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Q) With so many tuners now on the market, why do you state that the SLM tuner will not work with ‘heavily modified’ engines, such as those with larger cams and maybe some head work. Why will this unit not support engines with those upgrades when just about every other tuner does? A) The SLM module is limited to heavily modified engines, the SLM will support camshaft upgrades to a limit. The camshafts listed as a maximum of 0.520 lift for 88ci to 103ci and 0.535 / 0.580 lift for 96ci to 110ci models, which are designed camshaft profiles that are true fuel-injected designed camshafts, and not carbureted camshaft profiles. Installing the SLM along with the listed camshafts are perfect for upgrading without the need for additional engine work. The SLM will also work with aftermarket replacement ECU's, H/D update calibration files, and RACE Tuner calibration files. Any tuner that is a piggy back unit like this (for example: all power commandes) that are controlling the stock ECU and not replacing it. They have the same situation. The constraint in the system is how far the stock (or any) ECU can be adjusted. The difference here is, we are the only ones making sure the customer knows that. Now, complete performance ECU units like Zippers, Daytona twin Tec, and S&S are a replacement computer with much wider parameters to accommodate the more radical applications. The ACCEL SLM can be installed in conjunction with those complete ECU's and can make them an auto-tune situation as well.
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Q) The text I read leads me to believe that the early model H-D units only have one O2 sensor included in the kit. Why is it not a 2 sensor system? It is my understanding that the info on any of these systems in reality is obtained from the rear cylinder? A) The SLM requires 1 O2 sensor in the rear cylinder exhaust header because the temperature is higher there compared to the front cylinder. The SLM requires the information from the O2 sensor which the SLM module uses as input data. The SLM sends filtered input data to the TPS sensors allowing the ECU to make the necessary fuel and ignition adjustments based on the factories preset calibration files. Its important to install the O2 approximate 6 inch from the cylinder head exhaust port for the SLM to receive accurate readings.
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Q) What is the target air/fuel ratio on the SLM module fuel injection tuner? A) The SLM unit operates along with the factories preset fuel/ignition calibration files, along with the Delphi's "ION" ignition system. The SLM module and Delphi ECU are trying to produce a stoichiometric mixture of air to fuel ratio of 14.7 to1 with/no load, and with load the reading may be as low as 12.8 to 13.5 as an example. The SLM module has a closed throttle mode which will exceed above the 14.7 to 1. value, which the air to fuel ratio will reflect the factories preset fuel/ignition calibration files.
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Q) I just purchased your ACCEL SLM Module and have installed it with a number of other upgrades to my Harley. I would like to run the bike on the dyno and would like to know if there are any guidelines to running the bike on the dyno with the SLM unit? A) When performing a dynamometer evaluation, the follow steps should be considered to achieve correct results and understanding with the operation of the SLM module and your motorcycle.
STEP 1
After all basic set-ups operations have been performed to secure the motorcycle to the dynamometer, correct tire pressure, correct tire alignment on roller drum, and correct air/fuel meter installment in the exhaust system.
STEP 2
Allow the motorcycle to reach operating temperature to allow the SLM module to go into the closed-loop mode, this is identified after approximately 60-90 seconds. At this time the LED on the SLM module will flash from a RED/GREEN status, to a flashing GREEN status which means that the system is now in a closed-loop mode. At this point you are now ready to perform you evaluation.
STEP 3
When performing your evaluation its recommend that when applying the throttle, that there may be a variation in your final results due to the way in which you apply the throttle. For example in a 0-10 second time in which the throttle is applied, its recommend that the throttle be applied gradually to allow the SLM module time to evaluate the O2-sensors readings to make the necessary fuel and ignition adjustments. When performing each evaluation run allow the O2-sensor to stabilize, which will reset the calculations of the SLM module and the systems O2-sensor. This should be performed between each evaluation pass to conclude the most accurate results.
STEP 4
When using a electric load dynamometer a load can be applied, by applying a 20%-30% load in low to high gear, you should allow a roll-off deceleration closed throttle, to allow the SLM module and O2-sensor time to reset and stabilize to obtain the most accurate readings. The most accurate way of monitoring the reading of the actual air/fuel reads is to mount a stand alone air/fuel meter to the motorcycle and perform a real-time road-test evaluation.
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