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If you have any doubt it's fuel related get the injectors flowed.
Have you run the car on a Dyno to see if that lean of a mixture nets you any more power ? Typically 11.4-11.6 is a good place to be Unless it makes more power each and every Time going leaner to 12.0. The 4g63 is an old engine and keeping it richer keeps the cylinder cooler.
Fwiw, my stock engine made the same power at 12.0 and 11.4 . Now my built engine a makes a few more at 11.7-11.8. These tests were run a few times and back to back on a Dynojet .This is using 80-85% ethanol measured electronically.
Pump e85 could be less and not as safe to run lean. It's important to know what content you are running.
Respect the fuel and cylinder pressure limits and avoid failure.
I'd also run the car on a Dyno and adjust timing. In a controlled environment you can see exactly if that degree of timing is netting you power or not.
Typically you start with low timing and work your way up a measure the gains. If it's not picking up much power then take the timing back out.
People don't understand that more timing isn't always more power and burn things up.
If you have any doubt it's fuel related get the injectors flowed.
Have you run the car on a Dyno to see if that lean of a mixture nets you any more power ? Typically 11.4-11.6 is a good place to be Unless it makes more power each and every Time going leaner to 12.0. The 4g63 is an old engine and keeping it richer keeps the cylinder cooler.
Fwiw, my stock engine made the same power at 12.0 and 11.4 . Now my built engine a makes a few more at 11.7-11.8. These tests were run a few times and back to back on a Dynojet .This is using 80-85% ethanol measured electronically.
Pump e85 could be less and not as safe to run lean. It's important to know what content you are running.
Respect the fuel and cylinder pressure limits and avoid failure.
I'd also run the car on a Dyno and adjust timing. In a controlled environment you can see exactly if that degree of timing is netting you power or not.
Typically you start with low timing and work your way up a measure the gains. If it's not picking up much power then take the timing back out.
People don't understand that more timing isn't always more power and burn things up.
Thanks Abacus.
Ill atleast remove the injectors to inspect the tops for e85 gunk.
And adjust my fuel map for a more consistent 11.4-6.
The car has never been on a dyno, its always been street tuned. So i might consider soon.
Thanks Abacus.
Ill atleast remove the injectors to inspect the tops for e85 gunk.
And adjust my fuel map for a more consistent 11.4-6.
The car has never been on a dyno, its always been street tuned. So i might consider soon.
Sounds good.
Road logging is not the preferred method of tuning a car . You are barreling down the road hoping that a single knock sensor and hobbyist software isn't beating the bearings out of it .
The last local guy that posted a plug like that blew his engine up the next week "tuning" it.
A $100-200 Dyno session is cheap compared to a problem IMO.
Sounds good.
Road logging is not the preferred method of tuning a car . You are barreling down the road hoping that a single knock sensor and hobbyist software isn't beating the bearings out of it .
The last local guy that posted a plug like that blew his engine up the next week "tuning" it.
A $100-200 Dyno session is cheap compared to a problem IMO.
Yikes. My car has done this twice. Last time was about 2 years ago.
Dyno tunes around here are 450. And the options are minimal with alot of rumors about every tuner. I guess thats the way it goes tho.
Mar 10, 2017, 05:38 PM
