Ummm your VTEC engaged earlier from different fuel… yea… okay… that post pretty much sums up the crack the people in this thread are on.
You did not clue in to Mark fucking around…as usual.
Who’s on crack?:420:
Just use whatever you used when your car was tuned, it only makes sense.
I’d only retune with different fuel when I see some unbiased dyno charts.
wtf, did no one read the chart/link i posted on page one.
Gas has more energy then a gas + ethanol mix. No experiments needed. The only thing to decide is if the price is worth the millage saved (for those that don’t need octane rating as a deciding factor)
The octane rating is a measure of the resistance of gasoline and other fuels to detonation. If u need a higher octane to prevent detonation then this should be ur determining factor for a higher grade.
“Octane rating does not relate to the energy content of the fuel. It is only a measure of the fuel’s tendency to burn in a controlled manner, rather than exploding in an uncontrolled manner.”
:biggthumpup:
Hey, correct me if I’m wrong but I’m going to try and sum up what you said.
It’s pretty much like getting brake fluid that’s good till 500 degrees. But if your brake fluid temps only get up to 190 degrees max, you won’t really see much benefit from running 500 degree fluid as 240 degrees should be good enough?
But some people might think that 500 degree fluid might make them stop faster.
Yeah, that’s basically it.
If your car does not require higher octane for knock resistance, than you’re making your car slower and less inefficient. Higher octane equals higher energy needed to burn it. If your car is not getting any detonation with 87, than anything above 87 is a waste of money and slows you down.
LOL
Funny thing about all this is that I always hear a lot of ricers say that “Yeah I only fill up with 91/94 octane and all they have is a stock NA engine”
Also, I use esso primarily. As mark pointed out, its a loyalty thing. They have Timmies and they have Aeroplan which I use to travel.
That being said. Same car, same week, went for an etest on a full tank of Esso. Failed hard. Identical procedure. Big long hard boot right before test to heat up the cat. Later on that week, repaeated the conditions with Shell 91, I was a lot closer to passing. No shit. (Esso was also 91 btw)
I didn’t notice any power difference between the two.
Still failed with Shell. I went to a Sunoco 94 with some Methyl Hyrdate as additive, passed with flying colours later that week. I didn’t even run it as a hot rod. Ran a RB20 with a vented BOV, failing cat and a full exhaust and passed with 94 and methyl hydrate as a regular 240. I’m not making this up.
So true!
I always laugh when I see FS ads, “Always filled up with 94 or 91 octane”
First of all, they’re lying, second of all, what does it matter with a stock pos mid 90’s na grocery getter? Its literally throwing money away.
Here’s a true story.
Diagnosing hard start problems and overall shitty running condition of a ninja 250. (A very very basic pedestrian shit box motor that should be powering a lawn mower) changed plugs, filters, air, oil, blah blah, cleaned pick up, petcock, anything fuel related. Asked her what gas shed been running. She tells me 94. I dump the tank, fill up 87. Voila! Turned a shitty running shitty engine with hard start and hesitation to a shitty engine that ran great!
^I wonder what the results would be if you just ran regular 94 sunoco with no additives.
Do some vehicles really require 94 gas for knock resistance? I thought the higher end cars and turbo vehicles just require premium gas (91).
It wouldn’t make sense if it was required to fuel up on 94, or every fueling station here in Canada would have 94 no?
Depends on the vehicle.
S13’s call for “premium” fuel lol
Then again, I believe premium is referring to 91 as per owners manual.
Check it out.
Corvettes require 91 minimum. Stealths, some mustangs etc etc
I don’t know of any production cars that require it. It’s mainly a gimmick to have something else no one else has.
There are cars that are tuned for it though and will detonate with anything lower.
VERY quick search, very basic information.
Still trying to find a link to proven evidence that a lot of O.E cars require premium fuel
91 RON equals 86 AKI
AKI is what we go by.
EG, a 1990 Acura Integra calls for a minimum 91 RON in teh owners manual. That fooled me into thinking it needed 91 on a stock car. I did some reading on it and found out, I only required the regular shitty old gas.
Lots of people see 91 or higher RON and assume, and RIGHTLY so.
AKI is also known as PON!!!
So how about turbo vehicles than that come from the factory? I’m sure you can’t use 85 gas in it?
Also, why do all tuners tune cars for either 91 or 94?
There must be a logical reason.
I was gonna type in AKI…but I was not sure. My memory is fucked.
Glad you cleared that up for me! Explains a lot! 
Lots of turbo factory vehicles require 91…thats a 95 RON or higher.
Pretty much any turbo car calls for a 90 minimum for optimal runing condition, anything lower and the the knock senor pulls timing.