93 Octane?

[JohnNad]

I was just going through the owner's manual and found that it reads under the Recommended Fliuds, Lubricants, and Genuine Parts section that the fuel selection is "Premium Unleaded 93 Octane Only or higher"
Am I mistaken or is 91 the highest we have readily available?

 

[FLOORIN04]

Exxon has 93 octane.In are parts 93 is easy to find.I think on Pa turnpike you can get 94.

 

[GR8_ASP]

I would say use the highest you have readily available and as long as you are not getting any audible knock you should be ok.

 

[SRTRICKY]

I doubt you'll hear any knock with 91 octane (just don't use 87 lol)

 

[Skip White]

Strange they set the car up for 93 when in some parts of the country 91 is all that's available. I suppose the car must really be able to handle 91 or we would be hearing mild to moderate ping, and clatter. I understand the Viper has no knock sensor. Wonder why?

Skip White

 

[JohnNad]

I haven't seen 93 here. I'm sure 91 must be ok, but the wording is "93 only" makes you ask why?

 

[Skip White]

If memory serves me, the Viper pulls out a good bit of timing on the top end, and this is where the the VEC1 and 2 allow you to increase that. So the car is rather conservative on timing, therfor allowing us to run 91.

Many factors involved on this, but It would be nice to see some dyno runs from one fuel to the next. If the VEC does increase timing I would for sure run 93 or boost the 91 before adding timing to the car. Detonation would surly be present otherwise.

Skip W.

 

[Kai SRT10]

I've run on 91 octane (the highest we have here in Colorado) and done just fine.

 

[DG Viper]

Would it be worth trying to use some of that Octane booster?

 

[Skip White]

The only way octane boost would help is if the car needed it, and the only way to truly tell this is to dyno it, of course any notice of ping and clatter could be an indicator, especialy if upon adding octane boost it went away. I will say this much, it's well known that using more than you need can decrease your power. I've heard this from many, including Chrysler corp.

Skip White

 

[Roadrunner]

My research has shown the following values:

2003 Owners Manual - 91 Octane
2004 Owners Manual - 93 Octane
2005 Owners Manual - 91 Octane

2004 SRT10 Ram - 91 Octane

Hmm... do I smell a typo for 04? Everything I've seen or read was that the 505 V-10s were setup for 91 octane operation (to take into account California and other locations lack of 93 octane sources)

Maybe this would be a good "Ask Herb" item?

 

[BOMBOVIPER93]

If i'm not mistaken viper mag covered this issue not too long ago (within the past year). check the Q&A section of your past few issues.

 

[Dyno Dave]

It is calibrated to run on 91 for those unfortunate souls dealing with California fuel quality.

 

[GR8_ASP]

Unfortunate souls? Give it 4 months and let see who is unfortunate!

I'll take 91 if it gets me 12 months of sunny warm weather.

 

[Ooomph]

My 91 octane has done fine at 161mph. 7300 miles of it since May 27th. I figure (since I never use 5th or 6th gear), at roughly 11 mpg, 7300 miles to be 664 gallons. And at ~ $2.05 per, that's roughly $1360 bucks of 91 octane in less than 4 months. And I'd gladly do it all over again.

 

[Marv S]

The AZ racers have run in the desert heat with 91 just fine. Never any problems that I ever heard of.

Higher octanes (like the $$$ 100octane Union 76)were tried but it wasn't neededc.