When I run my car, I usually see a trap speed around 104-106mph. What kind of quarter mile times do you usually see with this kind of trap speed?

 

a lot will depend on the weight but usually thats a low 13 or high 12

 

low to mid 13s

 

also keep in mind that the faster your ET gets, the mph usually goes down...
ie.. run 14.9@106 might run 13.5@102

 

whoa thats crazy. I thought it was hand in hand as time decreases, speed increased. hmm, makes me wonder. i guess its due to the cars ability to accelerate longer to have the higher mph. is this the general rule of thumb?

 

on one of my old street cars, I ran a 12.8 at 105 mph

 

It has alot to do with what you get in the first 1/8 mile...

 

My car did
12.9@107
12.8@105
12.7@103

every tenth i went down in E.T. I lost 2mph

 

traction plays a issue, depends if you are running street tires or slicks.

 

I think moroso has a 1/4 mile/trap time/ET/Hp chart that can convert all of those things to Hp and vise versa.

 

Its all about the hook. I went 12.9@105 na. Same car with some practice and a warmer track went 12.6@106.
This was about same air temp but the track was warmer so the car was hooking better 60's.