Nissan 370Z Forum - View Single Post

Cjanik · 06-02-2009, 06:50 PM

You guys seem to think im saying that 87 octane will do just as well as 91. I did not say that, However, the post above my last post stated that he'd (she'd?) bump their octane up as much as possible to get more and more HP.

most of you must have skipped my original post, I did not state 89 is just as good as 91. I know the difference, I may only have 14 posts here, but I'm not an idiot. And 89 is perfectly fine to use, as long as you dont floor it.

The compression on the 370z's engine is 11:1, having 110 octane is not going to give you more power over 95 octane, the engine is still only compressing the gas to a 11:1 ratio.

The only thing higher octane will do is allow you to compress it to a higher ratio and avoid knocking. as I stated in my last post, octane does NOT = hp gains. other factors = hp gains, not octane, It just allows those other factors to take place safely.

-edit, forgot to mention about that Z with the HP claims for having higher octane.
The race gas from XXX Racing Fuel is highly oxygenated, and that is most likely the cause for the gains. We all know that if you could compress more air into the cylinders, then you get a bigger bang - and thats how the race fuel from XXX Racing Fuel works. Regular gas typically has a oxygen weight of 2% while the XXX Racing Fuel 138 octane claims to contain nearly 20%!

06-02-2009, 06:50 PM	#28 (permalink)
Cjanik Track Member Join Date: May 2009 Location: Las Vegas Posts: 578 Drives: N/A Rep Power: 17	You guys seem to think im saying that 87 octane will do just as well as 91. I did not say that, However, the post above my last post stated that he'd (she'd?) bump their octane up as much as possible to get more and more HP. most of you must have skipped my original post, I did not state 89 is just as good as 91. I know the difference, I may only have 14 posts here, but I'm not an idiot. And 89 is perfectly fine to use, as long as you dont floor it. The compression on the 370z's engine is 11:1, having 110 octane is not going to give you more power over 95 octane, the engine is still only compressing the gas to a 11:1 ratio. The only thing higher octane will do is allow you to compress it to a higher ratio and avoid knocking. as I stated in my last post, octane does NOT = hp gains. other factors = hp gains, not octane, It just allows those other factors to take place safely. -edit, forgot to mention about that Z with the HP claims for having higher octane. The race gas from XXX Racing Fuel is highly oxygenated, and that is most likely the cause for the gains. We all know that if you could compress more air into the cylinders, then you get a bigger bang - and thats how the race fuel from XXX Racing Fuel works. Regular gas typically has a oxygen weight of 2% while the XXX Racing Fuel 138 octane claims to contain nearly 20%! Last edited by Cjanik; 06-02-2009 at 07:06 PM.