Now every other day i hear threads about cam selection and how high you want to spin the motor etc etc... on the bigger side you have the 847, 306 and le2 etc with many many smaller cams to choose from. I never really hear talk about the rest of the car in relation to choosing a cam. In my own vehicle A4, 3.90, and 3500 this all equates to sitting just bellow my redline for a majority of my 1/4 mile pass.

Does this mean that a 847 is too big for me??

P.S i have no intention of camming my car just yet, im going boost. Just want some discussion on this.

 

Sounds like you need a GM 846 or CC 503 and supporting valvetrain. More cam
than this would be pointless unless you plan on upping your shift points.

 

A good stall goes a LONG ways towards keeping the engine in the powerband with an A4.

The 847 is too big, if you think that duration is a reasonable idea you need to consider how the LT1 intake shifts powerband as compared to a gen 1 intake.

An M6 can have a fair bit more cam surge than an A4 at least you feel it more because the M6 clutch is a more possitive connection than even a locked TC.

 

This thread isent even for me, i just wanted to spur some talk about it. When i do a cam its going to be a boost oriented.

Its my impression that alot of misinformation or very very biased opinions are being passed around here.

For arguments sake, its said that the 847 makes peak power somewhere around 6200 and that you would want to shift around 6600-6700. correct me if im wrong.

With a highly stalled auto, short gearing, and some tuning/dialing in it is ENTIRELY possible to keep the rpms very close to 6k for a majority of the 1/4 mile pass. Right in the "sweet spot" of cams such as the 847/306. And all this without spinning the motor so high your going to loose the bottom end.

The car has SOOO much to do with cam selection and i think that is being neglected on this forum.

 

The cam I have peaks somewhere right around 61-6200 and it is smaller in lift and duration then the 847. Like I said most people especially those with gen 1 experiance underestimate the rpms needed for a cam. The cam manufacturers all understate the necessary rpms as well and my theory is they are applying gen 1 duration=rpm rules to the LT1 again neglecting what our intake does to powerband.

You are right there is a LOT of missinformation and biased opinions, some of the worst offendors of biased opinions are guys defending mistakes they made rather than admittin, learning from and moving on.