Hey guys,

I just finished building a B16A with JDM 4-1 header, intake, 2.5" exhaust, CTR intake cam, ITR exhaust cam, valve springs, retainers, and adjustable cam gears.

The car drives great until VTEC engages at around 5,000 RPM, at which point the car loses power and studders quite a bit. Then, at 6,000 RPM, the power comes back and pulls well all the way to redline.

Currently, I have Hondata installed, but still using the stock maps for now until I get it tuned at Secret Services.

Base fuel pressure is set at 56 psi (without vacuum), which equates to about 48 psi with vacuum. Running with 38 psi (with vaccum) fuel pressure still ran the same way.

TPS voltage is 0.500 V at closed throttle and 4.35 V at WOT.

Ignition timing is set at 16 BTDC.

I think that this weird behavior in the powerband will disappear once the fuel pressure is adjusted and the new Hondata maps implemented. Does this sound right?

Thanks a lot,