first tuning session of new setup
TECH Resident
Joined: Jun 2004
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Originally Posted by Pro Stock John
By reducing cylinder pressure by increasing overlap, is that what you mean?
Its obviously dependant on RPM but a intake valve that closes later than optimum for a given rpm will push air back thru the intake port..
Honestly my favorite method to lower cylinder pressure is to simply drop the static compression ratio...
Originally Posted by V8_DSM_V8again
Well the lSA on that cam helps to make up for less duration and I have been runing that cam on the computer with AFR 225's..
You dont need alot of intake duration with those heads and FI.. There is also the issue of when the valves open and close in relation to the pistons timing as opposed to just total duration.
Its a split with a little more duration on the exhaust side still a smaller cam. I think the exhaust side is just right too.. Not opening to early as to loose some of a turbo engines more degrees of power on the power stroke and hits a pretty good sweet spot on the exhaust valve close point too.
I'm looking for a 6000 rpm hp peak... Actually I concentrated on huge low and mid tq and ended up with a 6000 rpm hp peak...
You dont need alot of intake duration with those heads and FI.. There is also the issue of when the valves open and close in relation to the pistons timing as opposed to just total duration.
Its a split with a little more duration on the exhaust side still a smaller cam. I think the exhaust side is just right too.. Not opening to early as to loose some of a turbo engines more degrees of power on the power stroke and hits a pretty good sweet spot on the exhaust valve close point too.
I'm looking for a 6000 rpm hp peak... Actually I concentrated on huge low and mid tq and ended up with a 6000 rpm hp peak...
TECH Resident
Joined: Jun 2004
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http://www.performancetrends.com/Eng...r_Pro_v3.3.htm
Run higher ratio rockers like 1.8 crane quicklift rockers if you want some more lift...
I doubt he will need it.. AFR has their flowbench data up...
Alot also depends on the shape of the cam lobe.. An agressive profile will hold the valve open higher...
Run higher ratio rockers like 1.8 crane quicklift rockers if you want some more lift...
I doubt he will need it.. AFR has their flowbench data up...
Alot also depends on the shape of the cam lobe.. An agressive profile will hold the valve open higher...
............. Id be happy with just the snow kit for that car so I could give it more timing and boost.
Originally Posted by CP05GMC
Come on Tiago, get yourself a nice little X-mas present and order up the heads/cam/snow kit.
Cp
Cp
Originally Posted by CP05GMC
Come on Tiago, get yourself a nice little X-mas present and order up the heads/cam/snow kit.
Cp
Cp
we'll do something
need to get those vids up
Last edited by Tiago; Dec 14, 2005 at 12:25 PM.
