Discussion
I would concur with the Optimax idea.
Mine will pink quite noticeably on normal unleaded, less so on super, and even less so on Optimax. I used to think that Optimax didn't make any difference, but over the winter months a few problems really came to light and then got sorted and the quality of fuel now really makes a noticeable change.
Mine will pink quite noticeably on normal unleaded, less so on super, and even less so on Optimax. I used to think that Optimax didn't make any difference, but over the winter months a few problems really came to light and then got sorted and the quality of fuel now really makes a noticeable change.
Pinking means that you have probably filled up with low quality fuel, the quickest fix would be to retard the ignition by moving the distributor back a nads until the pinking stops.(make sure you mark the dizzy before moving it so it can be reset when you get a refill).
Hope this helps.
Hope this helps.
I would be careful mixing octane booster with a 'super' unleaded fuel.
Pump super unleaded can be boosted by Phosphorous, Potassium & Manganease (plus others).
Octane boosters also use the same sort of compunds, but I am aware that mixing the 2 compounds (potassium octane booster into a Phosphorous boosted fuel) can cause some nasty side effects...
I have done this in my hopped up (high compression ratio) FireBlade, and now I am up for a 2K rebuild....
I am still trying to find some 'authoritive' information on the use of octane boosters in the UK.....
>> Edited by bogbeast on Friday 7th June 14:28
Pump super unleaded can be boosted by Phosphorous, Potassium & Manganease (plus others).
Octane boosters also use the same sort of compunds, but I am aware that mixing the 2 compounds (potassium octane booster into a Phosphorous boosted fuel) can cause some nasty side effects...
I have done this in my hopped up (high compression ratio) FireBlade, and now I am up for a 2K rebuild....
I am still trying to find some 'authoritive' information on the use of octane boosters in the UK.....
>> Edited by bogbeast on Friday 7th June 14:28
I thought it was possible to have the car setup to run normal unleaded.
Anyone care to comment on the negative effect s of doing this.
Near me I have 2 garages which sell Optimax one is 10 miles in the wrong direction to anywhere I normally go and the other is around 6 miles away but with the Humber Bridge in the middle at £5 for a return trip toll!!
As my car is with Wedge I was thinking of having them set it up for 95 RON.
Any reason why this would be a bad thing??
Dave
Anyone care to comment on the negative effect s of doing this.
Near me I have 2 garages which sell Optimax one is 10 miles in the wrong direction to anywhere I normally go and the other is around 6 miles away but with the Humber Bridge in the middle at £5 for a return trip toll!!
As my car is with Wedge I was thinking of having them set it up for 95 RON.
Any reason why this would be a bad thing??
Dave
How much less power/torque on a Griff 500?
There was a rumour in my MX5 days that advancing ignition from 10 degrees to 14 degrees made more power but it could never be proved on a rolling road and eventually was dismissed as an old wives tale
(It did of course cause detonation unless running on good fuel).
In a similar fashion I'm guessing that retarding the ignition and the power losses here would be negligable for road use and the benefits quite good (eg. petrol obtainable from any reputable garage and at least 30p a gallon cheaper too - around 7p a litre)?
Of course being a newby this could be a huge generalisation
Anyone know for sure?
Dave
There was a rumour in my MX5 days that advancing ignition from 10 degrees to 14 degrees made more power but it could never be proved on a rolling road and eventually was dismissed as an old wives tale
(It did of course cause detonation unless running on good fuel). In a similar fashion I'm guessing that retarding the ignition and the power losses here would be negligable for road use and the benefits quite good (eg. petrol obtainable from any reputable garage and at least 30p a gallon cheaper too - around 7p a litre)?
Of course being a newby this could be a huge generalisation
Anyone know for sure?
Dave
quote:
A reply from UP NORTH
This isnt Alaska ya know
Optimax has been out here for ages
Only difference up here is there are still some roads where you can exceed 20mph!
Ok, Ok!! As an exiled native up-northerner (even more up north than you - Newcastle) I don't go in for any of that north of Watford stuff either! Just haven't been back there since I got the Chim which prefers super u/l. Also going by the Shell web site which reckons "Starting in the South of England and working our way up the country, we plan to reach Scotland by June. By the end of July Shell Optimax will be on sale at most of our service stations, including sites in Scotland, the North East and South West of England and South Wales. " If it's there already - groovy. Should have started off there. Cadburys always used to trial their new chocolates there when I were a lass, Wispa, Twirl, all those....
See ya on Sunday....!
Alex.
quote:
Less power.
Bit of a myth this one. The main problem is that 95 octane can induce pinkling/pre-detonation which does reduce power but it is like running the engine out of tune. Get the engine adjusted and there is no noticeable difference.
My Griff runs on U/L and only gets 97/98 as a treat. produces 300 bhp on the dyno with plain stuff. Changing to 98 did absolutely nothing except increase the fuel costs. Did require a Mark Adarms rolling road session to get it right though as it may not simply be a bit of distributor twiddling.
Steve
www.tvrbooks.co.uk
'My Griff runs on U/L and only gets 97/98 as a treat. produces 300 bhp on the dyno with plain stuff. Changing to 98 did absolutely nothing except increase the fuel costs.'
Phew - that's music to my eyes. I always feed my 500 on Unleaded and it seems to work fine. On the odd occasions when I think I might give it a treat with some fillet steak Super Unleaded, I look at the price, think 'bloody hell!' and put the usual fodder back in. I might try Optimax one day but I never seem to be going past a Shell garage when I need fuel.
Phew - that's music to my eyes. I always feed my 500 on Unleaded and it seems to work fine. On the odd occasions when I think I might give it a treat with some fillet steak Super Unleaded, I look at the price, think 'bloody hell!' and put the usual fodder back in. I might try Optimax one day but I never seem to be going past a Shell garage when I need fuel.
I did not have a Mark trick on my griff 500 but had a rolling road and they simply twiddled the timing just before it pinked to gain a few bhp. Steve, i think you should also say you have a few other mods, induction, cam i believe! Something iam thinking of, it must be worth it.
>> Edited by david beer on Saturday 8th June 19:03
>> Edited by david beer on Saturday 8th June 19:03
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