whitter45
Member
Registered: 15th Nov 02
Location: Norton
User status: Offline
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Anyone used it
Been using optimax (98RON) since having the car but heard good reviews about Tesco 99 RON and its cheaper than optimax
[Edited on 02-02-2006 by whitter45]
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Russ
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Registered: 14th Mar 04
Location: Armchair
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i keep trying to never got none.
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whitter45
Member
Registered: 15th Nov 02
Location: Norton
User status: Offline
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I filled up last night but will take a few tanks I would imagine for the timing to adjust
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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quote:
Originally posted by whitter45
I filled up last night but will take a few tanks I would imagine for the timing to adjust
timing will adjust straight away. what engine do you have?
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
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i used it engine pinked a little with it so went back to optiplop
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
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god it weould be great ot have the choice... can only get 95ron over here
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Cybermonkey
Member
Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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i use 101RON in the yota, Optimax Extreme. 650km's to a tank, and amazing difference it makes to the engine. 5% Ethanol
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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there is talk of optimax being replaced with 100RON fuel.... i hope so, and hope the price stays the same
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Siberia
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Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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its a pain in the bum bum cos if you import a car from japland oer here it has to go straight to be mapped for 95 which = more money...
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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I use Optimax with 90ml of NF octane booster - Takes it to about 101RON.
Fuel wont increase the performance of your car unless your ECU is clever enough to advance/retard the ignition as necessary. RON rating is just the fuels ability to resist detonation.
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whitter45
Member
Registered: 15th Nov 02
Location: Norton
User status: Offline
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Have the 1.8 T VAG 225 BHP with a remap on the way so hpefully should make a bit of difference
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Cybermonkey
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Registered: 22nd Sep 02
Location: Sydney, Australia
User status: Offline
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quote:
Originally posted by Stu
I use Optimax with 90ml of NF octane booster - Takes it to about 101RON.
Fuel wont increase the performance of your car unless your ECU is clever enough to advance/retard the ignition as necessary. RON rating is just the fuels ability to resist detonation.
it would HAVE to advance/retard the timing to create a sufficiently clean burn in the engine, advancing the timing has benefits of improving performance in the right applications. i feel greater performance running Extreme than i would running 91 or 95RON. the car is also much much smoother on kickdown
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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quote:
Originally posted by whitter45
Have the 1.8 T VAG 225 BHP with a remap on the way so hpefully should make a bit of difference
Even if it doesnt improve your performance its worth using especially on a turbocharged car. As the air is compressed by the turbo it gets hot, add that to the fact the turbo is running at 600 degrees + the intake temps can get seriously high if the cooling system isnt brilliant (such as Subarus/pulsars/200sx's etc) This hot air is sometimes hot enough to make the fuel ignite before the spark and before the piston reaches TDC (top dead centre) - detonation/pre ignition. So the piston is on its way up and your fuel has just ignited which is trying to push it back down - this can lead to holed pistons, spun big end shells, bent crank etc etc. the higher the RON rating of the fuel, the better it can withstand detonating (in this case being ignited by the hot charge air!)
Stu 
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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stu, i always thought pinking (preignition) damaged the outside edges of the piston first??
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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quote:
Originally posted by broster
stu, i always thought pinking (preignition) damaged the outside edges of the piston first??
All depends on the flame front that is created and the severity of the detonation. In the STI 5/ P1 engines when det is occurring the pistons can usually cope with it but the downward force of the det actually damages the big end shells! 
But yeah, light detonation - the kind that isnt instant and catastrophic does nibble away at the edges as you say.
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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It will probably bore most people to tears but if you want a good read about detonation/pinking/pre ignition and the effects:
http://www.streetrodstuff.com/Articles/Engine/Detonation/index.php
Absolutely top article and really easy to understand!
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whitter45
Member
Registered: 15th Nov 02
Location: Norton
User status: Offline
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I would assume 99 RON is same though as its retailed nationally
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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pinking is a nast nasty nasty thing.....
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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There is no worse noise than det crackle........sound like someone crinkling a foil crisp packet. By the time you have heard it with bare ears then youve more than likely done some damage.
Got it bad once in a mates 200sx we were mapping  luckily due to strength of the SR20DET we didnt do no harm.
Stu
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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quote:
Originally posted by Stu
Even if it doesnt improve your performance its worth using especially on a turbocharged car. As the air is compressed by the turbo it gets hot, add that to the fact the turbo is running at 600 degrees + the intake temps can get seriously high if the cooling system isnt brilliant (such as Subarus/pulsars/200sx's etc) This hot air is sometimes hot enough to make the fuel ignite before the spark and before the piston reaches TDC (top dead centre) - detonation/pre ignition. So the piston is on its way up and your fuel has just ignited which is trying to push it back down - this can lead to holed pistons, spun big end shells, bent crank etc etc. the higher the RON rating of the fuel, the better it can withstand detonating (in this case being ignited by the hot charge air!)
Stu
how imformative.... you have just explained DET to me
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broster
Premium Member
Registered: 6th Dec 02
Location: Drives: E39
User status: Offline
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quote:
Originally posted by Stu
There is no worse noise than det crackle........sound like someone crinkling a foil crisp packet. By the time you have heard it with bare ears then youve more than likely done some damage.
Got it bad once in a mates 200sx we were mapping luckily due to strength of the SR20DET we didnt do no harm.
Stu
i had it in mine also, however i dont feel it did damage...... (fingers crossed)
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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think i better buy a timing light and sett my 200sx's timing right 
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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quote:
Originally posted by Siberia
think i better buy a timing light and sett my 200sx's timing right
Have you got a 200 Siberia? What model?
I loved mine, one of the best cars I have had, it just tried to kill me one too many times tho!
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Siberia
Member
Registered: 9th Oct 03
Location: Leprechaun Land Drives : Zafira GSI
User status: Offline
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have 2 bith s13' ca18's... one is gettign broken as the body is completely fecked on it... the engine out of it is going into the other one this weekend actually.... the good one only cost me 600quid... so cheap thrills
i was going to save some cash and get a s14a but i got impatient
[Edited on 02-02-2006 by Siberia]
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Stu
Member
Registered: 3rd May 00
Location: Madchester UK Drives: 2014 BMW M135i
User status: Offline
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Sweet, proper drift weapons!!!!!
I had an S14a and it was awesome, loved that car!
Stu
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