03-13-2011, 10:32 PM | #71 |
Boosted Moderator
|
What we have here is a failure to communicate...
we need to check with some of the more reputable and well known builders and have a few of them offer up some really good info on cam selection, without giving up proprietary info,, and make a sticky in the forced induction page....we have one for catch cans, and other items... ... I learned most of what I know from Corey, my builder, and please forgive me if I got any of it wrong...
__________________
If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley
Horsepower is how fast you hit the wall. Torque is how far you take the wall with you. “If everything seems under control, you're just not going fast enough.” Mario Andretti If you can turn, you ain't going fast enough... |
03-13-2011, 10:34 PM | #72 |
Drives: 2010 2ss/RS 4l80. 2009 2500 HD Join Date: Mar 2009
Location: Mid MO
Posts: 1,826
|
My cam is more oriented to a N/A setup, but I wanted more so I threw on the D1. After the tuning, and making well over 600rwhp. I left things alone. Can I make more power with a "blower" cam? Sure. My current cam makes power up high, and so does the D1.
__________________
Follow along as we build and race this 2010 Camaro!
https://www.facebook.com/pages/FNSS-...75028626000379 FNSS Racing! |
03-13-2011, 10:35 PM | #73 |
Banned
|
Here's the best way to think about this....
Your engine is an air pump....GM did the best job they could to make good power and keep emissions in check. Of course, the supplied power level isn't good enough...so what do we do? Add CAI and cams. Help get more air in the engine, which in turn makes more power. But now for that air pump to work at max output, you now have a restriction in the exhaust. What do we do? Slap headers on....now the air can get out as fast as it gets in! Great for NA, not so much for boost....the OEM backpressure helps make that 9 PSI of boost. Once the air pump becomes more efficient by adding headers, now you're losing boost pressure in the combustion chamber. What do we do then? Slap a pully on the blower to make more boost! Bottom line? WE'RE ALL NUTS! |
03-13-2011, 10:38 PM | #74 | |||
Booooosted.
|
Quote:
Quote:
Quote:
Well, this is another part of this thread. To find out if I want to install it myself. |
|||
03-13-2011, 10:39 PM | #75 | ||
Boosted Moderator
|
Quote:
Quote:
Maybe it's not possible for them to both be closed at the same time, during the exhaust/intake overlap... If it is possible, and this occurs, where is the boost going... Is it due to the scavenge effect of the headers... Thus the larger tubes being better due to less effect secondary to a larger area and thus slower velocities... Or am I thinking wrong here...
__________________
If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley
Horsepower is how fast you hit the wall. Torque is how far you take the wall with you. “If everything seems under control, you're just not going fast enough.” Mario Andretti If you can turn, you ain't going fast enough... |
||
03-13-2011, 10:40 PM | #76 |
Bayoucitymusclecars.com
|
|
03-13-2011, 10:40 PM | #77 |
Drives: 2010 2ss/RS 4l80. 2009 2500 HD Join Date: Mar 2009
Location: Mid MO
Posts: 1,826
|
__________________
Follow along as we build and race this 2010 Camaro!
https://www.facebook.com/pages/FNSS-...75028626000379 FNSS Racing! |
03-13-2011, 10:42 PM | #78 |
Drives: 2010 2ss/RS 4l80. 2009 2500 HD Join Date: Mar 2009
Location: Mid MO
Posts: 1,826
|
We all love the "LOPE"
__________________
Follow along as we build and race this 2010 Camaro!
https://www.facebook.com/pages/FNSS-...75028626000379 FNSS Racing! |
03-13-2011, 10:43 PM | #79 | |
Banned
|
Quote:
Small LSA/duration cams don't hurt you, they work in harmony with the blower's boost. You're losing boost through the headers.....so you're thinking correctly. |
|
03-13-2011, 10:47 PM | #80 |
Banned
|
Just for giggles....this a clip of my NA car with a .571/.590 228/240 on a 113 LSA.
|
03-13-2011, 10:50 PM | #81 | |
Booooosted.
|
Now...... Let me continue my psycosis....... So, wouldn't my smaller primaries be more effective becasue I lose much less boost? I mean up to a certain power anyway. And not anything I will be going for. Not over 600 rwhp. Quote:
|
|
03-13-2011, 10:52 PM | #82 | |
Booooosted.
|
Ok. I get the 'lsa'
But WTF do these mean? I've seen them, but never really knew. Quote:
|
|
03-13-2011, 10:58 PM | #83 |
Banned
|
.571 = Intake valve lift
.590 = Exhaust valve lift 228 = Intake duration 240 = exhaust duration 113 Lobe separation angle LS3 heads flow insanely well on the intake side, so I chose a cam that would help get the "weaker" exhaust side to get the gasses out as fast as they were coming in. |
03-13-2011, 11:04 PM | #84 |
Boosted Moderator
|
I understand one, I found an article, and went and read it...too much to post here, and I'm on my iPad, so it's hard to copy and paste, but I'll do so tomorrow when/if I make it put to the rig... Weather is sketchy...
there are tremendous amounts of variables, exhaust back pressure, cylinder fill efficiency, overlap, duration etc.... In a nut shell, as was just mentioned, it is an air pump, so, let it breath,,, Good flowing exhaust, proper LSA, narrow in the boosted application, limit the duration, and wala, amazing power.... the exhaust can cause back pressure, which you want some, but if it reaches say 10 lbs of resistance, and you are pushing 7 lbs, and there is some overlap, both valves open at the same time, then the air will go to the point of least resistance... In this case the intake side,,,, with exhaust gases... If this is a 30 degree overlap in a 280 degree duration cam, then you end up with roughly a 85 percent efficiency in cylinder filling with fresh air... The same can be said for velocities... Exhaust valves are smaller, and therefore the same volume, or actually more volume has to flow through a smaller are! So velocities are much higher... Leading to back pressure in a restrictive exhaust system... If you free flow the exhaust, and limit the overlap via either duration and/or LSA, then you can achieve higher cylinder filling efficiencies with fresh air... And create more power. Wow, now my head hurts...
__________________
If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley
Horsepower is how fast you hit the wall. Torque is how far you take the wall with you. “If everything seems under control, you're just not going fast enough.” Mario Andretti If you can turn, you ain't going fast enough... |
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Cunningham Motorsports Cam install Packages | Ryne @ CMS | USA - California | 6 | 01-26-2011 12:38 PM |
cam sensor part number needed for LS3 cam swap on L99 | NEGXXIS | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 0 | 12-12-2010 11:21 AM |
Whiteside Customs Maggie 2300 + VVT Cam Project | yyz28 | Forced Induction - V8 | 3 | 10-17-2010 08:46 AM |
ARH Headers & MTI Cam using stock mufflers (LS3) - Help! | TinyToasta | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 16 | 09-19-2010 02:11 PM |
Upgraded your cam in your LS3? What are your specs? Happy? | papabearcamaro | Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons | 4 | 06-26-2010 04:53 PM |