I went to they dyno today, and noticed i am falling off a lot with power when i hit VTEC! My A/F's are decent, but look at that powerband! help! any advice/ideas?

 

We like to refer to that as a "VTEC dip".

..it just needs to be tuned out. Do you have stock cams? If so.. you shouldn't move your VTEC crossover anyway.

4600 looks a bit too low... It can be tuned out. There is a mad ignition and fuel hump right about there in the fuel/ignition maps.. smooth that ---- out and do another run. See if that helps.

..and if oyu have stock cames, put your VTEC crossover back. :P

 

Yeah they're stock GSR's....But the stock X-over is at 4376 RPM? and that bitch bogged pretty bad too....

 

the stock x-over is at 5000 to 5500. no VTEC is set lower than that stock

 

Are you sure? when I load the stockGSR.bin in uberdata, it sets the value at about 4400 RPM. Also, I always thought on the GSR's the Vtec activation point was ~4400 due to the freakish IM's secondary runners that open at 5500?

 

Move vtec up to like 5300, and see what the *** dyno says.

 

*** dyno will be plenty accurate enough. an instant 40 WHP drop is VERY noticable