ok so i got a apexi ITC installed in my car but ive never been brave enough to play with it. so can someone explain what this unit does and what are the effects of retarding or advancing the timing. basicly what the hell does this thing do.
Igntion timing basics Hey, advancing ur igntion timing (going from say -15degrees base timing to -18degrees) has a number of effects. You will experience increased power (more noticeable in the bottom end), possibly reduced fuel consumption (slight), more prone to detonation (but, if ur running far from the limits of detonation, this shouldnt be a problem provided u keep ur advance conservative), quicker engine wear (in theory, dont know how long it will reduce engine life, probably not much difference though), and possibly improved throttle response. In my car, it also made the engine have a slight "throbbing" sound whilst under boost. Retarding will give u less power, a "safer" ignition (less prone to detonating), less response and possibly hesitation when going from 0% throttle to more than say 30% throttle, excessive exhaust gas temps (may scorch cat converters and cause them to become excessively restrictive), reduce fuel economy slighty, and may even damage ur oxygen sensors (may change the "shift" point of a narrowband sensor).
Google has the answers.......>> A quick search for Apexi ITC returned 4840 results. Near the top of the list was this one. http://gc.dsm.org/faqs/2gITCinstall.htm
thanx wykked nice find... i did do a search but most sites were just not as good as the one u posted. so im gonna try the ingnition timing the guy posted on the site. 800 rpm: 0 (no adjustment) 2400 rpm: +5 degrees 4000 rpm: +9 degrees 5600 rpm: +5 degrees 7200 rpm: +5 degrees see how i go with it. thanx again
I'd be careful with that thing... unless timing is square on 15degrees and boost is stock, advancing 9degrees at 4000rpm can spell detonation as well as any dictionary.
I agree.......>> Use small increments and I strongly suggest that it be done on a dyno so power, torque, detonation and air/fuel can be monitered.
