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[Web Creator] [LMSOFT]
Exhausts

Exhaust systems are crucial to engine performance and engine efficiency. If a standard engined vehicle has a correctly modified exhaust, the result will be increased power. Bigger is not always better. Care must be taken when exhaust diameter size is selected. For example, A V12 Jaguar has an exhaust that is tuned to the engine. If this exhaust is removed completely, the car will have very limited power, and be rendered undrivable. On the other hand if we have something like a Datsun 1600, and we take the exhaust off all together, the car will seem to go better, but the majority of the improvement will be noise value only.

All engines require a certain amount of backpressure, to ensure that the cylinders are well scavenged of waste gases. The higher the output of the engine, the larger the diameter of the exhaust required. Performance can be increased by installing a larger diameter exhaust system to a vehicle, but at some point (depending on the engine) diameter choice that is too large will have an adverse effect.

Many newer vehicles like the Gen III VT SS have a self-diagnosing/ learning capable computer. If, for example, the standard exhaust system is removed, and replace with a larger flowing exhaust, the computer management will re- learn the fuel parameters (Short Term and Tong Term fuel trim STFT and LTFT) to compensate for the change, which usually results in the engines power being reverted to almost standard, unless the PCM is re-mapped.

Cracked Exhaust Manifolds

Cracked RH exhaust manifolds (mild steel) are common in VN in VP V8's. They crack around the "hat" where the 4 primary engine pipes join (pictured below right). We can repair these, either on a change over basis, or we can do yours.

Cracked LH exhaust manifolds (cast iron) are common on VP and VR V6's (pictured below left). They can be repaired, but success is usually minimal. We sell new ones rather than repairing them!
Phoenix Mechanical
Soaring