If I would be sure the noise would be reduced. I'd do this for sure. But if it doesn't help much it's a real bugger. After all it ivolves some money and a lot of work. I don't really care about comfort (vibrations) as the car is already extremely comfortable. Due to the low center of gravity the e-Golf has really soft springs. I also run tires with high sidewalls (225/55R17).
It's definitely not by accident. And the speedo is now more accurate than stock. Most VW's are ~6% off.
Bigger tires (diameter - not width), mean more comfort and better rolling resistance. For the previous cars longer gear ratios also improving fuel consumption. Electric doesn't make a difference.
I actually passed these over from My Alhambra to Touran and now Golf. Even winter tires are 215/55R17
Only case I'd put stock diameter tires is if I sell the car
I see you have the same hum at 210hz or thereabouts that I have. Part of the rear subframe resonates like crazy under certain conditions. Unfortunately unaffected by this particular mod.I just mounted the damper today. Took 3 minutes including some photos.
Next I went to my std measuring straight. Pretty smooth asphalt and cc at 82 km/h.
View attachment 283292
Clear difference in the resonance at 120 Hz.
Then I selected a rough road as well. Also asphalt but quite rough. 41 km/h
View attachment 283293Again a reduction in the resonance. A bit lower frequency as speed was lower too.
I must admit I was surprised as the effect was bigger than expected. Made the investment totally acceptable. This was on a 2020 e-Golf with additional sound deadening added.
Dave. The GPS are actually quite good. At least what we have here. If yours is "out" it might be time to update. Momentarily they can be off but average over a reasonable time is good. I also use professional measurement equipment (VBOX) for work and they confirm even iPhone GPS is okay for speed. Speaking about speed I also used PEiseler fifth wheel, Datron microwave and optical sensors. GPS is by far the best and used by all industry nowadays. (except Audi who uses Peiseler - likely the last ones not in a museum).
Your "thumb rules" are right.
Additionally you can increase sidewall maintaining the rim diameter and increasing tire diameter.
Also a bigger diameter tyre reduces rolling resistance all other things being equal.
I know very well the standard sizes. Your last one has a typo.
Next time I change I might go for 195/60 or 205/60 R17
Readthebook. Thanks. I try to validate all I do.
My next project will likely be the flat bottom at the rear. For this I will measure RR and Cd before and after installing it.
Speaking about swapping rear subframes from bushless, tubular style to AWD style with bushing. Maybe A3 8V rear subframe from 07.07.2014 onward may fit? As its used on FWD cars too (US 1.8T A3 8V, or any EU A3 8V with multilink)
From my little research, it look like they adopted a revised rear subframe from EU passat B8, as subframe from A3 strats with 3Q0 part number (the same as passat B8 rear subframes) instead of 5Q0 (bushless style subframe). Parts number for subframe its the same beteen A3 8V (3Q0 505 315J/K/L repaced by 3Q0 505 235 AH) and B8 Passat (3Q0 505 235 T/AA/AC replaced by 3Q0 505 235 AH).
It should fit FWD golf, as floorpan in FWD vs Quattro A3 8V is different (lower in FWD, higher in Quattro, as in hatch golf)