firechicken2k

Alright.

So, I'm a complete n00b when it comes to this, so feel free to correct me

Am I right from understand that, for instance, 4 degrees timing on a cam will give you more lowend power, but with a tradeoff of sacrificing topend power?

Reason I ask is I am researching cams..
My car is a4, with a 3600 stall. It is a 99% street car, and a 1% drag strip car.


With a 3600 stall, should I even care about the lowend power? I mean, I love going WOT, and stuff. However, in the city (even with my stall) I rarely go 3000 RPMs... unless I'm accelerating from a stoplight and I dont feel like crawling away from it. But would I even see the advantages, if I had a Tr224, or FM11 + 4 degrees?

Or would it be better to have +0 degrees timing on any cam, cause of the stall ?

Feel free to chime in

ArcticZ28

iTrader: (14)

Advancing the timing will increase low end power a bit because it moves the power band down further into the lower RPM range. But, in turn, you will lose top end because it will also taper off sooner up top. As far as the stall, I can't help you out there because I'm an M6 guy and don't know much about that.

firechicken2k

Okay, then my understanding of timing was correct. Cool.

Question about my 3600 stall still remains though.. if timing's even beneficial to me at all, since if I mash the gas I never actually *see) the lowend.. it never shifts below 3600'ish if I'm WOT.

But I'm not WOT all the time.

Patrick G

iTrader: (14)

Your motor will make its best power at a certain intake closing point. Most 346 ci LS1s seem to make best power with an intake valve closing point between 44-46 degrees ABDC. Even 42-43 degrees is good. If your cam seems too small or peaks at too low of an rpm, it's probably because of an early intake valve closing point. If it's too lazy down low but makes gobs of power above 5500 rpm, it may be that the intake closing point is too late.

Bottom line: Find a cam with an intake closing point of 44-46 degrees ABDC (at .050") and you'll be good. FWIW, a stock '02 LS6 cam with only 204 degrees of intake duration has an intake closing point of 43 degrees ABDC. That's why this small cam will rpm so well...it's retarded 2.5 degrees! My small 215 cam closes at 43 degrees. It pulls to 6800 rpm with ease.

firechicken2k

heh, you successfully confused me

my question was whether or not i should care wtf kinda power i got down low, since i have the 3600 stall torque converter..

so.. shall i care about 3000+ rpm power, or shall i still care about power across the board ? i'm not sure.. but it makes most sense to me to only care about 3,000+ rpms, cause of the stall

you tell me..

Texas_WS6

iTrader: (9)

Does anyone know what the IVC position of the MS3 set straight up zerro is?

Also how about his stall question? Mine is a 3800 so I have the same question.

Patrick G

iTrader: (14)

IVC on an MS3 (237/242 113LSA 113ICL) is 51.5 degrees ABDC at .050". Very late in my opinion if you're running it on a 346. I have a feeling that even though the MS3 might be installed dot to dot, it's most likely ground with some advance in it. 4 degrees of advance would give an IVC of 47.5 degrees ADBC...much better for a 346.

To answer the more important question, does any of this matter if you run a 3000+ stall? Yes it does. As I mentioned earlier, your motor will make more power everywhere with the proper valve events. Intake closing point is the most important VE. Having a 3000+ stall eliminates most of the need to have really strong torque below 2000 rpm, so you can get by easier with a later intake valve closing...hence sticking with the 44-46 degree IVC point. But because you have a lockup converter and do 99% of your driving away from the strip, you'll still want some decent throttle response below 3000 rpm. Best way to keep that strong is to not get stupid with duration. Any cam with an intake duration between 224-230 would work well, overlap of -5 degrees to positive 5 degrees (at .050"), and an intake closing point of 44-46 degrees should get you in the money every time.

Texas_WS6

iTrader: (9)

Thanks, they said it has some ground in it. I did not ask how much. They did say not to move it around do to piston to valve clearence. Thanks again.

LS1 BU

iTrader: (13)

Is there a formula to figure out the intake closing or do you just look at the cam card.

Patrick G

iTrader: (14)

There are formulas. For a really cool spreadsheet, do a search for the member J-Rod. He's got a kickass spreadsheet that will nail the valve events every time.