Exhaust flames on over run

[Tre-Cool]

What would people recommend to do to get flames coming out the exhaust on overrun.

I'm not sure if i should go for negative timing or positive timing when the throttle is closed to "ignite" the fuel.

Anyone got any tips.

[joeygc5]

moderate timing and alot of fuel, but why? your more prone to damage a turbo doing this. imo

[swingtan]

I would have thought......


Disable DFCO
Fudge VE to be rich on low MAP pressure
Set timing to be very late, possibly slightly negative


Oh, and I believe the other requirement is to not run CAT's. And a straight through system.

Simon

[Tre-Cool]

I would have thought......


Disable DFCO
Fudge VE to be rich on low MAP pressure
Set timing to be very late, possibly slightly negative


Oh, and I believe the other requirement is to not run CAT's. And a straight through system.

Simon

First 2 tried, i even tried lowering base spark in gear (i.e when letting off the pedal) to negative -8 degrees and still nothing.

As for cats well they dont exist in my world.:grin:

I've actually found that having dfco on helps get the burble/crackle sound. I remember a few years back on a cruise one night someone had commented on the flames coming out the exhausts and it was running dfco back then.

While i have been tuning the new motor recently i have obviously had it off for the auto ve process.

So have been curious since then on how or what makes it happen.