Lemmiwinks - S4wiki. What is Lemmiwinks? Named after an infamous Southpark character, lemmiwinks gives the average person access to a few parameters used by the Bosch ME7. While it does not allow the user to directly modify the internal boost/fueling/timing maps, let alone the control code responsible for interpreting those maps, it does allow quite a bit of customization. Of most interest, it allows quite a bit of control over fueling, which, in the case of the B5 S4, is probably the single most important parameter when using a larger turbo than stock. Of secondary interest is its ability to change the overall timing maps. However, ME7. 1's built- in knock sensor control loop somewhat limits the usefulness of this feature. In addition, Lemmiwinks allows changes to the speed limiter, parameters governing engine idle characteristics, and "specified load" scaling. This last function is unfortunately also of limited use. Even though target load is directly related to specified boost, the default value is 1. However, reducing overall boost can help prevent boost deviation which can cause throttle cut. Channel summary Ch. Name Function Increase/decreasing value result. Idle Speed Offset. Adjust idle RPM level. Increase/decrease idle (RPM). Fuel Tweak (Accel Pump) - Increasing Loads. Fuel trim tweak while load is rapidly increasing. Add/remove fuel (%). Fuel Tweak (Accel Pump) - Decreasing Loads. Fuel trim tweak while load is rapidly decreasing. Add/remove fuel (%). Start Up Fuel Enrich. Fuel trim during engine start. Add/remove fuel (%). Warm Up fuel Enrich. Fuel trim during engine warmup. Add/remove fuel (%). Lambda Regulation. Controls narrow band 0. Increase/decrease cycle time. Additive Offset To Speed Limiter. Increase/decrease speed limiter (km/hr). Secondary Fuel Tweak. Additive fuel term. Increase/decrease additive term (offset). Ignition Timing Offset. Adjust overall timing. Advance/retard timing (degrees). Primary Fuel Tweak. Multiplicative fuel term. Increase/decrease multiplicative term (%). SEL Scaling (Turbo Cars Only).
-any tuning tips with Lemmiwinks or Vag-Com that i can do to run better? What software? tuning tips with VAG-COM and Lemmiwinks ([email protected]). Lemmiwinks tuning Software Discussion in '1994-2004 V6 Mustang Tech' started by Nik_6, Oct 20, 2008. i found this Lemmiwinks software that with a usb. Bring up Lemmiwinks software 4. remember that is Narrowband and not nearly as accurate as required for proper tuning. EdyJun - Lemmiwinks for Dummies. Tuning with Lemmiwinks. More to come here. For now, check out Edy Jun's excellent Lemmiwinks Tuning Notes. How lemmiwinks works. According to Revo (the makers of. Software on request The Lemmiwinks program allows you to make changes to the adaptation channels and can be used to tweak the ecu. PLEASE note that making changes can. New Free Software by Revo 'Lemmiwinks' If this is your first visit. Real tuning requires map manipulation in certain areas of the table. Lemmiwinks ECU tweaking. including Free software to read your ECU and Write to your ECU. http://s4wiki.com/wiki/Tuning. Lemmiwinks: The guide. Revo Comparison of Adaptation Channels and Tuning Download Lemmiwinks Now from Ecodetuning. Bring up Lemmiwinks software 4. Scale specified load. Increase/decrease requested boost (%). Control Bits. 1. 4 Idle Torque Additive Offset. Controls engine load at idle. Increase/decrease spec load at idle. So, how does the ECU decide on injector on time, boost, and timing? One word: load. The ME7. The B5. S4 is completely drive by wire (a. Electronic Throttle Control or ETC), which means there is no direct connection between the accelerator pedal and the throttle valve. All the accelerator pedal does is tell the ECU how much the driver wishes to "accelerate". See also the Bosch ME7. Fueling curve. Primary and secondary fuel tweak. To simplify things, from here on out will we assume the injector on time is ONLY a function of MAF readings. At its simplest, the fueling vs MAF value curve is a straight line with two terms. For those of you who know geometry and algebra, call it y = a * x + b, where x is the MAF, y is the injector on time, a is the "multiplicative" term and b is the "additive" term. There are additional terms based on the slope of the MAF, but that will wait for later. To "enrich" the fueling across the board by a fixed percentage, one would increase the a (multiplicative) term, so the fueling is increased proportionally for every MAF value. For example adding 1. The "additive" value b does not have as much an effect near the top of the curve, because it is additive. In other words, adding a small amount everywhere means that the percentage increase of fueling for "high" MAF values is much lower than the percentage increase for "low" MAF values. For example, adding 1 to 1. What does this mean for lemmiwinks? It means that the primary (multiplicative) fuel tweak (channel 1. MAF readings! You can see what the ECU's own base additive and multiplicative "tweaks" are by examining the long term (LTFT) and short term fuel trims (STFT) with VAGCOM (blocks 3. ECUx. However, the ECU will only update these based on O2 sensor readings, and only during closed loop operation. Fuel tweak increasing loads and fuel tweak decreasing loads. Now, lets talk about those other terms - channels 0. Increasing and decreasing loads. Basically, those terms "tweak" the basic y=a*x+b by multiplying the overall result by a term that is dependant on the slope (or derivative dx/dt where x is load and t is time) of the load. That means the faster the load is increasing (or decreasing) the more this term affects the fueling. So the faster the load is going up, the more the "increasing load" term will adjust fueling. Similarly, the faster the load is dropping, the more the "decreasing load" term will change fueling. Note that load is rougly proportional to MAF/RPM. This means that load is "increasing" when MAF is increasing more than RPM, and that load is "decreasing" when the MAF signal is decreasing, or is increasing slower than RPM. In real life terms, load is "increasing" during turbo spool up. Once max boost is met, RPM is generally increasing faster than MAF. In this region, load is actually decreasing! EGT effects on fueling. EGT can effect the overall fueling. If EGTs are over approximately 9. C (1. 79. 6°F) the ECU will add fueling (and possibly pull timing?) to bring the EGT temperatures down. This effect can be seen in VAG- COM block 1. The functional range of the EGT sensor is 9. C to 1. 02. 5°C (S4 2. Self Study Programme, page 4. Block 0. 34 does NOT measure real EGTs, it is only a calculated value based on maps using load/RPM as inputs. Obviously, care must be taken when tuning the car under high EGT conditions, as the behavior of the ECU is radically different under "normal" conditions. A good rule of thumb is to try to get as much tuning as possible done under cool conditions and to make sure the intercoolers are not heatsoaked. Having an accurate picture of fueling and timing is critical to getting good results. Tuning your car under "artificially" enriched or pulled timing conditions simply means you run the risk of running lean or having too much timing under "good" conditions. The ECU will compensate using the knock sensor function, but it is better to get your car in the correct ball park for "normal" conditions. Tuning with Lemmiwinks. More to come here. For now, check out Edy Jun's excellent Lemmiwinks Tuning Notes. How lemmiwinks works. According to Revo (the makers of Lemmiwinks). Directly transferring the new adaptation channel values into the ECU. RAM memory location where the ECU stores the. RAM. memory locations. When the ignition key is turned off the ECU enters a. This roundabout method. Interestingly, this method will not work using the VAG mode protocol. Write access is allowed to any ECU RAM location except those locations. Someone at Bosch clearly knew about. But for. some reason this loophole was left in the KWP2. Each ECU code stores this adaptation channel data in different RAM. To make this method work with any ECU one runs through the. Establish communications with the ECU using KWP2. Read data directly from serial eeprom (since read access is allowed). Search for this data in the ECU's RAM. Write the new adaptation channel settings to the RAM location. Cycle ignition key to have ECU transfer the new settings into the serial eeprom. The KWP2. 00. 0 protocol is not as reliable as the VAG protocol. Some cars. will have communications problems which often can be worked around by. VAG- COM will be able to. DTC light before doing this!).[1].
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