hot gas!

**DawsonMagnum** · 08-23-2004, 09:40 PM

No, this is *not* about flatulence.

What this is about is race gas. I am in reasonable driving distance of a service station that sells 100 Octane race gas and I am seriously thinking about getting some in my tank at some point to see what that does for performance. I wonder, though, is it safe to run it in these hemi's? Has anyone here done it yet? Would it void my warranty?

I could run it in my Audi S4 all day and it wasn't a problem, but I figure better to be safe than sorry.

**snickle** · 08-23-2004, 09:43 PM

You won't have any problems, but you won;t see any gains either. HIgher octane just means a higher ignition point, so your engine can run at a higher compression. Our Hemi's won;t so you are fine.

**henry** · 08-23-2004, 09:52 PM

Just make sure it is lead free.
There's lots of racing gasoline out there that has lead in it.

You won't see any performance gains, though, so it's just academic...

**billapex** · 08-24-2004, 12:53 AM

The general rule is that you should run the lowest octane possible without pinging. The lower the octane, the easier it is for the ignition system to light off the mixture, and it burns much quicker. The Hemi is designed to run on mid-grade (89 octane), and unless you've done something to increase the power significantly (i.e. blower, turbo, or nitrous), you don't need anything over mid-grade. With, say, 100 octane, you'll notice absolutely no difference in power.
However, because your wallet will be significantly lighter, the car may be faster as a result. :lol:

**DawsonMagnum** · 08-24-2004, 01:02 AM

Thats a shame. I loved the extra power I got FROM my S4 w/ the race gas. So much for quick'n'easy power boost.

**C4me** · 08-24-2004, 05:57 PM

Originally Posted by billapex

The general rule is that you should run the lowest octane possible without pinging. The lower the octane, the easier it is for the ignition system to light off the mixture, and it burns much quicker. The Hemi is designed to run on mid-grade (89 octane), and unless you've done something to increase the power significantly (i.e. blower, turbo, or nitrous), you don't need anything over mid-grade. With, say, 100 octane, you'll notice absolutely no difference in power.
However, because your wallet will be significantly lighter, the car may be faster as a result. :lol:

Right-o BUT, octane is ONLY for anti-knock. Nothing to do with power or quick boost. Nothing at all. IF you have a high compression engine, higher octane will stop the dreaded "knock".