miata lap times with top up and down (different)

[962porsche]

have any one ever taken there lap times in a miata with the top up and the top down to see if there is any difference between then .
i would not think there is any ?

[paultg]

google is your friend.

From what I recall there is a difference, airflow is more turbluent with the top down, so lap times are slower.
So you can leave your top down essenstially and use that as an excuse.

[962porsche]

i did google it and got some different answers .
i'm looking for some one how really did it them selfs to see .
i would think at a track like nhms that no you would not see a change in lap times but at a track like say the glen you could ?

[breakaway500]

Top up has always been slower in my Miata...mainly because the track would be wet...

[Grippy]

IIRC at the Glen the top up was worth 5MPH on the back straight. The hard top is a bit better than the raised soft top. I might be off a bit as it was a few years ago when I ran a soft top.