I have a spare OEM pulley and I intend to measure it and draw it up as best I can in CAD. It is just an exercise in the design of a smaller pulley. I can't see myself taking it apart too much though.

The secret of the design is the springs, the accuracy of the rivet holes and accurate assembly using rivets. The bearing is a critical member but basically easy to fit.

The smaller pulley (62mm) uses a smaller bearing and smaller bearings can do higher revs which are not needed here. Generally they also have smaller load carrying ability and that may be the weakness in the pulley. Using a pulley wrap kit will make that worse if done wrong.

 

That's what I was thinking. You may want more wrap but no additional pressure/tension on the pulley.

 

Would you buy a clutch disc with flush rivets? How 'bout brake pads? Those pulleys are doomed to fail or destroy the friction pad on the SC clutch magnet.

 

Everything depends on the hardness of the materials used and the required galling that is needed to make everything work. Those rivets are far softer than the clutch they are pressed into so to say that it will cause damage is incorrect and I wouldn't run something on my car that was going to cause damage to anything other than the tires. LOL

 

Hey guys and gals, I was unable to get the printed dyno runs scanned and loaded onto my computer. However, I was able to get some software to be able to open the files from the runs. I have posted a picture of the HP with the new 62 mm pulley, tune and DCAI. I was unable however to get the torque to show up as it did on the printed page I was given. The same is true for the A/F ratio. I am still working at it and will post it asap. I have the files and if anyone is able to use winpep I will be more than happy to email them to you to post for everyone.

 

OK, finally got the torque to show up. Here it is.

 

and the A/F. I am on a roll Jerry made one more tune to the car which I did not get to put back on the Dyno and look at. I will go Monday or Tuesday to have more tuning done if Jerry does not like where the tune stands now.

 

just wondering what HP and Tourque numbers you had with the 65mm pulley compared to the new 62mm. Would like to see what difference it actually puts out. Any issue with belt slippage so far? i have DCAI, 65mm pulley and tune done, so far no issues

 

for some reason the bmp file wont download for me....others?

 

no issues with belt slippage. Sorry but no dyno numbers for the 65mm pulley

 

Right click on the thumbnail, click on OPEN LINK then hit OPEN. .

 

hoooohaaaa.....364bhp....!

 

Awesome! Where can I get one?

 

Nevermind. Found it on the 1st page

 

one of the runs was over 370

 

change the bottom data from mph to rpm. its easier to compare with other graphs

 

Minor correction; 364 RWHP!

 

awesome data! I have the latest EC SC pulley (65mm) and it creates a lot of extra heat. Have you had longer trips with your car without having the front bumper to melt down?

 

I installed mine (62mm) last night and it seems to have a little less bottom end then my 65mm pulley.....but the mid and top end have more butt dyno feel for sure. No enough difference to say it makes a huge jump from say the stock pulley to the 65mm....as that was a big difference.

 

I wonder what kind intake and cooling mods do you have. Did you re-tune the ECU?