Using Idle Speed Motor with E6K?
I just got my Haltech and tried to search the forum on how many of you are using the idle speed motor. Just wanting to know if it's necessary to keep it for a good idle? I'm trying to simplify my engine compartment as much as possible and don't want to use anything that's not absolutely necessary.
Thanks in advance! |
If you are using A/C it is recommened that you keep it. Otherwise it is not needed for a steady idle.
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A/C= less HP's. Got rid of that a long time ago. Thanks dude!
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Hmm. . . . I can't help but bite on this one.
Please explain how A/C equals less HP???? BK BMEP Fuel & Tuning |
Re: Using Idle Speed Motor with E6K?
Originally posted by Bad2ndgen I just got my Haltech and tried to search the forum on how many of you are using the idle speed motor. Just wanting to know if it's necessary to keep it for a good idle? I'm trying to simplify my engine compartment as much as possible and don't want to use anything that's not absolutely necessary. Thanks in advance! I had my car set to idle at 1100 if the coolant temps were below 170degF. After that it would drop to 800rpms and stay there. Kinda like stock. I just found hitmans info that helped me in the past. I will attach. Anthony |
BAC
Here ya go!
HITMAN’S GUIDE TO SETTING UP YOUR BAC. Please note that this is a simple guide and some things may change from one car to the other. I am going to base this article on the Series 4/5 13BT motor, which so many on the Haltech list have. BAC , WHAT IS IT ? First of all a description of what BAC idle control is and what it does. BAC stands for Bypass Air Control. It is a system where a passage of air around is setup around the throttle plate to allow the engine to raise and lower in rpm. This variation of rpm is usually controlled via a 2 or 3 wire solenoid. This solenoid is pulsed at a particular frequency, which varies from solenoid to solenoid. It is the length of each of these pulses that determines how much air is allowed to go in. The larger the time the more the valve is head open and the more air goes in. The more air that goes in the higher the rpm. This is all controlled by the ECU. HOW DO I SET IT UP WITH MY HALTECH E6K? I will cover the 2-wire types here, but 3-wire BAC slave type systems are very similar. You should also not try and enable your BAC or fine tune it until your motor is completely tuned. Having tuning issues around the idle speed region will make it difficult to set up the BAC. The 2-wire types are very easy to wire up. All you need is to select a PWM wire that you have free, and run this along with a 12V+ Grey/Red wire to the BAC valve and connect them. It should not matter which pin is positive or negative. Now, if you go online with your Haltech, go to the PWM Output Options page by hitting CTRL-W. Go down to the PWM output number that corresponds the the wire you connected to the BAC, and with the TAB key toggle through until you get the BAC Valve option. When you do, hit the ENTER key. This will lock it in as the desired output. It will then give you two options under BAC Valve. One os to Enable or Disable the feature, the other is the Period (or frequency) at which the solenoid will be pulsed. This value is usually found through exper imentation, or by simply asking someone who has done it before. On the 13BT motor which I am using as an example, the I have found to work well is around 24ms. Others may find values that differ, so use whatever works best. Once Enabled the BAC output will start to function and now needs to be setup. Do not Enable the BAC at this point, we have other areas to cover first. Here is where it gets a little confusing. If you go to the Output Options page by hitting CTRL-O, you will see the Idle Speed Control feature. In order to use BAC this feature needs to be left DISABLED. The settings here will still work but only if left in Disabled Mode. If Enabled the E6K will think you are trying to run a 4-wire stepper motor for idle control, and not a BAC valve. What needs to be done now is to set the throttle stop. What we generally need to do is to setup the throttle stop to maintain idle speed around 50 to 150rpm below the Target Idle Speed we wish to obtain. Once this is done the throttle stop can be locked and the TPS will need to be recalibrated. If the TPS reads anything other than 0% or 0% Fault then the BAC function will not work. The next step is to go an Enable the BAC Valve PWM Output. Hit CTRL-W and go down to BAC Valve and change it to Enable. Once done go to the Output Options page and you can start adjusting the Idle Speed Control settings. Remember to leave this feature as DISABLED so that the settings will effect the BAC and not try to use the 4-wire stepper motor. IDLE SPEED CONTROL SETTINGS This is a short summary of what the Idle Speed Control settings do. This is based on Firmware 14 and software 6.34 which is the current release at the time. Some settings may differ if you are using another software and firmware version. Target Idle Speed - This one is pretty obvious. This is the idle speed that you wish the engine to be at under normal conditions. Cold Idle-Up RPM - This is the amount of RPM added to the Target Idle Speed when the coolant temperature is below the amount set under Cold Temp. Limit. Start RPM - The amount of RPM added to the Target Idle Speed for the first 20 seconds after starting the motor. It is done to help stabilise things. Number of Steps - This sets the increments in which the BAC is controlled. It is another word for sensitivity. I usually start around 100 and use trial and error from there. Cold Temp. Limit - The value under which the engine is considered to be cold. Cold Min Position - The minimum duty the solenoid will be pulsed at while the engine coolant temp is below the figure set in the Cold Temp. Limit. Hot Min Position - The minimum duty the solenoid will be pulsed at while the engine is at operating temperature. More on this later. Cold Opening Position - The duty at which the solenoid is run during cranking while the engine is below the Cold Temp Limit. It is to be set higher than the Cold Min Position and acts the same way as opening the throttle during cranking. Hot Opening Position - The duty at which the solenoid is run during cranking while the engine is at operating temp. It should be set higher than the Hot Min Position. HOW TO USE THE IDLE CONTROL SETINGS ON A REAL CAR After we have the car idling on the throttle stop and we have Enabled the BAC, this is the process to go through to obtain the best idle speed control. Setup should be done initially with the engine at operating temp, then later go through and do the cold engine settings. First we need to set the Target idle speed. Easy enough to do. If we want 900rpm idle then set it to 900. Next to setup is the Hot Min Position. This is rather simple to do. Set a target idle speed that is really low. Say 500rpm. This will cause the BAC to almost completely turn off and rely on the throttle stop to keep the car idling. If everything is working correctly then you should have the engine idling on around 800rpm if the throttle stop is correctly setup. What we do now is to increase the Hot Min Position until the revs start to rise. When we can get an idle just below 900rpm (the target idle speed) then the Hot Min Position is set. We can now change the Target Idle Speed back to 900rpm. Next on the list is to do the Hot Opening Position. To do this you set a value a little higher than the Hot Min Position. I usually add around 20% to it. Now switch off the engine and try to restart. If the engine revs are low and build up try adding more to the Hot Opening Position. Is the revs are too high then lower the value. The Start RPM can now be set. This just keeps the rpm a little higher for the first 20 seconds. A value around 100 or 200 is good enough for most applications. You will have to let the engine sit overnight to be able to do the Cold settings. These are done the same way as the Hot settings and will be almost always a higher value. Putting in values around 20% higher than the Hot values is a good starting point and adjust from there. First up is the Cold Idle-Up RPM. This can be set so that the RPM is a little higher to warm the car up faster, and is set to the users preference. A good starting point is 200rpm higher but a higher value is sometimes better. The Cold Min Position can now be set. Try increasing this value until the rpm rises above the Cold Idle-Up amount. ie if we have a Target Idle Speed of 900 and a Cold Idle-Up of 200 then while the engine is cold it will idle at 1100rpm. If we increase the Cold Min Position until the rpm just starts to go higher than 1100rpm, then drop it down a little we will have it set to its optimum. The Cold Opening Position can now be set in the same way the Hot Opening position was set. this will be higher in value than the Cold Min Position. That just about does it. If followed step by step all should work well. If you find the BAC stops working, try checking that the TPS still reads 0% at idle. If it fluctuates between 0% and 1% then contact me and I will show you how to get around this. |
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