Timing Question

Comatose · 03-20-2004, 06:06 PM

1986GT w/the mods listed below.

I recently found out that I've been trying to set my timing wrong. I was mistaking the TFI harness for the spout connector. Obviously, it didn't work right.

With my car idling at 750-800rpm and the spout connector plugged in, I get a reading of 14*btc. Holding it at about 2500rpm it goes up to approx 20* (it's hard to get an accurate reading working the throttle and timing light at the same time).

With the car idling and the spout connector disconnected, I get a reading of 0-2*btc.

I've read that the timing should be set with the spout connector unplugged, if that's the case the timing's way off. If I set the timing up to 14*btc, is that going to put the timing at 25*+ at an idle with the connector plugged in?

Thanks,
Jeremiah

BTW--The car seems to run fine, it'll pull up to 5k, and gets decent fuel mileage (19-20 combination of city/hwy.)

Comatose · 03-21-2004, 03:28 PM

After searching for awhile, I answered my own question.

I set the base timing at 14* and the car seems to have a lot more low end grunt, and overall power. The car doesn't ping, so I could probably bump it up to 16*, but I'm going to play it safe and leave it at 14* for now.

3.27s coming next week!

Hozer 88GTConv · 03-22-2004, 09:34 AM

"An initial spark setting of 14* with an OE EEC-IV processor produces apporximately 38* of total ignition advance.
Engines backed by an AOD transmission typically prefer less initial spark timing than manual transmission 5-liters."

page 275, Mustang 5.0 Technical Reference and Performance Handbook, Al Kirschenbaum.

03-20-2004, 06:06 PM	#1
Comatose Registered Member Join Date: Oct 2001 Location: Goldendale, WA, USA Posts: 84	Timing Question 1986GT w/the mods listed below. I recently found out that I've been trying to set my timing wrong. I was mistaking the TFI harness for the spout connector. Obviously, it didn't work right. With my car idling at 750-800rpm and the spout connector plugged in, I get a reading of 14btc. Holding it at about 2500rpm it goes up to approx 20 (it's hard to get an accurate reading working the throttle and timing light at the same time). With the car idling and the spout connector disconnected, I get a reading of 0-2btc. I've read that the timing should be set with the spout connector unplugged, if that's the case the timing's way off. If I set the timing up to 14btc, is that going to put the timing at 25+ at an idle with the connector plugged in? Thanks, Jeremiah BTW--The car seems to run fine, it'll pull up to 5k, and gets decent fuel mileage (19-20 combination of city/hwy.) __________________ Jeremiah 1986 Mustang GT K&N Filter, Removed Air Silencer, Black Magic Fan, 65mm Explorer TB, 110lph BBK Fuel Pump, F/M Force II Cat -Back, O/R h-pipe, U/D's Timing@14 1986 Mustang LX SSP--new project car AOD, 3.27's, Dumps, 238k miles

03-21-2004, 03:28 PM	#2
Comatose Registered Member Join Date: Oct 2001 Location: Goldendale, WA, USA Posts: 84	After searching for awhile, I answered my own question. I set the base timing at 14* and the car seems to have a lot more low end grunt, and overall power. The car doesn't ping, so I could probably bump it up to 16, but I'm going to play it safe and leave it at 14 for now. 3.27s coming next week! __________________ Jeremiah 1986 Mustang GT K&N Filter, Removed Air Silencer, Black Magic Fan, 65mm Explorer TB, 110lph BBK Fuel Pump, F/M Force II Cat -Back, O/R h-pipe, U/D's Timing@14* 1986 Mustang LX SSP--new project car AOD, 3.27's, Dumps, 238k miles

03-22-2004, 09:34 AM	#3
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	*14 BTDC** "An initial spark setting of 14* with an OE EEC-IV processor produces apporximately 38* of total ignition advance. Engines backed by an AOD transmission typically prefer less initial spark timing than manual transmission 5-liters." page 275, Mustang 5.0 Technical Reference and Performance Handbook, Al Kirschenbaum. __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Timing chain question	Red5Ltr	Windsor Power	2	06-30-2004 11:35 PM
timing question	CrimsonRacing	Windsor Power	5	06-30-2003 10:32 AM
timing question	93SVTstang	Windsor Power	1	09-11-2002 09:54 PM
Help fast please gotta make it to the track "timing question"	Dark_5.0	Windsor Power	2	08-03-2001 09:59 PM
timing advance question	84stangLX	Windsor Power	1	03-29-2001 04:54 PM