Octane Booster

[JimX]

I don't think there is anything other than a 1/4 tank of toulene or the like that will boost your 98RON fuel to 100 or more.

The way mixed fuels get their octane rating is (basically, not precisely) by averaging out the RON rating of each component. If you have 60L of 98RON fuel, you'd need 500ml of something with a RON approaching 300 in order to boost it to 100RON. Does such a substance even exist? Toulene already has quite a high octane rating, and yet you need a 1/4 of a tank of it to make any significant gains.

Whenever fuel companies talk about their product boosting fuel by a number of octane "points", they are referring to the number after the decimal point, not before. So something boosting your fuel by 7 points is less than +1 RON.

[T0nyGTSt]

A 1/4 toluene is even more than I'd like... 1/10 to 1/5 is enough on 98. Should pump you over 100.

T.

[JimX]

Well, 1/4 is just a number I pulled out of my arse So was 500ml.

[strutto]

Originally posted by red900ss

Now someone please correct me if I'm wrong:

The knock sensor is also called a lambda sensor and measures the unburnt oxygen via the oxygen sensor, right? If the system is a closed loop system then it can adjust the timing to suit the fuel used.

The RB25DET (stock ECU) does not have this as you have to tune it for the fuel being used , right?

Any corrections appreciated.

A knock sensor is not the same as lambda sensor... A lambda sensor usually refers to a wideband O2 sensor...

O2 sensors measure the amount of unburnt oxygen in the exhuast.

Knock sensors "hear" detonation and are usually screwed to the engine block...

The RB25DET has two knock sensors on the inlet side of the block... And it will retard the timing and up the fuel if it senses detonation...

I think