Optimax or 97 in 4.2
Discussion
oliverkelly said:Same here.
I have always found optimax is the best in my 4.2.
Go create some weather...
Graham
TCR The Cerbera Register
www.TVR-Cerbera.com
any idea why?mine says to run on 95 which I did whilst on holiday in Portugal. Began to sound like a bag of nails and I thought it needed a good service. Got back to the UK and filled up with Optimax, unbelievable, immediate difference and most of the pinking disappeared. Will only use this in future.
It is 97 for early 4.2's (or possibly even 98) but 95 from then on i.e. most 4.5's and later 4.2's.
Confusingly mine had a sticker saying don't use less than 98 ron (it was a '98 4.2) but I think that was because they were trying to use up the old stickers
Preferable to use 97+ ron.
Not sure if optimax is really that much better. It certainly has plenty of cleaning agents in and has a higher octane rating than other fuels but not necessarily the highest calorific value.
Sorry, this is getting really boring, if you want to know more check some of the jap forums, there are some good threads there (because octane rating can become critical when you start tuning cars).
Rob.
Confusingly mine had a sticker saying don't use less than 98 ron (it was a '98 4.2) but I think that was because they were trying to use up the old stickers
Preferable to use 97+ ron.
Not sure if optimax is really that much better. It certainly has plenty of cleaning agents in and has a higher octane rating than other fuels but not necessarily the highest calorific value.
Sorry, this is getting really boring, if you want to know more check some of the jap forums, there are some good threads there (because octane rating can become critical when you start tuning cars).
Rob.
yiw1393 said:
It's rumoured that VPower will be coming to the UK next Tuesday.
What is this Vpower? Which brand? Anyone used it?
It's Shell. You can currently get it on the continent (and other places like Asia). Seem to remember it being 100RON in Germany, but could well be wrong. Would be interested to know of any TVR owners that've tried it, too.
Singapore version (lower octane, possibly?)...
www.shell.com/home/Framework?siteId=sg-en&FC1=&FC2=&FC4=&FC5=&FC3=/sg-en/html/iwgen/shell_for_motorists/fuels/vpower/faqvpower_01211900.html
OK, so now Im realy confused......
Ran my 4.0 chim on Optimax always and found it to be far better. Had the Cerb for 5 months now and until today have used the very same Optimax in this.
I recently noticed that I had a slight pink at 2.5K revs when accelerating so I got the throttle pots checked out and all was fine (along with a major service)
I put super (97) in it today and agree with the extra pops and bangs but strangely, the pinking has completley gone.
The car is apparently mapped for 98 so one would think that Optimax would be the best choice, so far is seems not. However, is the ECU not capable of adaptive mapping and would this "learning" apply to adapting to different fuels as well? and if this is true, why do the lightweigt cars have a 95 and 98 octane switch to select each different fuel type?
There is a post in general gassing for a 106 octane rated racing fuel. What happens if I feed the Cerb this stuff?????? more pinking?
And another thing, I know I have lambda sensors, but is there a knock sensor???? and if not, how would the ECU adjust to different fuels anyway?
And........ and....
Oh I dont care anyway. It would still fly with a tank full of Tequila!
(dont we all eh)
Ran my 4.0 chim on Optimax always and found it to be far better. Had the Cerb for 5 months now and until today have used the very same Optimax in this.
I recently noticed that I had a slight pink at 2.5K revs when accelerating so I got the throttle pots checked out and all was fine (along with a major service)
I put super (97) in it today and agree with the extra pops and bangs but strangely, the pinking has completley gone.
The car is apparently mapped for 98 so one would think that Optimax would be the best choice, so far is seems not. However, is the ECU not capable of adaptive mapping and would this "learning" apply to adapting to different fuels as well? and if this is true, why do the lightweigt cars have a 95 and 98 octane switch to select each different fuel type?
There is a post in general gassing for a 106 octane rated racing fuel. What happens if I feed the Cerb this stuff?????? more pinking?
And another thing, I know I have lambda sensors, but is there a knock sensor???? and if not, how would the ECU adjust to different fuels anyway?
And........ and....
Oh I dont care anyway. It would still fly with a tank full of Tequila!
(dont we all eh
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