Running around with a supercharged 2005+ Mustang with the stock serpentine belt tensioner? You haven't had any problems with it yet, but you've heard of tons of other people bending, and sometimes snapping, their stock tensioners, even factory supercharged Saleen and Roush vehicles. It starts as a squeak, typically first on stick shift cars, then progresses to a chirp, and boost loss, then shredded belts, tossed belts, and even an occasional tensioner arm that completely snaps off.
But you don't need to worry about it, it won't happen to you, right? :roflmao: Your car is special.
Rather than wait for it to be a problem, be a responsible car modifier and do some preventative maintainance. Not all tensioner issues start with the belt squeak to give you a warning; some go straight from not being a problem to being a two piece modular tensioner. Is it worth a few bucks to possibly have it screw up some pullies or have a chunk of that smash the hood or something on the front cover?
Belt slip = boost loss = lost power. What people usually forget is that with less boost, you're also getting lower fuel pressure. Lower fuel pressure at high rpm causes bad, bad things. As good as your tune can be, if your mechanical isn't there to support it, the setup is no good. If your tuner is expecting 9psi up top and you're only getting 7 or 8, it's going to throw the entire tune off.
Roush tensioners are $189.00 through JDM for these first 100 units. Pricing will go up significantly after that.
In addition, JDM Engineering is now
offering a LIFETIME GUARANTEE
on these units. If you break it, we will send you a new unit (you cover shipping and handling). We'll do our best to help you diagnose your squeal/slip/chirp/break, and if we believe it is the tensioner, you get a new one regardless of your power level. Whether you are running 8 psi or 45 psi, 400whp or 7000whp, you break it, we'll replace it.
JimIII@JDM