Help me understand why I keep getting spec'd such rowdy cams?
11-05-2015, 10:26 AM
#21
Actually, If I recall correctly you have the SNS 2 which has a LSA and advance of 110+3. My cam has a LSA and advance of 113+2. Your cam has twice as much overlap and one more degree of advance. The underlying valve events are quite different as well. It should make more low end and mid range power than my cam from how I've read Martin explaining it.
My car's current drive-ability doesn't bother me at all. I haven't driven a car with a larger cam so I cannot say what would or wouldn't bother me in that regard. I have just read that once you hit 10* of overlap and over 230 intake duration that things start to go down hill pretty quick as far as drive-ability in a street car is concerned. Not knowing the real world difference myself is why I inquired into the professionals.
My car's current drive-ability doesn't bother me at all. I haven't driven a car with a larger cam so I cannot say what would or wouldn't bother me in that regard. I have just read that once you hit 10* of overlap and over 230 intake duration that things start to go down hill pretty quick as far as drive-ability in a street car is concerned. Not knowing the real world difference myself is why I inquired into the professionals.
11-05-2015, 10:35 AM
#22
TECH Addict
Out of those choices, I like the cam motion cam. I think "how a cam sounds" is absolutely irrelevant in comparison to how it performs. Tune it for driveability, then do the idle speed and timing tricks to get the sound you desire.
That cam motion cam probably has good power everywhere, drives like a dream, and has the most stable/quietest valvetrain of all the choices you listed.
That cam motion cam probably has good power everywhere, drives like a dream, and has the most stable/quietest valvetrain of all the choices you listed.
11-05-2015, 10:38 AM
#23
Who tuned your car OP? I see you're in Missouri like me. In the St. Louis area, there isn't any better tuner than Shane Hinds. If you're more toward the Kanas City area, you should look up LSXkilr or Justin (Justune). If you are in the Midwest, I had a local guy tune my car, and he did a hell of a job.
11-05-2015, 11:51 AM
#25
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Also, a cam motion Titan 4 grind might be worth investigating as well. 227/232-113+4.
Honestly, most cams in the high 220's perform very well and will have similar characteristics. That Titan 4 has 3.5 degrees of overlap and would give you a very good blend of power and driveability.
11-05-2015, 11:56 AM
#26
EPS has a cam that is very close to this. LSA might be slightly different. Good lobe design for valve train longevity and power.
Also, a cam motion Titan 4 grind might be worth investigating as well. 227/232-113+4.
Honestly, most cams in the high 220's perform very well and will have similar characteristics. That Titan 4 has 3.5 degrees of overlap and would give you a very good blend of power and driveability.
Also, a cam motion Titan 4 grind might be worth investigating as well. 227/232-113+4.
Honestly, most cams in the high 220's perform very well and will have similar characteristics. That Titan 4 has 3.5 degrees of overlap and would give you a very good blend of power and driveability.
11-05-2015, 01:17 PM
#27
You asked for a broad torque curve, Thats what overlap gets you... midrange torque...
You have an M6... they can typically take more cam than an auto...
You asked for a rowdier idle... ask a cam guy for that... and hes giving you more overlap.
The only way to get overlap in a camshaft is to put more duration on the lobe... thats why its bigger.
12.5 degrees of overlap is not an excessive amount... Any Good tuner should be able to tune that amount as well as they would 5 to 7.
You have an M6... they can typically take more cam than an auto...
You asked for a rowdier idle... ask a cam guy for that... and hes giving you more overlap.
The only way to get overlap in a camshaft is to put more duration on the lobe... thats why its bigger.
12.5 degrees of overlap is not an excessive amount... Any Good tuner should be able to tune that amount as well as they would 5 to 7.
11-05-2015, 02:51 PM
#28
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You want to know what's funny? The "Titan" cam is named after my son, Titan. Back when Cam Motion had that self cam naming contest, I submitted a bunch of different names, and they actually picked quite a few of the ones I came up with. Got me 1/2 price off any cam I want in the future. I haven't cashed in on that deal yet, but may be here soon.
11-05-2015, 03:34 PM
#29
I nicknamed my car "The Mongoose" because the mongoose is a known predator of the cobra. AFR had their heads named that before I named my car that.
11-06-2015, 01:37 PM
#30
11-09-2015, 09:46 AM
#34
Just for the sake of understanding, what role does compression play in the overlap/driveablilty situation? The previous cam was ran with stock 10:1 compression on 853 heads. The new cam is going to be run with 10.8:1 on the 243 heads. I've read that with more compression you can run more overlap but I've not seen either of those numbers quantified.
11-09-2015, 03:34 PM
#35
Added compression can help to mitigate and help offset the affects that additional overlap can cause.
With a longer overlap event, sometimes bottom end and off idle torque production can be affected negatively. With additional cylinder pressure already there with the addition of compression, you can get away with the longer overlap event costing some bottom end power output.
With a longer overlap event, sometimes bottom end and off idle torque production can be affected negatively. With additional cylinder pressure already there with the addition of compression, you can get away with the longer overlap event costing some bottom end power output.