Summit ls turbo cams?
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From: Ohio, Georgia, Nevada, Texas
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From: Norn Iron
The real stupid is that there is far too much "custom cam" bullshit all over the place these days though.
Except it is stating facts, although his more recent video does address some of the caveats that were not covered in that earlier video where pretty much any cam will work in a turbo.
The real stupid is that there is far too much "custom cam" bullshit all over the place these days though.
https://www.youtube.com/watch?v=mOQ0cHtM2sU
The real stupid is that there is far too much "custom cam" bullshit all over the place these days though.
https://www.youtube.com/watch?v=mOQ0cHtM2sU
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The sky is blue, I stated a fact.....That video stated facts that most people don't wonder. You mean if you add pressure to any NA setup regardless of cam choice it'll make more power? Who would have thought. What he SHOULD have done was stick to 1 setup, same boost, same everything and ONLY swap in different cams (PD blower, NA/centrifugal, turbo, etc.)
Sure, you can make a 800hp with my 78/75 in my 5.3 with a stock cam or a what ever stage else you choose. The spooling and how many psi it takes to make the power at a given RPM are irrelevant though, right? Because if the bigger cam lets more airflow through during its duration then that turbo could have went from making 10psi at 3k rpm with the small cam to making 5psi at 3k rpm with the large cam but the psi is a measure of resistance and since you lowered the resistance with the bigger cam the valve let in more air easier than before and now makes more power at 5psi at 3k rpm than it did with 10psi before with the smaller one.
When it spools, how much psi it delivers are too little of the total equation to make those kinds of assumptions from them.
9 Second Club
Joined: Nov 2003
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From: Norn Iron
Just because the video and testing states a reality you didnt want or like...doesnt change that reality
And he's tested pretty much everything you asked, and much much more.
The bottom line and behaviour were still the same
And he's tested pretty much everything you asked, and much much more.
The bottom line and behaviour were still the same
He video there explains it in the same way I was thinking about it when I started this turbo **** and everyone who had credentials told me I was thinking about it all wrong...
Sure, you can make a 800hp with my 78/75 in my 5.3 with a stock cam or a what ever stage else you choose. The spooling and how many psi it takes to make the power at a given RPM are irrelevant though, right? Because if the bigger cam lets more airflow through during its duration then that turbo could have went from making 10psi at 3k rpm with the small cam to making 5psi at 3k rpm with the large cam but the psi is a measure of resistance and since you lowered the resistance with the bigger cam the valve let in more air easier than before and now makes more power at 5psi at 3k rpm than it did with 10psi before with the smaller one.
When it spools, how much psi it delivers are too little of the total equation to make those kinds of assumptions from them.
Sure, you can make a 800hp with my 78/75 in my 5.3 with a stock cam or a what ever stage else you choose. The spooling and how many psi it takes to make the power at a given RPM are irrelevant though, right? Because if the bigger cam lets more airflow through during its duration then that turbo could have went from making 10psi at 3k rpm with the small cam to making 5psi at 3k rpm with the large cam but the psi is a measure of resistance and since you lowered the resistance with the bigger cam the valve let in more air easier than before and now makes more power at 5psi at 3k rpm than it did with 10psi before with the smaller one.
When it spools, how much psi it delivers are too little of the total equation to make those kinds of assumptions from them.
You obviously haven't a clue what I was saying. The video itself was fine, it just tested something that most people already know. NA plus boost equals more power. Please link me to a video where NOTHING ELSE is changed except for multiple cams on the same boosted motor and the same boost. And please don't show me a comparison between an LS9 and a Lil John cam. To my knowledge, I haven't seen him post a video where he compares a turbo cam, a hi po NA cam, and a blower cam.
I think Richard was just trying to show that any cam will “work” but in my opinion, not always ideal. Cams will act different and spook different. But I think he was just trying to show that it would still make boost and make power. Which we know that. But I did ask a while back kinda the same question. I “thought” I needed a “turbo” cam for my turbo setup to work. In my mind, I didn’t really know what to expect. But some of you guys told me just run the cam I already had, so I did. And it did work pretty well.
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From: Norn Iron
I think Richard was just trying to show that any cam will “work” but in my opinion, not always ideal. Cams will act different and spook different. But I think he was just trying to show that it would still make boost and make power. Which we know that. But I did ask a while back kinda the same question. I “thought” I needed a “turbo” cam for my turbo setup to work. In my mind, I didn’t really know what to expect. But some of you guys told me just run the cam I already had, so I did. And it did work pretty well.
That is most definitely NOT true. Valve events still matter, which is the entire point of what that video was missing. Your video you posted proved exactly that valve events DO matter because it impacts part throttle and spool and boost at a given rpm so it's not all BS.
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Besides tq and hp, not sure if Holdener has done any comparisons regarding cam and boost curves? Cam and back pressure curves? A cam intake lobe doesn't have to be perfectly defined for a given bore, stroke, head, intake and rpm when boost is a simple multiplier. I.E. If intake and exhaust events aren't perfect (not achieving max VE NA), the boost **** can compensate. I believe, exhaust lobe events (and LSA) are key to optimizing a given combination/turbo turbine size, housing AR and exhaust bolted to it.
Last edited by tblentrprz; Mar 25, 2020 at 04:20 PM.
