Tried this in FI and didn't really get any responses, so...

Currently running a 222/230 - 581/591 - 115 LSA

Due to difficulties beyond my control (which I won't get into here), I need to replace the installed cam. While the heads are out getting repaired, I've decided to send the maggie in for the upgrade from the 112 to the 122 blower case (the way I had to pulley the 112 to get 10lbs on my setup, I'm really taxing it, and my IAT's go up to 170*).

I'm considering going to a more agressive cam, and looking for suggestions from folks that are running blowers and cams.

Current mods in sig below...

Thanks...

Rick

 

The cam you have is a pretty good grind already, IMHO. Your duration and lift are biased towards the exhaust side, and the wider LSA keeps reversion down. Increasing the duration won't help your top end that much, as your peak HP is going to be limited to how much air the blower case will flow. Increasing the size of the blower case will help a little (less than 10%), but 122 c.i. is still relatively small. Increasing the boost with a smaller pulley will also help your TQ, but at higher RPMs you'll just heat up your A/F mix, and the boost will get bottled up in the plenum.

In short, the bigger cam will give you more power down low, where you don't need it as much (especially on the street), but not help you too much at higher RPMs, which is where you need improvement.

Since you have to order a new cam anyway, I'd get something similar, but slightly bigger --- maybe a 228/236, same lift and LSA.

 

Rick I'm having Mike Norris put the 122 and a cam in my 07. The cam he wants to use is a 222 230-581-592 116. What do you think. Gene

 

Norris knows what he is doing, and his recommended cam is almost identical to Rick's. I'm sure you'll be pleased.

 

Thanks for the comments...

The reason we're going with the bigger blower case...

The 112 maggie system was designed for stock heads/cam/6ltr motor. We went with the bigger heads so we could drop the compression ratio and safely add more boost. Problem with this was, the stock pulley setup was only net'ing 4lbs of boost with the heads (we were shooting for 10). We had the rear pulley's changed to get to where we wanted to go, and ended up at the upper limit of flow for the 112, also causing the IAT's to really soar (170 degree's) due the the high rpms we had to drive the blower to achieve the boost level. The 122 case is for the 7 liter motor, so by upgrading, we should get to the same boost levels, not overtax the blower, and cut the IAT's dramatically.

The cam currently installed is pretty good actually, we were going for power without too much lope. I agree, Norris does know what he's doing. Genes cam spec is the same is mine, with a little more LSA. I was specifically wondering if folks were getting better numbers with a slightly more agressive cam. Mike told me about another cam he's suggesting, but the lift is a little over .600, and I don't want to get into any clearance issues.

I may just stick with the original spec, since no one seems to be coming up with anything better

 

What kind of potential does the magna 122 hold for HP?

 

Unless the cam he is suggesting is so much bigger duration wise, which I doubt a knowledgeable guy like him would try to go with you would be fine with a jump in lift. Duration causes issues with clearance and lift has little to do with it. At peak lift the piston is actually at the bottom of the cylinder. It is the times when during the overlap period (caused by duration and lobe separation) when the piston is near the top and the valves are hung open a bit that the P/V clearance is in jeopardy. You can run .650 lift with 222/230 lobes without issue on a 115 or 116lsa. My recommendation is to stay with the same cam you have in there and increase lift only. There will be little noticed if you go to .630 lift. Lift is free torque but requres beefy dual valve springs.

Good luck with the project and let us know how it goes.

 

I have an almost identical cam sitting in a box, 222/230 .581/.581 on a 114 LSA, will let it go cheap. PM me if you're interested.

 

Lift is free torque but requres beefy dual valve springs.

Duration staying the same, does lift alone have a positive effect on torque?

Scotty

 

I'm happy with my 230/230 114 cam. I don't have cats on the car, so I didn't need the extended exhaust duration. My aftermarket dual exhaust flows quite a bit, especially without cats. Longer exhaust durations are typically crutches for a restrictive system.

I have my idle speed set at 850 right now, it has a nice lope. With proper tuning, there aren't any drivability issues either. It starts up perfectly and can creep in parking lots at low speed without bucking.

I'd consider the 230/230 a "medium" sized cam for an LS2.

 

Been looking at the LG G5X2:

G5X2 232/240 .595/.608 112/114 - I guess you can order it @ 112 or 114 LSA - probably stick to the 114 if I go this way. This is similar to an "alternate grind" that Norris suggested for me. This looks to give enough additional lift and duration to maximize the upgraded blower case.

Also ordering Crane "Racing Gold" roller rockers (144750A-16) and high performance lifters (144535-16), as I'm not leaving anything to chance this time.

I'd discuss what exactly was the problem that caused my meltdown, but I'm going to wait - as the vendor appears to be willing to step up to the plate and make this right (or at least correct the "defect" in thier part). I'm still on the hook for the cam, lifters, rockers and labor on this. I was a HEARTBEAT AWAY from sucking a valve, and folks that know me here KNOW that I would be a helluva lot more angry if I grenaded the bottom end...

Rick

 

Rick, what is your target powerband range? The reason I ask is because I'm already shifting at ~6900 rpm with a 7K limiter with just a 230/230 114 and the small MP112 case. That is on unported stock heads too. This blower/cam would probably pull to 7300 rpm easily, but I don't want to spin my stock bottom end that high. The HP curves are nearly flat at 7K and aren't dropping yet.

With your proposed bigger cam, with higher flowing heads, and a bigger blower case.... are we hitting 7500 rpm shift points? Just something to consider.

If I upgrade to the MP122 case, I'm keeping the same cam. I'd do it mainly just to make more boost with lower IAT's. Just for efficiency. I love how the car is responsive and drivable as it sits right now.

 

Already have the heads - an issue with the valves took out the cam.

We originally projected 600RWHP on my mod combinations. The heads forced us to send the 112 maggie back for a rear pulley swap, as we weren't able to make the 10lbs we were shooting for (which was the reason for the bigger heads - drop compression/raise boost). The downside was, we pushed the limits of the 112, and really raised the IAT's past the diminishing point of returns. So now, with the car down for a few weeks to get the head situation straightened out, I figured it to be a good time to get the blower upgraded.

The cam choice was made for low lope and comfort (and is actually a good cam, power band is very nice), but since the cam got chowed - I was looking for a slightly more aggressive alternative to up the power a little more - being that I should get the flow out of the 122 blower without cooking the IAT's.

How are you running a 7K limiter on stock heads (and stock springs/etc.)? I'd be a little concerned about things coming apart on an stock top/bottom.

I'll probably just end up with the same cam profile I have (since no one seems to be suggesting a better alternative). I was mainly trying to see what others were running, and what kind of numbers they were getting out of them...

Rick

 

I have CompCams 26918 springs and titanium retainers, 7.400" chrome moly pushrods. Just your basic cam swap kit. The lift on the cam is less than 0.600"

 

I am running comp 220-228, 567-571, 114+4 with AFR 205's out of the box on stock LS1 bottom. 606rwhp, 503rwtq. Nice lope on 346ci & centrifical setup. Cam would rev freely to 7k if I would let it. Keep it limited to 6600 & feels like I am short shifting. I know Maggie is different than centrifical, just my $.02 on cam choice. Best of luck.

Scotty

 

Rick instead of the Crane rockers take a look at the Comcam rockers.The 1.75 ratio with your cam would yeild a .609 lift on the exhaust side.

 

I Talk To A Person From Procahrger He Said Can Use A Cam 112 To A 114 Lobe Seperation! Hope That Helps