I don't get all this cam non sense. We are talking about turbo cars, why put a big cam in it? It's a stupid idea unless you are going all out. Putting a cam in just makes the car get worse gas milage, hurts drivability and does very very little for making more HP.

One of the largest benefits of going FI, is big power and drivability. Why ruin it by putting a large cam in? I don't get it and I guess I never will. Everyone just wants to waste their money for a "cool sound".

FWIW, I have the cam in my sig because it came in my car when I bought it. I don't like it one bit. New motor is getting a z06 cam.

 

i must have forgotten to update.

i put in a z06 cam.. the old cam is for sale still, 275 plus ship.

 

thanks for the update so hows the difference?

 

Dave, you should smelt and forge your own cam. Glad to see your new setup last weekend, too bad the roads were congested to see you in serious action against the supra.

 

ddnspider yes plese post your graph! mightymouse how do you like you cam?

 

well is basically like stock so u all know what thats like

 

For drivability I'd consider a 224/224 114-115LSA if you are running good tubular manifolds. A 224/220 on 114LSA would work well too. Keep lift moderate (Maybe XE lobes)

For driveability though you cant beat the 02 LS6 cam and you can find them CHEAP

Springs are working harder under boost especially high boost. I wouldn't go mad with the lift as you'll need to factor that into spring pressures and lifter choice. (huge lift and boost can run into valve control issues)

 

Here is what I have learned. Please feel free to correct me if I am wrong on this.....


I start out with a stock 346 and put a single GT67 on it. 5.5psi I make 430hp and a good 450ish TQ. Great, thats a stock cam for you. Guess what, HP and TQ come up quick and die quick. Thats a stock cam for you again. Add our 226/220 cam and on the same 5.5 psi, I am now at just under 480hp. Biggest difference is the spreed of the TQ graph and the HP graph. You want to talk crazy gains all over, that does it. Boost came in no differently than before, but now I have almost 1000RPM more usable power curve. The power also went all the way out to 6600RPM. Not stopping. 8.5 psi took the car to just under 540HP. Not bad for stock bottom end with stock heads. Just a good cam selection.

Same case with a built motor I did with heads and an LS6 camshaft. Here was my problem. That camshaft makes killer TQ, but left all my HP on the table to go to waste. HP curve flatlines before it should, manifolds glow red, ect. Again, TQ is crazy, but missing everything else. The manifold glowing indicates I did not pay attention to the intake and I put too much on the exhaust. Not good for an all out power house car. There was so much back pressure, I stopped making power. Again, I went with the LS6 because it was cheap and I had an extra one. But now I know. So now I am back to a camshaft change to put this car into the HP goals that I wanted in the first place.

So yes, camshaft is very sensitive on turbos. And I do think that a intake driven side is more important to look for. The exhaust is not all that important, it helps with power band, but it all comes down to pressure and what ratio you are working with. A good header, you can go single pattern, a bad manifold, you should have less exhaust. Its all about RPM range as well. Just pick where you want to be, and go with it.

Rick