Cal Tonsley
Well-Known Member
Bit of a different query but here goes!
Last piece of my restoration journey for registration is to pass our Department of Transport Roadworthy inspection. One of the tests in this inspection is for maximum exhaust noise, which for my vehicle requires no greater than 96db be emitted at 3300 RPM. I’ve had a preliminary test performed and my car is currently at 96db at about 2800 RPM.
My 410 stroker is running a 3” stainless twin system with dual mufflers, an x pipe and resonators. It’s also running an Edelbrock ProFlo4 EFI - timing specs are 20 degrees initial with advance starting at 1300 RPM and 33 degrees all in at 2800 RPM. Air Fuel Specs are currently Idle 13.4, Cruise 13.9 & ACC 12.8.
I don’t necessarily wish to modify my exhaust system just yet, so, given my ability to digitally alter the “engine tune” I’m interested to hear people’s suggestions for (temporarily) altering the tune of the motor to achieve the quietest possible exhaust. My thought was to maybe advance timing from the fairly conservative 33 total especially given the motor will be under no load during the test. Is this or any other possibilities worth exploring?
Appreciate your advice, thanks.
Last piece of my restoration journey for registration is to pass our Department of Transport Roadworthy inspection. One of the tests in this inspection is for maximum exhaust noise, which for my vehicle requires no greater than 96db be emitted at 3300 RPM. I’ve had a preliminary test performed and my car is currently at 96db at about 2800 RPM.
My 410 stroker is running a 3” stainless twin system with dual mufflers, an x pipe and resonators. It’s also running an Edelbrock ProFlo4 EFI - timing specs are 20 degrees initial with advance starting at 1300 RPM and 33 degrees all in at 2800 RPM. Air Fuel Specs are currently Idle 13.4, Cruise 13.9 & ACC 12.8.
I don’t necessarily wish to modify my exhaust system just yet, so, given my ability to digitally alter the “engine tune” I’m interested to hear people’s suggestions for (temporarily) altering the tune of the motor to achieve the quietest possible exhaust. My thought was to maybe advance timing from the fairly conservative 33 total especially given the motor will be under no load during the test. Is this or any other possibilities worth exploring?
Appreciate your advice, thanks.
Last edited: