[SuziBlu]

steak_knife wrote:

abclarke wrote:

Working in an oil refinery and talking to the lab tech about the differences in the fuels i cant justify paying the extra amount. They put it down to peoples brains playing tricks on them and the actual gain being next to not noticable

IF you have a stock standard car, drive like you have Miss Daisy in the back, pay bugger all attention to anything concerning your vehicle, well, yes, this is probably right, but, if on the other hand, you have any tuning skills, have ears that work, can use the seat of your pants for performance gains, and are able to do very simple maths, the 98 is the way to go.

Whoever told you this was either playing you for a sucker, or is a complete and utter moron.

[Teracis]

SierraDan wrote:

98 gives me turbo flutter when I back off the revs..

??? As in the burble burble burble like it's a way bigger engine? Mine does that when I change down but I have a feeling it's more the exhaust than anything else.

[SierraDan]

Nah, an oncoming xr6 turbo backed off the same time as I did and I tripped out till I saw it.

[JrZook]

zook95 wrote:

i dont know it only pings when backing down gears with high revs

Errr WTF? You sure its pinging?

[SuziBlu]

JrZook wrote:

zook95 wrote:

i dont know it only pings when backing down gears with high revs

Errr WTF? You sure its pinging?

Missed this one. Pinging when backing down thru the gears ay, that is a bit of a contradiction in terms.

Pinging only occurs upon heavy acceleration, fuel is exploding not burning, fuel is to fast a burn rate (low octane) or timing is advanced to far.

Slower burn rate fuel, (high octane) or back off the timing.

[brodie03]

I am sorry to ask such a noob question, but the "pinging" noise you are referring to, is it like a kind of whooshing sound? That is the only way I can think to describe the sound I hear while accelerating.

[Fatzook]

brodie03 wrote:

I am sorry to ask such a noob question, but the "pinging" noise you are referring to, is it like a kind of whooshing sound? That is the only way I can think to describe the sound I hear while accelerating.

It sounds like there are dozens of little people in your motor furiously beating the piston bores with tiny hammers.

[SuziBlu]

Whooshing, sounds to me like your hearing induction noise, from the carby.

Pinging is more like a "tink" sed in a mickey mouse voice, hit two hammers together softly type tink.

[brodie03]

Ok, thank you very much for the replies. I just had my car serviced and was told to run it on 95 (previously been on 91) and was wondering whether still running it on 91 was resulting in the dreaded pinging noise.

[SuziBlu]

The higher octane is the cheaper fuel.

Sounds wrong I know, but you will travel further on the higher octane liter for liter, also, you will notice an improved response.

IF you do decide to run better fuel, run the old useless fuel out as far as you dare, this way when you fuel up there will be less dilution of the good fuel.

[Fatzook]

SuziBlu wrote:

The higher octane is the cheaper fuel.

Sounds wrong I know, but you will travel further on the higher octane liter for liter, also, you will notice an improved response.

IF you do decide to run better fuel, run the old useless fuel out as far as you dare, this way when you fuel up there will be less dilution of the good fuel.

I don't get better mileage, or more power. Infact the only car I have ever owned that saw any advantage was my 300ZX. But it was a jap import and already tuned for higher octane fuels than the rubbish we get over here.

The thing I like about the higher octane fuels is that I can't hear my motor melting from the inside on a hot day

[Ben_Sierra]

Fatzook wrote:

SuziBlu wrote:

The higher octane is the cheaper fuel.

Sounds wrong I know, but you will travel further on the higher octane liter for liter, also, you will notice an improved response.

IF you do decide to run better fuel, run the old useless fuel out as far as you dare, this way when you fuel up there will be less dilution of the good fuel.

I don't get better mileage, or more power. Infact the only car I have ever owned that saw any advantage was my 300ZX. But it was a jap import and already tuned for higher octane fuels than the rubbish we get over here.

The thing I like about the higher octane fuels is that I can't hear my motor melting from the inside on a hot day

My Sierra, and my old Vitara both pinged with 91RON fuel...

I haven't even bothered to try 91RON in the Swift Sport....

[shep]

i dunno what octane opal fuel is but i had to retard the ignition to 6deg btdc
but it still has plenty of power.
it easily tows my boat at 80kph (4th gear)and holds the speed up hills.

[Fatzook]

Well thats good considering that you wil void your worthless warranty if you use less than 98RON in the swift sport.

[Ben_Sierra]

Fatzook wrote:

Well thats good considering that you wil void your worthless warranty if you use less than 98RON in the swift sport.

I was once out 100km from the nearest 98RON with the fuel light on so put a splash of 95 in it to get me home. But don't tell Suzuki Australia

[Ben_Sierra]

shep wrote:

i dunno what octane opal fuel is but i had to retard the ignition to 6deg btdc
but it still has plenty of power.
it easily tows my boat at 80kph (4th gear)and holds the speed up hills.

Wikipedia wrote:

Opal is a variety of low-aromatic 91 RON petrol developed in 2005 by BP Australia to combat the rising use of petrol as an inhalant in remote indigenous Australian communities.

[alien]

i've used 92, 95 and 98 in mine.. i get pinging with 92 on a hot day with heavy acceleration, i get minor pinging with 95 in same conditions and zero running 98...

im trying to use 98 when i can but drop to premium if its not available.

[SuziBlu]

Fatzook wrote:

SuziBlu wrote:

The higher octane is the cheaper fuel.

Sounds wrong I know, but you will travel further on the higher octane liter for liter, also, you will notice an improved response.

IF you do decide to run better fuel, run the old useless fuel out as far as you dare, this way when you fuel up there will be less dilution of the good fuel.

I don't get better mileage, or more power. Infact the only car I have ever owned that saw any advantage was my 300ZX. But it was a jap import and already tuned for higher octane fuels than the rubbish we get over here.

The thing I like about the higher octane fuels is that I can't hear my motor melting from the inside on a hot day

If you do nothing other than use the better fuel then there will be little or no change, other than the no pinging, if you tune your car to the better fuel, then you will see power and milage gains.

Easy with a carby, not so with an injected car, their computers will only do small changes.

If you really want to see optimum gains on your injected motor, take it to someone who can alter the computer.

[Brenno]

91 in my Galant VR4 - 4g63t
91 in any carby zook motor I've owned
91 in n/a g13bb zook
at least 95 in supercharged g13bb zook
91 in any car that doesn't require it.

meh...

[zook95]

SuziBlu wrote:

JrZook wrote:

zook95 wrote:

i dont know it only pings when backing down gears with high revs

Errr WTF? You sure its pinging?

Missed this one. Pinging when backing down thru the gears ay, that is a bit of a contradiction in terms.

Pinging only occurs upon heavy acceleration, fuel is exploding not burning, fuel is to fast a burn rate (low octane) or timing is advanced to far.

Slower burn rate fuel, (high octane) or back off the timing.

yeh theres a ping ping ping after backing down gears would a hole in the exhaust be causeing this then?

[zook95]

brodie03 wrote:

I am sorry to ask such a noob question, but the "pinging" noise you are referring to, is it like a kind of whooshing sound? That is the only way I can think to describe the sound I hear while accelerating.

ohk its a loud popping sound to me it sound like it coming from the mid exhaust lh side

[SuziBlu]

Rich gases back burning by the sounds.

[jonno_racing]

98 as oftin as i can in my g13b
i will probably run 95 on my long trip.. easyer on the wallet.

[shakes]

SuziBlu wrote:

Whooshing, sounds to me like your hearing induction noise, from the carby.

Pinging is more like a "tink" sed in a mickey mouse voice, hit two hammers together softly type tink.

Best description I've heard of it is it sounds a bit like the rustling of fallen leaves only a little more metallic

[JrZook]

zook95 wrote:

brodie03 wrote:

I am sorry to ask such a noob question, but the "pinging" noise you are referring to, is it like a kind of whooshing sound? That is the only way I can think to describe the sound I hear while accelerating.

ohk its a loud popping sound to me it sound like it coming from the mid exhaust lh side

Its a backfire, caused by lean burn. Usually caused by an exhaust leak.

[ZookFisher]

believe it or not but i just run ethenol cheap shit fuel in my 94 model sierra. runs great start straight away doesn't blow smoke.....

[JrZook]

ZookFisher wrote:

believe it or not but i just run ethenol cheap shit fuel in my 94 model sierra. runs great start straight away doesn't blow smoke.....

You are a brave man! Be interesting to see how long the rubber carb and fuel pump diaframs last

[holden26]

I run 91 without ethanol and dont have any issues

[brookesy]