2JZ Timing Belt issues?

[JustinOlson]

Are there issues with the factory toyota timing belt? I've seen that Greddy makes a "extreme" timing belt and I was curious if there is any need for it?

 

Regards,

Justin

[Gareth]

I don't think there's anything wrong with it. The stock belt might just not be strong enough to hold up on RPMs higher than 8,500, that's why people change them for peace of mind.

 

From powerhouseracing.com store:

 

"Power Enterprise's Super Strong Kevlar timing belt is highly recommended for all Supras! Kevlar is the same material found in bulletproof jackets and the strings attaching a parachute sail to your body. Kevlar is one of the strongest materials on earth and the best material available to construct your timing belt out of.

 

Designed identical to your stock Toyota belt, this JDM piece works with any cam gears and requires no modifications.

 

We use this belt on our 1200+rwhp 8-second Supra as well as all of our road-race cars, daily drivers, and every other application. Highly recommended!"

 

(...)

 

"Made of a highly resilient polymer compound, these blue colored timing belts will not stretch at higher RPMs like the factory units, and are suitable to run with high lift camshafts and/or high tension valve springs. Don't worry about timing belt failure anymore! If you must replace the timing belt, replace it with the best available part!"

 

I think it could be useful to change the timing belt to a stronger one - after all, aftermarket belts are not that expensive compared to the overall engine build cost.

 

Tony