forcefed86
15+ Year Contributor
- 1,007
- 12
- May 23, 2006
-
wichita,
Kansas
Also note that anything above 17* after peak torque I would get knock on my tune. It's all about giving the engine what it wants, when it wants it. Asking others to tell you what timing to run is pointless. Each engine will be different. I do believe the current 16g e85 record holder for e85 runs 0* at peak torque.
EGT's are also far from optimal to try to tune timing. Depending on the placement of the thermocouple, length of the harness and 20 other variables each reading will be different on each engine. Also each engine will have a different EGT temp where HG or other failure occurs. Unless you log this information and run the engine to failure you won't know that number!
Spark plugs are the ONLY way to tune timing, and that is somewhat of an art form, esp with a alcohol based fuel.
IMO, start around 10* peak torque timing and ramp up to 15* or so. Then dial in your max boost and AFR first. Then slowly bump timing while watching your plugs and logging your gains.
This is what my plugs looked like with peak timing at 18* ramping up to 22* by redline. e316g spiking to 36ish settling to 25-26 by redline.
EGT's are also far from optimal to try to tune timing. Depending on the placement of the thermocouple, length of the harness and 20 other variables each reading will be different on each engine. Also each engine will have a different EGT temp where HG or other failure occurs. Unless you log this information and run the engine to failure you won't know that number!
Spark plugs are the ONLY way to tune timing, and that is somewhat of an art form, esp with a alcohol based fuel.
IMO, start around 10* peak torque timing and ramp up to 15* or so. Then dial in your max boost and AFR first. Then slowly bump timing while watching your plugs and logging your gains.
This is what my plugs looked like with peak timing at 18* ramping up to 22* by redline. e316g spiking to 36ish settling to 25-26 by redline.
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