Hi All,

Just wondering if anyone runs premium unleaded in their TF ? - I was considering it because my mechanic told me it would better for the engine.

Any ideas or opinions on this?

The search buttion is your friend here, there are about a million and one posts on this topic.

Don't expect a change in power that you can feel, but your car will run smoother on BP ultimate and generally will achieve better fuel ecomony if you don't flog it with the extra 2kw of power

I don't really tell the difference between premium and Ultimate, (premium being 95 octane) But i'd definatly go premum over regular

Your mechanic is right, all Jap engines are made to run on premium. If you can afford to do it, go with the premium. They say it also adds a bit of power and claim a full tank of premium will last longer than normal, but I can't say if it's true? :doubt:

I'll start by filling it on the weekend. I was a little worried that the higher octane might damage the engine over a period of time (eg, your car needed to be tuned for it) but i'll give it a try.

i just swapped to caltex vortex...and can def notice the diff in economy. just dont stick the boot in too much and u'll notice it. And im told its helluva lot cleaner than 2cents off at woolies...

My understanding is that since the 3rd Gens do not have a knock sensor they will not adjust the timing to take advantage of the PULP. You get a better quality fuel and it keeps your engine cleaner, negating the need for a fuel injector clean every 12 months.

I know that you can get 3rd party chips that can be tuned to run on PULP but is it possible to get Mitsu to tune the car to run on PULP? Can Mitsu reprogram the ECU?

Since we are on the topic, does anyone know why the 2nd gens had a knock and the 3rd do not. What do the 3rd gens do to stop the knocking?

My understanding is that since the 3rd Gens do not have a knock sensor they will not adjust the timing to take advantage of the PULP. You get a better quality fuel and it keeps your engine cleaner, negating the need for a fuel injector clean every 12 months.

Since we are on the topic, does anyone know why the 2nd gens had a knock and the 3rd do not. What do the 3rd gens do to stop the knocking?
I keep reading here that 3rd gen's don't have a knock sensor.. but the Mitsu Tech Docs (for the TH) clearly refer to one. I'm no mechanic so I've never tried eyeballing the thing but I'm told by friends that most newer cars have them and it would be very odd for mitsu not to have included one. Also that running petrol of a different RON would cause knocking if the engine was unable to adjust it's timing (using the knock sensor).

Can someone clear this up??

Not aware of anyone being about to modify any fuel maps or ignition timing with the MMAL unit. Only an aftermarket system can do this.

MRT in sydney have a company they deal with which reprograms the ECU. they are ECUTEK http://www.ecutek.com.au/ , they can program your ECU to have 2 fuel maps, one for regular unleaded and one for premium unleaded, and you just switch it over when you run either fuels. Not sure on price though aswell?

I keep reading here that 3rd gen's don't have a knock sensor.. but the Mitsu Tech Docs (for the TH) clearly refer to one. I'm no mechanic so I've never tried eyeballing the thing but I'm told by friends that most newer cars have them and it would be very odd for mitsu not to have included one. Also that running petrol of a different RON would cause knocking if the engine was unable to adjust it's timing (using the knock sensor).

Can someone clear this up??

I'm with you, there are several references to the knock sensor in the manual.
Take a look in the fuel injection section and wiring diagrams.

I generally run the normal unleaded fuel then every 2nd or 3rd tank fill up with premium (95 RON). Will this cause any adverse effects on the engine by switching fuel types (between normal and PULP) all the time?

I'd like to run 95 or 98 RON unleaded all the time but the $$$ is too much for a family man such as myself.

I heard premium was much better for the injectors..??
Ive run all my EFI cars on premium, and put my first full tank of it in the TH on the weekend and did a country trip. Got 10.4ltrs per 100ks with a bootfull of tents and chairs etc. Gave it a bit of a hammering on the way up as it was the first country trip ive done in it, but treated it nicely on the way back.
I dont think, on an ordinary engine, that youd tell the power diff. On a performance engine you would though. Moslty its just better economy and a cleaner burning fuel (I think, but dont quote me!)

Pete

I would have to disagree with the no power increase theory... when I ran it in my TF solara (Auto 3.0L) I found that the acceleration was Heap better & more resposive as well. I ran Exclusively BP Ultimate (98 RON) and when I had a poor week an had to run regular I was Sh*te!! The actual DYNO power may not have changed signifigantly but I could notice it in the Driveability for sure

Dunno man, Just telling you my expirience in my car. Mebbe other ppl dont feel this, maybe Im totally wrong... Just what i thought

Fair enough then eh... Didnt realise it was that minute! I can definately feel the difference in the ralli///art though... I wonder if there would be a dyno difference as it is a performance car eh but it would be intereesting to find out. I was also using an after market oil additive in the TF so that may have helped with the PULP mebbe...

I only use BP Ultimate = I figure keeps the car clean, slighty better fuel economy and apparenlty better for the environment.

Hi All,

Just wondering if anyone runs premium unleaded in their TF ? - I was considering it because my mechanic told me it would better for the engine.

Any ideas or opinions on this?

When i bought my TE Altera 5 weeks ago,took the fuel tank out cleaned it changed the fuel pump then put it back,change the fuel filter,burrowed my mechanics(good friend of mine:D ) injector cleaner clean the injectors,replace the plugs & the leads,flushe the engine new filter with valvoline synth. oil also flushe the tranny (twice)new filter and castrol tqm tranny oil+ nulon tranny oil enhancer and ever since using Shell Optimax.Easy starts,very smooth and very responsive cant hear the engine running.Hats off to Mitsu boys,fantastic piece of machine :bowrofl: .

When i bought my TE Altera 5 weeks ago,took the fuel tank out cleaned it changed the fuel pump then put it back.
Was there much in there? The amount people talk about crap in the fuel tank you'd expect an inch of sludge or something :)

Not much to wright home about but it was well worth the effort.

You've got *way* more time and energy than me, dude. :)

Z

When i bought my TE Altera 5 weeks ago,took the fuel tank out cleaned it changed the fuel pump then put it back,change the fuel filter,burrowed my mechanics(good friend of mine:D ) injector cleaner clean the injectors,replace the plugs & the leads,flushe the engine new filter with valvoline synth. oil also flushe the tranny (twice)new filter and castrol tqm tranny oil+ nulon tranny oil enhancer and ever since using Shell Optimax.Easy starts,very smooth and very responsive cant hear the engine running.Hats off to Mitsu boys,fantastic piece of machine :bowrofl: .
How about the cooling system? :P

You've got *way* more time and energy than me, dude. :)

Z

I was acting on a good advice for trouble free enjoyable motoring.Spending day and a half to protect my investment was fun anyway.

MAGNETTA = How about the cooling system? :P

Yes,flushed , cleaned filled with Mitsu Diamond coolant..Only thing left to do now,replacing brake fluid which i'll be doing it this weekend.Shouldnt take more than couple of hours.

Considering the reccomended fuel for the ralliart magna is regular unleaded, as it was designed to run on it for the australian market, I don't see the point in running a standard magna on premium.

I use Optimax and Ultimate for 2 reasons.

1. It is a cleaner fuel and keeps your engine cleaner negating the need for an injector clean. Since and injector clean is about $300, the extra $3-$5 a week is easily justified.

2. They are better quality fuels. By this I mean you are less likely to get a bad batch of fuel. High performance (high compression) engines are designed to run on 98 RON (in australia, anyway). If these engines were to get a tank of dud fuel, they could easily be damaged. 98 RON fuel is guaranteed to be a better quality (less crap like alcohol and toluene) than the 91 RON fuels. Alcohol and Toluene burn at much higher temps than normal petrol which can cause damage to your engine as well. The premium fuels will always be of a more consistant quality hence giving (me, at least) peace of mind.

If you've ever had a bad batch of pterol in your car you'll know what I mean.

We used to use the cheapest petrol we could find, which turned out to be false economy. We generally found 10-20% less mileage, and in once extreme case 30% less. The petrol had been watered down so much. The worst scenario, while on holidays and filling the whole tank up at a Woolies store, we couldn't get the car out of 2nd gear without stalling and shuddering. Not a pleasant experience on a quiet country road with no mobile phone coverage.

I've used only Premium in our cars for the last 5 years and never had a problem.

I use Optimax and Ultimate for 2 reasons.
The premium fuels will always be of a more consistant quality hence giving (me, at least) peace of mind.
If you've ever had a bad batch of pterol in your car you'll know what I mean.
We used to use the cheapest petrol we could find, which turned out to be false economy. I've used only Premium in our cars for the last 5 years and never had a problem.

I concur. Very well said.

I have a 1991 Magna TR with no modifications on it at all. Stock goodness.
Its got 193kms on it, never had any problems with it at all. Just wondering, If I ran it on BP Ulitmate, would I get any economy advantage in it, or not? Is it safe for this 14 year old car to use it?

Cheers.

I ran BP Ultimate in my TR (210k on the clock) for months, never had any trouble at all. Very slight improvement in economy, noticeable improvement in responsiveness.

Z

I have a 1991 Magna TR with no modifications on it at all. Stock goodness.
Its got 193kms on it, never had any problems with it at all. Just wondering, If I ran it on BP Ulitmate, would I get any economy advantage in it, or not? Is it safe for this 14 year old car to use it?

Cheers.
Mate, I've run my TS on optimax ever since it came out, I swear by it, much smoother and the extra cost is offset by the improved fuel econ(if you don't drive it too hard that is).

I run 98RON in the Ralliart too, not sure if it makes a diff in that cos I’m not game to run anything else even though the book just recommends std unleaded.

yeah its good....car runs smoother...better economy...didnt notice any powergains...

I have found that if i run pulp from Bp, Shell that my cars surges and uses more fuel and get 430 off a tank. But ulp from those stations 520 but when i use caltex vortex i get 530 to 600 depends if i do highway runs. but i avevrage 11.5 to 12.5 per 100 kay in hobart then driving from hbt to launceston 8.9 to 9.5 so i think caltex vortex is best. but it the only 98 octaine here so far, the rest is ulp 91 and pulp 95 and vortex 98

running my tf on ulp gets me bout 10.5l/100km round town and about 7-8l/100km on the highway tried pulp was smoother but economy didnt improve and the extra cost is not worth it. yeah sure an injector clean is dear bout $22 an injector but every month run redex fuel treatment or wynns or one of those cost about $10 way up the cost and do the trials yourself and let u be the judge


by the way car sold on the aussie market are tuned to run on our available fuels (mainly ulp)