Quote:
Originally Posted by JCruz
I think I want to supercharge, but my engine and trans have 250k miles on them.
I think id spend the money on a rebuild of those first.
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Hunt junkyards and car-part.com and see if you can snag a used one. $3500 for a new one just isn't worth it anymore, not when some 4Runners on the road aren't even worth that much!
My 4Runner enjoyed somewhere around 150K miles of supercharged fun before it started to show some wear. The extra heat from the charger will cause the valves to wear down a little faster, nothing dramatic but it does happen. More prone to cracked valves too if you really beat on it often. As far as the transmission goes, the supercharger puts out a lot more heat in the engine (normally comes with a 170* thermostat vs 190* stock) and this heat is also increased in the transmission. A good quality synthetic transmission fluid with frequent checks will keep it running smoothly. There's no inherent risk to the transmission other than heat.
My experience has been is if the compression is good in all cylinders and is mechanically sound, mileage doesn't matter. If you have cylinders with low compression or other issues, the supercharger will exacerbate them.