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      02-03-2025, 01:46 PM   #1
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M240i X-Drive G42 Track Day HPDE report

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Just a quick report on how good the M240i (mostly stock) is for track day use...

Track: Buttonwillow 13CW (California)
Number of laps: 90, mostly hot laps
Lap times: between 2.01.xx and 2.02.xx
Engine: stock
Engine oil: Rennline 0w20
Camber plates: Vorshlag
Brake pads: Hawk 60/30
Brake fluid: Motul RF600
Tires: Bridgestone R71Rs, square 255/40-18
Wheels: Apex VS-5RS 18"

Even though it was the first time driving this car on track, I drove with all electronic aids off (traction control and DSC). No problem at all. The rear went loose a few times, easy catch, the x-Drive system being probably helpful here.

The car is fast, the suspension in Sport+ is firm enough with no boucing or diving while braking. The "loud" exhaust in this mode is way too quiet for the track, you hear mostly the other drivers.

The engine didn't miss a bit, the engine oil temperature was the same than when cruising on the highway. I was really impressed as I was pushing hard. Shifting with the paddle was a no brainer, crisp and fast up & down.

The tires—while doing a good job overall—did overheat even with pressure kept around 32psi hot. Thanks to the camber plates, the shoulders are fine on all tires. However, the center threads took a hit, especially in the front. You can also see on the pictures that the tire texture show some clear signs of distress LOL. Maybe this tire degradation is normal on this tire, maybe it's a proof of pushing too hard, maybe it's temp related? Anone who knows is welcome to offer advice. I was expected more endurance from this set tbh.

Conclusion: the car was fast and reliable. Went back home cruising in silence on the highway, 30 mpg and no rattles. Can't dream of a better dual use car!

Long story short: If you wonder about tracking your M240i X-Drive, just do it!
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Last edited by 623; 02-03-2025 at 01:52 PM..
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      02-03-2025, 02:58 PM   #2
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Did you opt for the additional cooler package (ZTK)? I assume no since I don't see the fender arches? Good to know that cooling was not an issue if you are on the non-ZTK setup.

Also happy to hear no rattles LOL. I just spent a bunch of time and effort to get rid of a bunch of rattles in mine, but I want to track it a little this summer, but rattles are always a concern with that type of use.
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      02-03-2025, 03:07 PM   #3
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Nice! Great to see these cars properly used!

That hot pressure was awful low for street tires. Running 38psi would have helped the issue. Street tires don't like low pressures like track tires do.
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      02-03-2025, 03:10 PM   #4
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Littlecoupe No cooling package for me.
tbh I don't really like the idea of the additional oil cooler being so close to the ground.
The engine oil temp never went above 232F, which is basically what I gewt during normal driving. It was 226F by the time I was half-way in my cool down lap...
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      02-03-2025, 03:13 PM   #5
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Quote:
Originally Posted by M2M3M3 View Post
That hot pressure was awful low for street tires. Running 38psi would have helped the issue. Street tires don't like low pressures like track tires do.
Funny, I kept removing air through the day to keep them at 32psi... I don't know where I found the info but I had this 32psi limit in my head as the recommended pressure for track use. I probably assumed that the R71Rs was some sort of a track tire disguised as a DOT tire?
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      02-03-2025, 03:17 PM   #6
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Wow so stock aside from tires, pads, and brake fluid... without the ZTK pack and you were find after 90 laps!

Honestly makes me question if the $2,400 ZTK package is worth it haha (still like the bigger brakes and nicer wheels, but hate you have to buy an aftermarket oil cooler shield).
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      02-03-2025, 03:40 PM   #7
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Quote:
Originally Posted by Ricochet48 View Post
Wow so stock aside from tires, pads, and brake fluid... without the ZTK pack and you were find after 90 laps!
The external temperature was pretty low though, barely reached 70F, so it might have helped?

Quote:
Originally Posted by Ricochet48 View Post
Honestly makes me question if the $2,400 ZTK package is worth it haha (still like the bigger brakes and nicer wheels, but hate you have to buy an aftermarket oil cooler shield).
The brakes are not really bigger, the rotors are. So it's more weight, while my stopping power was way enough. I agree with you, $2,4k is a lot for something you might no need and adds extra weight and reliability concern...
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      02-03-2025, 03:44 PM   #8
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Quote:
Originally Posted by M2M3M3 View Post
Nice! Great to see these cars properly used!

That hot pressure was awful low for street tires. Running 38psi would have helped the issue. Street tires don't like low pressures like track tires do.
I noted the temps for all tires (inside/center/outside) after every single session and it went up indeed through the day, from basically 130F to 160F. It goes up logically when the track temps raise, but you might be onto something here. It looks like removing air to keep the tires at 32psi hot didn't make them so happy...
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      02-03-2025, 05:50 PM   #9
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Quote:
Originally Posted by 623 View Post
I noted the temps for all tires (inside/center/outside) after every single session and it went up indeed through the day, from basically 130F to 160F. It goes up logically when the track temps raise, but you might be onto something here. It looks like removing air to keep the tires at 32psi hot didn't make them so happy...
Low pressures increase tread squirm, which adds heat. Street tires also don't have the sidewall stiffness track tires do. They need more pressure to be stable. Flex = heat.
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      02-03-2025, 08:05 PM   #10
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Quote:
Originally Posted by M2M3M3 View Post
Low pressures increase tread squirm, which adds heat. Street tires also don't have the sidewall stiffness track tires do. They need more pressure to be stable. Flex = heat.
This makes total sense. It also explains the "ripple" pattern I can see on the surface.
One additional question for you - or any other knowledgeable member - about these tires: although the center is pretty beaten up, the rest seems ok-ish. Would you guys keep running them until bald or is it safer to change? Saving $$ is always tempting but safety comes first, right?
Let's see what you guys think!
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      02-03-2025, 08:48 PM   #11
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Could you post a bit more details about brake pads - what sort of part numbers did you buy/where did you get them? Did you swap back to street pads after that or do you just Hawks as dual duty? If the latter - how are they at that? Any specific bedding procedure you performed?
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      02-03-2025, 11:38 PM   #12
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I did a post about brakes for the G42 HERE. I'm afraid it was in the wrong section (G87) but nobody complained ;-)

But to answer your specific question, I had them made on order at Porterfield in Costa Mesa (https://porterfield-brakes.com). They took the time to find a shape that would fit our vehicle and then built the pads for it. Perfect fit, no problem, very reasonable price.

Part#:
Front: AP280 DTC-60
Rear: HB917W.626 DTC-30 (W)

On track, they work perfect. In the city, they are only noisy at very low speed or coming to a complete stop. Nothing crazy. I went back to OEM pads so the track pads wouldn't be too hard on the rotors when cold. I just swapped the front though as I have another event in a couple weeks.

No bedding procedure, just a few hard brakings on track and that was it. Putting back the OEM didn't request any sort of cleaning. No noise, same braking power than usual. I hope it helps!
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      02-04-2025, 09:23 AM   #13
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Quote:
Originally Posted by 623 View Post
The brakes are not really bigger, the rotors are. So it's more weight, while my stopping power was way enough. I agree with you, $2,4k is a lot for something you might no need and adds extra weight and reliability concern...
This is incorrect, the ZTK pack does include a larger 374mm disc, larger caliper, and different shaped, wider brake pads.

It’s the same brakes you get with the Alpina cars.

I know this because I’m currently swapping my brakes on my ZTK car for a trackday.

In the UK at least the ZTK pack is split into two options.
The wider 893M wheels (which is the bulk of the cost)

Then an optional increase for the “M Technical package) extra oil coolers (in fenders not under car on EU models), larger discs, bigger calipers and bigger pads.

When I optiond my car that was only a £300 increase so seems worth it. However this does require you also option the 893M wheels.

Of course if you don’t want the 893M 19 inch wheels then it’s a lot extra to pay.
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      02-04-2025, 09:38 AM   #14
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Quote:
Originally Posted by 623 View Post
The external temperature was pretty low though, barely reached 70F, so it might have helped?


The brakes are not really bigger, the rotors are. So it's more weight, while my stopping power was way enough. I agree with you, $2,4k is a lot for something you might no need and adds extra weight and reliability concern...
One big factor for me was it comes with Michelin Pilot 4S* tires. Those alone with the wheels make the package very attractive.
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      02-04-2025, 09:39 AM   #15
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Quote:
Originally Posted by 623 View Post
I noted the temps for all tires (inside/center/outside) after every single session and it went up indeed through the day, from basically 130F to 160F. It goes up logically when the track temps raise, but you might be onto something here. It looks like removing air to keep the tires at 32psi hot didn't make them so happy...
In sport+ mode did the tire temperatures display on the instrument panel in the car like on the M2?
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      02-04-2025, 10:01 AM   #16
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Quote:
Originally Posted by 623 View Post
I did a post about brakes for the G42 HERE. I'm afraid it was in the wrong section (G87) but nobody complained ;-)

But to answer your specific question, I had them made on order at Porterfield in Costa Mesa (https://porterfield-brakes.com). They took the time to find a shape that would fit our vehicle and then built the pads for it. Perfect fit, no problem, very reasonable price.

Part#:
Front: AP280 DTC-60
Rear: HB917W.626 DTC-30 (W)

On track, they work perfect. In the city, they are only noisy at very low speed or coming to a complete stop. Nothing crazy. I went back to OEM pads so the track pads wouldn't be too hard on the rotors when cold. I just swapped the front though as I have another event in a couple weeks.

No bedding procedure, just a few hard brakings on track and that was it. Putting back the OEM didn't request any sort of cleaning. No noise, same braking power than usual. I hope it helps!
Porterfield is a great company to work with. Highly recommended!

The DTC-60 is really a track only endurance racing pad. Great for HPDE's as they last a long time. Not that good on the street as they never get up to operating temp. Similar to the PFC97 i mentioned in your other thread. Glad you are having fun!

Last edited by M2M3M3; 02-04-2025 at 10:05 AM..
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      02-04-2025, 10:28 AM   #17
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Quote:
Originally Posted by 623 View Post
Funny, I kept removing air through the day to keep them at 32psi... I don't know where I found the info but I had this 32psi limit in my head as the recommended pressure for track use. I probably assumed that the R71Rs was some sort of a track tire disguised as a DOT tire?
Many people start around 30psi cold and adjust from there. 32psi hot is low as others have mentioned. Looks like you had a great time!
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      02-04-2025, 10:48 AM   #18
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Quote:
Originally Posted by 623 View Post
Funny, I kept removing air through the day to keep them at 32psi... I don't know where I found the info but I had this 32psi limit in my head as the recommended pressure for track use. I probably assumed that the R71Rs was some sort of a track tire disguised as a DOT tire?
36psi seemed to keep the RE71R happy. I figure it would be the same for the RE71RS.
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      02-04-2025, 11:07 AM   #19
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Quote:
Originally Posted by AdonisP91 View Post
In sport+ mode did the tire temperatures display on the instrument panel in the car like on the M2?
The screen options between M2/M240i are different (no track display on the M lite), but the M240i displays all the gauges on the big right screen, so you can monitor the oil temperature not moving ;-)
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      02-04-2025, 11:10 AM   #20
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Quote:
Originally Posted by M2M3M3 View Post
Porterfield is a great company to work with. Highly recommended!

The DTC-60 is really a track only endurance racing pad. Great for HPDE's as they last a long time. Not that good on the street as they never get up to operating temp. Similar to the PFC97 i mentioned in your other thread. Glad you are having fun!
Long lasting track-only pads is exactly what I was looking for. So far, they fulfilled their mission. I might try the iSweep s4000 soon just to compare both.

And yes on Porterfield, friendly and helpful people

Last edited by 623; 02-04-2025 at 12:07 PM..
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      02-04-2025, 11:12 AM   #21
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@6SPDG82 and @jmg

Ok, thank you guys, this will be my baseline starting now.
I'll run these tires once more, hoping they will last at least a half day with what's left.

Last edited by 623; 02-04-2025 at 11:26 AM..
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      02-04-2025, 11:24 AM   #22
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Quote:
Originally Posted by Evilmoretea View Post
This is incorrect, the ZTK pack does include a larger 374mm disc, larger caliper, and different shaped, wider brake pads.
According to what I was told at the dealer, the rotors being bigger they adjusted the calipers (mounting points) and the pads are slightly wider. But it's marginal differences, not like going from a 4 piston caliper to a 6 piston for example. That's what I meant when saying that the rotors are the main difference. Is it worth the extra weight for potential better cooling? Idk Again, in the US, it's part of what they call the "cooling" package. What is certain though, is that this kit prevents you to mount 18" wheels

In the US this cooling pack comes with an extra oil cooler that might be very appealing to people tracking in hot summer. It's still situated in a weak spot and you need to purchase an extra protection aftermarket. This should be a standalone option IMO as you might want this radiator and not the bigger brakes if you plan on tracking...

Long story short, I was really tempted by this cooling package but talking to the dealer - who told me that they basically never sell one - dissuaded me. Time will tell if I regret it, but for now, the cooling on this car has been exceptional...

Last edited by 623; 02-04-2025 at 11:42 AM..
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