How much timing can you run on 87 octane??

Chevyguy · 09-10-2001, 07:58 AM

After putting almost 15K miles on my Mustang, and always having a nice Sunpro dial in timing light, I finally checked the timing on the stang. I first checked it as is, got about 17°. Thought that was high, checked my engine sticker, which was on the broken off coil cover courtesy of the PS pump fiasco 2 weeks ago. They list 10°, but first have to remove the spout conn. I had found this during the valve cover change, right in the TFS harness. So pop it off, start it up I get 8°. I was tempted to bring it up then, but looks like I need a special wrench to reach the bolt, like a ford version of my Chevy wrench which is a 9/16 hex. I assume 12 or 13 mm.

Next Q, what is the average max timing I can run on 87 octane?? If I am going to bump to 10° would like to go higher if I can. I know it's mostly trial and error, just want to get some ranges to play with.

Oh, yeah, after I get a good 87 baseline, I will find a good setting for 92-93 octane for track blasts before the track closes for winter

Then I'll put some #'s up for ya guys

------------------
Frank W
90 5.0 LX coupe Daily driver. Silencer removed, K&N filter. Flexalite fan, 3 core radiator. FMS flywheel and Clutch, FMS blue wires Energy Suspension end links
88 Notch 2.3L 5 speed Parts/beater car My two Notchbacks

74 Chevy Laguna Type S-3 305 Finally fixed getting a 454 to put in garage
<A HREF="http://www.chevellepages.com/folingo" TARGET=_blank>www.chevellepages.

09-10-2001, 07:58 AM	#1
Chevyguy Backyard Mechanic/Chemist Join Date: Feb 2001 Location: Acton MA USA Posts: 435	How much timing can you run on 87 octane?? After putting almost 15K miles on my Mustang, and always having a nice Sunpro dial in timing light, I finally checked the timing on the stang. I first checked it as is, got about 17°. Thought that was high, checked my engine sticker, which was on the broken off coil cover courtesy of the PS pump fiasco 2 weeks ago. They list 10°, but first have to remove the spout conn. I had found this during the valve cover change, right in the TFS harness. So pop it off, start it up I get 8°. I was tempted to bring it up then, but looks like I need a special wrench to reach the bolt, like a ford version of my Chevy wrench which is a 9/16 hex. I assume 12 or 13 mm. Next Q, what is the average max timing I can run on 87 octane?? If I am going to bump to 10° would like to go higher if I can. I know it's mostly trial and error, just want to get some ranges to play with. Oh, yeah, after I get a good 87 baseline, I will find a good setting for 92-93 octane for track blasts before the track closes for winter Then I'll put some #'s up for ya guys ------------------ Frank W 90 5.0 LX coupe Daily driver. Silencer removed, K&N filter. Flexalite fan, 3 core radiator. FMS flywheel and Clutch, FMS blue wires Energy Suspension end links 88 Notch 2.3L 5 speed Parts/beater car My two Notchbacks 74 Chevy Laguna Type S-3 305 Finally fixed getting a 454 to put in garage <A HREF="http://www.chevellepages.com/folingo" TARGET=_blank>www.chevellepages.

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