my local shop has specced out a cam for my ls3 at

216/229 561/562 113lobe

He says this will work best on the l92 heads since the intake flows so much better than the exhaust with stock porting. He is also suggesting Com Cams 921 double springs and hardened pushrods......

goal is fairly good idle broad power band 1700-6800 daily drive type cam in 2010 camaro

 

921 springs for what? That's way overkill, you can get the behive springs instead. Hell, the stock springs might even be fine.

 

Its going in a 10 Camaro? Are you running the stock exhaust manifolds? The cam he stated is a mild grind, but what experience does he have with these heads. I agree if it was my car I would change the springs and pushrods. The 921's might be a bit much

 

The ls3 cam was incredibly good. I have actually been working on a performance ls3 cam and couldn't get more than 14 hp out of the top end. If you open up the headers I am sure you can get more. The factory ls3 cam is 117.5 lsa the motor tends to like higher lsa's.

You will want to upgrade springs since they are good to just about 15 mm of lift with rocker tip travel from edge to edge of valve and 6800 rpm is really pushing the stock springs in the motor. I wouldn't expect to big of a power jump though.

If you did headers and cam and srpings maybe 30-40 at flywheel? really depends on a how everything matches kind of curious as to the power levels you notice.

 

I see you're still waiting for an expert...

 

GMPP LS3 engine - 430 HP
GMPP LS3/480 - hot cam - 480 HP
GMPP LS3/515 - (carb and carb intake) asa cam - 515 HP

please tell me where you get your figures for 30-40 at the crank with cam AND headers.....

misinformation is not good

 

http://www.livernoismotorsports.com/...3%3A+Camshafts

 

I amworking on a project for the ls3 right now. It was an assumption based on what I have seen with cam changes alone thats why I said I would like to see.

He already said 1700-6800. The ls3 base redlines at 6600 and starts dropping power after 6000. Like I said the cam in there is one of the best cams you can get for what the engine is it has a great bottom end. Especially if you want to keep a stout bottom end for dd.
Stock specs are 204/211 @.05 .551/.525 117.

The GMPP cam claims to make 50 hp more the dyno shows it. I am interested in seeing what you think. The power curve is really good on that cam. Yours is similiar specs. I just find it hard to believe it makes that much more power. It would be plausible with different ramp rates, will lead to higher stress on the stock valvetrain though.

The cam you got though sounds like it has some good potential because the motor really like whens the exhaust is pushed out in duration a bit compared to the intake. The shops correct

 

The stock cam is nowhere near the best for the LS3. People are getting 30rwhp with headers and a tune, not even using a cam. You can easily get another 30-40rwhp from a cam on top of that without even harming drivability.

The OPs cam recommendation is rather conservative and would drive like stock. It would pick up some power and would be an improvement, but there's still room to grow on top of that without hurting drivability

 

^^^ IS DILUTED!....PLEASE try not to act/think like he does

 

I am a horrible guy. Please never act like I do or even dare to think my way!!!!

 

Gave him some info on Camaro5 but...

 

We've gotten close to 100 rwhp gains in the LS3 Vettes with headers, mild cam, springs and UD pulley. These are nice sounding and nice driving cams. Good increases in low end, as well as FAT increases up top.

On average we see about 30-40 rwhp gains headers and catted x-pipe and tune.

08 Vette (auto). Headers and tune.


08Vette (6spd). Cam swap. Before numbers were with headers and tune. They typically dyno stock about 375 or so.

 

Sometimes you can talk to you are blue in the face.......

 

I'm hoping that with my fully ported LS3 int, 1 7/8 LTs, TSP CNC LS3 heads and 240/244 608/613 114. From what I've read my cam duration may be high. But for now its in there. Still got to wait 2 weeks or so before I fire it up. Goal is 500whp.
Scoggin, I need to order the cometics .030 head gaskets to have my CR 11.1.

 

Maybe on the intake side. We had nice results with 220/244 .614/.648 110 made a little over 500 on a md.

 

I've been reading LS3 cam threads and articles and so far haven't seen anyone stuff a cam into an LS3 and then go hit the track. I've seen some impressive dyno numbers posted but where are track times to show what some of these combos can really do.

I'm in the market for an LS3 cam that will not need flycutting, hit some serious numbers with some ported heads from WCCH, and have the potential to run 13x mph traps @ 3100-3200 raceweight.

 

Stock stroke 376 lil head work, behives, spider w/ accufab 4150. 3480lbs

1.50/10.8x @126 thru a t56 on muscle.

 

I find it hard to get 100whp gains with a cam and headers alone unless a major increase was because you underdriving things significantly. Especially an increase in the low end and upper end.

IF this is the case why wouldn't this be a factory option. The majority of your HP increase from a cam that small has to be removing the safety factor in the tune. Such as emission and durability related. Also keep in mind the stock head is 38mm outlet on the exhaust. How could you put 1 7/8 or 2 in headers on and make signifcantly more power?

"On average we see about 30-40 rwhp gains headers and catted x-pipe and tune." Ok what afr are you targeting, what did you do to spark and what emissions have been removed. For every 3 kpa of backpressure it is roughly 1 hp. Stock back pressure is around 54 kpa. So lets say there is absolutely no pressure now you gain 20 hp. Then lets say headers help the scavening affect and minimize flow loss 15. I could believe 30-40 at the wheels with modifying the tune, I still don't see the 100 whp gain. Tunes can increase power like i said because of emissions and other things but each engine off the line is different therefore the stock tunes are somewhat conservative until lately when sensors are sensitive enough to make the tune less conservative and have the computer cut back on things when it notices "potentially" damaging inputs.

50-60whp is reasonable and may not affect driveability. That is an insult to GM to say you can make more power across the whole power range not affect driveability and maintain durability. The LS3 is very new and with it there is much more technology to test the engine. I believe they have more money to test every component and configuration to maximize power and fuel economy while meeting guidlines. That being said no small increase in anything is worth 100whp.

 

We and almost every other shop on the board have built cars and have dyno runs from cars that show differently. You are severely over thinking things. It's well beyond proven that it is not only reasonable, but is fairly common and proven. Gaining close to 100rwhp is not only reasonable, it is proven as well.