boost

[impulsed_sv6]

hey guy im going to the local drag stip on wednesday and want to get the best possible time i can and jsut wondering if i put octane boost in my tank will it affect my engine in anyway cuz i am un aware if it will or not

[davidson.nick]

i put it in mine every 3 weeks or so and it works fine, goes abit harder as well...

[azazeldeath]

I have used the pro boost in mine countless times. All it really seems to do is make it idle smoother and seems to make the fuel go down faster.

[impulsesv6]

nope no difference...

the uk show 5th gear did a test = YouTube - 5th Gear - Myth about fuel additives

[vr1uz-fe]

the 98 octane allready has additives in it it is all you need

[abg]

If you're after higher octane than whats commercially avaliable from a pump you'd be better off getting a hold of a drum of ethanol or toluene and tuning to suit. They both have octane ratings in the 110 range.

[bigdaddycool]

It may decrease your time....... as your car may knock due to the octane boost if it's not tuned to run it. Run what fuel your cars been tuned for.

[Dz811]

It may decrease your time....... as your car may knock due to the octane boost if it's not tuned to run it. Run what fuel your cars been tuned for.

correct... and incorrect...

your car won't knock if you increase the octane, but it can if you DECREASE it (not that you would anyways).

but correct that it won't do anything for you. Most tests show a decrease in power unless you specifically tune your car for the higher octane rating. Mainly because the chemicals ever so slightly (like half a percent) reduce the combustion energy in exchange for a much cleaner faster burn (which is what the octane rating represents).

and before everyone goes correcting me, ok i might not know the exact terms etc used, but that's the basic gist of it

[abg]

I'm really sorry to interject here, and I'm not in anyway having a go at you, I just want to help the community learn. Your pretty spot on but I'd just like to add a few more points:
The octane rating is directly related to how hard it is to ignite the fuel, the higher the number, the harder it is to start it burning. A higher octane fuel is less likely to spontaneous ignite in an uncontrolled manner on it's own, in other words it's less likely to knock. Octane dosen't relate to energy content, a litre of 91 and a litre of 98 will release almost exactly the same amount of energy when burnt. Octane rating is related to how fast a fuel burns, the higher the rating the slower the burn. This is why you need to advance the ignition timing with higher octane to get more power. Peak torque is made when the combustion chamber pressure reaches it's maximum level at a specific non changing point in the pistons downstroke (from memory it's around 20-30 dgrees ATDC but I could be way off there). In order to get the pressure peak at this same sweet spot in the pistons cycle with a slower burning fuel (i.e. higher octane fuel) the burn must be started earlier (i.e. the ignition must be advanced). If the ignition timing isn't advanced and everything else is left the same then some energy is lost as the pressure peak occurs too late in the cycle.

I'm really sorry to nerd it up here, and again absolutely nothing personal is intended, I just think it helps everyone understand why things happen the way they do when they know some of the background principles.

[Dz811]

I'm really sorry to interject here, and I'm not in anyway having a go at you, I just want to help the community learn. Your pretty spot on but I'd just like to add a few more points:
The octane rating is directly related to how hard it is to ignite the fuel, the higher the number, the harder it is to start it burning. A higher octane fuel is less likely to spontaneous ignite in an uncontrolled manner on it's own, in other words it's less likely to knock. Octane dosen't relate to energy content, a litre of 91 and a litre of 98 will release almost exactly the same amount of energy when burnt. Octane rating is related to how fast a fuel burns, the higher the rating the slower the burn. This is why you need to advance the ignition timing with higher octane to get more power. Peak torque is made when the combustion chamber pressure reaches it's maximum level at a specific non changing point in the pistons downstroke (from memory it's around 20-30 dgrees ATDC but I could be way off there). In order to get the pressure peak at this same sweet spot in the pistons cycle with a slower burning fuel (i.e. higher octane fuel) the burn must be started earlier (i.e. the ignition must be advanced). If the ignition timing isn't advanced and everything else is left the same then some energy is lost as the pressure peak occurs too late in the cycle.

I'm really sorry to nerd it up here, and again absolutely nothing personal is intended, I just think it helps everyone understand why things happen the way they do when they know some of the background principles.

that's what i meant :P haha thanks man