Hondata

- a specific description of the problem
Strange sputtering sound and loss of power around 4000 RPM.

I pulled a couple seconds from the datalog to attach. I can attach the entire 10 minute datalog with multiple occurances if requested.

Thanks!!

Kpro SerialNo=1386
Kmanager version = 1.3.7.0
2002 RSX type-S
Engine: Toda N2 Cams & Valve Springs / Type-R Intake Manifold / Type-R Valve Cover / Hondata Intake Manifold Gasket / E.S. Motor Mount Inserts /Unorthodox Ultra SS Pulleys
Trans: Exedy stage I clutch & flywheel / Quaife L.S.D.
Intake: Injen CAI (Cold Air Intake)
Exhaust: Toda Race Header / Caspers O2 Sim (for rear O2 sensor) / Borla Cat Back exhaust

Not great, but you can listen to the audio that matches up with the datalog.

https://web4.dmacc.edu/Test_Run_Trimmed.mp3

.

Your engine is not making much vacuum and vtec is engaging far too soon and with too little throttle. Under decel you are only pulling 32 inches of vac when it should be 26 or 27.