Just curious how the GMS1 adapts to different octante if it does. Cali have crappy 91 octane but I have drove to New Mexico with crappy 90 octane and its not impossible that i will drive to the east coast with the better 93 octane.

Anybody knows how the upgrade sort all this out or we just gonna be knocking. Im assuming the cars are smart about it.

 

It senses the knock and retards the timing advance up to -8*, no low octane tables that we can see anyway.

 

According to GM...

GMS1 was made for 93, but you can also use 91 you just get less performance

 

I would never run Mexican gas in my own car lol. Every rental car Ive ever gotten when going to Mexico couldnt top 50mph :p

 

Yeah and all of us a mile high have to suffer with 91 octane, but the altitude helps us with less air up here anyways.

 

I like having 93. But the price is ridiculous, I'm glad I have the s13 to run 87 lol.

 

91 is the absolute lowest I would run on a LNF! stage 1 is the same as stock oct requirement wise. If I HAD to put 87 or lower than 91 in, it would be a gallon to find a new gas station.

 

That is funny I agree though I wouldnt put anything crappy in my tank if I could amnage to get an SS

 

to add another opinion, basically run the best gas you can.

the stock tune can work with low octane, but the stage tune is strongly recommended against using anything but premium gas (this is why a 'premium gas' only sticker is included).

IIRC the octane rating will slightly vary from state to state, or country to country - especially when differnt blends of gas are concerned. Locally we can get 93 octane ethanol blended, or 91 octane ethanol-free gas... I will always run (d)ethanol-free gas when given the option.

 

Hell the only ethanol free gas i've found in a 50 mile radius is 100 octane cam2 unleaded ..... e10 is everywhere in ny.

 

well, sux to be you then huh?

 

all we have in cali is really 91 and some stations like vp or 76 have 95 theres a vp and carwash by me that has 110 and i dunno what the price is right now and i dont want to know lol probabaly 8$ a gallon

 

There's only 4 stations in my town only one has 93, and thats not the one I go to. The one I go to I get tax free gas
I should fill up with the 93 one time to see the difference.

 

when I'm down in your neck of hte woods, I never have a problem finding 'premium' gas... but I digress, I know it's all "death-anol" blended gas ~ but at least the premium gas has less ethanol than the other grades.

I'm pretty sure you has the same gas as me;
I personally stay away from the Mowhawk/Husky gas, it's IMHO sub-standard, I'd pick any USA-brand ethanol blended gas over the Mowhawk/Husky crap...
The first, and last time I filled on that crap gas, my car ('70 Firebird) wouldn't hold an idle - I fortunately had a source of leaded 110 gas to put into the tank to offset that crap ~ after taking it for a short burn on the highway to get rid of some of that garbage.

Some late model turbo guys swear by the Mowhawk/Husky gas, but after that experiencec in my Firebird, I cannot believe it's any good...

For some reason though there is one gas station type in BC that is unique in Canada as far as I know;
I don't drive it often, but last time I was on the #1 heading back into Alberta I stopped at a station that had 100 octane premium pump gas... I WISH that gas was available here.

 

Wouldn't the premium have more ethanol as it's used in place of more toxic octane boosters, everybody knows it's only used to boost the octane level right?

 

...and to burn cleaner.

 

And there is a minimal power loss on e10 to straight petrol. I use 93 with 10% blend and have no problems.

 

I'm tuned for 60% and have no problems.

 

this is typically incorrect.

Although ethonal (hens forth called deathanol) does have a higher octane rating, it also has worse burn characteristics that real gas;

So (using the locally available gases as examples) the 91 octane rated premium gas will burn more efficiently than the 93 octane rated deathanol blended gasoline.

This is also why you will observe better mileage when using real gas versus blended gas.

If you google it, I'm sure you can come up with more info than I can type...

 

All we have here is blended gas, 87-89-93 all blended. From what I have read the difference is so minimal your mileage will not increase dramatically and I know for a fact it is used to increase octane in place of harsher chemicals. Just from a google search I can see it's a highly debabted subject. I won't call it deathanol as I have seen some great stuff people have done with it as far as HP but if your that worried about an extra 12 miles per tank to run 91 octane without blend more power to you.

 

There's an octane blend calculator online. You put your desired octane, the amount of gallons, and the two octaves you are mixing, and it gives you the amount you need of each.

Theres a Loves by my house that has 100 octane and 110 Leaded. Obv I can't run 110 leaded. So I think I calculated that if I put 6 gallons of 91 and 5 gallons of 100, it would put me at 95 or 96. I haven't ran straight 100, but I did notice a better response from the engine with the blend. It seemed a lot "happier". I also noticed it ran hotter. It normally sits at 192* and it sat at 199-200*. might have been a coincidence and because I was more prone to beat on it.

It was $7/gal too... So I don't run it all the time. When I'm commuting back and forth to work, 91 seems just fine, but I have noticed it has trouble idleing at a cold start up until it warms up. It doesn't on the blend.

 

For older cars, the ethanol actually corrodes old flexible fuel lines, and has a multitude of other issues.

I know where you're coming from though, iirc most states by now require at least all regular and mid grade gases to have ethanol;
But you should notice that typically there is more ethanol in the regular gas than the midgrade, just like there is more in the midgrade than the premium...

When I'm stateside, I try to stick to Shell stations as I trust their blends the most, and just like any other company, they're pretty much held hostage to the state laws regarding fuels...
But where I live, this is not required - so typically only the tree-huger crowd goes out of their way to buy the ethanol blended gasoline ~ purely on the merits of it using a renewable resource.



I'm sure many sateside famers love it because it drives up crop prices, but this ethanol crap hits us all when come time to buy groceries...
(not that you really read of it these days)

 

I have noticed a large increase grocery prices. I know they sell 110 at the local track. I have thought about putting a few gallons in with the 93 I run in it. I might try it out next time I'm there.

 

hmmm wonder if i should get a little octane booster and throw it in my 91 octane to see if the car runs a bit better

 

Just make sure it's not leaded... And if it is, you are a) tuned for it and b) catless.