Q: May I return to stock at any time with xHP? A:
Yes. Please get in touch and we can book an appointment to flash your TCU back to stock.
Q: How do I check if my vehicle is supported? A:
Please check using the compatibility tool above, or if you are not sure get in touch with your VIN and we can check for compatibility.
Q: Do I need to do anything differently once you have flashed the Gearbox? A:
The TCU will need to re-learn your driving characteristics, the best way to do this is for the vehicle to be driven as if around town for the first 50 miles, coasting as much as possible. Then a further 50 miles very steady, with no hard acceleration or braking. Then you can build up speed. The gearbox will take 2 - 3 weeks to learn your driving characteristics.
Q: How about reliability, will I shorten the life of my transmission using xHP? A:
Stage 1 and Stage 2 setups won’t have any effect on the lifetime of transmission components. Not on the TCU, nor on the shafts or clutches. Keep in mind, that automatic transmissions are highly complicated units, with a few hundred components inside. Some of these components are designed to wear out (like clutches) through making use of them. Your driving style and proper maintenance have the biggest impact on the life-time of transmission components. Obey these simple rules:
- Let your transmission warm up on each drive before applying heavy throttle. You will notice some amount of slip in the warm up phase, which is intentionally to heat up the oil inside. Basic Rule: Your transmission needs about the same time to heat up as your engine oil.
- Don’t “pump-up” your vehicle on standing starts with brake/throttle applied at the same time
- Flush/change your transmission oil regularly. (approx. every 50k – 75k miles) BMW does not want you to do it, but ZF wants you. Trust ZF, who have built this transmission.
- S and M modes are designed to facilitate sporty and fun driving. Shift times are cut and clutches get applied more aggressive. Use these modes when necessary and not as standard. The TCU records the amount of time you spend in each mode. BMW uses this data to judge on warranty cases.
Q: I just flashed my transmission, but the shifts are bad. A:
Your transmission may behave weird, right after flash, e.g. starting in 3rd gear. This issue should clear within a few hundred meters of driving. The transmission has extensive adaption-algorithms, to keep shift quality in check over a full life time and even with heavily worn out clutches. The adaptions applied, are very sensitive to abrupt changes, as they operate in a narrow window. Therefore, shift quality can suffer in the first few hundred miles, after doing an oil-change, replacing transmission hardware, or changing the TCU software, like with xHP. Don’t over stress your transmission during this adaption phase. The best way to adapt your transmission, is just normal driving in D mode with lots of varying speeds and shifts. We DO NOT advise anybody to clear the adaption values to speed up the process. Depending on the current wear state of your transmission, this can lead to unwanted and permanent bad results.
Q: I’m using MHD. What Map version should I flash? A:
If you are using MHD N54, use the xHP setting inside MHD. If you are using MHD N55, use the Alpina setting.
Q: I have a custom Tune, respectively tune my ECU by myself. Anything to watch? A:
A lot of the maps in the TCU use the PPS (Pedal Position Sensor) as primary input. For example, the Shift point –Maps and the TCC (Torque Converter Clutch) Maps. Therefore, it is recommended, to use the stock throttle mapping. This gives you greater control over the transmission’s reactions. Having too much torque on very low throttle will lead to an undesirable shifting behaviour. This is not special to xHP. The same applies to the stock transmission software.
Q: I already have a Flash - Tune (COBB, custom Tune etc.) on my ECU (Engine). Do I need to uninstall it before using xHP? A:
No. xHP has no direct effect on your existing Engine tune.
Q: I’m running JB4, can I use xHP with it? A:
Yes, xHP will work on JB4 equipped cars, but you have to remove it before flash and install again. On our test cars setting JB4 to Map 0 was not enough, as JB4 was still disturbing communication to the TCU. This possibly depends on the JB4 revision you are using.
Q: Will xHP void my OEM or dealer warranty? A:
xHP changes the calibration file on your TCU. Like every other tune on your vehicle, this will very likely void your OEM or dealer warranty, depending on your Country and/or guarantee contract.
Q: Is the use of xHP visible to the OEM tester at the BMW dealer? A:
The flash procedure itself leaves no visible traces at any place in your car. An OEM tester will not be able to directly detect the use of xHP. However, xHP enables you to change certain parameters (like max. RPM for shift) above OEM limits. Hitting those limits during driving can lead to records in other ECUs, which then can be possibly interpreted by the dealer in case of warranty matters.
Q: I installed the Stage 3 Map on my vehicle, but it’s still not shifting as quick as seen in some YouTube Videos! A:
You very likely refer to videos with a 5-Series car with Sport Automatic Option. BMW uses the same transmission on these cars, but they trick human perception by changing the behaviour of the rev-counter. Dampening is removed and the needle jumps instantly to the target value, before the shift of the transmission is even completed. The shift itself is in fact slower compared to xHP Stage 3 Maps. This “Sport Option” is a handshake between the ECU and the TCU controller. xHP activates the sport mode in the TCU on all vehicles, but it depends on your ECU, if it has this mode built in from factory. For example, 335i N54 cars do not have it, whereas 135i and 335i N55 sport it. Diesel 3-Series do not have this mode at all.
Q: Will my car be still updateable by the dealer? A:
If a customer updates his car with ISTA by himself or ordered and update at the dealer, the xHP map will be replaced with the stock map. You can just flash this car again, at no cost. xHP Pro will automatically carry out a long flash on such a vehicle. (Install + Map flash)
Q: I’m having “Dynamic Drive” Errors after the flash and can’t clear them. A:
The BMW Dynamic Drive system is pretty picky, when there is no CAN Bus communication for some time. On every flash, the CAN Bus has to be shut down for all other units in the car, so you can use the whole bandwidth for the flash operation and maintain a stable flash. After all returning to normal, the BMW dynamic drive has to recalibrate and re-align the position on all 4 wheels. During this procedure the system is inactive and will throw all kind of fault messages. Those errors can’t be cleared manually, you just have to wait for the system, to settle in again, which can take some miles/time. (up to 1 hour of driving, dependent on road surface) If you want to speed that up and have the knowledge, you may also relearn the units through the known BMW Tools.
Q: You flashed an xHP Map on my Pre-LCI 5 or 6 Series car, but I don’t see the Gear-Display in D-Mode? A:
Most of the 5 and 6-Series cars (before Facelift) where equipped with a faulty dash software, which is unable to display a gear number in S-Mode. When S-Mode is engaged, most of these cars display a red gearbox-error
sign in the dash. Therefore, the Gear-Display is not active in the xHP Maps for those cars. Unfortunately, there is no way of checking upfront, if a certain car is affected by that or not.