Hi Guys/Gals
Not much to compare in my local area but I'am wondering if anyone can offer information on what to expect with my 2007 GT/CS auto 'vert. (5000 miles on car)

race history (with street tires) (no TCS / O/D off) leaving car in 'drive' for run.
bone stock = 14.187 / 97.65 mph
first add-ons -Cervini's ram air hood kit /4.10's = 14.045 / 100.21 mph (little disappointed)
latest - Brenspeed custom tune/93 oct = 13.541 / 101.83 mph (big gain here!)

Car seems to be going flat within 6-8 lengths of finish line, seems to lack fuel. I think maybe a higher volumn pump or injectors would help.

I would appreciate any feedback for theses numbers or what it should be. Looking for streetable high 12's

Pending - Drag radials / possible 3000 stall / CAI inlet pipe /

Bryan

 

Have Brenspeed tweak the tune to lock-up the torque converter sooner (1/2 second after upshifts at WOT), lock-up the torque converter in 3rd/4th/5th (not just 4th/5th), increase the transmission line pressure (about 50% more than stock is my preference), and turn off the torque management (they likely already did). Your not making nearly enough power yet to need a bigger fuel pump or injectors.

CAI's are a waste of money performance-wise, but look cool. Bolt on some drag radials to eliminate any traction issues. Stall converter works wonders in our cars (my ET's improved 3 tenths of a second before doing any tuning to make the most of it). I recommend going with a converter that flashes to 3500-3800 rpm's to get closer to the peak torque, but 3000 rpm's will be better than stock. Long tube headers and high-flow cats will really wake up your trap speeds (roughly 3-5 mph improvement).

 

Thanks Brian

I will talk to Brenspeed about the lock-up timing, is the trans pressure controlled by tuner adjustments?

I also forgot to mention in my comments that my 60 ft times on stock street tires 1.39 - 2.10.

Regards

Bryan C

 

Thats 1.89 - 2.10 = 60 ft

 

Trans pressure is only accessed by tuner software - can't do it with the hand held tuner. I went way too high initially and it would spin too hard on the 1-2 & 2-3 shifts, and bark hard into 4th. Dialed it back to keep the car straight on the street.

 

Brian

Thanks a bunch for your input

B

 

That's actually quite good for street tires! With the stock converter and street tires, I was lucky to get 2.1's. On drag radials and with an aftermarket converter, I'm consistently pulling 1.73-1.79 60' times.