I was refering to the 3 series seen in the reflection of your car! haha

Sorry I know it's random but I'm bored at work.

 

Sank you for clarification.

 

So I've been doing a lot of reading and my eyes are starting to hurt. I noticed that I am fortunate to have 94 octane available at almost every gas station here in Toronto as opposed to other members from other locations who only can get 91 octane.

Intially I thought higher octane = more power. After reading what higher octane actually is, it seems 94 might be overkill for my untuned '04 G35 Sedan and might actually be reducing power as it is harder to ignite and slower burning than the recommended 91 octane for the car.

So my question would be, is my theory correct and could I actually be losing power using the higher 94 octane??

Also if I got an Osirus tune, does that also change the compression ratio and can make better use of the 94 octane??

Thank you in advance to who ever answers this question clearly and in great detail.

 

Compression ratio is completely mechanical and has to do with the design of the engine itself.
The only way to increase compression is to tear down the engine and replace major components

 

I was about to answer the same way.
Technically you can change the compression ratio by just replacing the heads.

 

I run 87, its the coupes that require 91

 

I know we all love high quality parts but is it really a bad idea to buy headlights off of ebay?
http://www.ebay.com/itm/INFINITI-G35...a7d6fb&vxp=mtr

They come with a 1 year warranty so why not try them?

 

While you are correct that compression ratio is a mechanical value it's not the only determining factor in actual compression. Two engines with the same compression can have different cylinder pressure readings, which in reality in a more precise measurement of compression. By changing the lobe spacing and valve overlap the camshafts affect compression, since the VQ uses electronically controlled cam phasing a tuner can effectively change the compression ratio.
The other thing to consider is timing, higher octane fuels allow for more timing without detonation, again this is a computer controlled function, you have no idea when the computer pulls timing but when it does it reduces power output. A lightly modified VQ with a stock tune will detonate, when we dyno’d my car it actually went into the high detonation map the first pull we made over 5000 rpm, with 91 octane fuel.

 

Looking for an aftermarket mid pipe for my car. 04 G35x. Can anyone point me in the right direction?

 

I have a question about my alarm, and there are hundreds of alarm threads on this forum but I can't find the answer.

When I press the arm button on my fob, the horn honks once, and the alarm is set. When I press the unlock button on my fob, the driver door unlocks, and if I press again the rest of the doors unlock.

However, when I press the button under the door handle to arm the alarm, it chirps twice to arm. When I press it to disarm, it chirps once, and unlocks that door, and if I press again it chirps again, and unlocks all doors.

Why does fob = horn and buttons = chirps?!?

 

Maybe because you're closer when you're pressing the door button so it doesn't need to be as loud as when you use the remote (possibly assuming you're walking away from the car)

 

Nope, they're both of equal volume to my ears. And why would there be no audible indication with the fob, but there's the beep when I press the button on the car?

 

Will I need to drain my oil on my 04 g35 sedan when replacing the crankshaft and camshaft sensor?:confused2 confused2confused2confused2confused2conf used2:

 

I've never done the job on these cars, but its been my experience that you don't need to.

 

I'm pretty sure both coupe and sedan have the exact same engine with the exact same compression ratio which in turn means both cars require the exact same fuel.

Thanks buddy, you have answered me with a great deal of information yet again. Now to just clear things up even further, so 94 octane fuel is too high of an octane and may actually reduce power to my untuned '04 G35??

Also the Osirus tune CAN increase compression ratio because our engines have electronically controlled cam phasing meaning my car can be tuned to run the 94 octane??

Thanks again