Racing at night?

[Alley]

Hello! I'm wondering if there are cars testing the track on Belle Isle? I'm in GPP and have heard LOUD, revving engines the past couple nights. It seems way too loud to be regular cars or motorcycles

[Former_Detroiter]

Perhaps they're practicing.



http://detroitgp.com/eventinfo/

WHEN:
Friday-Sunday - June 2-4, 2017

WHERE:
The Raceway at Belle Isle Park road course

TRACK LENGTH:
2.3 miles