Fuel Again

I am talking about the Kluger - Same motor as the smaller Lexus 4x4 - Presumably re-tuned.

Most cars out there today - minus those wrx's - are not made to run on 98RON and most will start to ping whenthe RON is this high......

Most cars are good for 95 - 96RON at the most and do alot better if the fuel has an injector cleaner in it ( not justnormal premium)......

We do pay more for it at the bowser but from my experience and the Q's i have asked (from behind the servo counter) its a lot more worth it because of the extra km you recieve......

but older cars are good for normal...

Have also heard that too much injetor cleaner going through all the time can be more corrosive than good.....

for a Kluger I would suggest a good 96RON with injector cleaner in it .

Thats just imho though

but i agree with exploder - this can be argued till the cows come home...oh hang on they are home!! (for me anyway)...

forgot to add - it also depends on where you buy the petrol from too!!

Laura B

"Most cars out there today - minus those wrx's - are not made to run on 98RON and most will start to ping whenthe RON is this high...... "

forgive me if I am wrong, but isnt this arse about? If you run a car intended for PULP on ULP, the result is likely to be pinging?

Maybe that's why the Futch catalist doesnt work, makes the RON so high the engine pings.....LOL

Laura, you have it the wrong way around. You will do no harm other than to you pocket, and you may actually do some good as the higher RON fuels have better quality detergents/lubricants (lead substitutes) than the basic ULP.

As for the pinging, it goes away with higher RON.

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"...it may benifit from PULP, since the engine management system could advance the timing to take advantage of it...."

You mean "...IF the engine management system could advance...".

EFI systems work to a "map" stored in their memory. Most systems have a preset "maximum" advance for the ignition, at a given load/throttle position/RPM usually calibrated for standard 91 RON fuel. Even when fed the 95/98 RON fuel, unless the ECU has been altered in some way, the maximum timing advance point will still be the same (as per the map). The timing will be retarded (taking inputs from the knock sensor) if the fuel is not even up to the 91 RON standard to prevent pinging (minus one or two RON points).

Having said all that it is possible for a vehicle to have an ECU set up for PULP 95-98 RON but with a wide enough internal "map" to be able to handle 91 RON based on inputs from the knock sensor. The ECU has to take some time learning the fuel characteristics, but they usually try to keep the ignition timing at the peak of what the fuel (or blend) can do, so if you fill up with PULP it will "come to life" again after running on ULP.

I got a mate with a Supercharged Monaro (17PSI) tuned for 98, Wonder what would happen if he run that on 91.

WE keep trying to get him to take the 19’s off and put the 15-inch Commodore steel pursuit Rims on it then tow a boat around with it. LOL

with a car like that, economy is not important. my car was a daily so i wanted top go further on a tank. knock sensors and all the rest take care of any low RON probs.

480km from a WRX? I used to be lucky to get 350km :-)

Think the right foot had a lot to do with it!!!

"Most cars out there today - minus those wrx's - are not made to run on 98RON and most will start to ping whenthe RON is this high...... "

forgive me if I am wrong, but isnt this arse about? If you run a car intended for PULP on ULP, the result is likely to be pinging?

posted above in wrong place sorry!

yeah but knock sensors can advance and retard the timing and take care of pinging. It's just performace is supposed to suffer. I wonder if a boxer engine has anything to do it. Anyone got a 911 to try it out on? Drop it at my place for a once off FREE offer, thats right FREE 6 months test.

Forgot to add, a girl I know had a Nissan Maxima and that ran like total crap on ULP, pinging and farting around but switch to BP Ultimate - different car. It was fully imported from memory so maybe that has something to do with it.

My old Kawasaki Z1000 hated ULP too, but ran like a clock on BP Ultimate.

I forgot to add, every car in my experiance with this has been a subaru. Maybe subaru are playing funny games with their engines!