Originally Posted by maudyZ28 (Post 428916)

Well, after the weekend at the drag strip I was really gutted on the first day when after LS6 intake, 3" true duals, LT headers and a bit of EFIlive tunnning I only got a 13.12 after my previous best of 13.24 (albit on a different track)

Anyways, on the second day and after lowering my spark table (stock 99 z28 is well advanced and runs rich) i pulled a 12 sec pass on my second run, and with street tires and a poo 0-60ft time

Here is it:

0-60ft : 2.0437
1/8 ET : 8.4299
1/8 MPH : 84.72
1/4 ET : 12.9718
1/4 MPH : 106.58

This track is not the best in the UK, I had to set off on 50% throttle to get best launch, and also the 1/8 times and MPH values as different depending on right or left side of track, RH side is always about 4 mph faster than left, on same ET at 1/8 and 1/4

But still pulled a 12, just, and was running 13 flat all day, could have got another couple of 12s I think but was in bracket series and had to back off so I didn't break out

Originally Posted by maudyZ28 (Post 429808)

ss_2000, dude im sure you'll easily get into 12 with the 3.73s, providing you can get power down. I tried a ball out launch at full throttle after the green and it just spun up all the way to 2nd, got a 14.5 on that run hahah :) Yeah still 2.73 gears and have to lauch at 50% throttle

kissmytush, well the stock pcm parameters command 11.7 : 1 fuel ratio, but optimum is more around 13:1 to 12:1, so I set mine at 12.6 (dont know how accurate it is exactly as i dont have a wide band yet) but I check with a 2002 camaro tune and that runs about 12.5 ish so i cant be that far out. PLus most tuners say they keep the stock MAF as the calibration changes depending on this

Originally Posted by KissMyTush (Post 429875)

Ok, I have a SLP Mass Air Flow sensor could that fix this? How do I check it to see what I am running?