Anyone running something other than 87?

[04ssSilverado]

i dated a chemist for a very short time, because she made about as much sense.

[scrming]

I can see the ECU pulling timing from time to time... but I don't have enough insight to know why it is pulling timing... the knock sensor PIDs on my dashhawk don't seem to work... all i can monitor is Spark Retard.... seems like it pulls less timing when running higher octane... but I can't be 100% sure why... could be a number for factors...

[scrming]

Originally Posted by 04ssSilverado

i dated a chemist for a very short time, because she made about as much sense.

"She makes champagne out of 7-Up and cheap wine... Like a chemist"

- Was (Not Was) - Earth to Doris

[CamaroDreams07]

Originally Posted by squat

I only run what is specified in the manual. Like others have said, the issue is with the PCM controlling the burn, higher than 87 wouldn't give me any extra benefit because my PCM is tuned for 87. Now if I were to get a tune for my car (if one ever came out) and was able to switch the timing then I would use different octane.

On a side note, it's interesting that octane is not the proper chemical term for the carbon chain. It's a pentane with 3 extra carbons and looks like this:




It's correct chemical name is 2,2,4 tri-methyl pentane. The 2/2/4 denote where the methyl groups are on the pentane chain. I suppose they call it octane because technically it still has 8 carbons, and octane rolls off the tongue better than 2,2,4 tri-methyl pentane.

I took organic chemistry too..congratulations on cracking this huge coverup by the gas companies.

[squat]

Originally Posted by CamaroDreams07

I took organic chemistry too..congratulations on cracking this huge coverup by the gas companies.

Dude, no need to be a dick. I like learning random tidbits of information, I figure others might too. If you didn't care for that piece of knowledge kindly just ignore it. Since you already knew that piece of knowledge there is no need to comment on it one way or another.

[bigd1276]

Sorry fellas, I failed High School chemistry. I run nothing but Sunoco 92. Not sure why, I just do.

[JesusIRL]

Hey guys, I've been a quiet lurker on this site for a while now but I actually need to do some questioning myself here on this one so I finally registered lol.

The salesman at the dealership where I bought my car told me to put nothing but premium gas (93 octane here)... I saw the OM said 87 or higher... I read above that running higher octane would cause more carbon buildup which I REALLY don't want. Was that statement true? Would there be any negative effects if I switch down to 87 octane now?

My car has roughly 230 miles on it only so far.

[scrming]

Originally Posted by JesusIRL

Hey guys, I've been a quiet lurker on this site for a while now but I actually need to do some questioning myself here on this one so I finally registered lol.

The salesman at the dealership where I bought my car told me to put nothing but premium gas (93 octane here)... I saw the OM said 87 or higher... I read above that running higher octane would cause more carbon buildup which I REALLY don't want. Was that statement true? Would there be any negative effects if I switch down to 87 octane now?

My car has roughly 230 miles on it only so far.

Salesman is wrong... you can run 87...

Not sure of the carbon build up... my gut instinct is that it wouldn't be a problem... but I have nothing to back that up...

[JesusIRL]

Awesome, thanks!

[squat]

The grade of gas you put in should not damage it whether it needs higher octane or lower. The computer should detect the higher/lower grade of gasoline and adjust ignition timing to match.

However, I remember some of the V8 guys saying that their car was stuck on the 87 octane ignition tables even though they put only premium in. This is because the dealer put 87 in for the first tank and the car never relearned for the higher octane. My advice is to just stick to what's in the manual, 87 is cheaper and without a tune you probably don't get much in the way of performance from higher grade.

[garcmol]

Originally Posted by squat

I only run what is specified in the manual. Like others have said, the issue is with the PCM controlling the burn, higher than 87 wouldn't give me any extra benefit because my PCM is tuned for 87. Now if I were to get a tune for my car (if one ever came out) and was able to switch the timing then I would use different octane.

On a side note, it's interesting that octane is not the proper chemical term for the carbon chain. It's a pentane with 3 extra carbons and looks like this:




It's correct chemical name is 2,2,4 tri-methyl pentane. The 2/2/4 denote where the methyl groups are on the pentane chain. I suppose they call it octane because technically it still has 8 carbons, and octane rolls off the tongue better than 2,2,4 tri-methyl pentane.

ummm....... huh?

[mfr1950]

Been using 89 in mine,seems to idle smoother, also accelerates smoother.. IMO

[speedymike]

Does the 2SS (426 hp w/6 speed manual) require premium fuel or will regular work fine in it? Has anyone with this engine/tranny combo tried regular? The identifying info next to the earlier posters on this thread all seem to have the V6 and I'm guessing that's what they have been talking about. Thanks for the help! I am expecting to get mine within the next week or so...can't wait!

[ckaram]

Originally Posted by speedymike

Does the 2SS (426 hp w/6 speed manual) require premium fuel or will regular work fine in it? Has anyone with this engine/tranny combo tried regular? The identifying info next to the earlier posters on this thread all seem to have the V6 and I'm guessing that's what they have been talking about. Thanks for the help! I am expecting to get mine within the next week or so...can't wait!

You must put premium in your SS or you risk reducing its performance. V6 takes regular.