I have the same problem with my SVT, I have only been driving a manual for 2 weeks now and I think there is alot to learn on properly launching these cars. Your 60 foot times make or break the race, if you bogged off the line that would be the reason for not getting a better time. I cant really give you much advice because I am still trying to figure out how to launch this car myself!!!!
I am going to go to the 1/4 track and just experiment on different take offs the whole day until I find out how to get the best time.
These cars (focus SVT)are supposed to capable of 15.7 in the quarter according to most magazine reviews & forum posts, some people even say 15.2 is possible.
Try reading halftimes SVT 1/4th tips, its very helpful its in the 'how to' section.
What rpm did you launch at??? I launched at 3700rpm but I still had about 20 feet of wheel spin so I must of messed something up...
17 inch O.Z. Racing Ultraleggera Rims