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  1. idle surge issue

    Mechanical Problems & Technical Chat
    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...
  2. how to know if used car has been tuned?

    ECU 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...
  3. Pasmag 2013 SI tuned by Honda project

    Just want to share some teaser picture our sponsored Pasmag 2013 Civic SI sedan tuned by Honda project at Montreal Auto show.
  4. To those that have tuned a 9th gen? How sensitive is it to IATs?

    ECU Tuning
    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?
  5. Just tuned

    ECU Tuning
    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...
  6. Dyno video Bisimoto prototype header 2012 SI

    Exhausts and Downpipes
    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...
  7. Whats a good bolt on mod for the Civic SI ?

    Si Only
    With my older Civic, i found Spoon Sports and T1R to be my top favorites for performance. I used some Injen parts in the past, but i ended up selling them within weeks of buying it. What are your favorite aftermarket performance brands?