VS cam and boost?

[ellik]

Im going to ask this question here. I have had a bit of a change in heart and will be planning on Tiagos kit next year when I wont have to strain for the money. In the meantime, Im planning on a cam in the next couple of months. Originally I was going to put in the 4x4 Extreme cam and stay NA, but now with turbo in the future, I want to know what your opinions are on the VS cam when used w/ the turbo kit? Other suggestions are appreciated, but I only want to swap cams once, and it has to be something that will run good NA for the next year.

[Tiago]

post the cam specs

[ellik]

206/216 at .050"
Intake Lift .320" (.512" lift at 1.6:1 rocker ratio)
Exhaust Lift .317" (.507" lift at 1.6:1 rocker ratio)
115 Lobe Separation

link to zzp's page on the cam....
http://www.zzperformance.com/zzp/pro...ion_vs_cam.htm

[Tiago]

would work ok.

maybe something with equal duration for both I/E would be a better choice for both aapps.

[ellik]

how about:

210/210
.317/.317
112

or

216/216
.317/.317
111

or would I want to stay down in the 206 range?

[Tiago]

anything 216/216 wth 115?

[ellik]

Could do it as a custom grind what is that big of a lobe separation going to do? What would be your ideal turbo cam? and how would that run NA in the interim?

[serpint]

Or for that matter, how would a

225/230 (or 215/220)
.310/.310
115 lsa

handle boost in your opinion?

I've run these numbers on dyno2k and gotten some very nice theoretical gains n/a, but I don't know anything on the flow numbers on the kit so I can't simulate that.

[Tiago]

turbos like the higher lsa

[serpint]

Originally posted by Tiago:
turbos like the higher lsa

Would you say they like the higher lsa because it helps reduce overlap, thus allowing the turbo to try and cram as much of the a/f mix into the cylinder as possible without it getting out the exhaust valve?

[Tiago]

yes less overlap = good

[serpint]

Tiago, do you have any specs on the flow rates from your kit? For instance, how many cfm the turbo puts out? I'd like to crunch some more numbers tonight to try and find a good mix of numbers for a cam that would work well in both n/a and fi applications since I'm more likely to have the cam I want installed well before I can afford the turbo kit.

[BadAzzRS]

CAM-901 - INTENSE™ Stage 1X Turbo Cam
duration @ .050": 211º/204º
lobe lifts: .323"/.320"
valve lifts with 1.60:1 rocker arms: .516"/.513" lobe separation angle: 116º
intake centerline: 110º

This is for a stock valve train/heads, it is what I am going with.

[FloydSummerOf68]

Why would that cam have so much more intake than exhaust?
I'm by no means an authority on cams, but I though that since the turbo would be forcing in so much air there is less need for intake and you would be more worried about getting it all out?
Hell I don't know...that just makes sense to me.

[Timbo1969]

Originally posted by FloydSummerOf68:
Why would that cam have so much more intake than exhaust?
I'm by no means an authority on cams, but I though that since the turbo would be forcing in so much air there is less need for intake and you would be more worried about getting it all out?
Hell I don't know...that just makes sense to me.

You want to get as much compressed air into the cylinder as possible, thus the extended intake duration, to keep the intake valves open as long as possible. The exhaust is mostly forced out by the intensity of the explosion of the oxygen dense compressed air, thus the velocity is such that the duration doesn't need to be as high on the exhaust side. That's the theory. I hope I explained it better than I think I did.