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I did do more coast down testing as now roads are frozen/dried out.
Cd = 0,362654627
CRR = 0,013188244
There are bit room for error as road had uphill at both ends, rather slight and also tiny turn too, several cracks on road and generally very bumpy road surface.
I did only three drive back and forth as it was already past midnight, but there was no single other car out there.
Results might be better if I would do two series of six test so that car would warm up, it was below zero so it takes bit of time to car to warm up and start moving properly.
Anyway I found out that it does coast a lot better than what it did at daytime, certainly wet road surface causes a lot of rolling resistance with my tires.
Now I have at least base where to compare when installing mods.
I hope to make mods so that they would be easy to take off and put back for testing, but how to attach them to achieve that, is still bit of mystery to me. Maybe I just drill holes and put those bolts where other end is smooth and round, I can put wing nut to other side or nylock nut. It might be just tad difficult to drill completely trough the trunk door, it has so small frame around window and as it is some form of plastic/composite it might not be strong enough for that.
Hood is no issue (wiper cowl) same for front bumper.
Rear seats I take off soon, had bit of accident and managed to have coolant canister leaking to seat for few days, so I think seats are useless now, at least I can now change car taxation class for cheaper.
Intercooler air pickup is from upper two grille holes, I can perhaps block partly/fully two lower grille holes from upper grille, but for better effect, maybe I should try and move intercooler air pickup to lower grille where are those two places not blocked up yet?
Intercooler is at top of the engine and cooling effect is by ram air kind, faster one drives, more air goes trough intercooler. I wonder what location might provide least restriction while maintaining airflow?
Sadly intercooler is made so that it is part of intake manifold, so I can't relocate it, it would be easier to manage airflow to it if it would be at front.
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