1/4 mile time with top up vs top down ?

[ThreePedalPlow]

Just curious what you think the difference in 1/4 mile times would be with the top up vs the top down. Motortrend ran a 12.2 @ 116.8mph in an automatic transmission car. I'm assuming this was with the top up. The car feels significantly slower to me when the top is down once speeds increase. The way the leather in the back seat shifts around at speed leads me to believe a tonneau cover may help with this quite a bit.

Sponsored

 

[robvas]

Would love to see a back to back dragy test 60-130 isn't the same as a 1/4 mile but it would still be a good test

 

[ThreePedalPlow]

Would love to see a back to back dragy test 60-130 isn't the same as a 1/4 mile but it would still be a good test

I was thinking the same thing. I don't have a draggy. I thought it was just an app but I think there is some hardware involved too.

 

[Zig]

Don’t forget windows up or down when top down?

 

[ZBOBMAN]

How about the top half down? Just kidding

 

[Zig]

How about the top half down? Just kidding

That’s just for when ogling ..

 

[TheCur]

I was thinking the same thing. I don't have a draggy. I thought it was just an app but I think there is some hardware involved too.

No there's a actual unit, it's about 1" x 2" x 3" and weighs maybe 6 oz. that connects to your phone. It's neat. 4 car guys (incl. me) all chipped in $25 and bought one to play with. Regchargable battery inside that will last quite a while.

To the OP's question: I saw negligible differences in 0-60 times in my 17 SS convertible when I tried it back to back a few times, but I somehow suspect that difference in aero starts playing a much bigger role as speed and drag go up.

 

[JimC]

Some friends and I have been doing a track rental for 15 years (very sad though, the track canceled our reservation this year just a month before our scheduled day).

Since it is a private rental, they have let us do a lot of things - like the year 2 of us took our mountain bikes down the track. They also let us go with the top down on our convertibles - at first just 2 of us who had roll bars, but then they allowed all convertibles to make a pass.

With the top down we lost about 0.2 in the 1/4 mile as I recall. Can't remember the effect on the MPH.

But making a pass with the top down was a lot of fun!

 

[TripleshotMcC]

I used to run my 2015 up to 120+ on a road near my home where I have clear line-of-sight for 2.5 miles. Was solid as a rock and very fun.
My 2024's windshield starts to shutter pretty badly at anything over 80 and putting up the windows doesn't help. When the top is up, she's ready for 125, but not topless.
Anyone else experience this?

 

[Vapor Blue GT]

I used to run my 2015 up to 120+ on a road near my home where I have clear line-of-sight for 2.5 miles. Was solid as a rock and very fun.
My 2024's windshield starts to shutter pretty badly at anything over 80 and putting up the windows doesn't help. When the top is up, she's ready for 125, but not topless.
Anyone else experience this?

Top down at 100 and no windshield vibration that I noticed. It was only to get around some slower cars so it wasn’t at that speed for more than a few seconds

 

[jeffnudi]

I used to run my 2015 up to 120+ on a road near my home where I have clear line-of-sight for 2.5 miles. Was solid as a rock and very fun.
My 2024's windshield starts to shutter pretty badly at anything over 80 and putting up the windows doesn't help. When the top is up, she's ready for 125, but not topless.
Anyone else experience this?

Top down and over 90 a few times for several miles and no shake at all.

 

[seanpublic]

My 2024's windshield starts to shutter pretty badly at anything over 80 and putting up the windows doesn't help. When the top is up, she's ready for 125, but not topless.
Anyone else experience this?

Mine does the same at 90 and over. I have the same car as yours with performance package and magneride. No vibration in steering wheel or seat, so I don't think it's wheel balance or drivetrain.

 

[Pmamba]

Mine does the same at 90 and over. I have the same car as yours with performance package and magneride. No vibration in steering wheel or seat, so I don't think it's wheel balance or drivetrain.

I have a GT premium, PP, magnaride and have not noticed any windshield shutter or vibrations at all. I have pushed it over 100.

 

[TripleshotMcC]

Mine does the same at 90 and over. I have the same car as yours with performance package and magneride. No vibration in steering wheel or seat, so I don't think it's wheel balance or drivetrain.

I agree in does not seem to be related to alignment or suspension issues, nothing vibrates except the windshield.
Wonder if there's anything that can be done about it.

Sponsored