Bad dyno day...

[redpotatoes]

Went on the dyno (dynapack) yesterday to get my car tuned, ends up at 156hp with 186tq at 7psi. I am missing about 50 hp and tq. Got a T28 setup(will be listing all the mods when I get the real numbers). Car was running like it had a block exhaust line.

Flow was not at all going out correctly. I got a 3" downpipe, 2.5 inch hi flow cat (Magnaflow) with a 2.5" 5zigen fireball catback system. At first we though the restriction could have been caused by the cat-back tip of the exhaust (canister) because it reduce at the end. We unbolted it to see and gain was barely noticeable but some gain. So I have something that blocks the flow between the head and tip of exhaust.

Turbo has been rebuilt, downpipe, elbow and manifold were brand new and nothing was blocking anywhere.

Anyways, at least the car is now tuned to drive around safely.

I replaced the catalytic converter by my 3" test pipe and went for a drive. Not a lot of changes except that I over boosted (warning was set to 10 and hit 12.4psi).

I was told that an indication that I might have solved my issue is that I would see more boost. My tuner retarded the timing so much to prevent any issue until I fix the problem, that could be a factor of why I don't feel that much improvement.

I looked in my catalytic converter and I see light through it, just a small light. Maybe it's solved and I don't know until I get back for more tuning. I don't want to go spend money for nothing on the dyno and end up having the same issue.

Could my 5zigen fireball catback (60.5mm) reduce the power that much since it's was made for N/A and it's not 3"? I am out of ideas and would really appreciate some help.

Here is my complete setup:

KA24DE 1995 (180 on all cylinder)
370cc injectors (Deatsch Werks rebuilt and tested)
N60 Maf
T28 BB (rebuilt)
Bottom mount manifold Unknown Brand with heat wrap
Turbo elbow Unknown Brand
Custom 3" downpipe
Magnaflow Hi-Flow cat 2.5" (during dyno) / 3" testpipe
5 zigen fireball cat back ~2.5" (60.5mm)
Custom 2.5" Intercooler piping
FMIC 28x6x2.5
OEM Nissan gaskets
NTK 02 sensor new
BKR6E spark plugs re gapped (tuner re gapped them)
OEM Fuel filter
Walbro 255 fuel pump
JGS Vacuum block
Greddy BOV type rs
Greddy Profec-b spec II boost controller
S13 ECU
248x248 91 exhaust cams
Unorthodox Pulley
Fidanza flywheel
South Bend clutch stage 2
Optima redtop battery