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Old 03 October 2008, 19:14   #11
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Country: UK - Scotland
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Originally Posted by Locozodiac View Post
to compare will need to have 2 tanks available, one with 90, other with 95, get a gps and on very calm waters full throttle same given distances with both gasolines to compare: same or better performance.
yes but bear in mind the benefit might be fuel ecconomy, or acceleration which won't show up so clearly on the GPS
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Old 03 October 2008, 19:32   #12
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One of the things he did tell me to stay clear off was the supermarket fuel as it has to much sulphur in it and tends to go off quicker especially in deck tanks.
J
Id agree generally- but Tescos super unleaded is the 2nd best out there as far as tuning is concerned-the best is Shell's V Power. When ive been remapping ecu's on cars you can run a lot more ign advance with these fuels without any detonation occouring compared to any other "super" unleaded.
But as said before, you dont gain any performance on a std engine unless it has the ign timing altered and fuel leaned out to make use of the higher octain. Not all cars are mapped to run on low octain, I used to have a BMW M3 that stated in the manual that it should be filled with a minimum of 97 ron fuel(super unleaded).Jap import cars are also mapped for high octain.
As far as 2 stroke's are concerned(never tuned them for high output), im not sure whats best to do with the ignition as ive read in some cases its better to lower the advance(skimmed heads/high compression), and others to raise the advance.

Locozodiac-fill up with a tank of the good stuff and advance your ign a couple of degrees(easy to to on your Tohatsu's), lean the mixture out a bit(keep an eye on your plug colours) and you should get a crisper throttle response and gain a bit of power + gain a bit of fuel economy while you're at it!!
Just dont lean it out too far - again, keep checking the plug colours are OK.
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Old 04 October 2008, 09:53   #13
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Originally Posted by jambo View Post
One of the things he did tell me to stay clear off was the supermarket fuel as it has to much sulphur in it and tends to go off quicker especially in deck tanks.
J

Believe that and you will believe anything - there are only a small handfull of refineries in the UK and the fuel can come from any of them. There are strict EU rules on fuel and it is all the same stuff excluding certain "special brews"!!!
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Old 05 October 2008, 10:34   #14
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Originally Posted by Easyrider View Post
Locozodiac-fill up with a tank of the good stuff and advance your ign a couple of degrees(easy to to on your Tohatsu's), lean the mixture out a bit(keep an eye on your plug colours) and you should get a crisper throttle response and gain a bit of power + gain a bit of fuel economy while you're at it!!
Just dont lean it out too far - again, keep checking the plug colours are OK.
Thanks for the imput, but all my Tohatsu's are running great with 95 octane, nice starts, acceleration, etc, and still factory adjusted. One issue that don't get clear, personally don't like to play with engine settings if engines are working ok, if need to, with a vernier measure all distances, gaps, etc and take a close-up photo on area before re adjusting, so in case need to put back as was before will do so with no prob.

Was the air gas mixture screw supposed to be just for idle (ralenti) speed adjustment only, as having un adjustable fixed air/gas inside jets according to manuals. Or this mixture screw works also when at any speed different from idle ? Any ideas.

The issue of taking the plugs out to see a brown like color, must be done after a full wot for some time, that is stop engine/take plugs out to check ? What moment would be the correct procedure to check this out ?

Happy Boating
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