Im assuming this is probably dangerous to do, but thought I would ask anyway. I have a stock ls with a gsr tranny and I/H/E, looking for some FREE power cause the car cant get out of its own way and moneys tight. A friend of mine told me I could play around with timing to get some gains, but I dont have adjustable cam gears so I would have to do it by TEETH which definately sounds like a bad idea to me, but wanted to see if anybody has tried this with positive results. I found a thread explaining what various combinations of "retarding this advancing that" would do to a turboed engine, but since im not turboed I dont know any of these would respond the same way but anyway here it is. BTW my pistons are stock ls pistons, so P2V clearence isnt a huge concern.
Advance both cams-more low end
Retard both cams- More top end, less bottom end
Advance intake cam- more mid range and maybe less top end, rougher idle and perhaps a little loss right off idle
Retard exhaust cam- engine usualy not to senstive to this, same affect as the latter but to less of a degree. Sometimes useful for matching cam to header and can sometimes see good gains, not usualy though, sometimes a little more top end
Advance exhaust cam- NA engines usualy not too senstive to this except cam matching to header. Idles smoother, sometimes a little more bottom end. Spools turbo faster and for small highly backpressured turbos can help all around power
Advance intake, retard exhaust- Rougher idle, more midrange, broader powerband, slight loss of off idle power, sometimes can gain top end on corked up head engines, more senstive to exhaust backpressure and header design
Retard intake, advance exhaust- smoother idle, narrower powerband, good trick on turbo engines with big cams, especialy small turbos on big engines with a lot of backpressure. Less senstive to intake and exhasut tuning and backpressure
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