Thread: 62mm SRT6 Pulley Available Now
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Old Aug 13, 2012 | 09:39 PM
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onehundred80
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Default Re: 62mm SRT6 Pulley Available Now
Originally Posted by rcompart
I've received a few PMs and emails in regards to shims and the clearance of the clutch. This was very important when the pulley was designed so it wouldn't have the problems other pulleys had. I've included the instructions for those that didn't see them in the other thread.

1) Install with 1 OEM 0.33mm shim only. Do not add more shims to it.

The leaf springs are stronger than OEM so the gap between the plate and the clutch must be closer in order for the magnet to have an effective suction on the plate. The pulley will not engage fully if the gap between the plate and the clutch is 0.4mm or greater.

2) Drive your car normally for 50 miles to set the gap between the plate and the magnetic clutch into the correct position. Your car is drivable before the ECU tune.

After installing the pulley with 1 OEM shim, the gap between the plate and the magnetic clutch may be more than 1mm. Let it be, it will set into the right position after 50 miles. After that, you will see that
the plate is very close to clutch(less than 0.3mm).

3) Tune the ECU. Do not tune the ECU before pulley is mounted and broken-in correctly because pulley will not fully engage.
I have read about this new pulley with great interest and there are a few questions that I have that I cannot see the answers to.

From what I have read the OEM pulley required different size shims to suit the particular pulley supplied due to manufacturing tolerances of the SC shaft, the clutch and the pulley. So wouldn't the initial pulley fit be better using the shim(s) that the were used with the OEM set up?

If the gap could be greater than 1mm on the initial install and the attraction of the magnet cannot overcome the spring tension and there is slip or no contact what would the effect be on the SC performance for the initial 50 miles?

If one can expect that the gap will decrease from greater than 1mm to 0,3mm then the so called springs are not really springs at all as they will have been stressed beyond their elastic limit and will not return to the original position on the plastic stops. That they are not on the stops is no great loss but how many cycles can they be expected to flex after that without getting closer and closer to the clutch? Steel that flexes constantly without the proper heat treatment to give it the properties of a spring will fail sooner than a true spring that is not stretched beyond its limits.

The use of the spacer indicates that a different bearing to the OEM bearing is being used, if so what are its properties with regard to load and RPM, smaller bearings tend to have higher RPM limits but take less loads. I imagine that a PSK will put more load on a bearing and would reduce the life of the OEM bearing let alone a smaller one. How long can this bearing be expected to last and are they readily available off the shelf.

With what you have said previously the riveting of the springs is being done as it should be, as the riveting process, the tightness of the rivets in their holes and the accuracy of the rivet hole positions is vital to the success of the pulley. The quality of the product is obvious to the eye.

When you mention the tune is it the Speed Driven tune that is required to get the most from this mod or can those with other tunes just get an update?

 
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