ECUTune Stage III twin screw supercharger sign up

[longassname]

Well I'm down here working on it.

I've got the machine shop making the new and improved tubes for bolting the supercharger up to the manifold. Instead of stock tubing used in the prototype the production manifolds will have tubes machined just the way I want them. They will be bigger around with a smaller bolt hole and have a recess in the top so that the socket head bolts we will be using (allen heads) sit flush inside of the tubes instead of bolt heads on top.

I revised the pulleys for the alternator and ac. We machined the pulley i had taken the ribs off of down to 50mm and added it as a second pulley on the back of the factory bracket along side the original pulley with the ribs still on it. This reroutes the belt for better clearance around the bump on the timing cover. A 6202 bearing was used in the pulley to begin with due to it's narrowness so it's already good for the higher rpms the pulley will spin now that it's 50mm instead of 70.

I also determined I can forgoe the add on bracket for the lower additional idlers for the supercharger belt along with those idlers. We're machining a small diameter smooth pulley to go on the same assembly the factory idler does. This makes installation easier, reduces parasitic drag, shortens the belt, and gets everything back up above factory height to avoid clearance problems with the fan. I was considering using two 6901 bearings in place of the 6301 bearing to maintain longevity at the higher rpms the smaller pulley will be spinning but after doing the math determined we can stick with a 6301. We are using skf bearings and this size bearing from them is dependable at speeds of 22,000 rpms which makes us good for 7300 engine rpms.

I'll know better shortly but I think I have clearance to step up to 6 rib pulleys and a 6 rib belt. If I can get a good price on machining a crank pulley and alternator pulley with 6 ribs would you guys be interested?