Yes it is very heavily leaded. I once heard it was about 30x the lead of old standard leaded petrol, dunno how true that is. But you can see it, when we used to refuel rally cars you'd have white powder on your hands after the fuel evaporated off. Nice

Thus, it will stuff up your catalytic converter in no time. However that is the only issue so if you have no cat (naughty naughty) then it will be fine.

You won't find much of an improvement as the car can only use about as much ignition advance as will suit normal premium so the extra octane is 'wasted' unless you have more compression or advance the timing even more.

Easy solution is to add toluene as an octane booster. I can't remember the amounts but up to 10% is fine from memory. Google the amount to use - you should be able to find 5% = 3 octane points or something.

Then premium plus about 5L of toluene in your tank will make almost an avgas kinda level and it is not leaded.

I used to buy 20L drums of toluene from the Shell distibutor in Spearwood - can't recall the name - and it was about $30 a drum. So you got twice as much octane increase as the little poxy bottles in the servo, for about half the price.

Let me know how ya go bruz I would love to get another 5-10 ks outta my VW transporter
cheers Boof

Mark _australia said...

Thus, it will stuff up your catalytic converter in no time. However that is the only issue so if you have no cat (naughty naughty) then it will be fine.

Well, sort of fine.
There is so much lead (tetra ethyl lead) in 100/120 avgas that it also claggs up the plugs unless you are flogging the engine mercilessly.
The plugs have to stay quite hot to keep them clear, otherwise they get a hard coating of light brown lead compounds deposited on the electrodes which shorts out the spark.
I used to use it on my bike because bikes are such great things to flog mercilessly and so the plugs rarely leaded up.

In a plane frapping along at 65% throttle setting or more, this is not usually a problem because the plugs run hot enough to burn clean, although it can be if you spend 20 minutes idling around the aprons waiting for clearances.

It's a real problem for the older plane engines which were lower compressions and consequently lower combustion temps. They were not made to use high lead fuels.
The plugs clag up within around 25 hours use and have to be cleaned very regularly.

pay of the house insted!

doggie said...

Ive got a 04 SS 5.7 Commodore 6 speed manual.

Can you run straight avgas in a injected motor? And if you cant what can you use?

When we used to do alot of racing and with older cars you dont have to worry too much about fuel, it was just advance the timing a bit and maybe a jet change but that was rare.

Some sites say it has lead in it and if it has I cant use it in my car.

Any help out there, anyone a fuel specalist?

You will be better off if you forget all that crap and trade it in on a Silver 84 XE Fairmont and you won't have any more of these vexing questions to ask or technical answers to wade through and be happy in the knowlege that you are riding around in a vehicle fit for a King.

Mate, the Dunny Door plus 5G and you have got a deal but that does not include delivery. You'll have to come and get it.

25 G for mine would be more than a little ambitious.

I had to let my very original white 85 XF S Pac, 4.1 auto, rust proofed from day one and totally immaculate for $2,100. Reckon I tore up about $800, but it was either that or tear up more.

The only one that would be worth anything near 25 G would be one of these, but it would have to be red over silver and manual.

www.carsales.com.au/?utm_source=carpoint/all-cars/private/details.aspx?R=9700473&YearFromShort=1632&__Qpb=true&Cr=7&__Ns=pCar_PriceSort_Decimal|0||pCar_RankSort_Int32|1||pCar_Make_String|0||pCar_Model_String|0&keywords=&YearToShort=1663&__N=1216 1247 1252 1282 4294966463 1561 713 1632 1663&silo=1011&__No=45&seot=1&__Nne=15&trecs=54&__sid=1228DD0B46A1

cisco said...

25 G for mine would be more than a little ambitious.

I had to let my very original white 85 XF S Pac, 4.1 auto, rust proofed from day one and totally immaculate for $2,100. Reckon I tore up about $800, but it was either that or tear up more.

The only one that would be worth anything near 25 G would be one of these, but it would have to be red over silver and manual.

www.carsales.com.au/?utm_source=carpoint/all-cars/private/details.aspx?R=9700473&YearFromShort=1632&__Qpb=true&Cr=7&__Ns=pCar_PriceSort_Decimal|0||pCar_RankSort_Int32|1||pCar_Make_String|0||pCar_Model_String|0&keywords=&YearToShort=1663&__N=1216 1247 1252 1282 4294966463 1561 713 1632 1663&silo=1011&__No=45&seot=1&__Nne=15&trecs=54&__sid=1228DD0B46A1

good thing about those falcons is that you could see behind you when reversing! nowdays the designers must always drive forward and never reverse.

hotballs said...

doggie said...

Ive got a 04 SS 5.7 Commodore 6 speed manual.

sorry about that

Why? Its good fun

doggie said...

hotballs said...

doggie said...

Ive got a 04 SS 5.7 Commodore 6 speed manual.

sorry about that

Why? Its good fun

Especially if you do not own it but get a chance to flog it to death.

doggie said...

echunda said...

Why do you want to run Avgas?

Are you thinking of track days?

Yea as well as general performance. Im going to be co driving in a sports sedan next year up at Wanneroo and we will have planty of av gas around. Marks idea of toluene is a good idea as you only need a small percentage to get a result.

My car has no mods yet and I was looking to see what I could get out of it with out mods.

Do you do any track days?

I do, but on 2 wheels. My bike has more than enough power to scare the poo out of me.
If your thinking of track days, tyres and suspension mods will give you better times.

doggie said...
True but its a street car so brakes will be the first mod then springs & shocks, not too low and some headers/extractors and a free flow exaust.

As far as exaust goes I want more flow but not to loud.

You are obviously overpaid, underworked and have absolutely no idea how to invest money wisely.

Either that or so filthy rich it does not matter what you spend money on any more.

There but for the grace of God and my own stupidity, go I.

P.S. BTW, Avgas is meant for aeroplanes with pisstin engines. It will never get a Dunny Door airbourne.
I have seen a few low flying Facons around though.

theDoctor said...



^^^ comment of the month...!

this is a watersport forum, if there is no place for conspiracy nuts, there is no place for dorks who wanna spend stupid amounts of cash on rubbish to go fast in a straight line...

"yo, my car does 11's, she's sick bro"

"really for shizzle, thats sick bro"

"yeah, sick bro"

"yeah, sick"

"yeah bro"

"check the sub woofer bro, she's sick bro"

"yeah, bro sick"

"yeah bro"

"yeah sick, watch how I look like a total dick at traffic lights with my loud exhaust and totally sick annoying subwoofer cranked all the way up"

"what did you say bro"

"what bro"

"what did you say bro"

"I can't hear you bro, my subwoofer is totally fully too sick to hear you bro, lets just drive around for the next few hours totally not talking to each other, just each being secretly nauseated by the doof doof of the fully sick and sickening distortion of the fully sick subwoofer bro"

"maybe we can pick up chicks who dropped out of highschool at fourteen and have zero aspirations for their future bro, and they won't care we have small members cause our subwoofers are fully sick and we can run 11's bro... 11's..."

MMMmmmm, complete idiot.

fuel change is a bad idea.

plane and simple.

your LS1 computer is able to be re-mapped really eaily (refer to LS1 edit) not that i condone doing it yourself.

bolt on a set of Tri-Y extractors, optional high flow cats, 2 1/2 " cat back exhaust

get the intake changed to an OTR, get a mild cam (because you sound like your willing to blow money) and a re-map

hello 300+ kw at the rears

put on some descent slotted disks and get some reasonable pads.

stiffer springs and chuck in some pedders reds.

braided brake lines and a power steering cooler.

ready to rock :D

theDoctor said...



^^^ comment of the month...!

this is a watersport forum, if there is no place for conspiracy nuts, there is no place for dorks who wanna spend stupid amounts of cash on rubbish to go fast in a straight line...

"yo, my car does 11's, she's sick bro"

"really for shizzle, thats sick bro"

"yeah, sick bro"

"yeah, sick"

"yeah bro"

"check the sub woofer bro, she's sick bro"

"yeah, bro sick"

"yeah bro"

"yeah sick, watch how I look like a total dick at traffic lights with my loud exhaust and totally sick annoying subwoofer cranked all the way up"

"what did you say bro"

"what bro"

"what did you say bro"

"I can't hear you bro, my subwoofer is totally fully too sick to hear you bro, lets just drive around for the next few hours totally not talking to each other, just each being secretly nauseated by the doof doof of the fully sick and sickening distortion of the fully sick subwoofer bro"

"maybe we can pick up chicks who dropped out of highschool at fourteen and have zero aspirations for their future bro, and they won't care we have small members cause our subwoofers are fully sick and we can run 11's bro... 11's..."

was that some poor arsed attempt at being funny . ****ing retard

cisco said...

doggie said...
True but its a street car so brakes will be the first mod then springs & shocks, not too low and some headers/extractors and a free flow exaust.

As far as exaust goes I want more flow but not to loud.

You are obviously overpaid, underworked and have absolutely no idea how to invest money wisely.

Either that or so filthy rich it does not matter what you spend money on any more.

There but for the grace of God and my own stupidity, go I.

P.S. BTW, Avgas is meant for aeroplanes with pisstin engines. It will never get a Dunny Door airbourne.
I have seen a few low flying Facons around though.

Last line hilarity aside, at the end of the day it's horses for courses. If someone gets more enjoyment of out life by doing up there car so be it. You might get enjoyment out of investing in the share market, property etc and watching your investments grow...or tank. You only live once, may as well have some fun, beats sitting around on milk crates and eating cereal because you are 'investing in your future'. Once you get there you'll might realise your best days are behind you Note this comment is not specifically aimed at you, more people who employ that philosophy.