Timing for lower octane?

jimberg · 08-05-2006, 10:15 AM

No detonation on a DynoJet? If that's what you mean, don't forget that a DynoJet doesn't properly load the engine to test for detonation. That's what Mustang Dynos are good for, however.

Dark_5.0 · 08-05-2006, 12:22 PM

Well considering I raced the hell out of that engine on 87 octane and never had an issue one in 3 years I would say it was running fine. Mid 12's @108 mph. It would start to detonate at 16 degrees of initial timing with 87 octane.

I ran 93 octane and bumped the timing as high as 18 degrees initial but it ran the fastest at 14 degrees and 87 octane.

I tweeked it out over the course of a couple hundred 1/4 mile runs.

It could have something to do with the crappy air where I am at.

3000-5700 ft density altitude.

Vamp89 · 08-05-2006, 06:45 PM

She run better set that high.

jimberg · 08-06-2006, 12:30 PM

Quote:

Originally Posted by Dark_5.0

It could have something to do with the crappy air where I am at.

3000-5700 ft density altitude.

That makes sense.

08-05-2006, 10:15 AM	#1
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Re: Timing for lower octane? No detonation on a DynoJet? If that's what you mean, don't forget that a DynoJet doesn't properly load the engine to test for detonation. That's what Mustang Dynos are good for, however. __________________ 351W 89 Mustang GT Convertible

08-05-2006, 12:22 PM	#2
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: Timing for lower octane? Well considering I raced the hell out of that engine on 87 octane and never had an issue one in 3 years I would say it was running fine. Mid 12's @108 mph. It would start to detonate at 16 degrees of initial timing with 87 octane. I ran 93 octane and bumped the timing as high as 18 degrees initial but it ran the fastest at 14 degrees and 87 octane. I tweeked it out over the course of a couple hundred 1/4 mile runs. It could have something to do with the crappy air where I am at. 3000-5700 ft density altitude. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

08-05-2006, 06:45 PM	#3
Vamp89 Registered Member Join Date: Mar 2006 Location: Fort Wayne, Indiana Posts: 49	Re: Timing for lower octane? She run better set that high. __________________

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