| Author | Message | ||
     Matthew Daggett (Mldaggett) New Member Username: Mldaggett Post Number: 2 Registered: 11-2003 |
Does anyone know any tricks that make a Disco II run well on 87 octane fuels. | ||
| Justin Kurosaki (Kurosaki) Member Username: Kurosaki Post Number: 50 Registered: 02-2004 |
Matt, 1) Motor swap 2) lower compression 3) retard the ignition #2 and #3 will result in a horrible loss in HP. In short, very little can be done. Some people report 87 runs ok in their truck, but mine and everyone I've seen doesn't. -justin | ||
| b d e (Chrisseries1) Member Username: Chrisseries1 Post Number: 92 Registered: 03-2004 |
running low test will result in carbon build up. and premature valve wear. but this is hear say and personally i run high test fuel! personal preferances i guess! | ||
| Dave Smith (Javelinadave) Member Username: Javelinadave Post Number: 96 Registered: 07-2002 |
Live with it and pony up for the "good stuff"! | ||
| Marco A Mendoza (Kkngtgr) Member Username: Kkngtgr Post Number: 68 Registered: 10-2003 |
How about those people saying that using too high octane will ruin the engine?, that 93 is too much for the engine or stuff like that? whats the truth?, Personally I love using 94 (when I can find a Sunoco gas Station, but lately I have been using 93 and 89,(diference beetwin 89 and 93 is noticed) -Marco | ||
| peppy (Chrisseries1) Member Username: Chrisseries1 Post Number: 97 Registered: 03-2004 |
from what i have been told, the engine magment sytem looks after all. it should automatically adjust to what it needs.? not 100 % on this though. any takers ? | ||
| Justin Kurosaki (Kurosaki) Member Username: Kurosaki Post Number: 52 Registered: 02-2004 |
peppy, Most modern engines have spark knock sensors along with a closed loop engine control system (when not at WOT). The engine detects spark knock which is typically caused by high load conditions and retards the ignition until the condition goes away (to a pre-set limit). A higher octane will be more resistant to knock. This is where the engine "adjusts" itself to the octane. I haven't heard of any other engine management system that can detect octane (the rest is myth). Now here are the problems: 1) Not all vehicles have spark knock sensors. If they don't, then you're SOL. You CANNOT always hear knock. 2) The spark retardation is only to a pre-set amount from the factory. Each manufacture tunes this amount to the specific engine and purpose. The problems lies in the fact that the engine can only pull but so much spark out. If the knock continues then it will not retard the ignition any further and you will continue to have knock. Now this is all general info in regards to engines. I don't know if Discos utilize knock sensors, but I do know that most new vehicles do. This allows cars to be more tolerant to lower octanes and boosts performance. Now as far as the difference between the different octane numbers go, it is purely in the knock resitance (in laymen's terms). Yes, most fuel companies put different levels of cleaners/additives in their "supreme" fuels, but this has nothing to do with their octane ratings and more due to marketing. -justin | ||
| Matthew Daggett (Mldaggett) New Member Username: Mldaggett Post Number: 3 Registered: 11-2003 |
Thanks for the input. Put 89 Octane in my rig the other day, the drop in mileage and performance was amazing. |
