Hi guys, so January 2016 I have converted my RX-8 to LPG. Frowned upon by many, but given the fact that the Renesis is guaranteed to crap out on me before 200.000 on whatever fuel it runs, I went with the cheaper alternative of LPG vs Gasoline.
I'm from Europe, and where benzin/gasoline costs roughly 1,50 euro, LPG just 0,55 euro, which is roughly a saving of 1 euro per liter. My current mileage is at an average of 15 liter per 100km. The installation cost me 1200 euro in the Czech Republic, whereas I currently live in Germany. I have the LPG installation since 95.000km, I'm not at 103.000km, which makes the installation just 8.000km old. I can drive 6,66km or every liter, so dividing 8000 by 6,66 makes 1201,21 euro. In just 1 year and 8.000km, the entire LPG installation has been paid off, and from now on, I run the car for roughly 15 euro per 100km cheaper. I bought the car for 2700 1,5 years ago, with all the maintenance I'd say a total of 3600 until now. 3600 euro multiplied by 6,66km for every liter is 24.000km to save those 3600 euro that the car has costed me ever since I bought it. Before I reach 103+24=127.000km, other maintenance costs will occur, but you get the idea. I doubt it will cost me another 1000 euro until 127.000, so it's safe to assume that by 135.000km, running on LPG has returned the cost of the LPG installation, and I saved enough money to buy myself another engine or easier, another RX-8 if the engine dies.
The advantages of LPG are for example, that the fuel is injected as a gas, versus gasoline as a liquid. So it's pretty impossible to flood an engine on LPG, nor does it wash away the oil film on the rotor housing, nor is the oil contaminated. Carbon deposits are less and the combustion temperature is colder to that of gasoline. Many people argue that LPG burns hotter, which is not true. In normal engines, the valves would overheat because they are not cooled by the injected gasoline, versus to LPG that is basically a "dry" fuel. So flash lube is added to lubricate and cool the valves. My exhaust gas temperatures even dropped by 20 degrees celsius when I drive my car on the highway (it's the only reliable measure).
There is a slight powerloss on LPG, but you can program the LPG ECU so that it switches to 100% gasoline when your press your Accelerator Pedal over 80%, it's really up to you. So you can have the best of both worlds, by injecting 100% gasoline when you require power, and 100% LPG when you require economy during cruising.
If you want to know what installation I'm using, there is currently only 1 on the market that has the "Wankel Mode", so it's easy to find if you are curious. Overall, it's more economical and even healthier for the engine to run on LPG. Yes, I currently have starting issues as you might read my threads, which is related to a dead coil. Mixture isn't ignited and the engine floods itself during starts, and almost instantly starts when I cut off fuel supply. I still have 80k miles old original coils, so it's no wonder. I will order new ones from Hitachi or NGK.
I didn't really make this thread to show off or preach how LPG is superior to gasoline, but to look at the facts. I am willing to admit that I'm wrong based on facts, and I don't expect anything more than a decent discussion about gasoline vs LPG aka "Cooking gas" and how it affects the engine, and so on.
I'm from Europe, and where benzin/gasoline costs roughly 1,50 euro, LPG just 0,55 euro, which is roughly a saving of 1 euro per liter. My current mileage is at an average of 15 liter per 100km. The installation cost me 1200 euro in the Czech Republic, whereas I currently live in Germany. I have the LPG installation since 95.000km, I'm not at 103.000km, which makes the installation just 8.000km old. I can drive 6,66km or every liter, so dividing 8000 by 6,66 makes 1201,21 euro. In just 1 year and 8.000km, the entire LPG installation has been paid off, and from now on, I run the car for roughly 15 euro per 100km cheaper. I bought the car for 2700 1,5 years ago, with all the maintenance I'd say a total of 3600 until now. 3600 euro multiplied by 6,66km for every liter is 24.000km to save those 3600 euro that the car has costed me ever since I bought it. Before I reach 103+24=127.000km, other maintenance costs will occur, but you get the idea. I doubt it will cost me another 1000 euro until 127.000, so it's safe to assume that by 135.000km, running on LPG has returned the cost of the LPG installation, and I saved enough money to buy myself another engine or easier, another RX-8 if the engine dies.
The advantages of LPG are for example, that the fuel is injected as a gas, versus gasoline as a liquid. So it's pretty impossible to flood an engine on LPG, nor does it wash away the oil film on the rotor housing, nor is the oil contaminated. Carbon deposits are less and the combustion temperature is colder to that of gasoline. Many people argue that LPG burns hotter, which is not true. In normal engines, the valves would overheat because they are not cooled by the injected gasoline, versus to LPG that is basically a "dry" fuel. So flash lube is added to lubricate and cool the valves. My exhaust gas temperatures even dropped by 20 degrees celsius when I drive my car on the highway (it's the only reliable measure).
There is a slight powerloss on LPG, but you can program the LPG ECU so that it switches to 100% gasoline when your press your Accelerator Pedal over 80%, it's really up to you. So you can have the best of both worlds, by injecting 100% gasoline when you require power, and 100% LPG when you require economy during cruising.
If you want to know what installation I'm using, there is currently only 1 on the market that has the "Wankel Mode", so it's easy to find if you are curious. Overall, it's more economical and even healthier for the engine to run on LPG. Yes, I currently have starting issues as you might read my threads, which is related to a dead coil. Mixture isn't ignited and the engine floods itself during starts, and almost instantly starts when I cut off fuel supply. I still have 80k miles old original coils, so it's no wonder. I will order new ones from Hitachi or NGK.
I didn't really make this thread to show off or preach how LPG is superior to gasoline, but to look at the facts. I am willing to admit that I'm wrong based on facts, and I don't expect anything more than a decent discussion about gasoline vs LPG aka "Cooking gas" and how it affects the engine, and so on.
RX-8 on LPG, the math.
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