Page 1 of 1

CTSC jumping revs problem on K20Z4 (FN2)

Posted: Mon Nov 09, 2009 2:38 pm
by walter
I've a problem with CTSC on my Euro Civic Type-R K20Z4...

Engine Mods:
Eaton MP62 Supercharger + 3.3" pulley
RC 650cc injectors
Walbro 255lph fuel pump (uncrushed FPR)
Toda race header
Milltek sport stainless steel exhaust
Toda hi-power clutch/flywheel kit
CPL CAI

Using JRSC Civic SI 650cc as a primary calibration, not CTSC calibration, because of unrushed FPR.

Dyno results:
http://nbk.lt/ctr/dyno/P1000807r.jpg
http://nbk.lt/ctr/dyno/P1000808r.jpg

AFR is fine on idle/cruising/wot, checked with wideband AFR meter. My car always idles fine, revs just drop to ~800-900rpm and stay at that numbers. Sometimes I have a problem with jumping revs, it occurs after cruising I switch to mid-gear and press brake pedal, revs drops to ~400-500rpm, then goes to ~1500rpm, then goes down and stabilize at ~800rpm...
I had this problem from beginning, but now it occurs more often, I think because of damp air in autumn.

Possible vacuum leak? Or something else? Calibration?


I've uploaded 3 data logs, here is the time line when problem occurs:
1 datalog: 10:00 to 10:02
2 datalog: 14:30 to 14:35
3 datalog: 7:00 to 7:05

Calibration: FG2/FA5, MAP based, JRSC, 650cc

Thanks