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Author Petrol
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 14:20   View User's Profile U2U Member Reply With Quote

When i first got my corsa 1.2 16v i noticed that if i floored the accelerator from a standstill it would sometimes loose all power at certain rpms.

I have used optimax unleaded (98ron) for 3 tankfulls and this hasn't occured.

Yesterday i was forced to use super unleaded 97 ron, and i got the effect again!
Noonster
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Registered: 20th Jul 03
Location: East Yorkshire
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11th Sep 03 at 14:26   View User's Profile U2U Member Reply With Quote

- that tell you something then.
R Lee
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Registered: 15th Aug 03
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11th Sep 03 at 14:26   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by MikeH
When i first got my corsa 1.2 16v i noticed that if i floored the accelerator from a standstill it would sometimes loose all power at certain rpms.

I have used optimax unleaded (98ron) for 3 tankfulls and this hasn't occured.

Yesterday i was forced to use super unleaded 97 ron, and i got the effect again!


i find using optimax to smooth the running of my car by loads...
keep using it
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 14:29   View User's Profile U2U Member Reply With Quote

I'm wondering if with anything below 98 ron the car is pinking and the noc sensor is screwing the power up.

It only happenes if i accelerate hard, which your average granny driving a ocrsa wouldn't do with 95 ron fuel in.
Noonster
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Registered: 20th Jul 03
Location: East Yorkshire
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11th Sep 03 at 14:29   View User's Profile U2U Member Reply With Quote

What petrol stations sell Optimax and how much 75.9??
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 14:30   View User's Profile U2U Member Reply With Quote

Shell sell it, don't know the price off hand.
Noonster
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Registered: 20th Jul 03
Location: East Yorkshire
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11th Sep 03 at 14:32   View User's Profile U2U Member Reply With Quote

shell ..... not one near me all I have is Esso and Total.
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 14:33   View User's Profile U2U Member Reply With Quote

I've heard BP are bringing out 100 ron fuel soon.

But this might be overkill and i don't know whether the corsa ECU has been designed for it.
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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11th Sep 03 at 14:39   View User's Profile U2U Member Reply With Quote

thats good, we dont have BP here, and Shell dont do Optimax

have to settle for Super Unleaded meself
R Lee
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Registered: 15th Aug 03
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11th Sep 03 at 14:41   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by MikeH
I've heard BP are bringing out 100 ron fuel soon.

But this might be overkill and i don't know whether the corsa ECU has been designed for it.


who cares lol
lets use the stuff!
anything to unleash the mighty power of my 1.2 16v
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 14:44   View User's Profile U2U Member Reply With Quote

I'm not saying righter octane fuel gives better power!

I'm saying it seems to cure the strange problem i used to have, which resulted in a loss of power.

Higher octane only gives more power if it enables you to increase the compression ratio of your engine.... which isn't the case on a 1.2 16v.
R Lee
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Registered: 15th Aug 03
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11th Sep 03 at 14:45   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by MikeH
I'm not saying righter octane fuel gives better power!

I'm saying it seems to cure the strange problem i used to have, which resulted in a loss of power.

Higher octane only gives more power if it enables you to increase the compression ratio of your engine.... which isn't the case on a 1.2 16v.


i aint no mechanic so i dont understand this compression jibby jobby...
anyway if optimax works for you, use it
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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11th Sep 03 at 14:49   View User's Profile U2U Member Reply With Quote

right here we go, most european engines are developed using 98RON petrol, so therefore the engine runs at maxmium efficeny on the 98RON, if you put lower RON rating in then the engine retards the timing to copensate for the shitter petrol

think of it as running yourself on Water & Lucozade Sport

Water will get you there in the end
Lucozade will get you there quicker but will cost you more

comprende?

NB, jap engines are developed using 99-100RON thats why they need octane booster etc

[Edited on 11-09-2003 by Gambit]
R Lee
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Registered: 15th Aug 03
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11th Sep 03 at 14:51   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Gambit
right here we go, most engines are developed using 98RON petrol, so therefore the engine runs at maxmium efficeny on the 98RON, if you put lower RON rating in then the engine retards the timing to copensate for the shitter petrol

think of it as running yourself on Water & Lucozade Sport

Water will get you there in the end
Lucozade will get you there quicker but will cost you more

comprende?


erm..... yeah.. uh huh.. yep...

yeah i do really
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 14:56   View User's Profile U2U Member Reply With Quote

gambit: if the engine has been designed for 98 ron then why do vauxhall tell you to use 95 ron in it?
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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11th Sep 03 at 14:59   View User's Profile U2U Member Reply With Quote

if you bought a 1L corsa and they told you to run it on super unleaded, would you be happy?
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 14:59   View User's Profile U2U Member Reply With Quote

haha
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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11th Sep 03 at 15:01   View User's Profile U2U Member Reply With Quote

seriously though, why do u think they have the knock sensor on them
si_reading
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Registered: 5th Apr 03
Location: Macclesfield, Cheshire
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11th Sep 03 at 15:05   View User's Profile U2U Member Reply With Quote

I've been running mine on Optimax over the summer while not been doing much millage, but back to cheap stuff in a couple of weeks when have to drive into Manchester everyday when go back to uni!
I think Optimax has made it run smoother than normal shell unleaded fuel.
R Lee
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Registered: 15th Aug 03
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11th Sep 03 at 15:06   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Gambit
seriously though, why do u think they have the knock sensor on them


have no idea about mechanical stuff knock sensor?????? wassat then?
MikeH
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Registered: 3rd Apr 03
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11th Sep 03 at 15:13   View User's Profile U2U Member Reply With Quote

As i understand it the knock sensor detects 'pre-ignition' which can be caused by the fuel being too lean (not enough of in makes it explosive) in the air. Or because the fuel isn't high enough octane (low octane self combusts at lower pressures) pressures.

So the knock sensor detects this about to happen and stop the damage to your engine by adjusting the ignition timing.
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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11th Sep 03 at 15:14   View User's Profile U2U Member Reply With Quote

the thing that tell the ECU to retard the timing because of the shitter petrol
Gambit
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Registered: 5th Jun 00
Location: Common Sense HQ
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11th Sep 03 at 15:16   View User's Profile U2U Member Reply With Quote

basically it senses engine knock which is basically just vibration caused by pre-ignition!
R Lee
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Registered: 15th Aug 03
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11th Sep 03 at 15:16   View User's Profile U2U Member Reply With Quote

i get yer
corsa-sxi
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Registered: 11th Jul 03
Location: Kingston upon Hull
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11th Sep 03 at 16:12   View User's Profile U2U Member Reply With Quote

normal unleaded i pay 73.9 last week, now 74.9 optimax was 78.9..so i didnt really bother.....btw is there any diff using morrisons, adsa or safeway fuel?

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