RPM is how fast the crankshaft spins. Let’s say at 800 rpms (~idle), how many times a minute is a spark plug sparking?
Does anybody sell Drum brake covers? I can’t seem to find new ones online. Mine are rusty, and I would like to get new ones to paint.
I’m thinking about lowering springs, but I do go camping, and the car is loaded down with gear. Are lowering springs more "resilient" than OEM springs, and can hold a higher weight limit?
Hard to notice a difference in acceleration - unless you have a stopwatch. The butt dyno is too subjective.
Number of spark events - depends on the ignition design. Some cars have a "waste spark" ignition system (one coil pack for two cylinders) - others are direct coil on plug setups. In any case, it takes two complete revolutions of the crankshaft to cycle through all 4-strokes of an otto cycle (intake, compression, power, and exhaust) for a given cylinder. Given a 800rpm idle, you will have a single plug fire a minimum of 400 times during that minute.
Drum brake covers?? Not sure what you are after here - do you mean just new drum brakes to paint? Should be available at autoparts stores and at the dealership. You can always wirebrush the set you have, clean and repaint yourself.
I was planning to clean mine up as well - the OEM paint is starting bubble up, so I'm going to brush them down and repaint flat/satin black just like OEM.
As for the springs - you are correct - I've found that I can add "more" weight to the rear with my TRD lower springs than with OEM springs. Good lowering springs generally have a greater spring rate - so they will see less spring compression compared to OEM springs. I wouldn't call them heavy duty springs - but I know that on my car, I couldn't load two full coolers in the trunk without bottoming my suspension on OEM springs on even slight bumps. With TRD springs (~1-1.5" drop) - I can carry those same coolers, no problems at all.
195/50/15s are way too small for an 8th gen Corolla, your speedometer will actually be off by 3.4% (too fast), At 60mph, you'll actually only be doing 58. Not really the best choice.
Tire sizes you should be looking at are 195/55/15 or 205/50/15, but the latter might require you to roll your fenders.
Automotive engineering theory says that light wheels reduce unsprung mass, which is beneficial for acceleration. However, an increase in the diameter size of the wheels will increase the rotational mass, thereby having a negative impact on acceleration. This will work out to be about the same as stock. It all comes down to the weight of the tires that you choose.
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Originally Posted by TURBO Das Automagazin
A BRZ, a curvy mountain road makes one liter of happiness hormones.
When you take off a rear wheel. I have a very rusty "bowl" that covers the brake drums.
If you look at this picture, I am looking for the part that covers this. Is that part of the braking mechanism that I am looking for?
Mine look so rusty, that It may have rusted all the way though. (or is this highly unlikely?)
One thing that I love about the rolla, is the responive handling. The car feels very snappy, and the sway abrs I have on make it feel solid. Would I notice a difference with a wide tire such as 195/55 or even 205/50? Or would the extra 10 - 20 mm not be noticeable.
thats the brake drum itself, i've never seen one rusted through. you'd need to be applying highly corrosive chemicals to the cast iron to corrode it through, its man mm's thick and weighs a good 3lbs each.
Drums almost never completely rust through - at least I haven't seen one do that without the owner trying on purpose. Like Bitter mentioned - there is a lot of metal on those drum brakes. Could be just surface rust that you are seeing, coupled with some flaked off paint - makes it look a lot worse than usual.
Don't think in terms of acceleration - like PhatRoyale mentioned, reducing unsprung mass is a benefit all around. Increasing the diameter of the wheel will shift the inertia of the tire and wheel - if this will have a negative impact on performance, probably unlikely.
I'm running a 195/60-14 tire in place of the OEM 185/65-14 tire. I don't notice anything unusual with steering heft or feedback. Even running 205/45-16 compared to the OEM size - wasn't really noticeable at speed. An extra 10-20mm, you may feel it under braking, cornering - but shouldn't hamper overall handling. Sometimes steering "reaction" feels slower, since you are trying to turn a wider contact area - so smaller, quick steering transitions may feel heavy. But if it gets too bad, a strut tower brace can help sharpen overall steering. Couple with upgrade swaps and bushings - steering should be largely unaffected.
Like many others running 15's, I'm running with 195/55/15. I personally haven't notice too much of a difference in the negative. Also have the TRD strut bar
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Wheel/tire and other questions.
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