chase3

iTrader: (1)

i just built my car not even a year ago but now am going to go with an sts kit. but my cam is on a 112 lsa...sts reccomends nothing below 115..but i have seen people that have my cam with a turbo..didnt really want to open her back up..but will if it will make a huge difference...OPINIONS?? Thanks Chase

pwrtrip75

iTrader: (8)

my 5.3 seems to work ok with a 224/224 .580/.580 112 cam.

DeltaT

iTrader: (5)

You can use it to make plenty of power while you shake the bugs out and get used to the setup, then decide to upgrade if you want.

Jim

engineermike

It's not about LSA, it's about overlap. And even then, none of the "experts" will pin down a good number for overlap.

BLOWNBLUEZ06

iTrader: (17)

LSA is one of the factors that determines overlap, so it is about LSA. Take any given cam and raise the LSA and watch the overlap go away. Maybe a matter of perspective.

dreamls1

iTrader: (25)

i have a 111lsa and it rocks!! spools fast and makes close to 700whp on stock block!

JonCR96Z

iTrader: (33)

I think his point that you can have 112 LSA and not even have overlap depending on duration. It's more abut the overall specs and not just one of them. So saying that one LSA is right or wrong is dumb, not saying that towards you. Kind of like the guys on youtube that say they can tell that the LSA is by hearing the car.

383lt1impala

iTrader: (33)

I plan to run the ms4 with 112 lsa it will help to bleed some boost since im at 12.56 compression.

TURBO6.0L

iTrader: (1)

112 LSA It is not ideal but should work OK. There are lots of people out there with bigger cams on same LSA making good numbers. If you don't like it after you install the kit swap to something else. You probably will need to get your tune fixed if you do change cams. Something to consider unless you tune yourself.

engineermike

Yes, but the LSA alone isn't enough info to figure out the overlap, which is the real issue. Overlap is a function of LSA, intake duration, and exhaust duration. To say that 114 OL is good but 112 OL has too much overlap can't possibly be true. The Buick GN stock cam is on a 106 LSA. Is that bad? You can't tell unless you know the duration. Beyond that, we know that overlap is worse with high backpressure/boost ratio's. But again, nobody knows just what backpressure/boost works with what overlap.

engineermike

I have serious doubts that widening the LSA would gain any power at all. In all likelihood, it will lose power. Either way, the OP would gain much more power by moving the turbo up front or increasing the size than he would by changing the LSA by 2 deg. If you're trying to optimize the combo, why not go after the low-hanging fruit?

bcbosley

iTrader: (2)

I made 500 rwhp with a 231/237 112 cam and only 6lbs of boost. Thats with stock heads, stock intake, stock bottom end. Seems to work fine for me.

ace_xp2

What size turbo were you running bc?
It would be nice to get an idea of how much overlap vs. backpressure a person could get away with.

It seems that some are managing to make more power with a little overlap, even though they're running backpressure in the 1.5 up range.

fknsmshn

iTrader: (1)

Im surprised no one has even bothered to ask what your power goal is.

JUNK

Setting a power goal would do nothing....it's more about total overlap/total boost he wants to see. More overlap= more wasted boost. U can have a low-duration cam on a 106 and still have negative overlap. Go for the low-hanging fruit!

TurboBandit

'nuff said... overlap has to do with duration. SMall bit of LSA.

tahoeryan

iTrader: (2)

I don't know if it helps you or not but my cam specs are 232/240@ .050 595/608 lift 115 LSA. 9.5-1 CR, lopey and works good!!

Ryan

fknsmshn

iTrader: (1)

Your jokin right?

Why should he be worried about the LSA of his cam if hes only aimin at, say, 500 horse and hes got a system that will support, say, 700 horse? He asked if the cam choice would make a difference. Read the first post. If these are the numbers hes workin with, then clearly a cam change wouldnt make a big enough diff to warrant goin through all that hassle.

The first thing every build needs is a power goal.

chase3

iTrader: (1)

WOW never thought i would get this much info lol....my power goal is mid six hundreds on say 10 psi???? im a pretty noobie to FI..Looks like i will be sticking with the 112 cause i really dont want all that hassle if its not needed. Again thanks for all info and any more would be appreciated Chase

fknsmshn

iTrader: (1)

Don't be so worried about PSI, just make sure the turbo can actually support that ~650 goal efficiently and give it as much boost as it takes to make that power.