I have a 96 gsr swapped eg sedan. Running on obd1 p72 ecu.. So the ecu is correct. In the pass, I remember I can rev up to 8000rpm. But lately for some weird reason it cut off at 7200rpm. No CEL, I jumped the 2 prong blue service connector. The cel stays solid the entire time. The only thing that blinks is the SRS light. It blinks continuously until u remove the key.

No air leak, no jumpy idle. Cap and rotor look perfect, oil is fresh and up to level. VTEC kicks in at 4k.

Mods:
Skunk2 IM
Ported stock tb
Generic header 2.5in collector
Magnaflow 2.5in cat converter
2.5in ss exhaust pipe fitted with Vibrant Ultra quiet Resonator and Apexi WS2 2.5in universal muffler.

Stock intake. New filter..

Timing dead on. Car drive and idle normal 850+/-rpm.

I also have a JDM obd1 p72 ecu to tried and same result. Cut off at 7200rpm, hit rev limiter..

Can't figure out what's going on. Since there is no CEL, I have nothing to go by.

Fuel filter is 2 yes old, car driven less then 7000 miles in 2 yrs. Fuel pump is gsr OEM, not civic. Pressure is in line with FSM spec. Already tested pressure.

I don't have an external tach to try but even if the civic tach is off, it shouldn't be off 800rpms.

Any suggestion?

JDM ecu part number is: 37820-p72-003
Usdm ecu part number is: 37820-p72-a01
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How's the compression?

 

I believe, on my 92 gs, stock limit is 7200. You'd need to tune the ecu, or get a chipped ecu so u can tune it. ...

 

I thought fuel cut on a US p72 was 8200?

Your tach is probably off especially if it is cold.