All Things Mk5 > Mk5 General Area
95 RON
Tarmac_Terrorist:
--- Quote from: Oli on August 16, 2009, 11:08:58 pm ---You'll be wanting to put budget tyres on it next!!!
Don't do it, the engine was designed for the higher octane, and the FSI engines need it, for lubrication and cleaning purposes
--- End quote ---
Oli, how does the higher octane fuel lubricate / what does it lubricate / clean - especially with direct injection?
DaveB@Vagbremtechnic:
The cleansing properties of fuel have nothing to do with the Octane rating, Shell Fuel may have cleansing properties that Esso doesnt have and vice versa, the octane rating demonstrates the calorific value of the fuel and its detonative behaviour. In the old days of 4* it used to be tetra ethyl that used to be used to bump up the octane value, Old aircraft engines used to use 110 octane for more power.
I'm not sure what they use now - any metallic compounds will reduce knocking obviously not lead anymore.
Anybody who has decatted should technically be able to use 100 octane aviation fuel - anybody willing to try it :jumping:
iainalpine:
95 RON - this cant withstand high compression pressure. you will find at the end of the compression stroke the pressure is at its highest point, this when using 95 RON will allow the remainder of the air/fuel mixture to detonate/knock.
99 RON - this can withstand higher internal pressures and temp's.
I remember back in the days of running the impreza with the GEM's engine management ECU, i could switch between 95 and 99 RON, but when dropping back down the car felt so much slower. The gems ECU allowed the use of a flick switch to switch which changed the timing setting pulling the timing back quite a few degree's.
Advanced Knock controll found on MKV's allow the ECU to controll timing very well, but when pushing on with 95RON you will find a lot of correction.
Bottom line..............................stick with 99 RON
Just my 2 pence
Iain
tony_danza:
--- Quote from: DaveB1970 on August 17, 2009, 07:21:17 am ---The cleansing properties of fuel have nothing to do with the Octane rating, Shell Fuel may have cleansing properties that Esso doesnt have and vice versa, the octane rating demonstrates the calorific value of the fuel and its detonative behaviour. In the old days of 4* it used to be tetra ethyl that used to be used to bump up the octane value, Old aircraft engines used to use 110 octane for more power.
I'm not sure what they use now - any metallic compounds will reduce knocking obviously not lead anymore.
Anybody who has decatted should technically be able to use 100 octane aviation fuel - anybody willing to try it :jumping:
--- End quote ---
I was running mine on 100 at the 'Ring - it was an animal on it!!
Janner_Sy:
i use shell v power racing 100. and it makes the car run sweet
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