12-02-2024, 08:16 PM | #1 |
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G90 M5 JB4 is out!!
With lightning speed Burger Motorsports has released a JB4 for the G90 M5!!!!
https://burgertuning.com/collections...mt_2FSfrboNktP |
12-02-2024, 09:47 PM | #4 |
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This will be my first BMW.
I clicked the link and read through the details on the JB4. So it's truly a plug and play and doesn't throw any codes or need any additional tuning? Is that how their previous units have worked on previous gen M5's? |
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12-02-2024, 09:57 PM | #5 | |
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Here is the most basic description of how a piggy back works. Typically the ECU would take a reading directly from the sensor for something like boost pressure. If the ECU does read enough boost it calls for more, if it reads too much boost the ECU lowers. A piggy back is installed between the ECU and the sensor. You unplug the sensor, plug that wire going to the ECU into the piggyback, and plug the piggyback into the sensor. Now when the sensor reads boost pressure, the piggyback intercepts that signal and give the ECU a false ready. For example, when the sensor sees 16 psi of boost, it will imitate the signal from the sensor as if it is only reading 10psi. This tricks the ECU into making more boost and power. The JB4 is much more complex than this, but works on this principle. It tricks the ECU into thinking that it is getting different signals. |
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12-02-2024, 10:01 PM | #6 |
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Thanks Crazy. That makes perfect sense to me. Coming from a CT5 Blackwing and it was a very tough ECU to mod from my understanding so I never touched it. Sounds like the BMW ECU is a little more friendly.
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12-02-2024, 10:14 PM | #9 | |
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As far as the ECU knows, the car is 100% stock operating at stick power levels. Newer BMW ECU’s are actually quite a pain to tune. I don’t think they can be flashed, they have to have the entire ECU removed from the vehicle and sent to a special facility to modify it. |
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12-02-2024, 10:18 PM | #10 | |
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But they are probably srill doing some testing Hopefully in january i can use it I still need to get the car lol |
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12-03-2024, 08:48 AM | #12 | |
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If someone knows for a fact this is wrong chime in but that's been my understanding from using these on other cars in the past Also people should be careful with the gearbox, pretty sure this car is on the ragged edge of it's limits from the factory. Dynos make it look like they might've even tuned it to protect the box too but I'm not a expert on that stuff. |
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12-03-2024, 09:54 AM | #13 | |
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I will not go over map 2 Yes if bmw wants to check they can find out if it is tuned |
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12-03-2024, 10:43 AM | #14 | |
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I believe this is true because this is EXACTLY what the torque curve looks like for industrial gear systems (think big factories/plants). Electric motors are much easier to control the torque and RPM of as compared to ICE engines so they can be designed to act this way pretty easily. Remember Power equals (Torque X’s RPM’s)/Constant. In the case of Ft lbs and horsepower, that constant is 5250. From low RPM’s the motors are set to deliver a constant torque as parts start moving to prevent applying too much torque to any one component ans it overcomes inertia. As RPM’s increase, torque remains flat, so system power goes up. Now as RPM’s increase heat in the gears starts to builds up. To combat this the motor moves into a constant power operation. Now, as RPM’s increase the torque is reduced. This keeps the system power at a constant level as RPM’s go up. If you look at the stock dyno you can see nearly dead flat torque at 737 Ft Lbs (this is 1,000Nm, which is the transmissions rated torque from ZF). As the RPM’s increase, and so does heat. At about 5,250 RPM’s there is a nice linear decrease in torque that keeps power pretty damn flat at 700 whp. I would be shocked if it maintains a perfectly flat torque curve up to the “gearhead’s constant” of 5,250 RPM’s at which point it switches to a perfectly flat power curve accidentally. Also, that 737 Ft lbs is the exact amount of torque from the new Panamera Turbo S E-hybrid even thought it has more power. These likely use the exact same ZF transmission. The XM label also makes more power, but makes the exact same 737 ft lbs of torque. At lower RPM’s, torque kills transmissions. |
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12-03-2024, 11:49 AM | #15 |
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i am curious how this aircraft carrier will stop with another 100 whp... people truly forget this thing weighs 5500 lbs
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12-03-2024, 12:21 PM | #17 | |
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Panamera Turbo S E hybrid Gt63 E hybrid Neither of those cars are meant to turn... and neither of those are the tuners choice for this very reason.
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12-03-2024, 12:32 PM | #18 | |
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You have to remember, any electric motor is also a generator. The motor can effectively act like a 200hp engine brake. This likely depends on the charging limits of the battery, but may even be able to brake with more than 200hp, since that current would only be for a short time. I think this car will have plenty of brakes for whatever you throw at it, even with the standard steel brakes. CCB’s don’t really start to make a difference until you get into repeated heavy braking. But they look cool and are lighter |
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12-03-2024, 12:35 PM | #19 |
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12-03-2024, 12:43 PM | #20 |
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yes, except the x5m is an suv... and the other 2 both have lighter versions available that are ice only... and those are the tuners preferred choices
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12-03-2024, 12:44 PM | #21 | |
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12-03-2024, 01:06 PM | #22 | |
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If you mis-typed and meant tune then different story, but weight doesn't automatically mean a car can't rip through the twisties Last edited by iifymbro; 12-03-2024 at 01:14 PM.. |
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