What fuel should actually be used? 99, 98 or 95

[Falsey]

I have a 2017 and use either Tesco or Shell 99, whichever I can reach without running out.

I honestly cant tell any difference between the two.

[tonyb1968]

Ahbefive said:

Considering I have one its obvious I know a great deal more than you. A remap on a standard wrx can yeild 25bhp over standard. Anyone can look that up on google and see that you are talking nonsense.

Sorry im still laughing at this, considering ive 14 years of Subaru ownership under my belt, thats 4 cars, 2 new, second hand in different states of tune, if you really believe that without modifications, ie breathing mods like a panel filter or exhaust mods, you will get good gains from a standard setup....

Edited by tonyb1968 on Wednesday 25th January 08:51

[tonyb1968]

Falsey said:

I have a 2017 and use either Tesco or Shell 99, whichever I can reach without running out.

I honestly cant tell any difference between the two.

The STI is a different kettle of fish to the WRX and has a minimum requirement of 98 ron fuel.

[TEKNOPUG]

tonyb1968 said:

Ahbefive said:

Considering I have one its obvious I know a great deal more than you. A remap on a standard wrx can yeild 25bhp over standard. Anyone can look that up on google and see that you are talking nonsense.

Sorry im still laughing at this, considering ive 14 years of Subaru ownership under my belt, thats 4 cars, 2 new, second hand in different states of tune, if you really believe that without modifications, ie breathing mods like a panel filter or exhaust mods, you will get good gains from a standard setup....

Edited by tonyb1968 on Wednesday 25th January 08:51

There is a large safety margin built into a stock tune from factory, as you'd expect. It's quite possible to net over 25bhp on a WRX but simply fine tuning the fuel, timing and boost. It's not really worth it financially as you'd get much bigger gains by addressing the breathing as you say.

https://www.scoobynet.com/projects-40/882306-willi...

[Ahbefive]

tonyb1968 said:

Sorry im still laughing at this, considering ive 14 years of Subaru ownership under my belt, thats 4 cars, 2 new, second hand in different states of tune, if you really believe that without modifications, ie breathing mods like a panel filter or exhaust mods, you will get good gains from a standard setup....

Edited by tonyb1968 on Wednesday 25th January 08:51

If you don't think that a remap will get results over the standard map then you are just a simpleton.

Obviously a panel filter and fuel pump help too and are cheap mods so worth doing but if you think a remap can't improve on the standard compromised generic map then well you aren't worth talking to.

[tonyb1968]

Ahbefive said:

If you don't think that a remap will get results over the standard map then you are just a simpleton.

Obviously a panel filter and fuel pump help too and are cheap mods so worth doing but if you think a remap can't improve on the standard compromised generic map then well you aren't worth talking to.

Learn to read, something you have not done.

[tonyb1968]

TEKNOPUG said:

tonyb1968 said:

Ahbefive said:

Considering I have one its obvious I know a great deal more than you. A remap on a standard wrx can yeild 25bhp over standard. Anyone can look that up on google and see that you are talking nonsense.

Sorry im still laughing at this, considering ive 14 years of Subaru ownership under my belt, thats 4 cars, 2 new, second hand in different states of tune, if you really believe that without modifications, ie breathing mods like a panel filter or exhaust mods, you will get good gains from a standard setup....

Edited by tonyb1968 on Wednesday 25th January 08:51

There is a large safety margin built into a stock tune from factory, as you'd expect. It's quite possible to net over 25bhp on a WRX but simply fine tuning the fuel, timing and boost. It's not really worth it financially as you'd get much bigger gains by addressing the breathing as you say.

https://www.scoobynet.com/projects-40/882306-willi...

Thats a 2.5, the OP has a 2ltr, hence im referring to a 2ltr

[Ahbefive]

tonyb1968 said:

Learn to read, something you have not done.

Perhaps you missed it "leave car standard and remap for more oomph and better fuel economy".

Will just leave this here. You might learn something.

http://www.cmctuning.co.uk/ecu-remapping/455413803...

[TEKNOPUG]

tonyb1968 said:

TEKNOPUG said:

tonyb1968 said:

Ahbefive said:

Considering I have one its obvious I know a great deal more than you. A remap on a standard wrx can yeild 25bhp over standard. Anyone can look that up on google and see that you are talking nonsense.

Sorry im still laughing at this, considering ive 14 years of Subaru ownership under my belt, thats 4 cars, 2 new, second hand in different states of tune, if you really believe that without modifications, ie breathing mods like a panel filter or exhaust mods, you will get good gains from a standard setup....

Edited by tonyb1968 on Wednesday 25th January 08:51

There is a large safety margin built into a stock tune from factory, as you'd expect. It's quite possible to net over 25bhp on a WRX but simply fine tuning the fuel, timing and boost. It's not really worth it financially as you'd get much bigger gains by addressing the breathing as you say.

https://www.scoobynet.com/projects-40/882306-willi...

Thats a 2.5, the OP has a 2ltr, hence im referring to a 2ltr

No, page 2 has figures for a 2.5WRX which was being mapped. Page 3 and onwards details the 2.0WRX test mule.

"Ok so as Andy said I spent all day yesterday with the test car on the dyno. I have to give great credit to Andy and his engine building skills, it has done only 200 miles from the rebuild before strapping it on the dyno and doing the best part of 90 runs!!

I started of by reading and resetting the ECU to log the first fuelled run before it learnt a/f and ignition correction and generally analysing and testing the results of the ecu learning ability to my surprise.

It's important to note the following:
Forged bottom end only, but otherwise completely standard exhaust, turbo, airbox, filter etc etc.
Running on Vpower and had been since rebuild.
Logged intake temperatures were very similar to road temperatures, will do a road dyno run over the weekend to validate results.
Best dyno run was with the up-pipe hot, i.e one run then immediately another.

So then I set about putting a map on it to get the most out of the setup. It's worth remembering that it still has all three catalytic converters in the exhaust setup.

Andy bought some 7 grade plugs from Ebay to have a go with them. To be honest I was very dubious about them as you might expect but the results were pleasently surprising. No other changes done from the run above to this one:

Not bad for a standard Bugeye Impreza! I had brought a pre-mix of Meth/Vpower with me to the dyno to try out on the car, but due to the Injectors running at 95% on both standard and remapped, (yes 268bhp was achieved with no extra fuel!), I had to modify the map to run low boost for the results to be meaningful in terms of percent of power increase:


The before,(red), is running with the injectors scaled to run 13% more fuel to make the AFR correct and low boost duty. The after, (blue), was running with extra ignition timing and netted an overall 10bhp gain and the same in torque.
I don't have a Vpower version to compare to see whether netted any gains without changing the map, but I will put that on the list for next time! Hopefully when we have some injectors big enough to cope with the Meth mix higher demand on fuel AFR.

So to sum up:
Standard, 220.4bhp and 205lb/ft.
Vpower map on NGK 6 plugs, 261.2bhp and 278lb/ft.
Vpower map on NGK 7 plugs, 268.4bhp and 282lb/ft.
20% Meth/Vpower netted 5% power increase when tuned."