Roland@pcmtec Posted November 1, 2018 Share Posted November 1, 2018 Circuit 1 4 Position switch in the cabin (no flex fuel). Position 1 E85 High Boost Position 2 E85 Low Boost Position 3 98 High Boost Position 4 98 Low boost Circuit 2: Uses a rotary potentiometer in the cabin (no flex fuel) E85 with variable boost (0-100% boost) 98 with variable boost (0- 80% boost or whatever you desire) Circuit 3: 2 position switch in the cabin (utilises the flex fuel kit) Position 1 Flex fuel with high boost Position 2 Flex fuel with low boost Circuit 1 Requires a 4 position single pole switch Circuit 2. Requires a 2 pole 2 position switch and a potentiometer. Circuit 3 Requires a single pole two position switch Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted November 1, 2018 Share Posted November 1, 2018 54 minutes ago, Roland@pcmtec said: E85/98 with a rotary dial for variable boost. Lemme just ask a stupid question here. Does this mean that you can still have a flex tune but have variable boost? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 1, 2018 Author Share Posted November 1, 2018 On 11/1/2018 at 8:00 PM, Puffwagon said: Lemme just ask a stupid question here. Does this mean that you can still have a flex tune but have variable boost? No flex. Only e85 or 98. Or you could do flex with a high low boost switch. Or you can use the flex fuel sensor and use the multi tune via the cruise control buttons to switch boost levels. 1 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted November 1, 2018 Share Posted November 1, 2018 I did think so but I wanted to be sure. Flex fuel with high or low boost on a more or less stock pcm is still pretty amazing. What more does the average to slightly crazy car enthusiast need? You guys are nailing it ? 1 Quote Link to comment Share on other sites More sharing options...
will15 Posted November 1, 2018 Share Posted November 1, 2018 10 hours ago, Puffwagon said: I did think so but I wanted to be sure. Flex fuel with high or low boost on a more or less stock pcm is still pretty amazing. What more does the average to slightly crazy car enthusiast need? You guys are nailing it ? So if we’re using the rear o2 input for the flex fuel, what input gets used for the high/low boost switch? Quote Link to comment Share on other sites More sharing options...
will15 Posted November 1, 2018 Share Posted November 1, 2018 Sorry that was meant for Roland Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 1, 2018 Author Share Posted November 1, 2018 36 minutes ago, will15 said: So if we’re using the rear o2 input for the flex fuel, what input gets used for the high/low boost switch? You use a single input. See the wiring diagram and blend tables. Quote Link to comment Share on other sites More sharing options...
will15 Posted November 1, 2018 Share Posted November 1, 2018 3 hours ago, Roland@pcmtec said: You use a single input. See the wiring diagram and blend tables. 3 hours ago, Roland@pcmtec said: You use a single input. See the wiring diagram and blend tables. 3 hours ago, Roland@pcmtec said: You use a single input. See the wiring diagram and blend tables. What diagram applies to flex fuel with high/low boost switch? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 1, 2018 Author Share Posted November 1, 2018 1 minute ago, will15 said: What diagram applies to flex fuel with high/low boost switch? The single pole 4 position switch. It has 4 positions E85 high, E85 low, 98 high, 98 low. You then setup the fuel and boost ramps as per the photo of the whiteboard. I will make up sample tables in the editor shortly. Quote Link to comment Share on other sites More sharing options...
will15 Posted November 2, 2018 Share Posted November 2, 2018 I see how to works with e85 or 98 tunes, but if your using flex with the o2 in put of 0 to 1.66 volts, and the ecu needs to see all of the 0 to 1.66 volts, how dose the ecu no if we want high or low boost or do you not use the hole 0 to 1.66 when doing this? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 2, 2018 Author Share Posted November 2, 2018 2 minutes ago, will15 said: I see how to works with e85 or 98 tunes, but if your using flex with the o2 in put of 0 to 1.66 volts, and the ecu needs to see all of the 0 to 1.66 volts, how dose the ecu no if we want high or low boost or do you not use the hole 0 to 1.66 when doing this? The two scenarios described wouldn't work with flex. A third scenario would be to use a flex fuel sensor and a high/low boost switch. I will add a diagram for this as well. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 2, 2018 Author Share Posted November 2, 2018 1 hour ago, will15 said: I see how to works with e85 or 98 tunes, but if your using flex with the o2 in put of 0 to 1.66 volts, and the ecu needs to see all of the 0 to 1.66 volts, how dose the ecu no if we want high or low boost or do you not use the hole 0 to 1.66 when doing this? It would be something like 0 to 0.7 v is the low boost and 0.8v to 1.5v would be high boost. So you would divide the resolution. I would then use a 3 pole switch to toggle between the normal flex setup to this. It's a bit tricky to work out the resistor values do I might wait and see if there is any demand for it first. Have to get my old electrical engineering books out to do the maths for the values. The alternative is get the can bus input working instead. Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted November 2, 2018 Share Posted November 2, 2018 37 minutes ago, Roland@pcmtec said: The alternative is get the can bus input working instead. That sounds like it will appeal to a larger audience and have a much wider range of uses. Quote Link to comment Share on other sites More sharing options...
will15 Posted November 2, 2018 Share Posted November 2, 2018 I just don’t understand how the voltagess are gonna work there would be so many different scenarios eg low boost e85 low boost 98 low boost e50, e60, e70 high boost e85, e70, e60 and so on and so on. We can do flex fuel and adjust boost/timing compared to ethanol Content but now I assume ? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 2, 2018 Author Share Posted November 2, 2018 42 minutes ago, will15 said: I just don’t understand how the voltagess are gonna work there would be so many different scenarios eg low boost e85 low boost 98 low boost e50, e60, e70 high boost e85, e70, e60 and so on and so on. We can do flex fuel and adjust boost/timing compared to ethanol Content but now I assume ? There are only 3 possible options. Danny Pirrotta will look at building a kit for all 3 including a value file so that people don't have to understand how it works. It will simply "just work". Circuit 1 4 Position switch in the cabin (no flex fuel). Position 1 E85 High Boost Position 2 E85 Low Boost Position 3 98 High Boost Position 4 98 Low boost Circuit 2: Uses a rotary potentiometer in the cabin (no flex fuel) E85 with variable boost (0-100% boost) 98 with variable boost (0- 80% boost or whatever you desire) Circuit 3: 2 position switch in the cabin (utilises the flex fuel kit) Position 1 Flex fuel with high boost Position 2 Flex fuel with low boost Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 2, 2018 Author Share Posted November 2, 2018 This is what the stoichometric vs volts (currently E85%) table will look like for circuit 3. That might help explain it a little. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 2, 2018 Author Share Posted November 2, 2018 1 hour ago, Puffwagon said: That sounds like it will appeal to a larger audience and have a much wider range of uses. Yeah right now this is something that will work and only took me half a day to draw up. Can bus will take us a few weeks so its lower priority than the datalogger and the next software update. 1 Quote Link to comment Share on other sites More sharing options...
Puffwagon Posted November 2, 2018 Share Posted November 2, 2018 Yeah mate all in time. ? 1 Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted October 25, 2019 Author Share Posted October 25, 2019 Update. The current uses cases described here are now redundant due to the multi tune. You could however use the same circuits to multiplex in a thermocouple, afr protection via a wideband or a low level switch from a water methanol kit. Quote Link to comment Share on other sites More sharing options...
FiftyOne Posted October 25, 2019 Share Posted October 25, 2019 So, assuming you wanted to just control boost maps, if could be done on the fly? no need to reboot the ECU between a different setting on the dial? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted October 26, 2019 Author Share Posted October 26, 2019 22 hours ago, FiftyOne said: So, assuming you wanted to just control boost maps, if could be done on the fly? no need to reboot the ECU between a different setting on the dial? Yes it could be done instantaneously with an infinite number of boost levels depending on what type of dial you use. Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted November 11, 2019 Author Share Posted November 11, 2019 All of these scenarios are now achievable using the cruise control multi flash tune (MFT). Quote Link to comment Share on other sites More sharing options...
FiftyOne Posted November 11, 2019 Share Posted November 11, 2019 Saw that on the video. Very cool Quote Link to comment Share on other sites More sharing options...
Craig Posted February 28, 2021 Share Posted February 28, 2021 Roland sorry to drag up an old thread but is the flex switching via option 3 only possible with the low boost and high boost or is it possible to have 4 or so options via a rotary switch (ea Falcon conversion car) say low boost, Medium boost, high boost and boost by speed with flex option on all of those ? Quote Link to comment Share on other sites More sharing options...
Roland@pcmtec Posted February 28, 2021 Author Share Posted February 28, 2021 Only what is listed is possible if you must use an external switch. Highly recommend using the multune as the options in this thread are fairly redundant and obsolete now, use a CANBarra module with the cruise control buttons wired up. Quote Link to comment Share on other sites More sharing options...
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