Done some CAM homework; now need help putting it togther
07-13-2005, 10:08 PM
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Done some CAM homework; now need help putting it togther Here's what I have so far: 2K LS1 w/stock cam and heads, SLP cai & lid, 85mm MAF, 160stat, SLP hf cats and LTs, Loudmouth, and SLP Predator tune. The dyno (Mustang) run with mods but before tune was 308 MP @ 5250/324 MT @ 4500; after the tune it ran 335 MP @ 5500/345 MT @ 4750 (so if you're debating whether to get a tuner, the Predator was well worth it). The power curve seems noticeably higher, but there's still plenty of torque if I give it a little more partial throttle than before. At WOT is screams, and pulls strong all the way to red line, in fact it really starts cranking at about 3-4 grand. It just keeps going and going and going... I can't wait to get it to the track.
OK, If I choose a cam because of the lower min rpm (say 1500) given that the power curve has already bumped up, am I being dumb and mis-matching the cam and tune? Might it be that with the LTs and Loudmouth, that I'm missing some back pressure; I do have high flow cats after the headers... How will the car respond to the new cam given the Predator tune? I want it to still be streetable, but I have the M6, so that makes it a lot easier.
I've been looking at the Crane 216/224 .551/.551, mainly because of 1500 min rpm. I've also been looking at the Comp Cams XR265HR (212/218 .538/.563 115). How do these compare in power curve to something like SLP's 220/220 .5??/.5??; what's the reason for equal duration vs longer exhaust duration for power? Also, given two cams of equal duration and lift, what does a lower or higher LSA do to the power curve? Is it the lower LSA, the rougher the idle and higher the power curve shifts?
One last question (please take stab an any of them...) What's the advantage to adding higher ration rockers if I'm changing the cam anyways. Since the cams are roughly the same price, would it be better to just get a cam with higher lift or do the higher ratio rockers add something else I don't grasp?
Thanks... obviously I've been reading a lot lately, but need help putting it together...
OK, If I choose a cam because of the lower min rpm (say 1500) given that the power curve has already bumped up, am I being dumb and mis-matching the cam and tune? Might it be that with the LTs and Loudmouth, that I'm missing some back pressure; I do have high flow cats after the headers... How will the car respond to the new cam given the Predator tune? I want it to still be streetable, but I have the M6, so that makes it a lot easier.
I've been looking at the Crane 216/224 .551/.551, mainly because of 1500 min rpm. I've also been looking at the Comp Cams XR265HR (212/218 .538/.563 115). How do these compare in power curve to something like SLP's 220/220 .5??/.5??; what's the reason for equal duration vs longer exhaust duration for power? Also, given two cams of equal duration and lift, what does a lower or higher LSA do to the power curve? Is it the lower LSA, the rougher the idle and higher the power curve shifts?
One last question (please take stab an any of them...) What's the advantage to adding higher ration rockers if I'm changing the cam anyways. Since the cams are roughly the same price, would it be better to just get a cam with higher lift or do the higher ratio rockers add something else I don't grasp?
Thanks... obviously I've been reading a lot lately, but need help putting it together...
Last edited by FUN LS1; 07-13-2005 at 10:15 PM.
07-13-2005, 10:30 PM
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Check this cam out.Comp Cams LS1 Camshaft - 218 / 224 .527 / .534 114 LSA 1600-6500 RPM Power Band. Excellent mid-range torque with good top-end power. Computer Tuning Required. Sould be what your looking for very good small cam!