Supercharger Clutch Engagement

MacGyver · 11-23-2008, 02:24 PM

Hey guys, i'm not an MR2 owner but am considering using an SC12 or SC14 for my project since it is clutched. My plan is to have the supercharger disengage at 3800-4500 RPM and engage at ~1500 RPM. I've heard rumors that disengaging the clutch will cause damage, is this true? I'm also curious what the duty cycle of the clutch is in terms of how often it can be disengaged/engaged without causing damage. Thanks!

Jackstand Queen · 11-24-2008, 11:19 AM

Oh, you are working on a SC/Turbo twin charging setup. Hmmm that's ambitious. The SC12 & 14 clutch pulleys are different, but they are interchangeable too. A yota dealership sells them for about $500. They have a brake shoe type friction surface on them, and the electromagnet in them clamps the pulley down and engages the SC, or releases it. This process is subject to normal wear and tear. I can't think of any reason to worry about them wearing out prematurely.

mr2tim · 11-30-2008, 10:02 PM

I have used my stock S/C car in competition for 19 years. Never ever had a clutch problem in over 250,000 miles. How's that for reliability?

You could wire the 2 wire electromagnetic clutch to a drag type "brake switch" on your shifter and make it work when you wanted. Getting it to kick out at a preset low RPM (3-4K) like you want sounds like more of a challenge.

My car idles at 900RPM and when I stomp it the clutch is engaged immediately so low RPM is not a issue either.

BTW I've noted that if the clutch facing is dry or oiled it still functions the same.

Go for it dude, I see no reason your idea can't work from the experience I have had.

Write us back when you get this project moving along, we're all waiting to hear how you do with this idea?

Supercharzed Toyz Race Team

11-23-2008, 02:24 PM	#1 (permalink)
MacGyver No Skills Join Date: Nov 2008 Posts: 1 Thanks: 0 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	Supercharger Clutch Engagement Hey guys, i'm not an MR2 owner but am considering using an SC12 or SC14 for my project since it is clutched. My plan is to have the supercharger disengage at 3800-4500 RPM and engage at ~1500 RPM. I've heard rumors that disengaging the clutch will cause damage, is this true? I'm also curious what the duty cycle of the clutch is in terms of how often it can be disengaged/engaged without causing damage. Thanks!

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11-24-2008, 11:19 AM	#2 (permalink)
Jackstand Queen Cage Fighter Join Date: May 2008 Posts: 677 Thanks: 52 Thanked 56 Times in 53 Posts iTrader Rating: (1/100% )	Oh, you are working on a SC/Turbo twin charging setup. Hmmm that's ambitious. The SC12 & 14 clutch pulleys are different, but they are interchangeable too. A yota dealership sells them for about $500. They have a brake shoe type friction surface on them, and the electromagnet in them clamps the pulley down and engages the SC, or releases it. This process is subject to normal wear and tear. I can't think of any reason to worry about them wearing out prematurely.

11-30-2008, 10:02 PM	#3 (permalink)
mr2tim SUPERcharZed ToyZ RacZer Join Date: Mar 2008 Location: South Florida Posts: 690 Thanks: 2 Thanked 41 Times in 38 Posts My Google Map iTrader Rating: (2/100% )	I have used my stock S/C car in competition for 19 years. Never ever had a clutch problem in over 250,000 miles. How's that for reliability? You could wire the 2 wire electromagnetic clutch to a drag type "brake switch" on your shifter and make it work when you wanted. Getting it to kick out at a preset low RPM (3-4K) like you want sounds like more of a challenge. My car idles at 900RPM and when I stomp it the clutch is engaged immediately so low RPM is not a issue either. BTW I've noted that if the clutch facing is dry or oiled it still functions the same. Go for it dude, I see no reason your idea can't work from the experience I have had. Write us back when you get this project moving along, we're all waiting to hear how you do with this idea? Supercharzed Toyz Race Team