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08-09-2019, 05:50 PM | #45 | |
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#ladydriven Heavy-spec M3 // KW Clubsports // AA x-pipe // Gintani muffler // Macht-Schnell intake // Gintani tune // OMP Seats // Too Many Apex Wheels // Stoptech ST-60 // Cobalt Friction brake pads |
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08-09-2019, 06:06 PM | #46 | |
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I have been hearing good things about the AR1 and am excited to give them a try. The only problem with me is that everything I have is for sale so my testing is somewhat dependent upon nobody buying the wheels/tires prior to my next track day.
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08-09-2019, 06:10 PM | #47 | ||
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08-10-2019, 09:22 PM | #48 | |
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So I ended up going with a set of TE37s for now. I do plan on ordering a set of RIAs either in Diamond Black or Silver next spring in square size. The offsets are more conservative than the GT4 wheels but they still have a very similar look. |
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08-11-2019, 10:58 AM | #49 | ||
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I did an initial test fit of the GT4 wheels last night. 12mm front spacers are sufficient.
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08-14-2019, 11:20 AM | #50 |
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GT4 Wheels are on the car! They look fantastic and fitment appears to be a success.
Unique Wheel Property - This wheel has a back pad that is 15mm thicker than anything that I have seen. As a result, the stud required is at least 15mm longer than typical. There is no stud currently on the market that will accommodate this wheel with a 12mm spacer. BMW's own GT4 studs are designed to accommodate a 32mm spacer - yes you read that correctly - BMW is using a 32mm front spacer on the M4GT4! I am not sure why the wheel was built with that spec but my assumption is that it's due to strength requirements. As a result, we are working with MSI (leading stud manufacturer) to create a custom stud length for this wheel. GT4 by slicerM, on Flickr GT4 by slicerM, on Flickr GT4 by slicerM, on Flickr GT4 by slicerM, on Flickr GT4 by slicerM, on Flickr
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'23 X7
'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc. INSTAGRAM - @Slicer_M |
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08-14-2019, 12:30 PM | #51 |
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damn that fitment is meaty as hell. i really like how those wheel sit.
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08-14-2019, 04:07 PM | #54 |
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Soo, how much spacer is required to clear the strut? 12mm? so that would equal a 27mm spacer on a normal BMW spec wheel...hmm yah longest stud kit available is 90mm, and OEM length equivalent would be 62mm. that gives you a margin of 28mm on the 90mm stud, so seems like it would work...
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08-14-2019, 04:11 PM | #55 |
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3mm to 4mm plus this tire has a rim protector that protrudes 5mm. I may only need a 10mm spacer with a tire that doesn't have a rim protector
Pics: GT4 fitment by slicerM, on Flickr GT4 fitment by slicerM, on Flickr
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'23 X7
'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc. INSTAGRAM - @Slicer_M Last edited by slicer; 08-14-2019 at 04:54 PM.. |
08-14-2019, 04:46 PM | #56 |
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On my 18x11's, an effective offset of 22 is exactly zero clearance to the KW strut... So I would guess the 4mm quoted earlier is accurate. I ran with the ET22 setup for a while and have a nice little polished spot on the strut body to show for it. Added 2mm of spacer and all good now.
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08-14-2019, 04:50 PM | #57 | |
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90mm is the longest offered from the brands that I have considered. A 90mm stud is 90mm long including the threads into the hub PLUS the shoulder PLUS the threads used for the nut PLUS the bullet nose. The key dimension is the threads available from the face of the rotor to the end of the threads. On a 90mm stud from MSI that number totals 52mm. On BW's race studs that number totals 56mm IIRC. You rightly stated that the minimum needed is approximately 62mm (with a 12.5mm spacer) if you want a thread or two extra - which is wise IMO. Therefore I will be having special studs made with 65mm of thread from face of rotor hat. Edit - did not have studs made. Aborted project
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'23 X7
'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc. INSTAGRAM - @Slicer_M Last edited by slicer; 11-09-2023 at 10:28 AM.. |
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08-14-2019, 06:03 PM | #58 |
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Makes sense, i have dealt with lug nuts ripped off of studs in my shop due to a large spacer being used, its an ugly scenario. Definately want to make sure there are a few more than enough threads on the stud. I am constantly advising that people do proper research before throwing spacers onto a car, but not everybody listens or understands.
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08-14-2019, 06:18 PM | #59 |
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FYI guys, the just-announced Apex 18x11 forged wheels will be offered in ET29 and probably won’t have an absurdly thick back pad (in case anybody saw slicer’s pics and was still digging for their wallet)
And you can have them in not-black
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08-14-2019, 06:24 PM | #60 |
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i saw that! too bad they are not including the 18x11 in the pre-order group buy, would have made for a very cool option at a smokin deal.
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08-14-2019, 06:39 PM | #61 | |
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08-14-2019, 06:52 PM | #62 | |
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That being said, I would like to think there is a strength benefit to the thicker back-pad. The GT4 wheels are slightly lighter (less than 1 lb which is negligible). Then there's the fact that the GT4 wheels are an OE racing product- which brings with it the factory testing that only BMW can afford. Lastly I think that these wheels simply look fantastic.
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08-15-2019, 11:11 AM | #63 |
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Or...it's a race part which could mean they weight-optimized it and figure the race teams will replace with regularity - that thick back pad means a lot of that 20.3lb isn't in the spokes or barrel. But it's also pretty much the standard "as light as possible GT car" split-5 wheel design, so maybe that's most of the difference
I trust BMW Motorsport to field a quality competition product, but I don't trust them to give us stuff that lasts forever especially when individual GT4 teams are buying 5-6 sets of wheels *a year* due to carnage, long races means tire changes, flats destroying wheels yada It looks like the Apex 18x11 will cost right around the same - $600-650 each.
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08-15-2019, 12:32 PM | #64 |
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I'm with Richbot on this. A racing team has very different priorities from TT or HPDE guys. These teams want wheels that will last for the duration of the race (or maybe race weekend). They also have lots of spares and the means to get them quickly/easily, and the budget to support that.
Also, it is likely optimized for that specific car's load and handling capabilities. What is the load rating? Is a heavily modified M3 track car going to develop more cornering forces than the M4 GT4? It's still going to be a very solid wheel, don't get me wrong.
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08-15-2019, 10:03 PM | #65 | |||
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It's the opposite of what you are saying IMO. Many people on this forum buy cheap wheels thinking that "it's just a track wheel" "It's going to get trashed anyway". Professional Race teams don't think that way. They want the very best products that they can rely on. There are of course exceptions. Teams have budgets, and sometimes settle for a sponsorship deal for a product that isn't their first choice. Is the GT4 wheel the best, strongest, ultimate track wheel? I don't know. I don't have experience with the manufacturer (SAI) but they seem to have a solid resume. Based on what I have seen so far it has potential to be a winner. Especially for the money. I am all for healthy discussion on the forum. Please don't take my responses as anything but sharing of thoughts, findings, and opinions. I would like to think that most of my opinions are based on some logic, research, and testing. I do my best in that regard.
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'04 M3 - Fall Line Motorsports Built Race Car - S65 swap, Dry Sump, Bosch Stand-Alone ECU, Drenth Sequential Trans, MCS 3-Way, Flossmann Wide Body, Brembo Motorsports Brakes, Drexler LSD, BBS E88 Etc. INSTAGRAM - @Slicer_M Last edited by slicer; 08-15-2019 at 10:11 PM.. |
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