95 ron ok to use in 99 ron mapped car?
#1
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95 ron ok to use in 99 ron mapped car?
Hey guys, my blob sti has been mapped on Shell Vpower super unleaded 99 ron fuel and is pumping out 350 ish bhp.
After the recent fuel shortages i have had to resort to putting in some normal unleaded 95 ron from various differnt garages because there has been no super unleaded available.
Is this likely to damage the engine in any way? Or cause any problems?
The car feels and pulls exactly the same to be honest, cant notice any lack in power.
Cheers
After the recent fuel shortages i have had to resort to putting in some normal unleaded 95 ron from various differnt garages because there has been no super unleaded available.
Is this likely to damage the engine in any way? Or cause any problems?
The car feels and pulls exactly the same to be honest, cant notice any lack in power.
Cheers
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As per the advice above ,it may be worth resetting the ecu also imho,as the engine ecu reacts to the lower quality fuel & retards the timing and reduces maximum boost from the turbo.In time the ecu should unlearn these setting once 97/99 octane fuel is used once more.Just drive off boost for now until tank is near empty then fill up with shell/tesco99
Last edited by midnight; 03 April 2012 at 12:46 AM.
#19
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One thing to remember that Bob Rawle told me... it will take 3 tanks of the good stuff to dilute and get rid of the crap stuff. Bare that in mind when you get back onto the good stuff before giving it beans. That's why this weekend gone, I made a day out of getting Vpower from 30 miles away as I couldn't bare 4 tanks worth of trying to drive off boost on a TD04.
#20
Toluene is your answer.
If you have a 60 litre tank and its full - siphon off 12 litres and replace with Toluene .
This will give you 100 octane fuel.
x= quantity of Toulene 120 RON
60-x = quantity of fuel 95 RON
(60-x)95/60 + 120x/60 = 100
x = 12 litres.
If you have a 60 litre tank and its full - siphon off 12 litres and replace with Toluene .
This will give you 100 octane fuel.
x= quantity of Toulene 120 RON
60-x = quantity of fuel 95 RON
(60-x)95/60 + 120x/60 = 100
x = 12 litres.
#22
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Unfortunatly it doesnt just have a high ron it will effect the fuelling as it has a different stoich point so will run leaner. Still therefore wont match what it was mapped for. Therefore better to drive it gentle and keep off boost until it has a decent tank of fuel in it.
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We've ran out of super unleaded in cheltenham too! The garages say there prioritising the crap stuff! I was like what about me! So had to put the crap stuff in. After reading this I don't want to drive
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Sometimes you don't have much of an option. Take my mate Jeff (Alcazar) for example. Has a 98uk car with a link ECU mapped for Vpower. Sometimes uses it for runs to hos French house, middle of nowhere. Petrol never mind super is hard to come by at time. Some of the octane booster in a tank is sufficient to make his car safe even on boost. Bulk buy and it isn't too expensive. Can't have two maps on his ECU which is a shame.
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Have decided to buy a bottle of this:
http://www.halfords.com/webapp/wcs/s...egoryId_255221
or maybe some of this:
http://www.halfords.com/webapp/wcs/s...Id_255221#tab1
You guys are all making me so paranoid i just want to be on the safe side!
I did however read a very interesting article about adding toluene...
http://elektro.com/~audi/audi/toluene.html
http://www.halfords.com/webapp/wcs/s...egoryId_255221
or maybe some of this:
http://www.halfords.com/webapp/wcs/s...Id_255221#tab1
You guys are all making me so paranoid i just want to be on the safe side!
I did however read a very interesting article about adding toluene...
http://elektro.com/~audi/audi/toluene.html