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SouthArk370Z · 07-29-2015, 10:14 AM

The loss of power probably has more to do with IAT than coolant temp. The ECM starts pulling ignition timing, &c, at around 90F IAT. IAT is usually a few degrees above ambient when cruising and can be 20F or more higher when sitting at a stop.

My _guess_ is that the changes made to reduce power are causing the change in exhaust sound level. Maybe the exhaust valves are opening sooner/longer to reduce effective compression.

07-29-2015, 10:14 AM	#3 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	The loss of power probably has more to do with IAT than coolant temp. The ECM starts pulling ignition timing, &c, at around 90F IAT. IAT is usually a few degrees above ambient when cruising and can be 20F or more higher when sitting at a stop. My _guess_ is that the changes made to reduce power are causing the change in exhaust sound level. Maybe the exhaust valves are opening sooner/longer to reduce effective compression. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma Last edited by SouthArk370Z; 07-29-2015 at 10:53 AM.