1993 Buick LeSabre Supercharger

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MARO6613
  • MEMBER
  • 2 POSTS
I know this isn't strictly a repair question, but bear with me -
A friend of mine recently came across an Eaton M90 supercharger, the modified roots type that bolts onto a 3800 - I have a 1993 Buick Lesabre with such a 3800 - in order to put on said supercharger, I am thinking I would have to take off the intake manifold, replace the gasket, and then put on the supercharger (with all the vacuum lines and bypass valve lines, I have all those too), and also probably replace the heads. Also, because the 3800 NA and the 3800 SC uses a different accessory belt setup, I would have to change out the alternator and power steering pump - other than all these things, can you think of anything else that I would need to modify/replace ? I know the 3800 SC uses a different trans, the 4t65-e versus the 4t60-e, but I am planning on keeping my trans and seeing how it works - thanks in advance!
Jun 29, 2006 at 8:04 AM
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NDDUNC
  • ✓Experienced Mechanic
  • 47 POSTS
change the harmonic balancer. Don't buy one aftermarket though as these have a wider key way, and will break upon starting or stopping! these are double pullied for supercharger [I've been down that road, $100.00-$150../trial] you'll probably have to change your pulleys also.
Dec 30, 2007 at 5:35 AM

Suggested Repair

Use an OEM double-pulley harmonic balancer made for the supercharged 3800, not an aftermarket unit, because the wider keyway can break when starting or stopping. Also plan to change the accessory pulleys for the supercharger belt drive.

Conversation Summary

The owner of a 1993 Buick LeSabre with a naturally aspirated 3800 wants to install an Eaton M90 supercharger and lists intake, gasket, vacuum and bypass lines, possible head replacement, alternator and power steering pump changes, and keeping the existing 4T60-E transmission. The expert advises changing the harmonic balancer to the correct OEM double-pulley unit and likely changing the pulleys, warning that aftermarket balancers have a wider keyway and can fail.

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