Is my belt slipping?

[Big50]

I went to the track last night after and I think i am getting some belt slip. I would think with my power i should be trapping 123-125 but best i could do was 120.5. I pulled a 11.56 with a 1.60 60' @ 118.5. I made a quick video on the way home of my boost gage. It looks like it goes strait to 13 lbs and then after a second it starts flickering and won't build to 15 which the pulley is good for.

http://s290.photobucket.com/albums/ll252/biigg50/?action=view&current=54fae159.mp4

 

[94tbird]

lots of things affect boost, like the weather. the hotter it is, the less boost you see. I can see 14-16psi on the same pulley with no change other than the outside temperature

 

[Big50]

So, from the video it doesn't look like there's any belt slip? When i got it tuned they said there wasn't any.

Ya, understand when it comes to peak boost. I just would think my trap would be a lot higher. I pulled a 11.58 with a 1.71 60' @ 119.6x with my 13 lbs pulley. I went from 497/467 to 526/534 and added a trunk mounted intercooler reservior that was packed with ice. I just figure i would see some bigger gains.

Although my 11.58 pass on the 13 lb pulley was made when with a DA of -1270 vs. the -45 it was yesterday. Oh and the only different thing in my set up is I went to the 26x11.5-17 et streets bias ply vs my 305-35-18 nitto dr's. The mt's are about .7 taller tire as well.

I also noticed i lost about 3 mph on the 1/8th.

Here's my slip from last night:

My old slip from the 13lb pulley

 

[eyeeatrice]

mark your belt with a marker with a line in relation to the pulley and see if it moves.

 

[19COBRA93]

mark your belt with a marker with a line in relation to the pulley and see if it moves.

Lol, what? That's not at all going to work like you think.

There are so many factors that effect MPH. You've made some changes, the weather is different, the squishier tires you're now running absorb some top end power as well. Too many variables to say what's going on. I'd say it's just a combination of a lot of things.

 

[01yellerCobra]

How much weight did you gain with the bigger intercooler tank full of ice?

Misspelling brought to you by tapatalk