First off I'm not even sure I have the mid-pulley but it looks like it's about 68.3mm. Down low there are some great gains according to the but dyno. Punch it and be careful you don't snap your passengers kneck. I'm hitting 15#'s of boost almost instantly. Bad news is I was only peaking 16#'s. I'm thinking the new gator back belt might be slipping. I only had time for a few runs tonight. Maybe it needs to break in a little? I will try and do some more testing tomorrow and if I keep getting low boost I will probally ditch the gator back and try the stock belt. I also have a lot of wiring to do. I don't think I'm gonna make it to the track this sunday, but if I get everything sorted out I will be competing at Import Face Off next weekend.

 

Wow, with 178mm crank and 68,3mm SC you are bigger than 185mm now...
Are you leaking boost somewhere? Normally you should be over 20PSI with this Pulley-Configuration. Good luck!

 

HEY SRT ARE YOU ALSO RUNNING THE BELT WRAP KIT FOR THE SETUP YOU HAVE ? HOPE EVERYTHING GOES WELL FOR YA. BRANDON HAS NOT RETURNED MY E-MAIL YET. ILLCYA

 

I bet you are having belt slip. The only time I ever had a boost leak was from a worm clamp on the y pipe slipping off. That is about the only place large enough to bleed off that much boost.

 

Yeah, if my measurements are correct the supercharger would be spinning about 500rpms faster than the 185 at 6k. I need to get ahold of brandon an find out what size the pulley is supposed to be.

 

Iam hitting 20 at the manifold with my 178 on the street. You need to look for the air loss, something is going on there, good luck W

 

Boost leak was my first thought. I replaced the intake manifolds last week and put the needswings catch can on and was getting what I thought was a vacuum leak. Hooked the computer up and got no codes and was hitting a full 18.5#s. Needswings said it was probally the catch can or manifolds echoing.
When I saw 16#'s peak last night I too though boost leak, but I haven't done anything to create one, so since I put a new belt and smaller pulley and only hitting 16#'s I'm thinking belt slip. I'm gonna put a few more miles on it today and see what happens. My friend told me the mustang guys have had problems with the Gatorback belts and to see if I can find a Gates belt. I might just pull the belt wrap kit off and go back to the stock belt.

 

update:
It's definetly belt slip and probally my fault.


Either the belt jumped or I am just an idiot and lined it up on groove off So I just took it for a quick spin. OMG! It feels awsome and pulls so hard and it's almost 80 degrees outside right now. I will hook the computer up later and get some boost readings. AF looks good so far. I'll have to keep an eye on that belt since it burned quite a bit off.

 

Glad ... no, not glad ... relieved to hear it's installer error and not a real problem. If you can borrow a dial caliper lots of people would like to know the true size of the new pulley.

(I love photos, thanks for taking them)

Les

 

Just found out I am missing one of the three Idler pulleys that come with the belt wrap kit. So my flub and this missing pulley are a good reason for the belt slip. It's pulling like a beast right now as it sits. More testing tonight. Stay tuned.

 

HEY SRT WHEN I E-MAILED BRENDON AFTER I RECEIVED MY MIDSIZE PULLEY AND WRAP KIT I ASKED ABOUT MISSING SHIMS AND 3 RD MISSING PULLEY FOR WRAP KIT, HE E-MAILED ME AND SAID YOU DON'T NEED SHIMS WITH THE NEW PULLEYS. WITH THE MIDSIZE & 178MM CRANK SETUP YOU USE THE 2 PULLEY WRAP KIT. ILLCYA

 

Ok I C. You are right. Only two pulleys for belt wrap kit for me. DOH! I guess it was all my fault.

 

OMG is the belt wrap kit a smooth pulley that holds the belt down to get more wrap?? If so I fear to know the rpm on that sucker, its like 45 of 50 mm so its biggy time faster than supercharger?????????????

Do I have that right???????????? I can not believe thatif so. I was making a wrap kit but it was with a MUCH bigger pulley to get the push down , found that I did not need it afterall and stalled on that project. Another one in the dust bin for now.

Woody Wekend night #2 be safe...........

 

Hit 20#'s tonight in 70 degree weather, intake temps were around 150 on the first pass but peaked 170 after a few multiple pulls. Bad news is I am still getting a lot of belt dust build up so it's still slipping or rubbing somewhere. I am pulling the belt wrap kit off tomorrow and putting the stock belt back on to see what happens. The gator back belt is pretty ate up now anyway. I was told by several people to get a Gates belt so I might try to find one.

 

WENT OUT TO NAPA AND USED THEIR CALIPER TO MEASURE MY MIDSIZE PULLEY 2.70"= 68.580 MM. I COULD OF SWORE I HAD THE SMALLER PULLEY UNTIL I USED THE CALIPER TO MEASURE. SORRY IF I MISLED YOU SRT, JUST TRIED TO SAVE YOU SOME EXTRA TIME AND WORK. HOWS YOUR TESTING GOING ? WHAT ARE YOUR A/F #S ? DID YOU SOLVE THE BELT PROBLEM ? THANKS FOR THE INFO
ILLCYA P.S. OEM PULLEY 73.66MM,MIDSIZE PULLEY 68.55MM
ORIGINAL CODE 3 PULLEY 65.27MM. PER BRANDON.

 

Put the stock belt/configuration back on. Making 19-20#'s(60-75 degree ambient) AF ratio is 11.8-12.5. Intake temps were running kinda hot tonight(75 ambient) Peaked 157 after a couple pulls to 100mph. Dropped to 115 at cruise speed and some time later fell to around a 100. I ran my 1/4 mile program which is usually pretty accurate on trap speed, but not ET. I did a very mild launch in D mode and trapped 113mph. To bad I sold the hoosiers because I can't launch on the street without blowing the tires off. If I can get it to stick at the track I'd expect that trap to be about 2mph higher.

 

We need to start talking about the Code3 pulleys by their size, like we do for the other pulleys. I think it avoids a lot of confusion.

65mm = original
69mm = mid sized
74mm = stock

 

original:2.559 inches
mid-size: 2.716 inches
stock: 2.913 inches

in case anyone wanted it converted from mm to inches.
1 millimeter = 0.0393700787 inch

 

So, as i understand you do not happy with COD3 wrap kit? and suggest to use original wrap kit?

 

Thanks for the three sizes listed. I have one of the first batches made so assume it is the 2.559 and am confused. Brandon told me that I should use the two pully wrap kit. I told him I have the original smaller S/C pulley and stock belt. This is not making sense. I have not had time to install it yet. Any thoughts?