You are thinking a bit backwards. A single pattern cam is not going to work all that great with stock heads, especially if you aren't running a great exhaust. The exhaust ports need all the help they can get with these heads. In fact, stock headed, M6 cars do great with the XE224/236 cam on a 112 lsa. It's kind of an in between cam that has good manners but a wide powerband... although not as flat as the 224/230.

 

Just to verify -
Stock 97 heads with ISKY springs should work fine with a 224/236 - 114 LSA - the LT1 Xtreme nitrous cam?

Thanks
Mike

 

I would go with the 224/236 then. It works excellent in NA form and will be a big benefit on the juice. With an M6 and mild heads this cam is hard to beat. It should be even better in a lighter third gen then it is in a 4th gen. Now the only decision is what LSA

 

the 224/236(112 LSA) wont make more power than the 224/230.. so what is the benefit of having that much exhaust duration? i know the cc306 has a large duration split same as the 224/236 and makes great power but is a much larger cam... actually inspired me to look into the 224/236 but i know the 230/236 makes more power since it has more intake duration. my only concern is would a bigger cam really make that much difference with stock heads as far as et and trap speeds.

 

All things else being equal the 224/236 will make similar peak torque numbers as the 224/230, but it will be at a higher RPM. Because of this it will also make a bit more peak HP. This taller powerband works well with an M6 car which has shorter gearing (the 224/230 runs out of breath as fast as it gains it, not as much of a problem for A4 which likes the area under the curve). He also plans to run nitrous, and the added duration will make a difference on a head that is already running short on the exhaust side. The 230/236 makes more peak power than the 224/236 but loses more on the "bottom end".

 

Out of curiosity, has anyone actually passed emmisions with a 224/230 on a 112LSA. I know it can be done with it ground on a 114LSA.

I'm also considering this cam (112LSA), but would like the ability to pass emmisions with a tune.

Cheers Roman

 

Ok, so once again i change LOL, the 224/236 seems like the cam for me then.. I will only be running a 100 shot if i do, maybe a 125 at most, but this will be to get me into the 11's in the quarter, i want 11's this summer.. and i want 7's in the 1/8th mile!! If i could do this all motor that would be Sweet!!

Anybody have any rwhp numbers or estimate for this cam?
And how bout Trap speeds in the 1/4?

I did a search yesterday and all i came up with was one guy said he his 345rwhp with the 224/230 and stock heads. Any thoughts or opinions about that?

Mike

 

"Now check out this link! It's an XE 224/230, gtp II heads, MAC shorties.
This guy had put down 380rwhp@5700 and 390rwtq from 3500 to 5000 all the way!!
That's fuggin' awesome....
These are the typical dyno numbers w/ this cam btw. Pair it with a 100 shot, and you've got more power you want to handle ever."

That was out of a thread on this cam. If you werent doing this until next winter or fall I could give you some numbers, but I wont be dynoing until probably spiring or summer. Feels and sounds great though.

 

I'm pretty excited about this, I have not heard one negative thing about either the 224/230 or 224/236 cams, everybody that has them says the are the Shiznit.. I'm actually surprised that more people dont have these cams!!

Thanx for all the help and replies guyz!!
Mike

 

ok the 224/236 looks really good, what power loss would be seen if I went with a 114 lobe separation angle instead of a 112?? Would it idle smooth at that angle?

 

That cam should be exactly what you need. You may want to get it on a 112lsa instead of the 114 it's normally advertised at, it should work great NA and will work well for a 100 shot. ET's are dependant on so many things. With nitrous, if you can't get your car into the elevens you definately have some other problems to fix. I hate to say what trap speeds to expect since there are so many variables to deal with. I have seen this cam reach traps just shy of 114-115mph with an M6 and all supporting mods (full length headers, intake, etc.) and good tuning. This should be a good goal to aim for.

That's the torque curve I was talking about, and why I say it is great for an A4. It certainly isn't a very good nitrous cam though. Even with GTP stage II heads the HP peaked rather quickly, nitrous will only increase the pumping losses out of the exhaust side.

 

Actually, this is pretty much the first Ive ever heard of the 224/236. I knew it was out there, but always knew it as a nitrous cam. Ive never heard anyone but the person in this post say that its good at all N/A, but that doesnt mean it is, its just odd that its not in any other posts about either the 224/230 or 230/236, you would think that if it really was a good compromise between the two more people would have it. Theres a few people that have the 224/230, a bunch of people with the 230/236, some with the CC306/CC305, and craploads with the hotcam, Ive never seen a sig with the 224/236. Im not ragging on it, cuz I know nothing about it, but its odd why no one has it N/A. IMHO you will see more power/TQ with the 224/230 than the N2O cam all the way through, flatter torque curve, and when you shoot the juice you wont even notice a difference between the two cams, unless you want absolutely every ounce of ET/trapspeed/RWHP that you can get out of the engine, get the 224/230 because it is a street cam, and it sounds like you probably drive around a lot on the street. And if your goal is 11s, with the right mods you will hit that N/A with good heads that cam and traction. N2O will hit you bottom 11s. Thats my .02

 

It was me who posted this.
I do think that it's the best cam off the shelf. A 230/236 makes about 5 ft/lbs more torque than the 224/230, but loses _tons_ of tq at the bottom. The 224/230 pattern is the upper limit if you consider street manners and it will give you the most balanced engine (ie. the most low end tq/most hp) when matched with a good set of heads.

 

Don't feel like getting into the whole cam profile but even a 306 will make more power on stock heads, don't be stupid go with the 230/236. I spent a few sleepless nights thinking which cam to buy and my options were about the same. Stock heads will hold up fine,the duration is fine it's the lift you need to worry about and since the 230/236 (well 1 of them) has low lift .510 / .520 ona 1.5 rr ratio your not even near turbulence to actually reach the point where the cam is making the motor lose power.

 

Here's the link once again. No comment on this one, check out the dyno graph at the bottom and notice that flat torque curve!

http://www.firebird.ws/performance.htm#

BTW,jonaddis84, happy birthday!