oxfordgt

What do you mean cut and paste? You better learn more about cars and fuels before you try to give out advice. 105 octane race fuel is for high compression engines over 11.2:1. Do some research then come back and say your sorry.

akelemecz

Haha .. ok sorry .. I'm a noob that knows nothing about cars .. *********** Be nice or be banned. One warning....
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Basically you're telling me that if I'd take my GT ... and run it with my 100 wet shot running 87.. and then take it ... get it tuned with 105 .. then take it back and run it .. it wouldn't do me a damn bit of good ?

oxfordgt

Yeah if you get it tuned for that which means advancing your timing you will get and improvement. But just run it untuned and use 105 then you just spent alot of money for nothing.

2004GTRED

isnt there a nice sticky about fuel ratings?

blstoff

this may help . http://www.theserviceadvisor.com/octane.htm

oxfordgt

Ha see now that is a guy that does his research. Akelemecz you can learn from this guy LOL

ShadowDrake

They have higher compression... because of this they need a higher octane. The 03/04 Cobras are supercharged as well, meaning a need for higher octane.

As much as I hate the guy you're replying to, you're incorrect here. Cam timing yes, but ignition timing, no. When people advance their timing they only advance the ignition timing... When the spark happens has no effect on how much air/fuel is in the cylinder. I'll think up an analogy if this doesn't make sense.

Yes and no. 93 itself is not cleaner, but all fuel suppliers add detergents to the higher octane fuels as an incentive to get people with cars designed to run on 87 octane to buy higher.

Depends. What are you adjusting with the tune? If you're advancing the timing, yes, but with nitrous you really shouldn't be advancing the timing at all, in fact, you should move it back a few degrees to be safe.

So much incorrect information that just flat out doesn't make sense flying around this thread.

bransdaman78

akelemecz said that the 93 is a better fuel - of which he is correct - its cleaner and better for the longevity of a tuned motor for shure. However you are incorrect in some respects - 105 will make more power than 87 - sorry to tell you - but yes you do need a tune to take advantage of that potential gain...

but for your stock car 87 is just as good - now wether 93 is a total waste is another debate - bc your car will run better with 93, but is it NECESSARY ..no is it a waste I dont think so - the 93 does have more detergents
I would jsut say run what ever you think is better - I run 93 but I have a tune - before the tune I ran 87
I would have to agree that running 93 full time is a waste on a stocker - but 93 every once in a while wont hurt it... however if youve been running 93 - I would say stick with it - bc I hear horror stories of the down grade if you have been running it a long time.

mattmoto441

i run 91 in all my stangs b/c its not gonna coast me that much more for a full tank like what a buk or two, dont be such cheep asses[:@]

2004_mustang_gt

So would it be more better to put 91 octane in a 2004 mustang gt? Just wondering because it doesn't say that anywhere. thanks