Why turn up exhaust tips?

For pulls, a lot if indoor competitions have smoke collection rigs so the building doesn't fill up with diesel exhaust. I imagine the turn up would be for fitting the exhaust evacuation rig.

Never seen an up turn in drag competition.

Pavement Tested said:

For pulls, a lot if indoor competitions have smoke collection rigs so the building doesn't fill up with diesel exhaust. I imagine the turn up would be for fitting the exhaust evacuation rig.

Never seen an up turn in drag competition.

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thanks dude, i didnt actually know about indoor pulls so that would make sense.

At diesel drags, trucks are typically required to run a stack or a turn-up. Reason being, the soot from the exhaust can collect on the beam devices and interfere with the timing system. You’ve got beams for pre-stage, stage, roll-out, and 60-foot. I’d imagine the track crew doesn’t want to have to clean those beams every run, so a turn-up tip or a stack routes the vast majority of the soot away from the beam devices.
Actually not a dumb question at all… IYKYK, but if ya don’t know and aren’t racing, only way to find out is to ask!

Edit: dyno events, I’ve no idea. I’m guessing here: maybe the optics of spraying the crowd (and the very expensive dyno trailer) with soot before the turbo lights and cleans up the exhaust? Maybe an OSHA thing for the operators to avoid excessive exposure to soot?

Turn ups are to keep the pull sled clean and to keep the smoke away from the crowds also keeps people safe if oil or shrapnel from the turbo happens to come out of the exhaust