I've got a 535d, bought new in june 2005, tuned at http://hs-elektronik.com/. About 320hp en 660nm.
Before the HFM change, GPS-clocked acceleration 0-200 km/h (0-160mph) in 20.2 secs.
After the change (after 75000km or 47000 miles) now it rockets in just 18.5 secs !!!
他的車改了 H&S chip (320 ps/ 660 Nm) , 老當益壯 75000Km 保養後 , 0-> 200 Km/hr 進步到 18.5s
My advise to all of you is : DON'T wait untill you got check-control messages or other faults before replacing. Just do it every 75000km!! <= 作者筆誤吧 ?
至少每 7500 Km 做一次保養 , 別撐到保養燈亮
Mine was for free now due to warrantee, however next one will cost about 300 euros ( $ 450).
Believe me it's worth it. Also improved mileage!
Some other (tecnical) facts:
* it's a Bosch hot-film air mass meter. They just changed the BMW part number from 13.62.7.793.633 to the one I have now : 13.62.7.805.415. It's still Bosch, the plastic holes where you put the bolts in are reinforced now.
* no ECU re-programming or anything else needed. Just plug and play...
* first few hunderd meters it's learning (a bit unsteady rpm). Literally a minute a so later it's good to go...
* be aware also that the automatic gearbox is shifting quicker at high rpm since it's related to HFM signal!!
* last but not least : change the airfilter as well and DO NOT put a sportfilter (K&N) in it, since it's an open airfilter and would damage the HFM almost instantly.
BMW 啟用新款的空氣流量計, 料號 13.62.7.805.415 , 幾百公尺的里程後, 引擎即可完成學習
高速換檔更迅速 , 切記勿改裝 如 K&N 等高流量空氣濾心 , 流量計容易受損.
A bit off-topic, but just nice to know: ZF in Germany, the automatic gearbox factory, gives as maximum allowed torque 600 NM for our 26Z gearbox. My tuner convinced me that +10% is fair, so don't go beyond 660NM. So DON'T use a powerbox as a tuning device, because you don't know how much it will be then...
535d 這顆 ZF 製變速箱可承受 600 Nm +- 10% , 小小晶片改裝無妨 , 大改就要注意 扭力不要超過 660 Nm !
