"Octane Boosters" for VQ37 Motor

RoshDawg

You can buy toluene at Sherwin Williams (114 octane) 5 gallons for $35. Much cheaper if you buy a 55 gallon drum (that's a lot!). You only need a touch over 2 gallons with 16 gallons of 91 octane to bring up total octane to 94. But some say you need to use additional lubricants to protect interior surfaces of the fuel tank and lines.

Oh and toluene is often used to bring up bad oil to 87/89/91 octane levels.

__________________
| EVO X MR | '11 WRX STI | 370Z SPRT | 911 (991) C2S |

DEpointfive0

... Toluene is 103 AKI. AKI, is what the US standard is for gas. (What you see on the pump)

So using that info, your calculation is a bit off...
And in CA you can't buy Toluene actually (just saw the OP is in CA)

I used to use Toluene a LOT back in the day, so I've done all the calculations and figures... I HAD an excel sheet too, but I recently deleted it because it's just not worth the cost...



And about the need to add lubricants, you don't need to add any if you use Toluene, but you'd need to use something like Marvel Mystery Oil if you used Xylene

__________________
Do YOU want to know what/where I got my username from?

RoshDawg

Ohh crap sorry. I was mixing up RON with AKI

__________________
| EVO X MR | '11 WRX STI | 370Z SPRT | 911 (991) C2S |

alcheng

Engine are design and tuned for certain spec/octane-value. For a normal OEM spec engine you won't get any difference between 91 or 94 since they are tuned for 91.

If you put 89 or 87, that you will lose hp and fuel-economy, and it give stinky exhaust.

I tried 87, 89, 91 and 94 before, not with the Z but my previous cars.

And I am sticking with 91 since I see no difference on performance and fuel-economy between 91 and 94.


You found yourself the answer

Now you can save those money and buy yourself a beer <== a liquid that your money well spent on

DEpointfive0

[QUOTE=alcheng;2172986]Engine are design and tuned for certain spec/octane-value. For a normal OEM spec engine you won't get any difference between 91 or 94 since they are tuned for 91./QUOTE]

I disagree with this point.
The car will advance timing, and adjust per current conditions... (Like anything else, intakes, exhausts etc.)

__________________
Do YOU want to know what/where I got my username from?

alcheng

Unless you tuned it and it requires 94, otherwise if the drivers manual says 91, 91 is as good as 94.


I tried both on the same car... no difference...