EFIDynoTuning Forum

04 Mach 1 5 speed Todd Warren custom cams BBK throttle body
Using tuner pro rt switching from stock manifold to LT cat less X pipe Do i need to tune for long tubes? And how? The egos are further back then stock manifolds.
Thank you for any help you can give me
MB

yes you need to kick up the hego delay then use the histogram to dial it in

kick up the CL delay

kick up the o2 sensor duty cycle

then make sure you dont get any cross scavenging with the x. You can tell by the lambses going in far opposite directions while accelerating. If it does then disable hego 2. If it only does it on decel then use LOLOD / FN338 to force open loop on decel.