09-01-2024, 06:27 AM | #1 |
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M2 track build - my journey, tunes and track days
Had a track day today and put the G87 truly on test.
Specs: automatic, used manual mode, carbon roof, otherwise bone stock. No mods. tyres: 19/20 inch wheels, 275 front, 285 back, factory pirelli p zero, TW 300 Pressure: cold 2.2 bar, hot 2.7bar/70-90C Steel brakes, factory pads. Drove in M1 and M2 modes. Driver 90kg, passenger, 70kg Points to note: 1) The car has a huge torque at low rpms. Getting out from slow corners is a true challenge. 1-2 gears spin the wheels, traction works like hell or if in M2 mode, your gonna drift out. Needs lot of practising. With factory tires, you will not put the power down. Will try again with proper tires later. 2) Brakes... bad, really bad. No feeling at all, really hard to be consistent. They overheat very quickly. I almost smoked them in the first session and its miracle the car did not catch fire... 7-8 fast laps and you need 2-3 cooling laps. Brake duct caps were removed as needed. Is it the traction control that smokes them or the cars weight, don't know yet. Will need to test more. 3) Suspension - we need coils. Stock suspension is WAY too soft for hard tracking and probably gets much worse with semi slicks or even with proper street tyres. On hard brakings nose dives a lot and car becomes wobbly. I got very scared at fast corners where I had to start braking in the middle of the corner (170-180km/h to 80km/h, and braking in the middle of the corner quite heavily ) You don't want to try that, requires big balls. Suspension says WTF and tries to kill you. 4) Pads, 4 sessions, around 2 hour driving, 50% of them is gone. Consider that I was driving the wheels off the car, pushing max out of the vehicle. 5) M1 and M2 mode. M1 is way too restrictive. M2 is better, but you need to be very careful at corners you take with 2nd gear. It will go to drift mode very easily. 6) Fuel, consumes around 1 liter in a minute. 7) Some say steering is vague, I don't know, imo was fine. Brakes are vague for sure �� 8) Factory camber - Tire wear is nearly perfect. But as I cant change camber currently I really cant say if more negative camber would have helped with corner speed. Other than that, good car. In the same class with Porsche GTS. GT4 and GT4 RS and GT3s run rings around it. To compete with them You will need to find a way how to put the power down and how to get the car more stable. A bit wider tyres(305 square), upgraded pads, coils and some aero and you will be in the same league (around 10k euro investment). Have fun guys and watch for the brakes! Take cooling laps, they do really overheat extremely quickly. Also a video of one quick lap and racechrono image of the track and speeds. Last edited by priitserk; 09-23-2024 at 04:40 PM.. |
09-01-2024, 06:31 AM | #2 |
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Has anyone done coilovers install? Any recommendations? Did you get the car firmer/stiffer? With stock suspension its way too soft and I need to do something...
HAS kits most probably are not what I want. Yes they lower the car but most probably spring rates dont change. |
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09-01-2024, 08:38 AM | #3 |
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Time to bust out the wallet. And yeah, MPHAS is an extremely expensive, overpriced lowering kit. That why I skipped it. It’s like $3,100 on the 2025s. That’s coilover money.
https://europeanautosource.com/blogs...oilover-system https://europeanautosource.com/colle...w-g8x-m2-m3-m4 Get different/actual track pads and higher temp brake fluid. Lots of great knowledge in this and the brakes, wheels and suspensions sub forums to address all of your above concerns.
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DO_e9098.00 two_three_two1372.50 |
09-01-2024, 02:05 PM | #5 | |
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Brake pads - i'll take something from Endless series. |
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09-01-2024, 02:09 PM | #6 | |
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I'll get separate lightweight rims for track days and go with semi slicks. |
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09-01-2024, 02:52 PM | #7 | |
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The M2 is a fun track car in base form. It is a track monster after some good mods. I frequently pass Z08's, GT4's and GT3's of course they could be driving conservatively. Where do you have MDM set?
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2023 M2; MCS 3-way coilover, Vorshlag Camber plates, 19" Apex VS-5RS, 305 Goodyear 3R, SPL links, Adro wing, IRL exhaust, Racechip, Verus Splitter; IG:g87_43 |
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09-01-2024, 03:08 PM | #8 | |
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If you are driving right your rear pads will last 4-5 times longer than your front.
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2023 M2; MCS 3-way coilover, Vorshlag Camber plates, 19" Apex VS-5RS, 305 Goodyear 3R, SPL links, Adro wing, IRL exhaust, Racechip, Verus Splitter; IG:g87_43 |
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09-03-2024, 01:37 PM | #9 | |
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So, I'm not completely sure this is how it works, but this is what I've gathered from reading and their videos. Last edited by vranko; 09-03-2024 at 03:23 PM.. |
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09-03-2024, 08:32 PM | #10 | |
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This much I can tell you from real-world experience: Coming out of turn 11 at COTA, if my traction control is set to 6, my rear brakes will activate, the engine cuts power, and I exit the turn at around 30 mph. If I have my traction control set to 3 then the engine doesn't cut power, I don't notice the rear brakes, and my exit speed is closer to 45 mph. Also, I will get 6-8 track days out of a set of rear pads. Most people who have their traction control set to a higher number get 1-2 track days out of a set of rear pads. YMMV
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vranko113.00 dancing__narwhal187.50 |
09-05-2024, 12:21 AM | #11 |
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In the stock form, it's not incredible. Too much understeer too - to add to your list. The bare minimum "mods" will make it feel like a much different vehicle:
1. Track alignment 2. Brake pads 3. Brake fluid (SRF) 4. 200 TW tires It's a night and day difference. |
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09-05-2024, 06:34 AM | #12 |
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Can someone educate me a bit more on why the stock pads do not feel great initially at the track? With their G-G temp rating I think they would feel awesome for at least a few laps or even in fact the whole time but they would just wear through quickly. Why is the hot temp friction coefficient inadequate? Does track temp loading go even above that and then their bite falls away?
Several of the track pad compounds I looked at (that publish any temp vs friction data) actually show lower friction. So my assumption is that the track compounds just offer more life at the higher temps and not actually much fade resistance compared to a G-G rated pad.
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09-05-2024, 12:09 PM | #13 | |
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With that said- the pic below is not on stock pads; I wouldn't put the stock pads through hard braking like that. If you want a track-focused pad there are better track options but these will have downsides for day-to-day driving.
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09-12-2024, 11:53 PM | #14 |
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Agree. Stock pads are ok for short tracks with at least fluid upgrades. Stock fluid does boil quickly. 😁 I run pagid 626f fluid and am pretty happy with it. I inadvertently ran stock pads at Thompson in MA & iirc they were OK for 2 sessions before starting to smoke after the second session. They are not suited for time trials of course but their heat range before I guess falling apart is pretty decent. I am amazed the OP is getting good tire wear without camber plates. My front outside left has obvious camber wear. I think the balance is similar to the e36 where it didn’t have a ton of power (to weight) and you had to put your foot in it in order to get it to rotate. And it will rotate. Ask me how I know heheheh
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09-23-2024, 06:43 AM | #15 |
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Hi guys,
Thanks for the comments! So my track season is over, I'll do one more test day this year and then the car goes into hibernate for the winter. So Im in progress unlocking the ECU. Will ship to Finland this week. Also ordered already bootmod3 stuff. Lets see how much I can crank up the power. ZPD has correct data on rear brake pads and traction settings. As most of the time my TC was at 5, I was struggling to get speed up on exits. And yes, my rear pads are 50% gone. So I'll probably switch it off completely and let rear diff to do its work. Im going also to semi slicks and a bit wider tyre both in front and back. I'll keep updating the thread with mods I do and most probably in two-three weeks will post also a FEMTO and bootmod3 review + dyno run vids and numbers. Fingers crossed And what a heck did BMW do with the battery. It's HUGE. Weighed it and around 27kg - WHAT? LOL Next track day: 1) FEMTO unlock and chipped engine, 375-400kw should be doable 2) Semi slicks, still debating 305/R19 square setup or stick with F: 285/R19 R: 295/R20 + lightweight wheels (I guess the lightweight wheels are also a bit lighter than OEM) 3) KW coils (shaves off around 7-8kg) 4) Yellowstuff 5) Full Ti exhaust (shaves off around 5kg) 6) Will throw out passenger and rear seats (shaves off around 30kg) Will install everything myself, chipping is a bit difficult and will use professionals for that. Last edited by priitserk; 09-23-2024 at 06:54 AM.. |
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09-23-2024, 04:39 PM | #16 |
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ECU is out and shipping to Helsinki tomorrow.
And ofcourse I have the trunk issue 😂 Removed battery, closed the trunk and CLICK, lol. Trunk is locked now. Fortunately I unlocked rear seats, so need to do some crawling when the ecu arrives back home. Last edited by priitserk; 09-23-2024 at 04:45 PM.. |
10-02-2024, 05:31 AM | #18 |
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Great post, it shows that the car has a lot of potential. And the changes should be small in order to have fun at first. Completely different than the E46 M3 or the F series.
I just don't understand, on the one hand you want less power and better controllability? But then again more power with the ECU unlock. There is the Manhart M2 G87 with 700 hp, the car can hardly be driven at full power. I would recommend you invest in the Suspension and aero. This will make the car more stable and faster. As a tip, there is the KW HAS kit and there are now adapters to replace the form spring with a motorsport spring. You can then set slightly different spring rates. |
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10-03-2024, 02:24 AM | #19 |
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I tracked the factory pirellis. So far just one session at NJMP. Will be going to Watkins Glenn next week so we’ll see. I’m also in A group so take that for what you will. That said, I do have sim racing experience so hopefully I’ll be leaving the novice group sooner rather than later.
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