Ok I recently installed my 3" cat back from CM. Since then my Z has issues around 5700rpms+. It feels like a clogged fuel filter. Best way I can explain how it feels. Power comes & goes between 5700-6400rpms. Not a miss. I had spark blowout due to a wide gap a while back. Doesn't feel like that. More like sputtering as power comes & goes over 5700rpms. I waited until I removed all the junk "extra" stuff from the plenum & solved my idle issue before looking into this one. Here are some things I already checked.
no boost leaks
timing set at 20 degrees
new spark plugs (gapped .27-.28 )
wideband shows good air/fuel at that rpm range (11.8 )
base fuel pressure is 37lbs
Also, my car's power seems to fall flat over 6100. It used to pull to 6800 when I first got the JWT 450 set up installed. Now it just falls flat over 6100 rpms. It revs past 6100 but power falls off noticebly. Thanks for any & all help!
no boost leaks
timing set at 20 degrees
new spark plugs (gapped .27-.28 )
wideband shows good air/fuel at that rpm range (11.8 )
base fuel pressure is 37lbs
Also, my car's power seems to fall flat over 6100. It used to pull to 6800 when I first got the JWT 450 set up installed. Now it just falls flat over 6100 rpms. It revs past 6100 but power falls off noticebly. Thanks for any & all help!
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