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Question:

You guys say that the car needs to be re-tuned if you use the 100RON fuel right? If not it may/will cause damage due to the engine running too lean?

My question is how you get the car to the tuner once you fill the car up with this stuff (100RON)? Granny it to the tuner? Obviously I'd need to drive around to burn off the excess non-100RON fuel first right?

For those too lazy to click on the link

Coles Express Dickson Cnr Antill & Badham St Dickson ACT

*Coles Express Carlton 277–281 Princes Hwy Carlton NSW

*Coles Express Darlinghurst 47 Flinders St Darlinghurst NSW

*Coles Express Dundas Cnr Kissing Point Rd & Kirby St Dundas NSW

Coles Express Fairfield Cnr Polding St & The Horsley Drv Fairfield NSW

Coles Express Green Valley Cnr Cowpasture Rd & Green Valley Cartwright NSW

Coles Express Hurstville 39 Forest Rd Hurstville NSW

Coles Express Kingsford 48–56 Gardeners Rd Kingsford NSW

Coles Express Kirrawee Cnr Princes Hwy & The Boulevard Kirrawee NSW

Coles Express Lidcombe 18 Parramatta Rd Lidcombe NSW

*Coles Express Marsfield Cnr Epping Rd & Culloden Rd Marsfield NSW

Coles Express Neutral Bay Cnr Ben Boyd Rd & Ernest St Neutral Bay NSW

Coles Express North Ryde Wicks 96 Wicks Rd North Ryde NSW

^^^^^^Places listed on Shell.com as stocking 100 Optimax^^^^^

My 0.02c: not enough places stock 100RON fuel to make the effort (and cost) to retune for the time being*.

A question for Jim: if you tune for this new fuel, what do the AFRs look like when you stick 98 back in (without altering the tune again)? I would assume rich, but how much extra timing (if any) did you wind in?

* For me, anyway. None of the petrol stations are anywhere near me, and the last thing I want to have to do is drive around like a granny looking for a Shell stocking 100RON fuel.

i wouldnt get it tuned for that just for the fact that u cant get the fuel from many places, so if you go for a nice drive out to a small town of something, you wont get the right fuel. ok for a race car or something you never drive far.

Problem with that midnight is you would get a mix of 100RON and 98RON and have a crossover period.. but that's about it..

What about running it in a Stock R33 - resetting the ECU - they run rich as they are - but would the timing need to be changed?

That is right but if you use it you need to retune the engine as the 100 uses 2 percent oxygen

Shouldn't that statement be:

"To make the same power (as 98) with 100,and have the correct mixture, you need to retune the engine as the 100 uses 2 percent more oxygen therefore the engine will run leaner." or something like that :P

Please correct me if I'm wrong, Jim. Putting 100 in a car tuned to run on 98, 95, or 90 will not make the engine run leaner, it just wont burn all the available fuel.

40 killowats aint to bad at all Jim. Has anyone checked the price of the 100ron vs optimax? Certainly seems like good value considering you got more than 10% extra power out of this GTR.

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