Quote:
Originally Posted by hapisok
good point.
how much extra HP do you think that is leaving on the table though without porting the runners? i can see it being an easier mod for guys who don't do any head work, a nice simple bolt on. but with head work and port matching...an extra 10-20hp could be expected? ...  |
Traditionally, when porting we want to push in more volume of air and at the same time don't disrupt the velocity. Usually ported IM's alone for a vehicle that can take advantage are worth about 10-15hp on avg and a little more with tuning from what I been seeing in the past. Not sure how my ported IM and tracy's will differ, but as you know the last time I dynoed I had gained 20ft lb of tq and 18hp with 18mm insulator. What really surprise me is that the gain was before we filled the neck on the manifold, screwed up AFR, and timing pulled 11*-12* pass 4500rpm! We know the 25mm insulator is worth about 10-14ft lb of tq and a little less hp. Also keep in mind, my intake manifold is a stg-3 full blown. It's very interesting indeed. I can't wait for the dyno next week with vince with everything running good
