Extreme Duty Tensioner Stud Maximum Power Builds
Introducing the ultimate solution for timing belt tensioner reliability in extreme 2JZ builds: the PHR XTM Timing Belt Tensioner Stud.
Designed for engines producing massive horsepower, where failure is not an option, this stud replaces the factory timing belt tensioner bolt—a known weak link in high power applications. Factory bolts are prone to breakage under extreme belt loads, and even many aftermarket solutions fall short. The PHR XTM Stud is engineered to eliminate this point of failure.
Why Upgrade?
A solution to a real problem
Factory Bolt Failure
It’s well documented that the factory timing tensioner bolt is a common failure point under extreme belt tension and harmonic loads.
Two Versions to Fit Your Build
We now offer two versions of the PHR XTM Tensioner Stud to suit your specific installation:
M10x1.0 Base Thread
Direct upgrade for most factory-based oil pump setups. No modifications required—simply install and go.
Substantially stronger than OEM bolt, ideal for engines seeing heavy loads and drag racing use.
M14x1.5 Base Thread
Maximum strength version, requiring modification of your factory oil pump (drilling and tapping required), or drop-in fit with our PHR Billet 2JZ Front Cover (Oil Pump Delete)—specifically designed for wet sump or dry sump race engines using this thread size.
The M14 version provides significantly greater strength and thread engagement compared to the M10 version—highly recommended for the most extreme builds.
Extended Design
The stud design provides optimal support and thread engagement, but due to its length, requires either no timing cover or modification (drill clearance hole) of your factory timing cover.
This product is intended for serious race cars where factory aesthetics are secondary to function.
Strength
A solution to a real problem
With a thread size of M14X1.5, this is a VAST uprgrade over the factory M10X1.25 thread size:
| Version | Approximate Strength Increase vs Factory Bolt |
|---|---|
| M10 XTM Stud | ~25–33% stronger |
| M14 XTM Stud | ~140–150% stronger (more than double the strength!) |
Practical Notes
✅ Even the M10 version is already a substantial upgrade—you’re taking a known marginal component and giving it ~30% more tensile capacity and far better fatigue resistance (17-4PH is much better in cyclic loading than typical 10.9 steel).
✅ The M14 version is an extreme-duty solution—over 2X the load capacity of the factory bolt. When used with the PHR Billet Front Cover, this is the choice for serious race engines seeing violent harmonics and peak belt loads.
Use Case and Proven Success
The PHR XTM Tensioner Stud is the choice of top-level 2JZ-powered race teams around the world, including:
🏆 “White Rice” — world record-holding 2JZ-powered Nissan 240SX
🏆 “Dirty Taco” — built to the same spec and record-setting potential as White Rice
Both vehicles use this stud as part of their PHR Full Send Timing Support Bracket system, which can be purchased separately or in conjunction with this stud for the ultimate in timing system reinforcement.
Even more extreme
Suggested Companion Product
Looking for even more bulletproof timing belt stability?
Pair this stud with our PHR Full Send Timing Support Bracket for maximum system rigidity and peace of mind at extreme RPM and power levels.
Specifications
| Vehicle Fitment | |
|---|---|
| Make | Toyota, Lexus |
| Model | Supra, SC300 (Soarer), IS300 (Altezza), GS300 (Aristo) |
| Chassis Code | A80, Z30, Z31, Z32, S160, S161, S147, CE10, XE10 |
| Generation | 1st Gen, 2nd Gen, MKIV (Mark 4) |
| Trim | Turbo, Naturally Aspirated (NA) |
| Fitment | |
|---|---|
| Engine | 2JZ-GTE, Non VVT-i, 2JZ-GTE, VVT-i, 2JZ-GE, Non VVT-i, 2JZ-GE, VVT-i |
| Product Specs | |
|---|---|
| Material | 17-4 PH |
| Variants | |
|---|---|
| Thread Size | M10 x 1.25 or M14 X 1.5 |
