The ECU doesn't see instantaneous changes in ECT which might set I'd be inclined to hang a capacitor off all of that as well, so That should be your low limiter, pretty much. Measure the combined resistance of your 240 and the pot in series. Instrumentation shows just over 70C, and then disconnect and Try this: use your circuit as it stands when the engine is downĪround 40 or 50 C, switch on the hack and turn the pot until your Into this little region of fun a couple of times while developing To boil the coolant and to blast both radiator fans. To convince the car that it's above 70C, not tell it it's about I think your 240 ohm final-limiter is too low, I'd try more likeģ00 ohms at a minimum and possibly more like 470. Going to vary depending on how hot the engine really is, too. The nominal resistances you'll create based on that, and it's Thermistor and your fakeout in parallel, and have to calculate Remember that you've now got the original Your error conditions are likely because you're telling the system Although you may still be running a bit lessĮfficiently if the ICE is genuinely not up to operating temp yet. I would *hope* that the S1 cycle is still enforced, no matter You can't hurt anything if you aren't using it! OTOH the rest of us would want to mull it over before doing this to a normal hybrid. In Jay's case, where the main objective is to get the car into a state where he can drive without using the ICE at all, I think the risks are slim to none. I'm not as concerned about the emissions as I am about the possibility of killing that expensive piece of hardware. (Lean means abnormally hot exhaust.) More importantly, it may not be apparent to the driver that this condition exists. But a chronic lean condition could be hell on the catalytic converter since the thing is practically on top of the exhaust valves. This could result in rough running or failure to start, which is easily remedied by turning off the hack since the effects are obvious. Tricking the engine into thinking that it is already hot means that it would not get that extra fuel. A cold engine needs a little extra gas in the headers to make up for what sticks to the metal on the way into the combustion chamber before it heats up. I will report back when I get a few trips in with this hack.Īs much as I like the idea of instant S4, I would be very careful about skipping the initial warmup entirely. You could bypass the the whole coolant temp and set your own temp with the POT but then it would be a fixed value and you would not know how hot or cold the actual temp is getting. I made mine this way so I can still "monitor" the actual temp. You have to continuously lower the POT to keep this from happening. I do know with this setup you must monitor the temperature all the time while this circuit is on or you may cause the car to panic if the temp gets too high. I have not tried to get into S4 yet where I can start a glide from below 35mph. I have not got a chance to really test it from a cold start but I can say I can instantly get into a glide when I reach 35mph. Here is what my temporary setup looks like.Ĭoolant temp hack w/ adjustable rheostat. I'm leaving mine in my breadboard for now until I make an order from digikey to get the parts I need. Once you have the wires tapped hook everything back up and mount your POT somewhere. The green arrows are pointing to the wires. Here is what it looks like with the connector removed.įind the right wires and tap into them. the one with the gray connectors is the Hybrid unit. Just open it and on the right hand side remove the pneumatic arm that is attached to it. Pin 28 is where E2 is pointing and it is brown I think?įirst you need to remove the the lower glove box. Pin 19 is where THW is pointing and its a white wire. This little contraption get connected to the coolant temperature. ken1784 I hope you don't mind me stealing part of your picture. This is probably the easiest hack I have done that requires getting under the dash.Ī bread board of some kind or make some kind of mount to solder your components together.Ī knob and a place to mount your switch and POT.Īll credit goes to ken1784, Bob Wilson, and Hobbit and is based on this post here.
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