91 Unleaded Tune

Have begun testing the prototype tune I have done for this fuel today. Have filled up with cheap unleaded you stick in a falcodore and initial results are good, a lil bit of pinging that can only be slightly heard at certain heavy loads which I half expected indicating I did not retard the map too much. Just need to do abit more analysing and adjusting the map accordingly. I am running .8 bar of boost which is closer to .95 with standard turbos or 13 PSI. At 13 cents a litre less, you sure notice a smaller amount you have to pay at the bowser

Also, costings for the tune changer I posted earlier we are looking at less than $200 but I dare say it will be even less than that. Tune Changer, ha, I need a catchier name than that hey

For those with no idea what I am talking about, I am currently developing a device that will allow to change between two different ECU tunes on the fly with a flick of a switch. It will initially be offered with the low octane unleaded tune I am currently working on to save you money on fuel costs and also have a stock tune or your own custom tune available by flicking a switch after you fill up with 98 octane or other jungle juice in your tank.

 

This is a joke right? Why anyone would even run 91 in their Z is beyond me, if you want better fuel economy by a 2.0L 4 banger... Geez!

 

agree.
i quit one of my old old jobs because they wouldnt allow me to fill up the zed with 98 octane. found a new job instead of putting that 91 bs in.

 

have to agree,if i want fuel economy,i drive one of our other cars,theres no way i would put crap like 91 in my zed ,as far as i know,economy and zed ownership should never be said in the same sentence,sh*t i just did it

 

No it's not a joke. Some people unlike yourself would like to have a car that can have the ability to run a tune for lower octane fuels to save a few dollars and be able to switch to a perfomance tune when they feel like a thrash rather than paying for high octane fuels for general or long distance driving. Bet you didn't know that the Holden Barina comes out with a selectable tune between low and high octane fuels.

And the reason why people would want to run 91 in their Zeds is beyond you because you obviously can't think that far ahead.

 

listen mate no need to get firey because we dont like your idea. ROFL at you comparing the barina to a zed. you dont buy a supercar for fuel economy buddy, its for the sheer driving pleasure.

 

I suppose you have never considered that there are a lot of people on this forum who don't have the luxuary you have of driving one of their 'other' cars?

 

mate i am 19. zed is my daily driver and only car.

if they really wanna save petrol you should just charge them by the hour to teach them to keep their foot off the accelerator.

 

So you are allowed to bag my idea but I am not allowed to retaliate? Grow up mate, your not in primary school anymore.

 

how am i bagging your idea? i am jsut saying people who actually go to you to get this done are idiots.
best way to save fuel is your right foot.
i made it home from williamstown to rowville on $8 worth of petrol (check it up on whereis.com for km's)
how is that for fuel economy?

 

No worries bud. Me and the idiots will have the last laugh.

 

seems a good idea to me.. would certainly ease any worries when doing long trip and not knowing where 98 is available! fuel economy would be a bonus.

 

you will of course be having the last laugh because you will be getting money from these idiots.

id rather pay an extra 10c a litre more then 91 octane and have cleaner / better fuel which in turn will be better for my car. if you want to be a tight ass or couldnt afford a zed, why buy one anyway?

 

Dude

Dont go around calling anyone who thinks this idea might work idiots
cheers

 

I applaud your initiative 90TTZ......

although your idea does not appeal to me (I'll still be using 98 when it's $2 ) it does have some merit for a DD I suppose. Have you thought about marketing your "twin tune" to performance people, i.e a 98 road tune & a jungle juice tune for some of the track & straight line boys (and/or girls)

I am assuming you are just creating a switchable facility and the end user gets to install his/her own tunes. Otherwise it's just another off the shelf "close enough is good enough" tuning solution

 

If you guys did read the other thread you might understand at what he is doing... To start off with his driving down to brissie which is an 18 hour drive from Townsville... Its not your short run of the mill to your local maccas to hang out with friends... The deal is he is making a chip so that on the highway you can run lower octane fuel then having to fill up with high octane fuel and burning it just as quickly as you would with low octane fuel... As a lot of places if you even go over aust Do not sell 98 octane fuel as most of them either run diesel or 91 octane in there cars...

It may or may not appeal to some people but no need to act like a tool about it either... It has nothing to do with being a tight ass or anything like that its pretty much trying to say well hey its all in the custom chip that has let me run lower octane fuel and i get the same amount of highway kms out of this tank then i do with 98... So you are making a saving of some sort...

Just because you go out and buy a 4 banger car don't mean crap... most of the new car's today can run E10 so what is the difference? The fact that newer cars can run E type fuel while your zed's done because of how the injectors are setup on the zed's and older type cars... When a holden V8 or ford V8 or turbocharged car come from factory the tune in them are tuned for 95 octane... All you have to do is make a custom tune and you can run 91 octane as well...

I think Karl is doing a good job and is not a slack ass like some people on here and is trying to help others out and has a lot of great info to share... His car was off the road for a period of time and has had a rebuild on his motor and has upgraded turbos as well has made some good power and has sent his car down the 1/4 mile and not try and race every tom dick and harry off at a set of lights... So i think he knows what he is doing unlike some people on this forum...

If you didn't like what this thread was about why post in it? All you had to say is i don't agree with it not act like a little school kid who has the sads because mummy forgot to put your roll up in your packed lunch...

Karl keep up the good work mate so far so good

 

I will be interested in how your project progresses Karl, getting 98 octane fuel when you travel west past Mt Garnett and other areas of FNQ gets real hard and in the past I have had to take octane booster just in case.
I am astonished by the attitude of some of the people here. Their immaturity is showing.

 

Lots of modern cars have a 'twin tune', just runs of the det sensor, senses detonation and retards the timing, pretty simple.

Has any trials been done between 91 octane tuned for economy and 98 tuned for economy? It'd be interesting to see which is actually more economical

 

yeah i was thinking that too.... because the 98 runs better and longer than the 91 but maybe not in this case... good luck with the idea mate

 

There is nothing worng with 91 RON petrol (assuming the petrol you get is of decent quality). 91RON petrol is not designed for our cars as it will cause knock or pinging due to the high compression ratios (NA's) and that turbo vehicles need a petrol that won't combust on compression.
I think 91RON gets its bad name because people seem to thing that 98RON is cleaner. Its just that they add detergants and alike to higher RON fuels (its like running a small part of injector cleaner in every tank).
The RON rating of a petrol does not rate how good or bad it is, rather it rates the fuels resistance to autoignition (pinging). The chemical in petrol that gives you the rating is the percentage of iso-octane to heptane. Iso-Octane is what gives you the RON rating as it is the chemical that is resistant to pinging. So if you had 98 parts iso-octane to 2-parts heptane you get 98 RON rating. And obviously 91RON is 91 parts iso-octane and 9 parts heptane. SO going by the RON rating you can say that 98 octane fuel is more resistant to pinging than 91 octane fuel. And you might have heard of fuels with greater than 100RON rating (avgas etc), thats becuase the chemicals in those are even more ping resistant than iso-octane so they assign ratings higher than 100RON to these fuels.
91 RON is not crap petrol (it just depends on where you get it from), its just not what Nissan wanted us to use in our cars as the 91 ron will cause pinging in STOCK TUNE. Nissan wanted to maximise the output of their engines so using 95RON tunes allowed higher compression ratios (NA's), more boost on TT's and an advance in timing. This is what karl is trying to change. I'm assuming he's playing around with all that. Once it has been perfected, Karl's tune should see his car running on 91 RON without pinging.
The only difference would be a drop in power as he must drop the boost on his car to prevent pinging. And seeing as he only plans to use it on his highway runs, this shouldn't be a problem.
I'd be interested to see how this turns out. I don't do alot of highway driving though but it will be interesting to see your savings from running 91RON on the highways.
Good luck with it.