Ok got car switched over to speed density and when car goes over 8lbs of boost its like it starts to slow down and gets sluggish...almost like it quits pulling....ill get a tune uploaded and a data log...maybe you guys can point me in the right direction....a/f ratio is about 10.8-11.3 under boost....thanks

 

did you change your valve springs?

 

maybe a combination of being too rich and not enough timing???

 

running stock cam with ls6 springs....and i also tried pulling fuel and adding timing and it still does the same thing?

 

here is the tune and log... played with fuel some more and got the afr's around 10.9 at about 14lbs and it didnt do it untill around 12lbs this time...so im guessing its in the fueling....and can sombody take a look at the timing to see if it is ok