Camaro LT5

[mikels]

Originally Posted by Stielow

My cars will put so much heat into the exhaust the pipes are almost purple to the tips. So it gets very hot and grows 3/4 of an inch.

Yup - they get hot.....

[jmac]

Originally Posted by mikels

Yup - they get hot.....

Is that your "burble" tune Dave?

[mikels]

Originally Posted by jmac

Is that your "burble" tune Dave?

Nothing intentional! Just over-run - happens when fueling changes rapidly such as going from deep throttle to lift-foot (or clutch-fuel cutoff) - excess fuel continues combustion into the exhaust system. Sometimes (like this photo) mixture in exhaust is too rich to burn until it reaches outside air and then has enough oxygen to burn. Kills mosquitoes as a side benefit....

I have tinkered with the calibration on how enters fuel-cut (either decel or clutch) - as well as rate of change of targeted fuel ratio and spark timing during these events to minimize burble - but can only do so much when going from ~800-900g/sec airflow to ~50-100g/sec in short order.

Makes cool photos though!

Dave

[Stielow]

Originally Posted by mikels

Nothing intentional! Just over-run - happens when fueling changes rapidly such as going from deep throttle to lift-foot (or clutch-fuel cutoff) - excess fuel continues combustion into the exhaust system. Sometimes (like this photo) mixture in exhaust is too rich to burn until it reaches outside air and then has enough oxygen to burn. Kills mosquitoes as a side benefit....

I have tinkered with the calibration on how enters fuel-cut (either decel or clutch) - as well as rate of change of targeted fuel ratio and spark timing during these events to minimize burble - but can only do so much when going from ~800-900g/sec airflow to ~50-100g/sec in short order.

Makes cool photos though!

Dave

It does make cool photos...


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[raustinss]

So do the red rotors , asking for mercy lol