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V8 Dump valves (blow off valves)


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1998 Esprit V8. I recently installed a couple of Forge blow off valves (15-23 psi) ,The valves don't vent when revving up the engine.I had already change the springs (rated at 23-30 psi) since nothing was happening. Do I need to disconnect the wastegate valves for the dump valves to work? The engine runs perfectly,no issues with the factory turbos.

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  • 4 weeks later...
On 14/03/2020 at 10:44, v8GTmac1 said:

You need to go lower on spring pressure LoL. 918 is rated at 11 when all is running good. I’m still tuck at 4.7ish


I installed 5 - 11 psi springs and they work beautifully. 

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