#31
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1) is rear window defrost
2) push to activate auto IC spray hold down to manually spray 3) got me on that one had to go look at the car. Never really noticed. It does nothing, and I dont know what it is. I'll need to figure that out since it now bugs me that I dont really know. 4) DAB settings. In the picture it's on 3 (0, 1, 2, 3) it's a thumb wheel type of switch 5) HOM switch activation. Push once to activate (turns on red LED) additonal questions: 1) the location of the red (HOM) and blue (IC sprayer) are up to the owner/installer of the toys option I put mine just under the boost gauge pod (which now is occupied by the DDS3). 2 &3) the toys switches are supplied in a panel (as in the picture) that directly replaces a cubby hole panel for cigs or glases etc... no drilling for the toys panel, but to install the LED lights you need to drill holes, again location of lights is up to installer/owner. Ps. I was planning on posting pictures of all the components (incl DDS3 in the former boost gauge pod), how do I do this? |
#32
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are you going to run into det (knocking) when turning the boost up on the std ecu mapping?
what boost are you running now? what will you be turning it up to? and when are you planning to inject the water? if the ecu is expecting race gas, it will be from tickover to top revs. if you inject water too late the hom may have been turned off already. Drew |
#33
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If the aim of WI is to replace race fuel, then the whole project should be simple. Based on that assumption, I suugest: 1) Detect teh HOM mode by monitoring the red led - when the WI sees the "low" signal from wire terminal #C14, it can switch on the water injection - may be some interfacing circuitry, but put that aside for the time being. 2) If knock presists after depression of gas paddle after WI is mapped, the HOM mode will drop out and so does the WI - until bigger jet is used or a new map is created. 3) If WI fails, the above will also automatically cancel the HOM by the ECU. What do you think?
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Richard L aquamist technical support |
#34
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post the url of that site between [img]url[/img] quotes. You can email me the pictures: richard@aquamist.co.uk, I should be able to do the rest. I have one more question, looking at the wiring diagram, can the wire such as the c14 accessable from the back of the panel?
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Richard L aquamist technical support |
#35
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"1) Detect teh HOM mode by monitoring the red led - when the WI sees the "low" signal from wire terminal #C14, it can switch on the water injection - may be some interfacing circuitry, but put that aside for the time being. " Answer: If I understand this correctly and the low signal is what makes the red LED blink the WI would be injected when the red light blinks. When the red light blinks, the the PCM has diababled HOM, too late for WI at this point. I think that when the DDS3 first sees a signal going from the HOM switch to the PCM it's time to turn on the WI is better. Quote: 2) If knock presists after depression of gas paddle after WI is mapped, the HOM mode will drop out and so does the WI - until bigger jet is used or a new map is created. Answer: I see no reason to stop water injection if if PCM sees knock. The PCM will bypass HOM if it sees knock, but WI can still run. IMO the DDS3 uses info to control WI components. The PCM uses info to control fuel, AND disable HOM if knock threshold is exceded (I have just way over simplified what the PCM actually does but please except this for the sake of reading this). I was just thinking about using the DDS3 to activate the HOM switch, it will have no control over it other then turning it on, after this DDS3 is done with HOM. The PCM still controls whether it will stay activated based on knock values. Above should also answer #3 in same post Quote: I have one more question, looking at the wiring diagram, can the wire such as the c14 accessable from the back of the panel? Answer: yes |
#36
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I'm using the factory supplied adjustment instructions for Stage II on the factory supplied stage II wastegate actuator. This yields for me about 16.5 -19.0 (conditions apply). Right now I dont plan on upping the boost since at this point I'm trying to concentrate on HOM without race gas. As far as when I plan on injecting water, the actual WI tune will be handled by same people who market the piggyback I'm using. They have a fair amount of experiance of using the piggy back to control the HSV plus they have a very good working knowledge of the SRT-4. So I dont know at this point yet. Because whether the HOM working or not is dependent on what the knock sensor sees and then feeds to the PCM, I think the key will be to find out when the car is near MBT since if I've read correctly this is where knock will be most prevalent. While road tuning and watching info via a ODBDII scanner I might be able to start a basic tune fairly close and then tune thu expermenting and datalogging till I can get the HOM light to stay lit. if it blinks I know the tune is off. [/quote] |
#37
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In order for the led to light up (HOM is ON), the c14 junction has to go "low". When the led blinks, the c14 junction will go "high, "low", "high", "low" etc. My logic tell me that when c14 goes low, it is at the "HOM" mode. The function of the HOM switch is not important as it is momentary so I cannot determine what state it is in after it was pressed until the red confirms it. It can also cancel the HOM mode after a momentary "press". Am I on the right track?
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Richard L aquamist technical support |
#38
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I think your right on the money. However understand YOU are better then I in reading and interpreting a wiring diagram, and understanding what the symbols actually mean (I have to look them up in a internet glossary).
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#39
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i see, so you can press the hom switch and get a few revs going before it turns itself off?
Drew |
#40
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I suggest the follwoing list of priority (order of importance): 1) Replacing high octane fuel at "HOM" mode 2) What action to take under water fault conditions 3) Actively disable the HOM mode or allow the ECU to switch off the HOM 4) Lower the boost pressure to wastegate setting by the DDS3 Question: The rate of injection is determined by the PSI-FI and how can we tell the PSI-FI that we are in HOM mode? At present the DDS3 will not know when the water should be injected so it cannot flag a logical fault under these conditions - it will only report that water is flowing or not. We can put an interface circuit to tell the DDS3 and PSI-FI at the exactly the same time that HOM mode is activated. Is there a spare input on the PSI-FI to that effect? Once we have extablished this, we can sail forward.
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Richard L aquamist technical support |
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