Jump to content
SAU Community

Recommended Posts

this came to me from somebody in the fuel industry(no names or brands)

"What`s the benefit of higher octane?

Higher octane fuel has only one beneficial feature- it allows an engine to run at higher temperatures with more advanced ignition timing under higher levels of compression without detonating/knocking. higher octane fuel does NOT have more potential energy and will not make an engine perform better unless that engine is knocking. on modern engines with knock sensors, higher octane fuel may make the engine run better if the knock sensors are retarding the ignition timing, which hinders performance. high octane fuel does not burn cleaner, it does not clean your engine. it does not increase horsepower or torque(unless your engine is knocking), it does not smell better, it does not increase fuel economy(unless knocking)and it is not better for the environment. "

Link to comment
https://www.sau.com.au/forums/topic/35596-food-for-thought-octane/
Share on other sites

Don't some of the fuel co's use additives to the high octane fuel that "clean" the engine?

(Whatever that means!??!?!)

Not neccessarily to do with the RON/MON of the fuel... i.e. the fuel would be 98RON with or without it but they ONLY put the additives in on this premium fuel...

Adrian

yeah i was thinkig about that, the reason i posted was because of the money i wasted on octane booster, imean car car shot flames out the back of it but when i dynoed it one day and got less then normal i started looking at fuel maps and boost settings and everything except my fuel.

fuel co`s recomend to use the premium fuel in cars because it cleans out your motor but don`t by it because it will give you more power. who has dynoed there car to see a diff in premium and 95?? it is easy to show a 15KLW gain on the side of a bottle, but there are to many varibles to justify that gain. ,, wheather, temp, where the tests were done, or even which test was done first. these all come into play when you read off a dyno.

What sort of octane booster were you using? Some are pretty much useless...

I had one which actually does bump it up a few points (and actually claimed to guarantee that), but it was $20 or so for a little bottle that would do maybe 1/2 -> 1 tank. The others I looked at were very vague "gives increased performance, blah, blah" but no actually RON increase so was suspicious.

You're best off with avgas or toulene or the like though if you're serious.

To be honest, I switch readily between 95RON and 98RON depending on availability and what service station i turn up at, but notice no discernable difference to my cars smoothness or power.

i paid $20 for a bigger bottle i think it did 2-3 tanks

maybe the one u used increased the power another way. i would have no idea how but after doing some research on this i can`t see how octane could increase power.

The best octane booster for our usage is Toluene. There have been several threads on this. Add approx 5% to bring octane rating up just over 100. You qote reasons why it gives more power in your first post, if you reread it carefully. It will ONLY benefit if you tune the motor up to the new octane rating

Haven't tried it with the line but with my 99 SSS there's no way you could say either that it was lacking power on normal fuel (ie pulled timing) or that it didn't gain it from using high octane stuff.

Don't ask for technical explanations (or a dyno reading) but that's what I think.

The best octane booster for our usage is Toluene. There have been several threads on this. Add approx 5% to bring octane rating up just over 100. You qote reasons why it gives more power in your first post, if you reread it carefully.     It will ONLY benefit if you tune the motor up to the new octane rating

Can you just add the toulene to your regular fuel? it doesn't do any damage to seals or anything like that???

hi guys,

Believe it or not lower octane fuel is more voliatile than the higher octane. So using lower grade increases the chance you will get detonation before tdc and hence loose power, not convinced the octane booster's work but over here we always put 98 ron in when we can!!!!!

hi guys,

Believe it or not lower octane fuel is more voliatile than the higher octane. So using lower grade increases the chance you will get detonation before tdc and hence loose power, not convinced  the octane booster's work but over here we always put 98 ron in when we can!!!!!

That's the point we're making though? nobody wants knock, we want to be able to advance the timing a bit and run more boost without worrying about putting a hole in the top of a piston... i agree though, that the best thing is to just run the best fuel you can find and then maybe throw some booster into that, rather than running 95 octane and a ball of booster to try compensate.

What about methanol? what's the difference between using toluene and methanol?

I used (tolune) 10litres to a full tank. Not sure what that works out too but gave me an extra 70rwhp. With just normal bottle octane booster from Hardcore Racing gained 30+rwhp
Although your car isn't anywhere near 'stock' right?

WHen I first bought my 32 I wasnt aware of the difference between premium (95) & ultimate (98). I slapped it on the dyno and made 115rwkw. I was running 95 Premium.

I wasn't able to run any ignition advance to make more power as it was ever so slightly pinging. Slapped the 98 in advanced timing. Made a huge difference.

Guest INASNT

There was an octane booster test in last issue of zoom, and the most gain they got was around 6kw@wheels with 3 degrees extra timing.

If u want high octane run on some suncorp 104 which is about $4 a litre or go hardcore and run some C16. If u run C16 u will need to change plugs and o2 sensor frequently coz it burns them out

As mentioned by others, higher octane will allow you to tune "harder" and that is where the extra power comes from.

On the question of methanol, DO NOT try to run it on something that hasn't been tuned for it ESPECIALLY a turbo car, as the stoichiometric AIR:FUEL ratio for methanol is approximately 6.5:1 compared to approx 14.7:1 for pump fuel, which is why they run massive injectors and 5:1 AFRs.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...