What is back pressure in engine? Why does Engine needs back pressure?
Backpressure refers to pressure opposed to the desired flow of gases in confined places such as a pipe. It is often caused by obstructions or tight bends in a confined space such as an exhaust pipe.Engines do not need backpressure . It is in fact completely inaccurate and a wholly misguided notion.The classic symptoms of too much backpressure include things like a lack of high speed power, poor fuel economy and even overheating. Anything that backs up exhaust pressure into the engine will also back up heat. About a third of the heat produced by combustion goes out the tailpipe as waste heat, so if the heat can't escape it can overload the cooling system and make the engine run hotter than normal, especially at highway speeds.If there is a complete blockage in the exhaust, the engine may start and idle fine for a minute or two, then die as backpressure builds up and strangles the engine. In some instances, backpressure may buildup to such a degree that it blow out a pipe connector or the converter shell.Reducing exhaust backpressure can improve fuel economy and performance. Reducing restrictions in the exhaust system allows the exhaust to flow more easily so the engine can breathe more efficiently. The most common modification is to replace the stock muffler with a low restriction aftermarket performance muffler, or to replace the entire stock exhaust system from the catalytic converter back with a free-flowing aftermarket performance exhaust. So u must focus on keeping your back pressure as low as possible and not try to increase it.
Why are all supras so fast?
Because the engine is built to handle around 1000HP and some come stock with twin-turbos. You can upgrade the car easily, and because the engine was made to handle the power, you really don't have to limit yourself that much. Other cars with engines that are made for extreme HP include the Nissan Skyline GTR and the Mitsubishi Lancer Evolution. You can find these are well with over 500HP outperforming many supercars. (The Lancer Evo IX 400FQ is about as quick as a Lamborgini Gallarado stock)
What causes a gas pedal to be hard to push?
Here's a different take, if its always been that way then leave it, I've operated various equipment that had really light return springs. It was very annoying and exasperating trying to hold a steady throttle when every little bump had you moving the pedal and inch or more!! It was easier to just floor it and leave the equipment in a lower gear than try to hold part throttle.If it wasn't always heavy then there's binding somewhere, wd40 is not a lubricant btw, use something with Teflon on all the pivot points. If it's a cable then I use a cable luber like this oneMotion Pro 08-0182 Cable Luber Amazon.com: Motion Pro 08-0182 Cable Luber: AutomotiveIt's a little messy and I mostly use it to lube motorcycle cables but it does get the lube throughout the whole cable.
Mitsubishi 3000GT, worth to have?
no wait till it needs a timing belt at 60 thousand miles u will wish you never heard of the vehicle and if it brake u will need about $2,000 to repair the 24 bent valves it a valve to piston interference motor ,so on the other hand it cheep on gas but ,it will brake even to a V-12 when the repairs come In, and u really need to know how to install a timing belt it has three one counter weight belt and a intermediary belt and a main timing belt and need very special tools to change them, and a lot of car experience , call the dealer and ask them how much to change all the timing related belts it will be or cost more that the car is worth, Buy a Ford Shelby Cobra GT-500 better car and 100 times the performance and cost less to fix and looks better that the car built by the people that bombed Perl Harbor
How does a high RPM affect the engine?
First thing that happens in higher rpm is your engine oil reaching higher temperatures than normal. When they are in contact with the cylinder side walls they move up and reach out the piston rings. Prolonged exposure of very high temperatures would eventually affect your piston rings and they lack sealing the combustion pressure.Second thing is your camshafts. They are more strained than normal and can even break the heads of your intake and exhaust valves.In case if it is a turbocharged, very high rpm would defiantly raise the inlet air temperature which might lead to early ignition inside the cylinders (if inter-coolers are not present) and might severely damage the engine.So considering all factors you can rev up to 75- 80% of your rev counter's maximum limit.