mudflap1989

iTrader: (4)

I have a 03 Z06 that has this cam in it. I've never seen any other cams on here like this on and I would like to get some opinions on it. Im not sure about the advance of the cam or what kind of lobes it has, it was in the car when I bought it. Vaaram, Ported TB, LS6 intake, Kooks 1 3/4" headers, random tech cats, corsa TI race exhaust w/o mufflers and a pulley. It put down 430hp, peaked about 6400 (I think, the dyno chart is in NC, I'm in TX now) but it was low on torque, 382.

What is yall's thoughts on this cam? I am doing major motor work right now included ported LS6 heads and I am wondering if it would be worthwhile to switch to a different cam while I'm in there? I liked the way that it drove before so I kind of think that if it is not broke then dont fix it, do I would like to hear some feedback from some of the experts here.

Thanks

black01_WS6

iTrader: (13)

what do you want from the car. Personally I would probably change it out. You can get a more power and TQ. there is a lot of info on cams on ls1tech, just do a little searching.

Ryan02SS

iTrader: (3)

Give your business to Patrick G on this board. He'll cut you a custom grind matched to the flow of your cylinder heads. Your setup will be maximized in performance potential and you will gain in every category.

Stuffing a large cam like you have in these motors with stock heads will result in a decent topend but a lacking midrange and final torque numbers due to wrong valve events and low DCR.

PREDATOR-Z

What do you mean by major motor work?
If you are rebuilding, then get 2cc valve reliefs in your pistons, mill your ported heads accordingly with porting and stick that **** back in there. That is a good cam, it just needs a little "tweaking"

Patrick G

iTrader: (14)

The low torque is probably a result of too late an intake valve closing point. You could advance the cam 2-4 degrees to pump up dynamic compression, but that's more of a bandaid than anything. Currently, your exhaust has better flow than your intake so you might benefit from a single pattern cam or even a small reverse-split cam with a narrower LSA and appropriate advance to pump up DCR.

Something more like a 236/234 .602/.598 111LSA +4.

PREDATOR-Z

I think that cam would be better on a 111+0 or 111-1, that increases the midrange trq (EVO) and make it more rev capable (more intake biased), therefore less peaky. (cam degreed of course)

But in his post he said he will be porting the heads, so as you said the 235/240 can be tweaked.

Patrick G

iTrader: (14)

Mark (Predator), at +1 or -1, that puts the IVC too late. He's complaining about lackluster torque. He needs to pump up dynamic compression. The proper IVC is going to be more important in this case then where overlap is occuring relative to TDC (in my opinion of course).

PREDATOR-Z

That would be true for standard splits, but IMO in reverse having the EVO a couple *s lower than IVC will " spread" that trq nicely in midrange without taking away from top rpm HP as is common on advanced reverse cams that are on the market.
If it were me installing that cam on stock headed LS6, I would grind it with no advance and "tweak" it via adjustable chain to see what that particular combo likes best.

The difference between his cam and that reverse on a 111 in DCR is only .07, but the reverse will make more trq for sure.
Also he would go from a 9.5* overlap to a 13* overlap which also translates into more HP

looking at the VEs

235/240 114+4

IVO>7.5
IVC>47.5
EVO>58
EVC>2
ECL>118
Overlap>9.5

The 236/234 111+0

IVO>7
IVC>49
EVO>48
EVC>6
ECL>111
Overlap>13

The IVC difference is only 1.5* (no big deal as the intake restricts its effect) but look at the EVO. 10* less and below 50. Which translates into much more trq in midrange on stock cubes VS the 58* of his cam.

That is the way I look at it

That is of course cam only.

mudflap1989

iTrader: (4)

Thanks for all of the input!!!

I will be flycutting my pistons and putting a set a ported LS6 heads on, most likely PRCs of Patriots. I will also have the heads milled to pump up the DCR, probably .030"-.035". I was hoping to pull some #s off of the cam when I get in there and find out some more info on it so that I can calculate DCR appropriately, but with calculating the DCR with "similar" cams, a .035" mill would not put me at too high of a DCR, even if the cam is advanced 4 degrees and I don't want to mill more than .035" for flow and fitment reasons. I know that this is not the best way to calculate my DCR, but it is all that I can do for right now.

So, I plan on getting the DCR right. I just wonder if the cam is actually a poor cam by design, or nor even really poor, but if there is a substantial amount to be gained by doing a swap then I am willing to.

Like I said before I like the way that the car drove and I didn't really feel that it lacked torque down low, maybe it had something to do with the light weight of the Z06? I really don't care if I gain anymore torque down low, I'm more concerned about hp.

So, will I be better off "tweaking" this cam or just starting from scratch and going with a new custom grind?

Thanks

PREDATOR-Z

If you have 400$ to play around, of course a cam tailored especialy to your setup will show gains.

cantdrv65

iTrader: (3)

That torque number is not bad at ALL for a stock headed Z06.....also very good power numbers....

mudflap1989

iTrader: (4)

I do have $400 to spend if it will be worthwhile. I would rather not spend it if it will only gain 2hp, but if it is likely that I could gain 10hp, I probably would swap cams.

Thanks