08-06-2021, 06:29 PM | #1 |
New Member
12
Rep 19
Posts |
TA5R's with 245/35/18 Conti ECF
Just got my new set of wheels and tires mounted up on my 228i.
Hopefully these google photos link work.... https://photos.app.goo.gl/jFixTEPnJkzBiePRA https://photos.app.goo.gl/M8ydn2ZkYxb89mm87 The wheels are the Bimmerworld TA5R 18x8.5 38 offset. They are probably the maximum inward you'ld want to go- it is roughly 10mm clearance from the rim to the shock. https://photos.app.goo.gl/ev3PcvPqCkqas7zR9 Figured I'd share a couple quick measurements as well. The tire mounted up has a section width of about 9 7/8" (Tirerack spec is 10.1"). It has a very thick "rim/bead protector" that protrudes past the surface of the wheel about 7-8mm. https://photos.app.goo.gl/vHu9gVzeATTsssQ78 https://photos.app.goo.gl/wujt2f7btgMt7erd9 https://photos.app.goo.gl/6bN68UVf6RydFrTi7 Fender clearance looks good- both front and rear. Haven't noticed any rubbing driving it around the block. Only thing that might be close is the front shock clearance. But I don't see any rubbing on the shock yet from just driving it around town, but it is only 2-3mm of clearance due to the thick "rim protector" section. I've got Camber plates up front and running -2.5 front camber and -2.0 rear camber. |
08-08-2021, 08:32 AM | #2 |
New Member
12
Rep 19
Posts |
Decided to give the new setup a test at the Autocross.
Here's a video of my quickest lap: (sorry about the wind noise!) https://youtu.be/3AdJ8cxSJVo Looking at the SoloStorm data, I probably could have knocked off another .3-.4 (the second half of this run wasn't my best). The balance of the car with the square setup and camber on the front is so much more enjoyable to drive! This is how the car should come from the factory! I ran 33psi front, 36psi rear. Tires felt really good. We got 6 runs, and it was over 90 degrees, and the tires never felt greasy or overheated. So I think that's a pretty good sign that these tires are going to be a more durable trackday tire. Wear on the shoulders was not bad at all either: https://photos.app.goo.gl/bt4GHXEH7XywXzPeA Also, despite the minimal clearance to the shock, I didn't see any signs of the front tires rubbing on the shock body, so should be good there. SoloStorm data had lateral G's topping out in the 1.1-1.2 range (It's just using the phone accelerometer, so take that with a grain of salt). Also this particular lot isn't the grippiest as it's an asphalt lot and typically a little dirty/gravelly. |
Appreciate
1
dradernh4371.50 |
08-08-2021, 05:16 PM | #3 | |
Brigadier General
4372
Rep 3,494
Posts |
Quote:
2) The tire will move away from the front strut under load, so you usually don't get rubbing at speed that you didn't have at rest. 3) To produce accurate results, stand alone accelerometers are meant to be mounted at the car's center of gravity. To get close to that point, the instrument is frequently mounted somewhere on the transmission tunnel. Looking at SoloStorm documentation, it has a calibration procedure for mobile devices; did you use that procedure to calibrate the software? It would be interesting to hear from Petrel Data what the margin of error is in the result produced by a mobile device calibrated using their procedure. (I have no idea if it's a little or a lot – just curious is all.)
__________________
2017 M240i: 23.8K, 28.9 mpg, MT, Sunroof Delete, 3,432#, EB, Leather, Driving Assistance Package, Heated Front Seats | Sold: E12 530i, E24 M635CSi, E39 520i, E30 325is, E36 M3 (2)
TC Kline Coilovers; H&R Front Bar; Wavetrac; Al Subframe Bushings; 18X9/9½ ARC-8s; 255/35-18 PS4S (4); Dinan Elite V2 & CAI; MPerf Orange BBK; Schroth Quick Fit Pro; GTechniq Crystal Serum Ultra Ceramic; Suntek PPF |
|
Appreciate
0
|
09-16-2021, 10:41 PM | #4 |
New Member
12
Rep 19
Posts |
Went to my local track, Harris Hill Raceway, for SCCA Tracknight last night.
this was the first time out at this track in this car, so I don't really have any data to compare to. I do know that I surprised a few M3's and 335's that were running in my session. I had nothing on the M2 though, had to give him a point by Here's a quick video of my quickest lap: https://youtu.be/DdXmQr23uAI I still have a pretty minimal "setup" wheels and tires mentioned above, Front camber plates (-2.5 degree front, -2.0 deg rear camber) I recoded my iDrive to show Tire pressures and temps. That was actually pretty useful to see live data like that (those front tires get hot!). Anyone else tracking an Automatic? I have just been driving it in the Sport Auto mode. It looks like it might be beneficial to manually downshift. The revs seem a bit low on some of the slower corner exits and wondering if the engine braking might help get a little more rotation on corner entry. |
Appreciate
1
msendit419.50 |
09-17-2021, 01:43 AM | #5 | |
First Lieutenant
420
Rep 322
Posts |
Quote:
|
|
Appreciate
0
|
09-17-2021, 03:27 PM | #7 | |
New Member
12
Rep 19
Posts |
Quote:
|
|
Appreciate
0
|
09-17-2021, 03:31 PM | #8 |
New Member
12
Rep 19
Posts |
Thanks! I've done this track a couple times over the years in a couple different cars. This was the first time in the BMW. It's a fun track, and probably the most accessible to me, so will be a good one to "test" on if I can get out there more often.
|
Appreciate
0
|
09-20-2021, 08:09 PM | #10 |
Lieutenant
433
Rep 442
Posts |
I track an automatic, and I will second that you really want to be in manual mode. Even with the fat torque band of the turbo, keeping the revs up is critical to a fast corner exit. Also, it's much better to know WHEN the shift is going to happen as you are negotiating the corner. If the shift occurs randomly it can upset the balance of the car when you aren't expecting it.
|
Appreciate
0
|
Post Reply |
Bookmarks |
|
|