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| # | Post Title | Result Info | Date | User | Forum |
| Answer to: Gasoline | 52Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| Yeah, usually non-performance oriented street cars don't have very high compression ratios. I'm assuming that's more of a cost thing because you need stronger piston heads and engine blocks to withstand higher compression. Air volume is equally important as well when determining octane. For example, a 2019 Mazda3 has a compression ratio of 13:1 (naturally aspirated) which uses 87 octane minimum, and my 2016 BMW has a compression ratio of 10:1 (turbocharged) which uses 91 minimum. Eventhough my engine has a lower compression ratio than the Mazda, it takes 91 ... | |||||
| Using 85 Octane gasoline | 36Relevance | 4 years ago | JPPlatt | Submit Your Question HERE | |
| I live in Colorado and our pumps have 3 grades 85, 87, and 91 octane gasoline. I have a new Toyota 4.0 liter engine. The manual says use 87 octane and the dealer recommended 87 octane. My understanding is at high altitude (5000 feet) 85 octane is ok. What does Scotty recommend? | |||||
| 85 Octane | 36Relevance | 5 years ago | Fireman_311 | Submit Your Question HERE | |
| Hi Scotty and others, I live in Utah and our base octane gasoline is 85 octane. Why is this? What is the advantage or disadvantage? Most vehicles recommend 87 octane, is there anything that would cause this octane to harm a vehicle? Thanks for your attention. | |||||
| How much boost is too much? | 34Relevance | 3 years ago | Whatchamacallit | Submit Your Question HERE | |
| There is a particular car I am interested in the 2024 Acura Integra Type S. It uses the 2.0L turbocharged 4-cylinder engine; however, it makes 320 hp with 310 lb-ft torque. It does it with 25.2 psi of boost. . Given it’s a turbocharged DI-only engine with up to 25.2 psi of boost, how much boost is too much before the longevity of the engine is effected? Is 25.2 psi boost a lot already? | |||||
| Answer to: how to increase boost slightly on a R33 Nissan Skyline? | 34Relevance | 5 years ago | Mod_Man | Submit Your Question HERE | |
| If you feel like rolling the dice and upping boost on stock internals, SBC Blitz makes a controller for the R33. I can not recommend upping boost on the stock internals, but those I know who have keep the boost under 10psi. Again, my professional opinion is not to adjust boost on a stock engine. | |||||
| Answer to: Hi Scotty I have a question to ask you please I have GMC Sierra 1500 Denali 2017 with engine 6.2 l my question is if use octane booster that add 4 extra octane and I’m already using 93 octane gas will damage the engine? | 34Relevance | 6 years ago | USAFdozerpilot | Submit Your Question HERE | |
| Is there a reason that you feel you need an extra 4 octane? | |||||
| Answer to: 85 octane fuel? | 49Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| That may be a true claim as to why they are selling 85. The higher the altitude, the air is less dense and therefore less oxygen in a given volume. The octane rating (gasoline's resistance to auto-ignition in higher pressures) coincides with the amount of oxygen your engine consumes. Turbocharged and supercharged engines use a minimum of 91/93 because more air is forced into the cylinder (more pressure). The more air you get in the cylinder, the higher the compression. You need a higher octane gas for higher compression to prevent knocking (prevent the gas f ... | |||||
| Answer to: 2011 Lexus rx350 premium gas?? | 46Relevance | 3 years ago | Hixster | Submit Your Question HERE | |
| First, I was wrong and I apologize. Secondly, your gas cap may say "Premium Fuel Required" but that's also incorrect. From the 2011 Lexus RX350 handbook page 606: "Your vehicle must use only unleaded gasoline. Premium unleaded gasoline with an octane rating of 91 (Research octane Number 96) or higher required for optimum engine performance. If 91 octane cannot be obtained, you may use unleaded gasoline with an octane rating as low as 87 (Research octane Number 91). Use of unleaded gasoline with an octane rating lower than 91 may result in engine knocking. ... | |||||
| Answer to: Distance to empty on Ford Escape 2014 | 46Relevance | 4 years ago | Benjilafouine | Submit Your Question HERE | |
| Well, this is strange. Yesterday, I filled my Focus 2003 with octane 91 (from octane 94 last week). Driving through my usual mountain ridge today, I felt that the Focus had more power with octane 91 than 94. I was already not impressed with octane 94 last week. There is a particular hill on my route that I use for testing. Simple enough: I downshift in fourth speed and set the cruise control to 100 km/h. With octane 87, it could not hold its speed by 7-8 kilometres. With the 91, it would lose only 1-2 kilometres and with octane 94, I noticed 4-5 kilomet ... | |||||
| Answer to: Distance to empty on Ford Escape 2014 | 46Relevance | 4 years ago | Justin Shepherd | Submit Your Question HERE | |
| A 2003 Ford Focus is likely new enough to detect octane ranges. The technology in computer controlled cars started coming out in the late 90s with Flex-Fuel vehicle introduction (my 1999 Ranger is a flex fuel vehicle and it detects the octane change). My 1994 BMW also detected octane changes. Owner's manual said to use premium gas for best performance. You would need to go back to the late 70s and up through probably the early 90s to genuinely find a car that can't detect octane changes. For example, my '79 Catalina is carbureted, it doesn't "know" the octa ... | |||||
| Answer to: Can I put 86 in my new Tundra | 33Relevance | 4 years ago | Whatchamacallit | Submit Your Question HERE | |
| We are talking about a difference of 1 octane (so 86 vs. 87 and not 86 versus 93 or 91) so you will probably be fine. I would use 86 and if there is no knocking continue to use it. In modern cars, the ECU should compensate for the lower octane and again we are only talking about 1 octane difference. As another example, for some performance cars in the owner’s manual state 93 octane required but some states only carry 91 octane, and yet those vehicles are sold (brand new) in those states. It turns out 91 is fine for those vehicles although there may be a ... | |||||
| RE: '06 Mazdaspeed 6 Power Loss, Sputtery feel in Acceleration | 33Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| @joshhuck All you do is fill up with 91 octane at the pump. You can mix different octane fuels, but it's best to fill up pure 91 octane. Mixing octane ratings will just average them out...so like mixing half 87 and half 91 will give a full tank of 89 octane. | |||||
| Answer to: Premium versus Regular in GS350 F sport 3.5 V6 306 HP 11.5 | 33Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| If it calls for premium gasoline (91/93 octane), I wouldn't suggest running regular gasoline (87 octane). Higher octane gasoline is important for performance engines like that. Switching to a lower octane will give you less power and may even cause knock. octane rating is not a gimmick. | |||||
| RE: Gasoline | 33Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| What you're asking makes no sense. First off, octane IS the measurement of a fuel's resistance to ignition under high pressure and heat. And higher octane fuels do have a slower flame propagation because of their resistance to ignition. THIS is why ignition timing is advanced. There's a correlation between octane and flame propagation. I hope you know what burn propagation is by the way. I just stated in my previous comments that high performance engines DO need high octane fuel to resist pre-ignition, and I also stated WHY they need higher octane fuel. You' ... | |||||
| RE: Gasoline | 46Relevance | 6 years ago | Razmig Bartassian | Submit Your Question HERE | |
| Well it depends on how your timing gets adjusted. Any engine that's controlled electronically will be able to adjust timing according to octane (or how the fuel is burning as determined by the ECU). It's one of those things where you have to experiment with different octane ratings. If your car recommends 87 octane, you can try 91/93 and see if there is a noticeable benefit. Most of the time there isn't a benefit to using a higher octane than what is recommended (it will just change ignition timing, that's all). You may notice better gas mileage and power wh ... | |||||