Petrol - Do you really need Super unleaded?
06 January 2006, 08:29 PM
#1
Petrol - Do you really need Super unleaded?
Hi Folks,
Just an observation, but having driven a standard wrx for a couple of months now on optimax etc., filled up today with standard issue 95 ron unleaded (no 97 available).
I've driven the best part of 200 miles today - both m/way, A road & some twisty b-road action - & can not detect even the slightest deterioration in performance + I've saved £4 filling up.
Has anyone else had any experience of running their scoob on 95 over a longer period- is super really necessary?
Jonesy
Just an observation, but having driven a standard wrx for a couple of months now on optimax etc., filled up today with standard issue 95 ron unleaded (no 97 available).
I've driven the best part of 200 miles today - both m/way, A road & some twisty b-road action - & can not detect even the slightest deterioration in performance + I've saved £4 filling up.
Has anyone else had any experience of running their scoob on 95 over a longer period- is super really necessary?
Jonesy
06 January 2006, 08:50 PM
#4
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my bro has a civic type r and insisted on always using optimax.
With the shortage of fuel he began using normal unleaded and noticed no difference in performance.
i suppose its different in each car. Ive recently put tesco 99 ron in my 03 sti ppp and the car runs well...
With the shortage of fuel he began using normal unleaded and noticed no difference in performance.
i suppose its different in each car. Ive recently put tesco 99 ron in my 03 sti ppp and the car runs well...
06 January 2006, 09:01 PM
#5
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I think as long as you use at least super un-leaded your ok.
If you use normal unleaded you are asking for trouble. An engine builder friend who works for Cosworth did try explaining the reason why a while back, but I cant remember the details.
I should go back to 97ron at least If I was you fella.
Gary
If you use normal unleaded you are asking for trouble. An engine builder friend who works for Cosworth did try explaining the reason why a while back, but I cant remember the details.
I should go back to 97ron at least If I was you fella.
Gary
06 January 2006, 09:09 PM
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A high octane fuel has a much better resistance to detonation than a low octane one. When your engine starts to det then excessive pressure builds in the combustion chamber, the ensuing shock waves can be enough to wreck your bearings etc..
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06 January 2006, 09:46 PM
#10
I never had a problem on 95Ron (UK car, handbook reccomends 95Ron or higher on mine -NOTE: other scoobs are different depending on year, spec and county of origin - check your manual). And for day to day driving I cannot tell a blind bit of difference. Even mpg is the same.
Perhaps if I went on a rolling road I may see a few more peak horses at 6000+rpm. But seeing I rarely do 6000+rpm for any duration, there's just no point imo.
Perhaps if I went on a rolling road I may see a few more peak horses at 6000+rpm. But seeing I rarely do 6000+rpm for any duration, there's just no point imo.
06 January 2006, 10:11 PM
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I have a fuel card for the job i do the only problem is i cant put optimax on my card. I have had the car for six months now and no problems its a wrx 03 std uk car i have put optimax in and it does go better.
06 January 2006, 10:26 PM
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I would not recommend using the 95 ron stuff especially in a JDM which was set up for 100 ron. U will be at risk of detonation i.e pre ignition which WILL damage your engine over a period of time. My 03 STI PPP states 98 ron on fuel filler and it gets nothing but unless emergency when I will put no more than £5 of 97 ron in to get me home. If u have to use 95 ron would recommend Millers Octane Booster to stay safe.
06 January 2006, 11:12 PM
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As said in another post. The Subaru Specialists who look after my car (A standard WRX) clearly said that Premium unleaded in absolutely fine for my car and SUL is not necessary.
He said they use Premium unleaded in their own similar vehicles and as read elsewhere on here, somone posted that they have run WRX's to 90,000 miles on premium unleaded without problems.
He said they use Premium unleaded in their own similar vehicles and as read elsewhere on here, somone posted that they have run WRX's to 90,000 miles on premium unleaded without problems.
06 January 2006, 11:55 PM
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sorry to jump in but i have wondered this also... i have a MY00 with PPP uk turbo, am I ok to put normal unleaded in or 95 ron as yas call it or du I use super unleaded or optimax?
i honestly have no idea which is best
or more to the point if normal unleaded could cause damage to my uk car
or du I use super unleaded or optimax?i honestly have no idea which is best
or more to the point if normal unleaded could cause damage to my uk car
07 January 2006, 12:16 AM
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SUL it is then
ive not used normal unleaded so I honestly couldnt of commented on any performance differences between them or general running....
thanks for the advice m8
ive not used normal unleaded so I honestly couldnt of commented on any performance differences between them or general running....
thanks for the advice m8
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