Optimax is for girls!
Discussion
Raks said:
what are those prices !?!? i can't quite read it ??
either way - it's going to be cheaper isn't it ????
Sorry Raks, couldn't quite get the picture resolution right. This was racing fuel on sale at a drag racing meet at Santa Pod, 100-118 octane with a price of roughly 6 to 9 quid a gallon according to quantity purchased.
Balmoral Green said:
Are there any downsides to running very high octane? I have a dozen bottles of tetraboost lying around, sometimes I put it in the Turbo R when I want an extra kick. I am sure I have used far too much sometimes. Does it matter?
I would not recommend the race stuff shown above for street cars unless you remove the cats. Leaded petrol will (at best) melt your cats or (at worse) catch them on fire...
ErnestM
Thanks Ernest, but pre '92 cars in the UK dont have cats, well, only a few that had them fitted a model year or two in advance of the legislation.
Thanks for the reply Marquis, but if my mapping/knock sensors are unable to take advantage of higher octane, then whats the big deal about Optimax?
Thanks for the reply Marquis, but if my mapping/knock sensors are unable to take advantage of higher octane, then whats the big deal about Optimax?
Balmoral, some cars - with more modern engine management systems ACTUALLY GO INTO knock and then continually retard the ignition.
the base calibration of these cars would have to be done on a high octane and there would have to be a good knock system. Examples inculde alot of the Honda System, Jaguars, such as the X202s/Mk 2 S-types with their Denso injection systems- so when I say modern I mean post 1996-1997-depending on the manufacturer, not just cars with knock sensors. For example my 1987 928 S4 has knock sensors but the calibration and knock system isn't sophisticated enough to adapt and actively adjust- going INTO knock. The knock system on that car and yours also is only there as a preventitive measure.
Infact If I recall correctly I think you car has K jetronic fuel injection - I'd have to check- in which case I'm not sure it has knock sensors- it might just have a "safe base map" like a 1985 Porsche 911/930 Turbo does. I can check on this, as I work with someone who used to work at Rolls Royce.
There is no benefit in putting in a higher octane fuel in a car which was mapped to run lower octane.
>> Edited by Marquis_Rex on Tuesday 29th June 21:33
the base calibration of these cars would have to be done on a high octane and there would have to be a good knock system. Examples inculde alot of the Honda System, Jaguars, such as the X202s/Mk 2 S-types with their Denso injection systems- so when I say modern I mean post 1996-1997-depending on the manufacturer, not just cars with knock sensors. For example my 1987 928 S4 has knock sensors but the calibration and knock system isn't sophisticated enough to adapt and actively adjust- going INTO knock. The knock system on that car and yours also is only there as a preventitive measure.
Infact If I recall correctly I think you car has K jetronic fuel injection - I'd have to check- in which case I'm not sure it has knock sensors- it might just have a "safe base map" like a 1985 Porsche 911/930 Turbo does. I can check on this, as I work with someone who used to work at Rolls Royce.
There is no benefit in putting in a higher octane fuel in a car which was mapped to run lower octane.
>> Edited by Marquis_Rex on Tuesday 29th June 21:33
1982 onwards Saab Turbos ran with mild detonation, the APC would listen for it and drop boost to a level where it ceased, then increase again until a level with zero detonation was found. Strong engines known to go for a quater of a million miles plus.
So APC was mainstream in 82/83 vs 96/97 for most other kit. Like most modern automotive systems the old sweedish tanks were nearly 15 years ahead of the curve
So APC was mainstream in 82/83 vs 96/97 for most other kit. Like most modern automotive systems the old sweedish tanks were nearly 15 years ahead of the curve
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