Is it okay to shift at high rpms on a 2007 honda civic si?

You can change up gear at any level of rpms, until it gets to the redline on the gauge. Shifting down you need to be a bit more careful as the rpms will go up when the gear change goes down

You take a chance when you shift gears that high but no, it's not a big issue as no immediate damage will result from this. Long term damage, this depends on how hard you continually drive. As for what the gears are for, your top gears are for highway/cruising speeds, the lower gears are for getting the damn thing moving... :-)

Its ok its not great but ok your car should have a rev limiter to prevent any major over revs.. Your car has the most horsepower 197HP at 7800 RPM and the most torque 139 ft/lbs at 6100 RPM, if the car is stock. Daily driving keep it around 3000.. If you wanna race hold the gears longer 1,2,3 are your get up and go gears in your car you may engage 4 at higher speeds or longer stretches.. You are to new to racing to be doing this any street racing is dangerous not only to you but also other drivers. Yeah its fun trust me Ive done well over 80 in a 35 and 130 on the freeway in the Impreza but it was dumb I was lucky a tire didnt blow or a car pulled out in front of me.

An occasional higher shift point is OK, but I wouldn't make a habit of it. 8000 RPM is putting a LOT of stress on the crank and rod bearings. I kinda doubt a Civic COULD rev to 8K, but anything over 5K is wasted gas and basically pointless......

More rpms does not mean more gas, a simple proof, go on an uphill, shift to top gear and release gas pedal, your rpms are going to increase while your gas dont, because theres no enough load. Shifting are redline does NOT always provide best acceleration because power starts to drop at higher or close to redline, if you want to learn and find the best shifting points, you can use a car performance simulator, try at http://www.nxgtrsim.com

If you car's redline is 8000 RPM, you can shift at any RPM level below that limit (without stalling the engine, of course). The engine in the 2007 Civic Si generates maximum power at 7800 RPM, which means that if you're shifting from 2nd to 3rd at 5500-6000, you could still shift later and use even more engine power. Bottom Line: Keep shifting at high RPMs to get your car up to speed faster. USE THE RIGHT OIL: In all of my previous Hondas, I've used full synthetic racing motor oil to help combat any additional engine that might be caused by shifting at high RPMs (Racing = High RPMS). I'd recommend Amsoil series-2000 0W-30 for your car. http://www.amsoil.com/catalog.aspx?code=AZOQT-EA With this oil, you only have to change the oil and filter every 35,000 miles or once a year (whichever comes first) If you can't buy Amsoil, Mobile-1 fully synthetic is a suitable replacement and should also have extended oil-change intervals similar to Amsoil: http://www.mobiloil.com/USA-English/MotorOil/Oils/Mobil_1_Extended_Performance_5W-30.aspx

Exceptionally, it may be ok, provided you clutch correctly. Adopt a calmer driving style, your passengers, car and wallet will appreciate! No such things as "power" or "other" gears - they are adequately scaled and each has its purpose and use. With time you will learn to recognize the right engine purr and change gears accordingly.

It's more than okay, it's good for the engine. No, seriously, it is. Each engine has an optimum operating range. When driving for fuel economy in my mustang, (V8, 300+hp, 5 speed), I shift at around 2000rpm. In your Civic, however, which has basically nothing for torque, you will need to rev it higher, so for normal driving 2500-3000 is probably about right. If you just need to get going a little quicker, 5-6000 is fine, if you really need to get the car moving for all it's worth, shift at 7999rpm. As for what I said, it's good to redline the engine every now and then. The reason is, carbon builds up in the combustion chamber when you lug the engine around at low speeds, and this affects airflow into and out of the engine, compression, and power. When you rev the engine high, more air and fuel is being burned at higher pressure and temperatures, which helps to burn that carbon buildup off valves and such.