My question is that should I get a less aggressive cams (stage 2) should I go all out and get some super aggressive cams (Stage 3) if I retain my stock compression? Will Stage 3 Cams work with 11.3:1 compression well or should I go 12.3:1?

 

You should take the specs of the cams you're considering and run them through a dynamic compression calculator and base your decisions on that and other info. The reason people say that aggressive cams require higher compression is because of compression losses with these cams. The principle specification to consider is ABDC or after bottom dead center, it's unfortunately a spec that's often difficult to locate for some of these cams. The ABDC for the Crower 63403 cams I run is 46 degrees. Using this spec and a static compression of 12.8:1 w/ my setup I end up with a dynamic c/r of 11.43:1.

Here's a link to a calculatricia...

http://www.rbracing-rsr.com/comprAdvHD.htm

Good luck bro.

 

Hi!

About cams, this might seem like a dumb question, but Ive heard that when running say toda b or c's, you dont feel/hear the vtec rollover point as well, as with stock cams.. Is that because of changes in the powerband? Again, might be a dumb q.. just wonderin.

 

Not a dumb q at all. The powerband can be moved higher or lower somewhat by varying valve overlap. As to not hearing the x-over as well w/ more agressive aftermarket cams...I haven't a clue where anyone got that idea. The Toda cam equipped cars I've heard at vtec x-over had a very deep throaty growl and were far more agressive sounding than any stock setup I've heard. This too is the case with my setup and Crower 63403s. Sometimes I punch it past 5.8k just for the sweet sound of it. On the other hand the idea is generally to get as smooth a power curve as possible when tuning so a heavily modded and properly tuned car probably doesn't have as big an "apparent" kick in the seat as say an ITR at x-over. Rather than a dip and a relatively large power spike at x-over like many stock setups my car just continues climbing at about the same rate after x-over.

whew...I talk alot.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TimoneX &raquo;</TD></TR><TR><TD CLASS="quote">

whew...I talk alot. </TD></TR></TABLE>

Quality over quantity.. but your post had both.