S58/B58 Gen2 Exhaust Cam Blocks

The Wait is Over! Our S58/B58 Gen 2 Cam Blocks are here and in stock ready to ship.  

For those looking to make power with a single turbo and or a built engine running high boost, many will run into the issue of having their exhaust cam drift or walk backwards. Something a tuner will be on the lookout for and you will hit a limit.  So we have designed these cam blocks to help prevent "cam walk" and allow the tuner to be able to dial in your car without this sporadic issue.  This is written with the S58 in mind but it applies to the B58 as well.  Yes B58 only has 1 HPFP vs the 2 the S58 has, but the problem is the same.  So below is what happens and this is one way to prevent this from happening. 

Exhaust Cam Load: On the S58, the exhaust camshaft is responsible for driving two high-pressure fuel pumps. When the engine is tuned, especially with stiffer valve springs or higher fuel-pressure demands from upgraded HPFPs, that extra mechanical load can exceed what the VANOS system can comfortably control. The result is exhaust cam timing drift, often referred to as cam walk.

Fuel-Pressure Variability: As cam timing begins to wander at high load or high RPM, the HPFPs are no longer driven in a stable, predictable pattern. Fuel pressure can sag or oscillate, which leads to inconsistent AFRs and forces the DME to intervene with timing pulls or throttle closures to protect the engine.

Erratic Engine Behavior: With cam phasing and fuel pressure both fluctuating, the engine becomes less predictable overall. At elevated power levels where precision is everything, this instability can undermine both performance and long-term reliability.

Priced only for the cam blocks, we will be soon offering the cam vise plate to help make the reloading of the spring easier.