I am having a idle surge issue. It seems whenever I clutch into neutral and the rpms drop and then they surge up again maybe 200-400 rpms and seem to fluctuate ever so slightly if I'm moving, but once I come to a full stop and when I'm sitting it idles perfectly at 850 rpms. I'm currently tuning...

So I bought a 2012 Civic Si about 9 months ago.(in 2015) I absolutely love the car! However when i bought it, it already had a few modifications. I had no idea what they were at the time, nor did the dealership that sold it to me, other than (it looks like an aftermarket intake)...so whatever...

Just want to share some teaser picture our sponsored Pasmag 2013 Civic SI sedan tuned by Honda project at Montreal Auto show.

I know the K20s were pretty finicky when it came to IAT's and would yank timing out when it even sniffed hot air. Are the K24s the same?

So I just had my car tuned and had an increase of 25% in midrange power but not much top end.. 3hp to be exact. My top hp was only 203.. I've seen post of people getting 225hp with the same bolt ons I have? My tuner said he tried everything under the sun to get the top end up and he couldn't. I...

Thought I would share some results of some initial testing of a Bisimoto prototype header design for the 2012 Honda Civic SI project. This is a baseline dyno sweep test of a brand new factory 2012 Honda Civic Si, at 11 miles on the odometer. This is a testbed in partnership with American...