Search the main technical forums. I remember a guy said something about losing close to 25kw for having the A/C on.

I don't believe that, because the magnetic clutch releases when the car switches to open loop.

NRMA generally says about 3% fuel efficiency is lost with A/C on.

 

Only Shell Optimax and Mobil Synergy. No Caltex unless I have no more gas. I dunno why they dont sell it here in the US. HK has it everywhere.

 

The reason that the race cars use Optimax is because they won the contract.............. its all about politics and money. If they are all running on it, no one has an advantage. So basicly they could all be running on regular unleaded and whilst lap times would be slightly down, we would be none the wiser.

 

i used em all and i actually found caltex vortex to be the best followed closely by mobil then bp - optimax does **** all for my car.. i get less k's and significantly less power! with vortex i get 450-500k's with optimax i get 350ish!

 

I once did quite a bit of dyno testing on a Camry. One test was with A/C on and A/C off. Difference: about 2 Kw

 

Actually if you ever take time to do some research into different types of fuels.
You'll be surprised that Woolies is probably one of the best for your car in the long run. The reason being is that they don't so called "dilute" there petrol to increase there income rate per litre.

You'll find that alot of private owned petrol stations do this alot. I personally try to avoid them as they "do" dilute their fuel with ethanol to increase their income. As they find it hard to compete with bigger companies such as BP, Shell, Mobil and Caltex.
Mind you, for some of you out there private owned stations maybe best for your convience in the long run. eg. location of residency.

I think there was an Episode on 'Today tonight' once where they explained this.

Anyway i perfer Shell Optimax. I find that it's clean running and i get better milage than other fuels. Oh and be careful for Mobil, my mechanic said that they've been known to have traces of water in there tank reserves. Causes ya car to misfire.

if anybody has anymore info i'd like ur feedback.

Cheerz

 

Woolies petrol is imported from overseas and uses MTBE in it - an alcohol which is extremely toxic and has the same effect has Ethanol on your engine.

I wouldn't put it in a car that I was about to scrap.

On the good new side, they actually are switching to a non-MBTE laced fuel in January.

This information is only valid for NSW, in QLD, Woolies buys their petrol from Caltex, so it's the same fuel you get from Caltex stations.

 

Interesting. Is open loop only used when rpm reaches a certain figure or when the throttle is open a certain percentage or a combination of the both?

I ask because I usually find that AC turns off around the 3000 - 3200 mark in my Magna and I feel a kick in useable power. Understandable. But when I'm driving without AC and I take off from the lights, I find that it hits just after 3000 and the engine just seems to come alive. It was really noticeable at the drags the other week. I managed a 15.8 with my manual 3.0 sedan and the guy I raced said that it look like he was slowly falling away then I took off. Werid. Any thoughts?

 

I was using BP ultimate again the other day, what a revelation. I am trying to get this stuff happening in our town providing there is enough interest shown.

 

Sorry, I must have missed this post when you originally put it.

Yes, open loop is engaged usually at a certain throttle position, or at a certain RPM (EG, the S2000 Open loop is 40% throttle, if below 5500rpm, or any throttle position, if over 5500rpm - from memory - don't quote me on these figures)

Hope this helps.

 

Personally the way i see it is that Woolies is the worst, i once filled up with regular stuff and b4 i knew it i had no fuel and i had no power what so ever, ive used that BP stuff which inst 2 bad. But it can be quite expensive, Caltex? LoL they are just worthless, they dont have hardly any shops what so ever around Melbourne, and quite frankly their fuel isnt up to scratch. Ive found that not only is Regular Unleaded from Shell heaps better but you get more Km'z 2 out of it, But in the End optimax is the best fuel to use, you get more km'z you get better power and the car just perfectly runs on it and its at a decent price. They were the first to bring it out and they are the best. Shell spent money on this fuel, it wasnt like the rest who just said yeah we got high octane fuel 2. One person said it was a marketing ploy from the V8 supercars? i dont think so, these guyz are fair dinkum about winning buddy they aint gana use crap fuel, they use the best and optimax is the best. If Ferrari use it who have BILLIONS invested in F1 then why wouldnt it be good? seriously think about it

 

The Fuel question,

I may be a little late,

But here is the latest I got from a bunch of guys that Service my SeaDoo, (History, these guys tune a lot of race ski's, and doa fair bit of there own riding)

Rating.
1. Mobil Synergy 8000
2. BP Ultimate
3. Shell Optimax
4. Caltex Vortex

I hear the Vortex stuff, is only 96 octane ...

Intresting use about the Shell Optimax stuff, Dont know if this is true or not, so dont hold me to it, I heard it from a pretty reliable source .... The Octane's or Octane properties from the Optimax fuel, evaporate, at a much faster rate, than all the other brands.
i.e. I hear the Optimax fuel is good for 1 day in your tank, then it looses its octanes ....

What do people make of that ... ??

Because I've been using Optimax as my primary choice for a while ...

 

So far as I know only the BP is 98, all the rest are 96. Am I correct, maybe I should look up Mobil's site

 

No, Mobile Synergy is 100% 98, so is BP Ultimate, and Optimax,

But I dont know for how long Optimax stays at 98 Octane.

Interesting question, can anyone eloborate on the possibility that fuels loose thier octanes over time, i.e. do they have a use by date.

If so, which fuel is the worst of the lot ..... ????

 

Yep you are correct about the Mobil.

And right on the Shell as well!!

I know for sure Vortex is 96!!