Cam tuning

[Celica RA45]

ok nim ,on my 3sge the inlet is off and the exhaust is on ,in the idle range ,from 1600 rpm the inlet advances up 18degress and the exhaust starts to advance back 18degress to the off position at about 5400 rpm the exhaust is off ,at 7600 rpm the inlet retards back to 15degress and then at 8000 rpm to 13degress then at 8400 rpm to 11degress .thats my cam movement through the rev ranges all hp and torque is through the inlet ex is only for start up and overlap down low rev range hope this help
ps the inlet moves 400rpm x 3degress only .if you go any more than this the engine pings and its hard to tune as it richens up and leans off if you advance it or retard it to much

[Celica RA45]

also on most twin cams its the inlet that makes the most power ,so just move the inlet about 2 cams degress or 4 crank and see what that does ,but any engine you advance the inlet even in stock form will make it come in earlier and also it will finish earlier as well
so if you had a cam with say starts at 3500 rpm and goes to 7000 rpm ,by advancing it now starts at 3000 and finishes at 6500 rpm so it is a comprimise on what you wont .the exhaust only needs to be moved either way to stop inversion of the intake charge
by having vvti you get the best of both worlds ,you can have a motor where it idles at 750rpm by retarding the exhaust and have torque and power by advancing the inlet as much as it needs within reason