What fuel to use with the VAG 2.0 TFSI?

saitrix

saitrix

saitrix

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Hi,

My Dad has a Leon FR with the 2.0 TFSI engine, just wondering really, does it have a knock sensor? Trying to work out if he would gain anything from using a higher octane with it. Right now he is running it on usual 95.
 
They do have a knock sensor but are tuned to run on 98 ron from the factory so runs best on this. I have had only one tank of 95 ron in it on a return trip off 600 miles and it dropped 2mpg off with a steady cruise at 75-80 also didn't feel like it liked reving the last 1000 or so revs towards the redline.
 
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saitrix said:
Aha, will let my Dad know this. He has got 32-33mpg out of it so far with mixed driving.
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My overall average is 32-33mpg aswell, worth trying a few tanks of 98ron or 99ron v power so the ECU can adapt before making a decision on it. The way I look at it is the difference a tank is under £4 and its still cheaper than diesel up here in Scotland.
 
I've often wondered about this. Does the car constantly try to advance the timing and backs off when it knocks or is it that the 98ron fuel just has a higher calorific value and thus you get better MPG? its probably the latter since the engine wouldn't be set up to constantly cause detonation on a regular basis.
 
Dangerous Dave said:
My overall average is 32-33mpg aswell, worth trying a few tanks of 98ron or 99ron v power so the ECU can adapt before making a decision on it. The way I look at it is the difference a tank is under £4 and its still cheaper than diesel up here in Scotland.
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Also if you are getting 2mpg more for using Vpower then the difference is even less, cause you would get ~20 miles more out of a tank, which is about £3 worth of fuel.
 
My understanding is although not sure if it is correct is the car does adapt to the fuel I assume it can compare what the detonation is compared to timing and advance the timing when it thinks there is better fuel in the car, the Golf has two knock sensors for this I think. If you have vagcom the car shows the quality of fuel it thinks is in the tank can't for the life of me remember was it says but it does have a datablock for it so I assume its continually monitoring the fuel. You can also get a live readout for the knock sensors and the amount of timing its knocked back.

Evo got increased BHP right up to race fuel but were resetting the ECU and flushing a lot of fuel through the car to get it to adapt to the fuel.
 
98 is recommended on the filler cap on mine.

I have used this since new so can't compare with 95 directly, although reports suggest generally better performance & mpg.
 
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