i bet you will get better times with a 75 shot,
the bigger shot doesnt mean faster times.
n/a my old combo ran a 14.7 most of the time
when I first used my zex kit I was afraid of breaking something, so at first I was running 11 deg timing and 42psi fuel.

my best time was a 14 flat at 100mph.
I raised the timing to 14 degrees and the fuel at 40psiand I got a 13.7@102mph.

but as I got used to it I decided to run the 100 shot,
I got a 13.2@107mph,
then I was just waiting for my new motor to get to me, so I decided I dont care if something breaks, I ran the 125 shot, and I ran a 13.6@107mph.11 deg timing and 40psi.


the 125 shot made me spin bad in all shifts especially 3rd-4th.

I was only on street tires too, and only 235-60-15's.

work on your 60 ft times too, to get a good launch, ride the clutch.
start at 4k rpm and then slowly release it and as it grabs give more gas at the same rate it grabs.

it worked good for me, with stock gears I got a best 60 ft time of 1.98seconds.

 

ya they call them fuel jets in the kit but i know its for vack, you ran the same as me 107 on a 100 shot, i guess im just going to have to keep trying different way to lonch better, thanks for the info.

 

Thats not too good. You need to fix them traction issues. Instead of investing in a 125 shot, stick with the 100 and get yourself some good tires.