Formulated

iTrader: (16)

Those of you guys with 224 degree cams: what ICL are you running, and where does your engine make peak power? (or just how high do you run it?). I guess what I'm really looking for is a relationship between IVC and the engine speed at peak power.

I just picked up an XER273 cam, it was a good deal. It is a 224 / 230 degree cam on a 114 LSA. According to the cam card, ICL is 112 when installed straight up. I was thinking of putting it in at 108 to get peak power at lower rpm. I have an A4, and I don't really care to rev it to the moon. If I could get peak power before 6000rpm I would be really happy. (though I think the LS1 heads flow well enough that a relatively short intake duration will still peak pretty high).

1989GTA

By advancing the cam some more you also will increase your dynamic compression ratio along with moving the valve events around. Normally Comp Cams comes with 4 degrees advance already built into them. I think you would likely to more harm than good with another 4 degrees advance.

Formulated

iTrader: (16)

If I understand the usual advance math that people talk about, then I think my cam has 2 degrees advance (112 ICL and 114 LSA). I don't really care much about the advance on the cam, it's all relative, and it's just a shaft with lobes on it. I'm more concerned about where IVC should be to keep the peak power engine speed in a reasonable area. With regards to DCR, I'm putting in a cam that has IVC much later than the OEM GM cam, so my DCR will be lower than stock (decreased from where the engine is now). I don't have any problems with the stock cam that I can relate to DCR, so I should be in good shape.

Formulated

iTrader: (16)

TTT... come on guys... you must know what your ICL is!!!

Ryan02SS

iTrader: (3)

TR224 112LSA 108ICL With my Stage II heads it peaks just a tad over 6000 rpms and holds flat to 6400rpms. Peak torque at 4900rpms.

ExceSSive

iTrader: (13)

TR224 113/ICL109 peaks 5850

PREDATOR-Z

You should make your IVC no lower than 42, that is ~6200 rpm peak
I would keep the cam as is with no advance, this way it is more intake biased from TDC and will have a nice carry after peak.

JPH

iTrader: (2)

107 ICL on certain set ups here.

Formulated

iTrader: (16)

Thanks for the information, guys. The more I get the better.

I figures for ICL and IVC are:
112 ICL / 44 IVC (ABDC)
110 ICL / 42 IVC
108 ICL / 40 IVC

The 42 degree suggestion by Predator might be pretty good. The other point I didn't mention is EVO. I don't want it to be any earlier than it has to be, but with a 230 degree exhaust lobe, that may be a bit difficult. with the 110 ICL, EVO will be 53 BBDC. (BTW, these are all 0.050 lift values I'm talking about)