I wish we had Chevron in our area. Techron may be the greatest product invented for motors till Valvoline Protect and Restore...my 4C has gone from eating 1+qt oil per track day to ZERO burn the last 2....unstuck a ring!!!!
Fuel - Premium only?
- Thread starter ET2041
- Start date
Glad this topic provided some learning, some amusement, and hopefully no resentment. Hell if you want to run Graves, go for it.
Most Top Tier gas use the same additive, PEA (polyetheramine). Techron is just a commercial name for PEA, originally invented by Chevron. The blend may vary slightly from brand to brand, but PEA is the fundamental part of the formula.
And you can always buy and add Techron Complete Fuel Treatment and add it to your gas tank every few thousand miles for a deeper cleaning.
Did it for years till the FDI era. Kept getting different answers as to its use in DI motors. Always had thought its forte was injectors.....Costco always had a great deal on it!!! Only additive I ever used.
DI injectors are even more susceptible to deposits than port injectors. The holes are very small and must be kept clean for proper atomization of the fuel.
Why? You can purchase Techron additive at most auto parts stores....
No kidding..at triple the cost....I had stopped using it on my DI motors because on more than 1 it threw a CEL, and at about the same time, I started hearing about this very thing. May have just been the bolus approach was not appreciated by the O2 sensors. In retrospect, this is why I loved Chevron gas. A proper dilution rate of the PEA every time. Guess I will try it again.
From how I understood, it’s about compression, so elevation will also play a big part. For instance in Wyoming elevations are consistently much higher and the regular os 85 instead of 87. Considering the 4cyc is a turbo it is recommended for better engine tuning and performance to run an octane that is capable of burning under a higher stress. Which is why you get better MPG on longer trips with 91/93. The fuel burns differently at a higher compression. I had a twin turbo Infiniti and it drank premium. I would usually run low octane fuel anyway tho if I was just putting around town. It didn’t seem care too much. But on a highway run or long trip I was getting 50-100 miles extra per tank with 91/93.. I also experienced new pinging type noises on that engine after using 87 for long periods of time that usually cleaned up when I ran some seafoam thru it and stuck to premium. What those were I dunno and honestly it could have just been coincidence i didn’t keep experimenting and that engine was pushing 100k. These are just my two cents. My own personal conclusion is I just stick to premium. I have the 2024 first edition and I like it and I’ve found the money I save is negligent. Especially if it does end up creating to much carbon or compression issues.
Altitude has almost no effect on forced induction engines.
Attachments
Literally the whole state of Wyoming and colorado run lower octane fuels because of it. 
No effect the driver would notice
Welcome to the asylum.
Another one falls for AI slop….
Boost from a turbo is largely determined by output back pressure not input pressure. With lower air pressure turbo will spin faster to reach about the same output pressure. So modern electronically controlled turbos are mapped to something like 5000ft to produce same amount of boost by spinning faster. Beyond this engine lose ~1-1.5% power for every 1000ft.
They can be tuned to spin faster beyond this point as long as it is thermally and mechanically not limited.
Plus this is how the maximum boost would behave. For “normal” driving since boost is not constantly maxed, the whatever effect input air pressure has on boost would not be noticeable to the driver unless we are talking about insane elevations, as turbo will spin faster within regular mapping points (like spinning at 40% at elevation rather than 15% at sea level).
Boost from a turbo is largely determined by output back pressure not input pressure. With lower air pressure turbo will spin faster to reach about the same output pressure. So modern electronically controlled turbos are mapped to something like 5000ft to produce same amount of boost by spinning faster. Beyond this engine lose ~1-1.5% power for every 1000ft.
They can be tuned to spin faster beyond this point as long as it is thermally and mechanically not limited.
Plus this is how the maximum boost would behave. For “normal” driving since boost is not constantly maxed, the whatever effect input air pressure has on boost would not be noticeable to the driver unless we are talking about insane elevations, as turbo will spin faster within regular mapping points (like spinning at 40% at elevation rather than 15% at sea level).
Last edited:
Because it has a large effect on naturally aspirated engines which are majority of vehicles.Literally the whole state of Wyoming and colorado run lower octane fuels because of it.
Explain to me why high elevation offer low octane fuels please
Yeah, I lived at over 7,000ft for many years and still live at around 5000
Because at high elevation naturally aspired engines achieve lower cylinder pressure (due to air being less dense) which eliminates the risk of auto ignition of lower octane fuel.
Okay, makes sense, probably something that maybe they just haven’t changed over years being that most vehicles are able to tune themselves better at elevation
![SLEE – ARB Compressor Mount now available [installed pics added]](https://www.landcruiserforum.com/data/files/featured_images/47/featuredimages_c945360389b24542.webp)
Similar threads
