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Old 12-02-2024, 08:01 AM   #1
Jakepaul94
 
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I need a cam now!

Any input? L99 with Magnuson running 10lbs of boost (Cogged) with ZL1 pump and ADM controller.

I'd love a thumpy radical sounding cam but I realize this isn't really doable with the blower and wanting to stay with a stock converter as well.

I was looking at the BTR or cam Motion stage 2 PDS blower cams.

Anyone else have any input?
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Old 12-02-2024, 11:57 AM   #2
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Quote:
Originally Posted by Jakepaul94 View Post
Any input? L99 with Magnuson running 10lbs of boost (Cogged) with ZL1 pump and ADM controller.

I'd love a thumpy radical sounding cam but I realize this isn't really doable with the blower and wanting to stay with a stock converter as well.

I was looking at the BTR or cam Motion stage 2 PDS blower cams.

Anyone else have any input?
Note, the "lumpiness" of the cam comes from the LSA of it. Most NA'd guys run anywhere from 110-113 LSA, the boosted guys will run LSA's higher, 115-116 I believe. When I called TSP with my cam, they told me that you could put a stage 1, 2, 3 cam beside each other running with the exact same LSA, and you couldn't tell which one was which at idle.The lower LSA cams I was told can run with a centri blower, but not a PD/roots styled blower. I would give Jannetty Racing a call, they really know their boosted stuff.. Good luck. Heck, you can even call BTR, since you are looking at their cams.
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Old 12-02-2024, 04:33 PM   #3
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The short story is PD blower cams usually run an LSA around 115ish, less than that could sacrifice a couple horsepower and give you more lope.

The idea of higher LSA is so there is less overlap, i.e. less fresh air/fuel charge pushing straight to the exhaust at the end of the compression stroke, but Richard Holdener says all cams are for boost and has done a bazillion dyno runs to make his point. I think he is adamant about this because he feels people think they have to have a special cam for boost when they don't. In other words, any cam will work, but one designed for a PD blower will be optimal for your build. Since you are already settled on buying a cam, you should think about one with an LSA around 115ish, but I would hit up Andrew Cammer of GPI. He helps people make these decisions for a living and is quite good.

I run a turbo cam with 122+4 degree LSA and it sounds pretty radical, so it's doable. My vert has a 115 LSA and has a pretty good lope, but it did have more lope with an ASA cam (110 LSA). The more aggressive the cam, the more radical it will sound even with higher LSA, but do you really want to pick a cam based on the sound it makes or do you want every last horsepower. Your call.

FWIW, the vert is NA and the smoothest driving vehicle I own. People have complemented me on how it sounds, but it is not a quiet car. A lot of the sound aspect comes from the exhaust. The vert has Borla and the turbo car has SLP. The turbo car is pretty loud. You can see my cam specs below.
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Last edited by CamaroCracka; 12-02-2024 at 04:54 PM.
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Old 12-03-2024, 12:59 AM   #4
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Do yourself a favor and watch the below video and see the differences with cams before you make a choice. Brian talks a lot about the PD blower guys. To be easier on your valve train you don't need to go over .600 lift on the exhaust side (the video explains it).

Forced Induction (Part 8): Cam Shaft and Heads Selection with Brian Tooley:

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Old 12-03-2024, 11:15 AM   #5
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Quote:
Originally Posted by CamaroCracka View Post
The short story is PD blower cams usually run an LSA around 115ish, less than that could sacrifice a couple horsepower and give you more lope.

The idea of higher LSA is so there is less overlap, i.e. less fresh air/fuel charge pushing straight to the exhaust at the end of the compression stroke, but Richard Holdener says all cams are for boost and has done a bazillion dyno runs to make his point. I think he is adamant about this because he feels people think they have to have a special cam for boost when they don't. In other words, any cam will work, but one designed for a PD blower will be optimal for your build. Since you are already settled on buying a cam, you should think about one with an LSA around 115ish, but I would hit up Andrew Cammer of GPI. He helps people make these decisions for a living and is quite good.

I run a turbo cam with 122+4 degree LSA and it sounds pretty radical, so it's doable. My vert has a 115 LSA and has a pretty good lope, but it did have more lope with an ASA cam (110 LSA). The more aggressive the cam, the more radical it will sound even with higher LSA, but do you really want to pick a cam based on the sound it makes or do you want every last horsepower. Your call.

FWIW, the vert is NA and the smoothest driving vehicle I own. People have complemented me on how it sounds, but it is not a quiet car. A lot of the sound aspect comes from the exhaust. The vert has Borla and the turbo car has SLP. The turbo car is pretty loud. You can see my cam specs below.
Great info there sir!!
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Old 12-03-2024, 11:16 AM   #6
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Quote:
Originally Posted by racesloth View Post
Do yourself a favor and watch the below video and see the differences with cams before you make a choice. Brian talks a lot about the PD blower guys. To be easier on your valve train you don't need to go over .600 lift on the exhaust side (the video explains it).

Forced Induction (Part 8): Cam Shaft and Heads Selection with Brian Tooley:

Cool and informative vid sir!
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Old 12-12-2024, 02:06 PM   #7
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You guys will have to learn that LSA does not equal overlap. Overlap is what determines the idle characteristics and driveability. Overlap is the result of LSA AND duration. So you can't just make a blanket statement like "A 112 LSA will give you a lumpy idle". You could have a 215/230 112+4 that has negative overlap and idles just about like stock, and then have a 244/268 117+4 that has tones of overlap, and that big aggressive idle everybody loves.

Now, setting LSA and Richard Holdener aside, there are unique airflow demands to various types of power adders. That doesn't mean you HAVE to have a PD cam with a PD blower - it will run and drive with whatever cam is in there, but a camshaft optimized for a specific combination will always perform the best. Generally speaking, PD blowers tend to make strong boost down low and trail off on the top end. So a PD blower cam will typically have mild to moderate amounts of overlap, with a moderate intake duration with a later intake valve close (because we have constant manifold pressure we can continue filling the cylinder later into the compression stroke), and then a generous exhaust duration opening the exhaust valve fairly early to allow ample time to clear the cylinder for the next cycle.

Naturally aspirated, centrifugal supercharger, turbocharging, nitrous, they all have specific things they like as well.

Jakepaul94 - you're right, your stock converter, PD blower setup is not going to end up with a lumpy cam that idles like a sprint car. Mostly because you'd finding driving that around with the stock converter would be miserable. BUT - there are some cam options out there that will give you much more of an aggressive performance idle, provide a well matched increase in power for your PD blower, and still work with your stock converter. Feel free to shoot me an email at andrew@gwatneyperformance.com if I can help get you squared away with what's right for you.
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Old 12-16-2024, 11:45 AM   #8
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Quote:
Originally Posted by Jakepaul94 View Post
Any input? L99 with Magnuson running 10lbs of boost (Cogged) with ZL1 pump and ADM controller.

I'd love a thumpy radical sounding cam but I realize this isn't really doable with the blower and wanting to stay with a stock converter as well.

I was looking at the BTR or cam Motion stage 2 PDS blower cams.

Anyone else have any input?
The JRE rough Idle blower cam fits the bill perfectly.

https://jannettyracing.com/products/...ose-your-grind

https://jannettyracing.com/products/...2015-camaro-ss
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