Well, although it feels like this could be possible in my 2003 STR, (DSC off and in sport mode) I plan to try several other 0-60mph apps. What do you use to measure 0-60 times? Whats your best times? STR only please. What's the best/most affordable way to test?

 

Well the published numbers are around 5.4-5.1 sec.
That is way too fast for a STR.

You have the 2003 which is known for short shifting. Does the car get to 6100 rpm in 1st before shifting?
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I use an official test, and am happy with that. Then I think of the cost of repairing a gearbox, the cost of fuel, the cost of tyres and also the time it will take me to repair the damned thing, and then I avoid these abrupt loads, - - unless of course the guy next to me needs a lesson taught.

 

I agree. But back to the point unless you managed some major hp increases and reworked your suspension theres no was the OP got a 3.9 sec 0-60.

heres my 700 hp hellcat on drag radials after much practice (and its not easy bc one mistake and its a smoke show). My best is 3.3 sec.

in my Jag I have no idea but it feels like a 5 sec time

 

check out this page
https://www.zeroto60times.com/vehicl...ast-slow-0-60/