| Author | Message | ||
     Adoogie3 |
I put some 110 octane in her and it smoothed her out alot.Ran better and I noticed that my estimate mpg went up right away.usually at 32 34 it went to 36 Ive never seen it go that high.Thats with me getting on it to.Is 110 bad to use in this beast.It has lead additives.They sell a 100 version with no lead too .At 12.3 to 1 ratio on the motor you would think it would help?Any others use high octane? | ||
| Xb9 |
Smoother her out for now. That will change. The lead will kill the O2 sensors fairly quickly. Should only use unleaded. The combustion chamber is designed to burn 91 Octane or better (in the manual). | ||
| Andrewisu |
Here in Iowa it can be difficult for me to find a high octane fuel in small towns. If I can't find regular 91 octane I have the option of regular 87 or 89 with %10 ethanol. Which would be better? I know gas mileage will decrease with ethanol but is the extra octane worth it? | ||
| Slypiranna |
Lowest octane that can be controllable within the combustion cycle will yield more power and better mileage than that of a higher octane rating. There are, however, many variables that play into this equation...far off the scope here to fully digest. With that said, your best bet is to stay with pump hi octane fuel...as listed in your owners manual. And if you did manage to fill your tank with true leaded fuel, plan on a trip to the dealership for O2 sensors in the near future...they hate that stuff. Plan on paying for them too as I doubt this thread will be a warranty issue. Good luck | ||
| No_rice |
hey andrew, i usually run 89 if i have to. but then i dont usually fill it up and try to find some better the next stop. although in the spring and fall i dont worry so much. the hotter it gets and the harder you ride it the more you need the octane to help prevent detonation. otherwise i have found a few places around here that run 93. | ||
| Kravfighter |
I run the 89 when its cooler out, and 92 when its hot, no rhyme or reason, I just do it that way | ||
| Cutty72 |
91/92 all the time unless I can't get it. never put in less than 89, and it didn't like that. | ||
| Bdutro |
With only a 0.10-0.15 per gallon difference between midgrade and premium, it was only ~8% back when fuel was cheap. Now that we're all in the $4.00/gallon boat together. ($4.32 in nor-Cal today) You're looking at barely 3% increase in cost to run factory spec fuel. Has anyone ordered a barrel of VP fuel to try out? I would guess that the energy/volume and additive packages are the reason for the economy boost, not the octane. (Does the 1125's ECU contain a knock sensor or spark retard function?) | ||
| Doerman |
91 Octane, always. Yesterday I filled her up. I was on reserve and the total on the pump was $23.75. Now, I think that's pretty special! | ||
| Eddie |
If you want to use a fuel additive try Lucus fuel additive.. it is not an octane boost and does not contain lead. It will not effect the sensor and will help with millage and performance. It cost between 12 to 15 bucks for a 32oz bottle. You only need 1/2 an ounce per tank. | ||
| Rick914 |
Does anybody know the retard and advance timing threshold in the factory tuning program. It got me thinking of what the highest octane you could run with a 12.3:1 motor and if you could deck the heads some and raise the comp ratio for racing and get a few extra ponies. Just a thought out loud. Rick | ||
| Slypiranna |
This link should answer many questions... } | ||
| Slypiranna |
www.osbornauto.com/racing/dragster.htm | ||
| Slypiranna |
While the above link is a little different than what we are dealing with concerning a modern 4 valve aluminum headed rotax...the basics should prove useful. Modern 4 valve combustion chambers can tolerate 13:1 on pump 93 if the bore to stroke ratio, among many other variables...are married correctly. 5 valve heads by comparision...yamahas of the past, require major ignition lead for proper combustion...and therefor exhibit negative torque loses by comparison...at many load points...that is why they are now gone. 2 and 3 valvers have their place but herein, they are not useful for comparison. This is all relative to a naturally aspirated engine...above atmosphere and or nos and or alternate fuels...is a whole different topic with many branches! This is literally, scratching the surface of factual engine design/octane required per CR...there simple is too many variables to take into consideration. | ||
| Rick914 |
The reason I asked is I have Sunoco GT250 140oct for my VW Turbo drag, and was going to throw some in but I didn't know if it would be able to take full advantage of it. My curiosity got the better of me today, I was on reserve and filled it up with the 104. Throttle response if much better has alittle more take off through the gears too. I got to 155 today for the 1st time and didnt know it, till i got ready to exit the highway =P I did have trouble restaring it after riding hard for about 45min. Let it sit outside BestBuy for about 20mins. All in all, it runs better, I have 3 drums that I bought at $6.5gal, so I might just blend for those fun weekends. Not really worth the extra $$$ for everyday though. would still like some info on the ECU system and it's parameters if anybody has a site they know of. |
