Can someone help me find the octane requirements for these following cars?

[LTC8K6]

lol okay? and?

was that on the op list?

The mid-grade is purely there to make more money for the station

Try to keep up... 😀

:beer:

 

[LTC8K6]

semi-hemi

Yeah, it shuts off 4 of it's cylinders a lot. 😀

 

[angry hampster]

Originally posted by: LTC8K6

semi-hemi

Yeah, it shuts off 4 of it's cylinders a lot. 😀

..Or Hemi is nothing but a marketing gimmick these days. Chrysler hasn't made a real hemi since the 1970s.

 

[LTC8K6]

No one cares if it's really a hemi, any more than they care what vortec or triton or duratec or duramax or vortec max or iforce or endurance or northstar means, or any other engine marketing terms...

They are all marketing, so why single out Chrysler's marketing? The engine is part of the hemi lineage.

Besides, my hemi is in a Jeep, not some cheap Chrysler. 😀

 

[Demo24]

Originally posted by: LOUISSSSS

Originally posted by: Fenixgoon


the reason for using specific octane ratings is to prevent premature detonation (engine knocking). engines with higher compression ratios (or forced induction) generally need higher octane gasoline so as to prevent the fuel/air mixture from igniting due to compression alone (the mixture heats up as it is compressed). diesel engines, on the other hand, have *very* high compression ratios and use this to ignite the diesel/air mixture instead of having a spark plug.

i use the highest octane available whenever i fill my car (99 VW Passat 1.8T). the recommended minimum is 91 octane in my case.

if your mfg recommends 91, why are you using 93 then? according to your reasoning above, anything above what is recommended is 100% wasted + will lower fuel efficiency (mpg)

Thats the minimum to have optimal operation. Thus 93, or slightly higher would be more preferable. 91 in some cars can have a slight power difference compared to 93. Also I've never seen 91 octane, where I am it's just 93 which I am pretty happy about 🙂

 

[angry hampster]

Originally posted by: LTC8K6
No one cares if it's really a hemi, any more than they care what vortec or triton or duratec or duramax or vortec max or iforce or endurance or northstar means, or any other engine marketing terms...

They are all marketing, so why single out Chrysler's marketing? The engine is part of the hemi lineage.

Besides, my hemi is in a Jeep, not some cheap Chrysler. 😀

Your Jeep is a cheap Chrysler. This is coming from a fellow Jeep owner. 😉


I just really didn't like the whole "YEAH ITS GOT A HEMI" marketing campaign they ran a few years ago. I thought it was annoying as hell and deceptive in a way. Hemi refers to having hemispherical combustion chambers in the heads. In this sense, my Harley has a perfect hemi motor, your Jeep does not.

 

[herm0016]

out here a lot of the regular is 85 octane, not 87 like it was in michigan.

 

[EightySix Four]

In any recent performance car, low octane shifts to different tables in the PCM that have their timing retarded to avoid knock. This usually has a decrease in power. Turbo charged engines often lower the boost as well. Honestly it's a very small difference in price and there's no reason not to run 93/91 in a car that asks for it.

 

[LOUISSSSS]

how do you guys explain to a 50 year old man who's been driving a large SUV that is recommended 87 octane that putting in 93 octane gives u 0 performance benefits (hp/torque) and 0 fuel efficiency benefits?

 

[mb]

Originally posted by: LOUISSSSS
how do you guys explain to a 50 year old man who's been driving a large SUV that is recommended 87 octane that putting in 93 octane gives u 0 performance benefits (hp/torque) and 0 fuel efficiency benefits?

Haha, good luck with that one. You could probably show him all the tests done on several cars including the exact one he drives, and he would probably still reply with something like, "I don't care what they say, it feels better to me."

 

[LTC8K6]

Your Jeep is a cheap Chrysler.

What did you think I put the smiley there for?

Stop trying to bait me, please.

I love my Jeep and it's Hemi(R).

 

[LOUISSSSS]

Originally posted by: mb

Originally posted by: LOUISSSSS
how do you guys explain to a 50 year old man who's been driving a large SUV that is recommended 87 octane that putting in 93 octane gives u 0 performance benefits (hp/torque) and 0 fuel efficiency benefits?

Haha, good luck with that one. You could probably show him all the tests done on several cars including the exact one he drives, and he would probably still reply with something like, "I don't care what they say, it feels better to me."

he says he feels the torque with the 93 octane...
he also says he puts in "Octane Booster 110+" when he was doing car service, and he said he always got to the customer first...

 

[zerocool84]

Originally posted by: LOUISSSSS

Originally posted by: mb

Originally posted by: LOUISSSSS
how do you guys explain to a 50 year old man who's been driving a large SUV that is recommended 87 octane that putting in 93 octane gives u 0 performance benefits (hp/torque) and 0 fuel efficiency benefits?

Haha, good luck with that one. You could probably show him all the tests done on several cars including the exact one he drives, and he would probably still reply with something like, "I don't care what they say, it feels better to me."

he says he feels the torque with the 93 octane...
he also says he puts in "Octane Booster 110+" when he was doing car service, and he said he always got to the customer first...

He's already old and set in his ways. It doesn't hurt anybody so mine as well just let him be.

 

[LOUISSSSS]

well, indirectly it hurts me because hes a relative and our finances run in a circular loop, and we dont need anyone wasting money on gas these days..

 

[c3p0]

If it?s really important for you to explain the why behind the octane recommendations for a specific vehicle, try pointing out the Powertrain Control Module (PCM) of the vehicle. Explain that it?s a small computer that controls the engine and/or transmission. It is loaded with very specific software often referred to as strategy and/or calibration. That strategy/calibration was developed using specific fuel types and/or grades. The software will only control the engine within the ranges it was designed for. Therefore, using fuel types that exceed the limits of the software will not provide any additional performance gains. Basically, it?s just wasted octane.

On another note. I resent your notion that being 50 years old means you are stupid or incapable of understanding or too stubborn to change. I am older than that age and work for a major automotive manufacturer developing engine calibrations for almost 20 years. So it is possible for someone older than 20 to be reasonably intelligent. If you?re lucky, someday you too will reach 50 years of age.

c3p0
:beer: