Big Bird WS6

iTrader: (9)

ok, i had a shop "design" me a cam for my build. 228/228 on lsa 115

now i just read my new GM high tech. and linginfelter( does alot of boost motors) said the the high lsa is good.

now gm released a boosted v-8 and it lsa is like 120 or 122(dont remember)

question is. is linginfleter right. should i raise the lsa. or hell should i get a new cam? like the ls9 211/230 at lsa 120/122

help me out. thanks

oh and is 228 big for a turbo motor?

MY99TAWS6

iTrader: (3)

I think lingenfelter mainly chooses cams that have a high degree of streetability with basically no lope. Moderate lift also.And not too crazy on the duration.


I run the gt7. Its very similar to a stock z06 cam.

05-07 ZO6 cam 210/230 .561/.557 –120.5 LSA
Lingenfelter GT7 208/230 .554/.546 –121CL

It has not really any lope,seems easy to tune, I went to 1.8 rockers to get more lift as figured it was very mild for a 408. The duration as you can see is a normal split with a pretty big split. I would have thought it would be better to have more exhaust lift but lingenfelter has built some of the fastest turbo cars in the world so good enough for me.

I have no numbers yet to show what the cam and rest of combo is doing, hopefully in a few months.

As said on here before. There are people that believe in all the variations when it comes to turbo cars. Some say reverse split, some normal split. some no split, some higher lsa and some lower. Seems the turbo cars can make power with just about any cam but really we need a lot of dyno testing to really be able to see what works the best. It would be a good article for high tech performance magazine. Test out the splits and lsa and see what effects it has on power and powerband.

ItsNotStock

iTrader: (24)

You want a higher LSA on FI cams so you're not bleeding off boost in between the cam lobes. 115 seems to be common, but 120 seems to mild for a modified engine. Maybe for a stock boosted engine it would be fine. 228 is not big for a 408 at all. And reverse split seems to be the popular choice. It's all about keeping the boost in the cylinders and not wasting it out the exhaust.

98Z28CobraKiller

iTrader: (17)

The split has to do with head design also. A head with a poor exhaust flow will like more exhaust duration. An aftermarket head may not need a split or may actually benefit from a reverse split if the exhaust side is restrictive.

engineermike

This dead horse has been beaten into a pulp resembling spam.

Until someone performs and publishes some dyno testing, there are no concrete answers - only theories and opinions.

Big Bird WS6

iTrader: (9)

well i have a 377ci. and my heads are 225 afr hand ported by tony.

so my little bro has a bolt on car. would it be in my best interest to sell him my 228/228 w/ 115 lsa

and buy a 228/228 w/ 120 or 117 lsa?

also you said no need for the slip with good heads.correct?>

and the new ls9 cam was built around boost. would it be good for modified motor? only difference is i am hoping for the 1000 wheel range.

wonder what LG does?

stumprrp

iTrader: (2)

EPP sells a nice turbo cam that actually has nasty lope to it, i forget the specs but its on a 115.

theres someone with a clip of a maggy car and a z06 cam, its choppy as hell for some reason.

omore001

iTrader: (1)

Here are the EPP forced induction cam specs, I hear nothing but good things about this cam, I'll be using it shortly on my turbo LQ4.

Cam specs are:

Dur @ .050 232 int 240 exh

Lift .595 int .608 exh

Lobe Sep 115.0

Check out the EPP website for sound clips, I love the way this cam sounds and performs.

otherwhitemeat

iTrader: (3)

Dude...everyone, everywhere has an opinion on cams...unless your trying to squeeze every bit out of the motor, it doesn't really matter....just put what you got in the car and it will be fine.......and if it's not good enough, now you got something to compair it to.

ninetres

iTrader: (35)

Everyone has opinions BUT I RAN A VERY SIMILAR CAM on my set-up....then switched back to a previous one I ran. My set-up at the time:

364ci 8.5:1
T76gts at 14psi

The first cam I ran was a 240/236 640/610 on a 114. I had patriot stage 2 or 3s at the time. Boost came on fast and PULLED LIKE A FREIGHT TRAIN up top. I kept hearing/reading about how a small cam will build boost faster and will be more streetable. Soooooo, long story short I made two changes: AFR 225 heads and a 230/228 590/590ish 115 cam. I ran the same ET and MPH (10.20 @ 136ish) and the car felt more lazy in the upper RPM range. I noticed NO faster spool, and the only thing I can say was a little more tame driving around town. But I for one like a lopey cam, and can live with some drivability issues. Anytime I mentioned this "comparo" to any sort of mechanic/tuner they all responded along the lines of, "Duh, of course its gonna pull hared up top with the bigger stick in it!"

I have since switched back to the 240/236 cam and LOVE IT.

Big Bird WS6

iTrader: (9)

well i wont lie. i dont want the lope. so is a 115 pretty lopy?

MY99TAWS6

iTrader: (3)

115 would have a bit of lope. You could bump idle speed to minimize it.
I would just run one, the gt7 or the z06 cam that is close to it and call it a day.
You will have no lope and make fine power. I got my gt7 used. They use that gt7 in most all their turbo bulids even in 408s and think 427s. You can run 1.8 like I do for a bit more lift. I don't think running past 600 lift is good idea. Harder on springs and you will have to change out springs more often. My lift is around 590 with 1.8s. I do have a normal split but again lingenfelter seems to think they work just fine.

As was said though its hard to prove these cam theories unless someone does a bunch of dyno comparisons.

Big Bird WS6

iTrader: (9)

well the ls7 and ls9 cam are about the same execpt the ls9 has higher lsa. by like 1. and i can get a new ls9 cam for like 105 dollars. so maybe i will do that.

sultan(ZR-1)KSA

intresting thred

Shawn @ VA Speed

iTrader: (3)

I always like reading threads about turbo cams.Kinda entertaining.The problems with turbos is that it is easy to make power.The hard parts is making power where you want it.alot of different factors come into designing a turbo cam-engine size,compression,cylinder head flow,what size turbo's,and vehicle use.One thing that most people forget to enter in the calculation is the turbo size.This directly changes exhaust backpressure which greatly affects the camshaft profile.Small cams don't make power-that's funny.
I've seen over 600rwhp with a stock ls1 cam,over 700rwhp with an ls6 cam,we made over 1000rwhp in Kyle's car with a 370 and a 228 cam,Fireball went 8.30's with a mid 240's cam in a 6.0.I made over 2500hp and went over 200mph in the 1/4 with a mid 250's cam in a 436 sbc.
last thing i have is that every combo requires a different cam,there is no one cam fits all combinations.

mike13

iTrader: (27)

I have a question that's a little different, it seems the cams that come in these motors work very well with forced induction would a set of better flowing heads and a stock or nearly stock profile camshaft get you great drivablity and good numbers?

Tom@SpeedInc

iTrader: (5)

We've built quite a few quick turbo LS cars, and none of them had an LSA number 120º+

LSA is just a number, its a product of the valve events.

many other variables too, single 106mm or twin GT35R?

engineermike

Another funny thing is that, if you go back and read Vizard's book, he recommends a "wide LSA". Most people think this means 114 minimum, up to 122. However, he was referring to "wide" in comparison with cams that are optimized for max power NA at 102-106 LSA. He was talking 112-114 LSA. Since we're all fuel injected, we are typically in the 112-114 range anyway, to help the vacuum or PV clearance. Funny how folks cry bloody murder when someone wants to use a 112 in a FI motor. The stock turbo GN's 3.8 cam is on a 106 LSA from the factory...

Mike

Fireball

iTrader: (21)

why can't people just grasp that concept...LSA means absolutely nothing...any respectable cam designer determines desired valve opening and/or closing events correlated with desired duration numbers....once they figure out those numbers, LSA is nothing more than a calculated value, not one that should be "chosen"

sultan(ZR-1)KSA

any anwers on this?