br23will

Does anyone have problems running 93 octane in their car. I get an occasional long crank. Only when running 93 as opposed to 87

11SHELBYGT500

What's 93 octane?

br23will

Fuel. I hope you're running in a GT500

11SHELBYGT500

We don't have that here.

texastboneking

I run it in my cobra. But I also have an 11 to 1 compression ratio and 87 causes detonation in my car. So I need the 93. No long cranks for me

br23will

I'm thinking about putting in an iridium plug. Opposed to the platinum motorcraft

01GT

I have denso iridium in my 01gt. I love them.

br23will

I'm thinking ngk iridium ix. Any thoughts?

cpotts13

Let me be the one to ask the dumb question... do you have a 93 octane tune??

texastboneking

91 and 93 octane tunes are almost identical. So I just run a 91 tune. We only have 93 octane stations. No 91.

cpotts13

Yeah, 93 is closer to 91 in actuality.

Glenn

its a waste to run the 93 in a more or less stock 99-04 gt. I would think the long would crank would have nothing to do with the 93 oct. Does it only do it after you run it for a while or all the time? Like from a cold start up

br23will

I do have it tuned for 93. The long crank happens at random. Does not matter hot or cold. The only thing I can figure is the fuel. It never did it with 87 octane

shaunrc

Texas bone king is running 11.1 compression ratio that is why he doesn't hear that the only time you run premium fuel is either OE specs or you raise the compression ratio

Knight

don't run 93 in a stock 04 gt engine unless you have it tuned for it. Just wasting money on the extra octane if your timing isn't bumped to take advantage of it.

Also forget the ix plugs the normal NGKs will work fine and are much cheaper and most of the time are less finicky about gap size.

01GT

I run denso iridium. Denso has the worlds smallest tip. And has the most iridium. Definatley noticed a difference on a smother throttle at upper rpm range.