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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: plik on January 20, 2017, 10:52:53 am

Title: What is the best adjustment for engine TIMING ?
Post by: plik on January 20, 2017, 10:52:53 am

What is the best adjustment for engine timing?

Is it exactly at 0, or do you like to set it a little before or after that?

And I'm just talking about regular daily driving -- in city, with occasional freeway stretches. I'm not towing, I'm not off-roading.

I have a 1987-1995 GM 350 5.7 TBI on a K20 (3/4 ton suburban) with 35 inch tires.

(http://repairguide.autozone.com/znetrgs/repair_guide_content/en_us/images/0900c152/80/07/d9/8e/medium/0900c1528007d98e.gif)

Title: Re: What is the best adjustment for engine TIMING ?
Post by: Captkaos on January 20, 2017, 06:22:20 pm

TBI is set to zero and the computer controls the advance.  You have to disconnect the wire in the loom by the brake booster to set the timing.

Title: Re: What is the best adjustment for engine TIMING ?
Post by: plik on January 26, 2017, 12:59:28 pm

Clarification on the original question:

I've always set mine to 0, but I wondered if anyone modified theirs at all to a number other than 0.

Title: Re: What is the best adjustment for engine TIMING ?
Post by: bd on January 26, 2017, 01:43:58 pm

For emissions testing it's best to set at zero, although up to 2° BTDC is generally allowed.  For a slight improvement off the line and at low speed around town, up to 6° BTDC might work for a daily driver as long as there is no associated engine ping.