an IT guy by trade and tech nerd by choice. I like HPDEs, parts of US Hwy 129, NC 28, and the Cherohala Skyway. I'm also a fan of aural pleasure. |
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05-23-2024, 04:20 AM | #4 |
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It's an an issue experienced by many F8X owners though gets more of a mention on the F80/82 forums and most I've read relate to DCT launching from standstill. Common theme is the cause is the diff rotating under load and the fix is installing the diff rear dual mount bracket/mounts. The subframe has provision for the dual mounts but BMW decided to fit just one, no doubt to save $.
I don't do 'launches' (have 6MT) but used to have the wheel hop (& accompanying terrible drivetrain backlash/noise) most notably on climbing tight corners where I'd be modulating throttle to max exit speed (& minimise wheel spin), as the inside wheel lifts and continually looses/regains traction the hop/backlash would happen forcing you to back off in sympathy! Then at 100K km I had a leaking diff pinion seal so had all three diff seals replaced (leaking driveshaft seals are another known issue) and while there had the shop install the dual mounts. Now in those tight climbing corners I don't get the hop/backlash, the transition between losing/gaining traction in the rear is way smoother and I would guess overall there is more traction. I went with the Powerflex purple poly bushings/mounts (4 front/dual rear) which did introduce diff whine when cruising 95-105kph. The noise free option is to just add a dual mount bracket & 2nd oem mount (making sure it's the 2018 updated solid rubber one & not earlier oil filled version). |
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05-23-2024, 06:35 AM | #5 |
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It's common, and will come and go depending on the temp, the tires, the tire wear, precip, etc.
Dual mount bracket for the rear with dual updated OEM black bushings is the most common fix, and introduces no additional NVH, the diff just works properly. |
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05-23-2024, 10:23 AM | #7 |
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Fan of the bracket here as well - but I prefer stiffer bushings so you can enjoy that faux straight cut gear whine
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05-23-2024, 10:49 AM | #9 |
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Indeed one must always keep their priorities in mind when making these kind of decisions - the sale of an F87 should never get in the way of a 458 purchase
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05-23-2024, 07:30 PM | #10 | ||||
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Quote:
Quote:
I notice the hop basically any time I floor it in 1st from lower speeds after doing a brief rollout from a stop. I suspect some of this is because the weight transfer needed to help keep the rear down isn't happening in a "non-launch" scenario. Quote:
Quote:
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2004 Matrix XRS 6MT => 2008 VW R32 DSG => 2012 Audi TTRS 6MT => 2018 BMW ///M2 6MT
I'm an IT guy by trade and tech nerd by choice. I like HPDEs, parts of US Hwy 129, NC 28, and the Cherohala Skyway. I'm also a fan of aural pleasure. Last edited by ZPrime; 05-23-2024 at 07:57 PM.. |
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05-23-2024, 08:33 PM | #11 | |
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The dual carrier with the OEM 2019+ black bushings is the way to go, zero additional NVH and vastly less wheel hop. However, understand that it's a tire grip/surface/temp thing, so there are still times when you can have a bit of hop with the dual-mount, but it'll be drastically reduced. |
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05-23-2024, 09:29 PM | #12 | ||
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Are the powerflex poly bushings really that bad? They have two sets, one of which they claim is "OE-like NVH"... And is it worth doing the diff front-mount bushings at the same time? (And if so, are the poly a bad idea there too?) Would my LCI car already have the non-oil/solid bushing in the factory location, or did that change not get introduced until the Comp? My car was actually built in summer 2017, delivered in October. For a sense of tolerance - I ran VF Engineering aluminum + poly engine & transmission mounts on a 2008 VW R32. Had no complaints about those, except the poly failed pretty quickly, and I didn't want to be constantly replacing engine mount bushings. So I switched to DLI Technik, which are 100% metal, with giant springs on them. High frequency noise did make it into the cabin occasionally (mostly, accessory pulley sounds that made you think of supercharger whine), but for the most part they were not bad at all. OTOH, I think I probably only have another 3-5 years left with this car (I'd like to get into a 911 eventually), so I don't want to go too far down the "uncomfortable/performance" slide.
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2004 Matrix XRS 6MT => 2008 VW R32 DSG => 2012 Audi TTRS 6MT => 2018 BMW ///M2 6MT
I'm an IT guy by trade and tech nerd by choice. I like HPDEs, parts of US Hwy 129, NC 28, and the Cherohala Skyway. I'm also a fan of aural pleasure. Last edited by ZPrime; 05-23-2024 at 09:39 PM.. |
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05-24-2024, 06:52 AM | #13 | ||
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Quote:
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It's my understanding that the updated bushings were introduced with the S55 cars. It's easy to tell which you have, just go look underneath. |
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