Ira Blumberg

This C&D test says the 4S goes 11.5 @ 121 in the quarter stock: http://www.caranddriver.com/reviews/...4s-test-review


Most people have difficulty matching C&D's times. While I think the trap speed is lower than expected, the 11.1 is a full 0.4 second improvement in E.T. This suggests an increase of at least 40 HP.


Obviously it would have been preferable to have before and after runs on the same day at the same track for the most accurate comparison. Nonetheless, a repeatable 11.1 E.T. is impressive. I would say that is not a miniscule difference and everyone has their own level of risk tolerance.

freddiemac

Ira, there are too many variables in ET.. The same car can easily be 0.5 secs slower/faster on a colder/hotter day, diff tires/track, etc.. While trap will likely be similar.

Thus the trap speed is always the preferred indicator of actual hp applied.

mac10

Maybe you should read and understand the entire piece, instead of just interpreting part of it to justify your personal rhetoric.

The car ran a consistent 11.1 with my novice hands at the helm and with the wheels spinning during launch control at the start, I feel like the car could break into the 10’s(93 pump gas) on a cleaner surface.

9914s

Wow lots of internet racers. Magazine times and real life times are not comparable at all. Good job OP.

Ira Blumberg

Generally, I agree. However, it is extremely rare to see a novice beat or even equal E.T.s reported by C&D. Thus, in this case, I am willing to accept that the mod did indeed knock about 0.4 seconds off of a very aggressive E.T.


There are many possible explanations for the lower than expected trap speed. For example, the ECU could have been forced to pull timing at the top end in higher gears due to detonation. Perhaps with better gas or less aggressive tuning at the top end, the trap speed would be even higher.

P-car fan

EXACTLY!! And the fact that it was OP's first time at the drag strip is big as well. Anyone commenting in this thread saying that the gains are negligible seriously does not understand real world circumstances!!

sticky

Not sure why people don't understand that magazines aren't getting timeslips but using GPS.

That inflates their trap speeds.

The huge ET gain shows a huge torque gain down low. As it so happens, this correlates with the released 991.2 GIAC Carrera tune dyno of +100 lb-t at 3000 rpm.

sticky

You have no idea what you're talking about.

sticky

What does reaction time have to do with anything?

Also, please post your slip.

mikex25

not sure he understands timer starts after you cross the starting line.

9914s

PDK?

Dewinator

Hmm are you sure?

Yep PDK SC. I'm a bit confused about all the comments of real world conditions and being a first time and everything, especially if as Mike says the timer starts when you cross the line. LC seems more like and amusement park ride than anything else to me. I didn't really do anything.

I'll look for the slip, I'm sure it's in a box somewhere.

mikex25

it is true after the light turns green you can sit there for as long as you want and the timer won't start until you cross the starting line. Reaction time is only for head to head races.

Dewinator

It was head to head as in there was another car racing next to me if that's what you mean.

mikex25

http://www.dragbike.com/the-starting-line-how-does-reaction-time-affect-a-runs-et/



please read second paragraph "how does reaction time effect affect ET"