Hi all,
I have a 98 tahoe with a 5.3 swap. 4l60E trans
Mods are Pacesetter Longtubes, Hot Air intake, No Cats, 3" dual Exhaust back to 2 Thrush Welded mufflers 2.5" out to turndowns.
E Fans, and a local shop put a "Base Tune" in it. Basically he said he upped the enrichment, took out the torque management, governor vats etc.. I dont have a wideband yet so he couldnt do much more he said.
My problem is the truck feels like North Korea under 2k rpms. No power lol. Pulls strong in the mid to upper range. I know headers and a free flowing exhaust will rob some low end power, but it feels excessive.
it wont spin the tires if i floor it from a stop in the rain. it wont spin if I powerbrake it (which I dont like to do but i tried it to confirm the lack of power.)
No CEL light
I get occasional 02 CELS but it seems it is because I have a "sluggish" o2. it cycles fine sometimes, and behind other times.
Here is a copy of my tune.
I havent done any logs with it but I can if it will help diagnose..
no tq mngt 1.3 pe ramp in plus1deg timing no neg no burst knock.hpt