Fuel

[MattyP]

No no no 

 

The car is tuned specifically not to knock on 95 hence 98 being a waste 

 

If your knocking on 95 it's either carp fuel or something else is going wrong.

 

Relying on a knock sensor to pull timing is a dangerous game

[Puffwagon]

A few years ago in WA my powerfc detected no knock with bp98, 20-40 knock counts with shell98 which isn't huge and certain united was unusable unless I tuned the car differently.

 

Not that a powerfc is a standardized testing unit but with enough driving and logging it gave me some idea about what fuel supplie I decided to stick with.

[Puffwagon]

8 minutes ago, MattyP said:

The car is tuned specifically not to knock on 95 hence 98 being a waste 

Pics of datalog?

 

I'm thinking it would be pulling a degree or 2 on boost.

[ROB83R]

22 hours ago, masda74 said:

use 95 as a last resort, when you are in the middle of nowhere and there is no 98.

95 don't run to well in these cars. there is a lack of power like there is an anchor behind.

the magic juice is E85, but they still peform average on 98.

 

My car has always used Caltex ultimate. Every so often BP will fill the tank up if the price is right, but to be honest I cant tell the difference.

I never realised that forscan could tell what juice is in the tank. Will need to investigate that one.

Might even check and see if Torque has it on the list.

 

 

It's in the pcm list of pids. Not sure if it's reading what fuel you're using or what's recommended. 

[Ralph Wiggum]

Fuel type it set in the personality data in the BEM. It also lists if the octane setting is hi/lo. These cars are set to HI "95" vs 91 for "LO"

 

More bang per ml of fuel from 98 vs 95 is a no brainer.

[MattyP]

Cmon man 

 

your better than that 

 

octane number has nothing to do with calorific value, all it is, is a resistance to knock 

[Ralph Wiggum]

and hence the ability to produce more bang from the same volume of fuel.

 

 

I must have missed the bit where I said "95 ron has a lower calorific value than 98 ron"

 

 

[MattyP]

'Twas implied 

 

per ml makes it sound so 

 

and nc if your not knock limited on 95 then 98 won't give you any extra power

[Ralph Wiggum]

Twas not implied Twas the way you interpretted my comment

How many of us are not running modded with the intention of running as close to knock threshold as possible?

 

Running both fuels tuned to maximise knock resistance (as most of us are) there's no argument 98 will make more power hence my comment.

[arronm]

1 hour ago, Ralph Wiggum said:

and hence the ability to produce more bang from the same volume of fuel.

 

 

I must have missed the bit where I said "ron has a lower calorific value than  ron"

 

 

You called????