Hey guys i am not very knowledgeable in the area of tuning, but when vtec hits it seems like my a/f is kinda outa wack...what do you think?

 

yeah mine did that too for some reason, no matter how i messed with it , it would lean our then get rich right at vtec, then would level out a few 100 rpms later.


though it seems out of whack, the lean part isnt too lean and its not too rich either, so its not a motor safety issue in my opinion

 

whys it do that though?

 

just curious do u have the gsr style manifold or the itr style?
cause the gsr has 2 stages so it may have something to do with that when the short runners kick in it may sense the extra air or something. not to familiar with aftermarket engine management

 

ITR, its boosted and running hondata s300

 

a lean spike on vtec is normal. you can help it by richening before and right after vtec. its always going to lean out a little though. nothing to worry about. that happens because of the extra sudden gulp or air the engine inhales
you could get that AF more consistent though