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Note: All information and values given in this document may be used at own risk. I do not stand in for any problems. Thanks to the members from www.ecuconnections.com I hope you enjoy it. The rev limiter: The rev limiter works by cutting the fuel off. When the rpm has dropped below the rev limit there will be applied fuel again to the engine.
How much fuel is injected after a cut-off is regulated by the “deceleration injection after cut-off” map. So we want to change rev limiter to 7100RPM.
Open and search for value 01 01 54. When you found it deselect it. Skip one value and select next two and create map. Rev limit in WinOLS Calculation steps. 1) 90 03 2) 03 90 3) Convert to DEC = 912 4) 52200 – (912.50) = 6600 5) =45100 6) 45100/50=902 7) Convert to HEX = 03 86 8) 86 03 Injection maps Injection at Part Throttle In M1.7 are two tipes of maps: High part and low part throttle.
High part throttle is 7×12 map and looks like this Pic. 2 Injection at high part throttle Low part throttle is 6×12 and looks like this Pic.
![Tuning Tuning](http://obd-tuning-tools.com/standard14.jpg)
3 Injection at low part throttle The factor for RPM is 40, and the offset 0. The injection map does not have absolute values in it. The values are the correction-values for the, by the ECU, calculated injection pulse length. Injection at Wide Open Throttle The Injection at WOT is a 1×16 map which looks like this Pic. 4 Injection at wide open throttle The factor for RPM is 40, and the offset 0.
The injection map does not have absolute values in it. The values are the correction-values for the, by the ECU, calculated injection pulse length. Just like the closed and part throttle maps. To change this map in a good way you need a wideband lambda sensor (or a dyno) to achieve the proper Air Fuel Ratio (AFR).
Ignition at part throttle Ignition at part throttle just like in injection at part throttle, is two maps: high part and low part throttle. High part throttle is 7×12 and looks like this Pic. 5 Ignition at high part throttle Low part throttle map is 6×12 and looks like this Pic. 6 Ignition at low part throttle The factor for RPM is 40, and the offset 0. If you change this map I suggest adding not more than 10% ignition advantage. Also in that case using fuel with the highest possible octane number is recommended (95-101).
When you “over tune” this map it will result in damage to the engine. For proper tuning knock-detection equipment is needed.
Ignition at wide open throttle The Ignition at WOT is 1×16 and looks like this Pic. 7 Ignition at WOT The factor for RPM is 40, and the offset 0.
If you change this map I suggest adding not more than 10% ignition advantage. Also in that case using fuel with the highest possible octane number is recommended (95-101). When you “over tune” this map it will result in damage to the engine. For proper tuning knock-detection equipment is needed. Goodies for the 175 computer owner Since I wrote this file using the 175 computer from a BMW e30 318is with software 214 I found almost all usefull maps. Here they are: Checksum correction Before writing the bin file into the chip you need to correct the checksum.
For this procedure you need hex editor. You can download one from Open HxD and load your original bin file.
Now press Analysis Checksums Pic. 10 Hxd menu Choose Checksum-16 and press OK Pic. 11 HxD checksum menu Check out the result Pic. 12 HxD checksum result Now load your tuned file and do the same Pic. 13 HxD checksum result My original file has 71A4 checksum and my tuned file has 898C checksum. Tuned file’s checksum must mach to original file’s checksum. So we need correct it.
Open your calculator and set on scientific and on hex Pic. 14Win calculator You need to calculate the difernce between those two checksums. 898C-71A4=17E8 Go in. Correction must be done in darker places with FF’s Pic. 15 WinOLS hexdump Now when you know where correction must be done, go into HxD. Highlight FF’s and do the checksum till you get right value 17E8 Pic. 16 Checksum in HxD Now write 00’s instead of FF’s in the highlighted place.
17 Checksum correction in Hxd Now do the checksum again Pic. 18Checksum in HxD If it is a match to original the you are done! You can write the file into the chip now.
Chip installing When you wrote the bin into the chip you can install it know. Unscrew the marked screws and bend the marked metal. 19 ECU top Pic. 20CU bottom Open the case. You will see the black (not always black) plastic cover. Remove it and you will see the chip Pic21 Ecu inside Carefully remove it and install yours. 22 Chip and socket Done!
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